Atmospheric & Environmental Chemistry

The Center for Atmospheric and Environmental Chemistry performs laboratory and field experiments to study the sources, sinks and chemical transformations of gas phase molecules in the Earth’s atmosphere and other environments.  Techniques that we apply include Tunable Infrared Laser Differential Absorption Spectroscopy (TILDAS) using long path length astigmatic multi-pass cells, discharge flow chemical kinetics, the design and application of various mathematical models, and several advanced gas flux measurement techniques (eddy covariance, gradient flux, tracer release and others).  A key research tool for many of our field projects is the Aerodyne Mobile Laboratory which allows us to perform remote field measurements with state of the art laboratory tools.  Our research and development activities are supported by government agencies, private companies and private sector research consortia.

Government sponsors include: the National Aeronautics and Space Administration, the National Oceanic and Atmospheric Administration, the Department of Energy, the National Science Foundation, the Environmental Protection Agency, the Department of Agriculture and the U.S. Geological Survey.

Research & Development Areas

  • Greenhouse Gas Sources and Sinks
  • Aeronomy and Upper Atmospheric Chemistry
  • Atmospheric Oxidative Capacity
  • Urban and Regional Air Pollution
  • Airborne Toxics Fate Analysis
  • Pollutant Emissions Inventories
  • Atmospheric Trace Gas Measurements
  • Motor Vehicle and Aircraft Exhaust Remote Sensing
  • Stratospheric Ozone Depletion
  • Soil and Groundwater Chemical Detection

Personnel

Dr. Mark S. Zahniser
Mark S. Zahniser
Ph.D., Physical Chemistry, University of Pittsburgh

Dr. Zahniser directs the atmospheric and environmental chemistry research at ARI. He has expertise in reaction kinetics and spectroscopy of gas phase molecular species relevant to the atmosphere. He has extensive experience in laboratory rate constant measurements for reactions relevant to upper atmospheric ozone depletion and in the application of infrared tunable laser detection of atmospheric trace gases and measurements of greenhouse gas fluxes.

Dr. David D. Nelson Jr.
David D. Nelson Jr.
Ph.D., Chemical Physics, Harvard University

Dr. Nelson is an expert in molecular spectroscopy, chemical kinetics and the detection of gas phase molecules. He is a co-developer of Aerodyne's quantum cascade laser trace gas monitors and author of the TDLWintel data acquisition and analysis software. His research interests include chemistry related to ozone depletion and global climate change, the study of regional air pollution, the use of isotopes as environmental tracers and the development of increasingly sensitive trace gas monitors. Dr. Nelson is a Fellow of the Optical Society of America.

Dr. Barry McManus, Center for Atmospheric and Environmental Chemistry
Barry J. McManus
Ph.D., Physics, Massachusetts Institute of Technology

Dr. McManus has expertise in optical instrumentation design and applications to atmospheric trace gas measurements. He has extensive experience in field measurements of atmospheric trace gases and leads the ARI programs in methane emissions measurements from man-made sources. His expertise extends to tunable diode laser instrumentation and advanced optical designs for ground-based and aircraft borne trace gas detection systems using the ARI Astigmatic Multipass Absorption Cell, which he co-developed.

Dr. Joanne Shorter, Center for Atmospheric and Environmental Chemistry
Joanne H. Shorter
Ph.D., Physical Chemistry, Massachusetts Institute of Technology

Dr. Shorter's expertise is in the area of molecular spectroscopy and its application to atmospheric trace gas detection. She has extensive experience in the development and deployment of sensitive laser based instruments for a range of applications including atmospheric monitoring, breath analysis for biomarker detection for medical applications, and quantitative molecular spectroscopy.

Scott C. Herndon
Ph. D., Physical Chemistry, University of Colorado

Dr. Herndon is a physical chemist and principal scientist in the Center for Atmospheric and Environmental Chemistry at Aerodyne Research, Inc. Since joining Aerodyne in 1999, his research interests have focused on the development and utilization of laboratory and field trace gas and fine particle instrumentation, together with modeling studies, to characterize and elucidate atmospheric processes relevant to stratospheric ozone depletion, urban and regional air quality and climate change.  He has led over 20 field measurement campaigns to characterize and quantify air pollutant emission sources and map ambient pollution concentrations using suites of advanced, real-time spectroscopic and mass spectrometric instrumentation deployed on the Aerodyne Mobile Laboratory and on a range of research aircraft and ships. Most recently Dr. Herndon has developed an improved dual tracer release ratio method to quantify methane emissions from oil and gas production and transmission facilities and other sources in the US and Mexico. He is the author or co-author of over 50 archival publications addressing atmospheric science and physical chemistry issues.

Michael Agnese
M.S., Mechanical Engineering, Boston University

Mr. Agnese returned to Aerodyne Research in 2011. He has experience in opto-mechanical design, design for high vacuum systems, and vibration simulation and testing. He will be concentrating on development and construction of Quantum Cascade Laser Trace Gas Detector system. Previously he worked in CEPT on the Miniature Internal Combustion Engine program.

Stanley Huang, Center for Atmospheric and Environmental Chemistry
Stanley C. Huang
B.S., Electronics Engineering, Wentworth Institute of Technology

Mr. Huang joined Aerodyne Research as an Assistant Engineer in 2008.  His main responsibilities are the construction, testing and trouble shooting of scientific instruments. He is a key member of the team that produces Aerodyne's Quantum Cascade Laser Trace Detector systems. His interests and training are in the design of electrical and mechanical systems.

Michael Moore
Michael Moore
B. S. Electrical Engineering, University of Massachusetts

Mr. Moore joined Aerodyne Research as an Associate Engineer in 2012.  His background is in electronics technology and applications. He is currently a member of the team that produces Aerodyne's Quantum Cascade Laser Trace Detector systems.  His main responsibilities include the construction, testing, and trouble shooting of its various systems.

Dr. Joseph R. Roscioli
Dr. Joseph R. Roscioli
Ph.D., Physical Chemistry, Yale University

Dr. Roscioli is involved in field studies of atmospheric trace gas concentrations for the Aerodyne Mobile Laboratory, as well as the design and development of trace gas measurement instrumentation.  Previous work has included quantum state-resolved direct absorption spectroscopy and velocity-map imaging of atmospherically-relevant molecules.  Dr. Roscioli has also been involved in the characterization of environmentally-relevant ions and ionic clusters using infrared rare gas predissociation spectroscopy and multi-laser techniques.

Dr. Tara Yacovitch
Tara I. Yacovitch
Ph.D., Physical Chemistry, University of California at Berkeley

Dr. Yacovitch completed her graduate work  under Prof. Daniel Neumark at the University of California, Berkeley. Her graduate projects include the study of several reactive radicals and transition state intermediates using variant of photoelectron spectroscopy. She has collaborated internationally on the IR spectroscopy of small atmospherically-relevant anion clusters using a free-electron laser. Her expertise lies in molecular spectroscopy and high vacuum systems. At Aerodyne Research, Dr. Yacovitch is involved in IR laser instrument designs and applications for field measurements including the Aerodyne Mobile Laboratory programs.

Paula Sar-Kroeung

Mrs. Sar-Kroeung joined Aerodyne in 2014 as a mechanical assembler. She is a graduate from Lowell High School's General Studies program and has been in the manufacturing field for over 10 years as a self-taught soldering specialist, having honed her skills at various ISO certified companies. She is currently a member of the team that produces Aerodyne's Quantum Cascade Laser Trace Detector systems. Her responsibilities include the assembly of the instruments various subsystems.

Dylan Jervis
Ph.D., Physics, University of Toronto

Dylan Jervis is involved in the design and development of trace gas instrumentation at Aerodyne Research.  Dylan did his graduate work in cold atoms physics at the University of Toronto in Joseph Thywissen's lab.  His primary Ph.D. project was to build an apparatus to study the quantum states of nanokelvin clouds of atoms with high resolution spatial imaging. Other projects include developing novel laser cooling techniques for potassium and lithographing a microelectronic chip trap for neutral atoms.

Greg Genecin
Greg Genecin
M. Eng., Engineering, Boston University

Mr. Genecin joined Aerodyne Research Inc. as a Mechanical Engineer in 2015.  He holds a Masters of Engineering from Boston University, where he focused on control theory, and a Bachelor of Arts from Wesleyan University in Art History.  His focus at Aerodyne is developing and constructing the Quantum Cascade Laser Trace Gas Detector systems. 

Shridhar Ambady
B. S., Electrical and Computer Engineering, Worcester Polytechnic Institute (in progress)

Mr. Ambady joined Aerodyne Research as an Instrumentation Engineer in 2015. His background is in communications and embedded systems. He is a member of the team that produces the Quantum Cascade Laser Trace Gas Detector system. His research interests include digital signal processing and computational mathematics. In his spare time, Shrid enjoys performing standup comedy, writing poems and short stories, and studying history.

Conner Daube
Conner Daube
B. A., Chemistry, Clark University

Mr. Daube joined Aerodyne as a Research Associate in 2015.  He graduated with a B.A. in Chemistry from Clark University.  His primary role involves engaging in field studies performing gas phase measurements through the Aerodyne Mobile Laboratory.

Dr. Christoph Dyroff
Christoph Dyroff
Ph.D, Electrical Engineering, University of Karlsruhe

Dr. Dyroff received his Ph.D in Electrical Engineering from the University of Karlsruhe in Germany where he developed laser spectrometers for laboratory and airborne measurements.  Together with Peter Werle and the group of Alan Fried at NCAR he was using the Stark effect to suppress optical interference fringes in formaldehyde measurements.  He also developed a laser spectrometer to measure isotopologues of water vapor on aircraft.  He continued his research at Karlsruhe Institute of Techenology where he built and deployed several laser spectrometers on passenger and research aircraft.

Affiliated Personnel

Dr. Rick Wehr, University of Arizona

Publications

Dynamics of Ammonia Volatilisation Measured by Eddy Covariance During Slurry Spreading in North Italy, Rossana Monica Ferrara, Marco Carozzi, Paul Di Tommasi, David D. Nelson, Gerardo Fratini, Teresa Bertolini, Vincenzo Magliulo, Marco Acutis, Gianfranco Rana, Agriculture, Ecosystems & Environment, 219, 1-13, 2016.

The Development and Evaluation of Airborne in Situ N2O and CH4 Sampling Using a Quantum Cascade Laser Absorption Spectrometer (QCLAS) J. R. Pitt, M. Le Breton, G. Allen, C. J. Percival, M. W. Gallagher, S. J.-B. Bauguitte, S. J. O'Shea, J. B. A. Muller, M. S. Zahniser, J. Pyle, P. I. Palmer, Atmos. Meas. Tech., 9, 63-77, 2016.

Reconciling Divergent Estimates of Oil and Gas Methane Emissions, Daniel Zavala-Araizaa, David R. Lyona, Ramón A. Alvareza, Kenneth J. Davisb, Robert Harrissa, Scott C. Herndon, Anna Kariond, Eric Adam Kortf, Brian K. Lambg, Xin Lanh, Anthony J. Marchesei, Stephen W. Pacalaj, Allen L. Robinsonk, Paul B. Shepsonl, Colm Sweeneyd, Robert Talboth, Amy Townsend-Smallm, Tara I. Yacovitchc, Daniel J. Zimmerlei, Steven P. Hamburg, PNAS, 112, 15597–15602, 2015.

Air Pollutant Mapping with a Mobile Laboratory During
the BEE-TEX Field Study
, Tara I. Yacovitch1, Scott C. Herndon, Joseph R. Roscioli1, Cody Floerchinger,W. Berk Knighton, Charles E. Kolb, Supplementary Issue: Ambient Air Quality (B), Environmental Health Insights, 9, 7-13, 2015.

New Approaches to Measuring Sticky Molecules: Improvement of Instrumental Response Times Using Active Passivation, J. R. Roscioli, M. S. Zahniser, D. D. Nelson, S. C. Herndon, C. E. Kolb, J. Phys. Chem. A, (Web): June 24, 2015.

Seasonal fluxes of carbonyl sulfide in a midlatitude forest, R. Commanea, L. K. Meredith, I. T. Baker, J. A. Berry, J. W. Munger, S. A. Montzka, P. H. Templer, S. M. Juice, M. S. Zahniser, S. C. Wofsy, PNAS, 112, 14162-14167, 2015.

Recent progress in laser-based trace gas instruments: performance and noise analysis, J. B. McManus, M. S. Zahniser, D. D. Nelson, J. H. Shorter, S. C. Herndon, D. Jervis, M. Agnese, R. McGovern, T. I. Yacovitch, J. R.Roscioli, Appl. Phys. B: Lasers Opt., 119, 203-218, 2015.

Methane Emissions from United States Natural Gas Gathering and Processing, A. J. Marchese, T. L. Vaughn, D. J. Zimmerle, D. M. Martinez, L. L. Williams, A. L. Robinson, A. L. Mitchell, R. Subramanian, D. S. Tkacik, J. R. Roscioli, S. C. Herndon, Environ. Sci. Technol., 49, 10718-10727, 2015.

Methane emissions from natural gas infrastructure and use in the urban region of Boston, Massachusetts, K. McKain, A. Down, S. M. Raciti, J. Budney, L. R. Hutyra, C. Floerchinger, S. C. Herndon, T. Nehrkorn, M. S. Zahniser, R. B. Jackson, N. Phillips, S. C. Wofsy PNAS, 112, 1941-1946, 2015.

Meteorology, Air Quality, and Health in London: The ClearfLo Project, S. I. Bohnenstengel, S. E. Belcher, A. Aiken, J. D. Allan, G. Allen, A. Bacak, T. J. Bannan, J. F. Barlow, D. C. S. Beddows, W. J. Bloss, A. M. Booth, C. Chemel, O. Coceal, C. F. Di Marco, M. K. Dubey, K. H. Faloon, Z. L. Fleming, M. Furger, J. K. Gietl, R. R. Graves, D. C. Green, C. S. B. Grimmond, C. H. Halios, J. F. Hamilton, R. M. Harrison, M. R. Heal, D. E. Heard, C. Helfter, S. C. Herndon, R. E. Holmes, J. R. Hopkins, A. M. Jones, F. J. Kelly, S. Kotthaus, B. Langford, J. D. Lee, R. J. Leigh, A. C. Lewis, R. T. Lidster, F. D. Lopez-Hilfiker, J. B. McQuaid, C. Mohr, P. S. Monks, E. Nemitz, N. L. Ng, C. J. Percival, A. S. H. Prévôt, H. M. A. Ricketts, R. Sokhi, D. Stone, J. A. Thornton, A. H. Tremper, A. C. Valach, S. Visser, L. K. Whalley, L. R. Williams, L. Xu, D. E. Young, P. Zotter, Bull. Amer. Meteor. Soc., 96, 779–804, 2015.

Constructing a Spatially Resolved Methane Emission Inventory for the Barnett Shale Region, D. R. Lyon, D. Zavala-Araiza, R. A. Alvarez, R. Harriss, V. Palacios, X. Lan, R. Talbot, T. Lavoie, P. Shepson, T. I. Yacovitch, S. C. Herndon, A. J. Marchese, D. Zimmerle, A. L. Robinson, S. P. Hamburg, Environ. Sci. Technol., 49, 8147–8157, 2015.

Mobile Laboratory Observations of Methane Emissions in the Barnett Shale Region, T. I. Yacovitch, S. C. Herndon, G. Pétron, J. Kofler, D. Lyon, M. S. Zahniser, C. E. Kolb, Environ. Sci. Technol., 49, 7889–7895, 2015.

Airborne Ethane Observations in the Barnett Shale: Quantification of Ethane Flux and Attribution of Methane Emissions, M. L. Smith, E. A. Kort, A. Karion, C. Sweeney, S. C. Herndon, T. I. Yacovitch, Environ. Sci. Technol., 49, 8158–8166, 2015.

Aircraft-Based Estimate of Total Methane Emissions from the Barnett Shale Region, A. Karion, C. Sweeney, E. A. Kort, P. B. Shepson, A. Brewer, M. Cambaliza, S. A. Conley, K. Davis, A. Deng, M. Hardesty, S. C. Herndon, T. Lauvaux, T. Lavoie, D. Lyon, T. Newberger, G. Pétron, C. Rella, M. Smith, S. Wolter, T. I. Yacovitch, P. Tans, Environ. Sci. Technol., 49, 8124–8131, 2015.

Aircraft-Based Measurements of Point Source Methane Emissions in the Barnett Shale Basin, T. N. Lavoie, P. B. Shepson, M. O. L. Cambaliza, B. H. Stirm, A. Karion, C. Sweeney, T. I. Yacovitch, S. C. Herndon, X. Lan, D. Lyon, Environ. Sci. Technol., 49, 7904–7913, 2015.

Atmospheric Emission Characterization of Marcellus Shale Natural Gas Development Sites, J. D. Goetz, C. Floerchinger, E. C. Fortner, J. Wormhoudt, P. Massoli, W. B. Knighton, S. C. Herndon, C. E. Kolb, E. Knipping, S. L. Shaw, P. F. DeCarlo, Environ. Sci. Technol., 49, 7012–7020, 2015.

Vehicle emissions of radical precursors and related species observed in the 2009 SHARP campaign, J. Wormhoudt, E. C. Wood, W. B. Knighton, C. E. Kolb, S. C. Herndon,  E. P. Olague, J. Air Waste Manage. Assoc., 65, 699-706, 2015.

Airborne in situ vertical profiling of HDO/H216O in the subtropical troposphere during the MUSICA remote sensing validation campaign, C. Dyroff, S. Sanati, E. Christner, A. Zahn, M. Balzer, H. Bouquet, J. B. McManus, Y. González-Ramos, M. Schneider, Atmos. Meas. Tech. Discuss., 8, 121–155, 2015.

Design and performance of a dual-laser instrument for multiple isotopologues of carbon dioxide and water, J. B. McManus, D. D. Nelson, M. S. Zahniser, Opt. Express, 23, 6569-6586, 2015.

Intercomparison of fast response commercial gas analysers for nitrous oxide flux measurements under field conditions, Ü. Rannik, S. Haapanala, N. J. Shurpali, I. Mammarella, S. Lind, N. Hyvönen, O. Peltola, M. Zahniser, P. J. Martikainen, T. Vesala, Biogeosciences, 12, 415-431, 2015.

Development and field testing of a rapid and ultra-stable atmospheric carbon dioxide spectrometer,
B. Xiang, D. D. Nelson, J. B. McManus, M. S. Zahniser, R. A. Wehr, S. C. Wofsy, Atmos. Meas. Tech., 7, 4445-4453, 2014.

Feasibility and Potential Utility of Multicomponent Exhaled Breath Analysis for Predicting Development of Radiation Pneumonitis after Stereotactic Ablative Radiotherapy, J. M. Moré, N. C.W. Eclov, M. P. Chung, J. F. Wynne, J. H. Shorter, D. D. Nelson, A. L. Hanlon, R. Burmeister, P. Banos, P. G. Maxim, B. W. Jr Loo, M. Diehn, J. Thorac. Oncol., 9, 957-964, 2014.

Demonstration of an Ethane Spectrometer for Methane Source Identification, T. I. Yacovitch, S. C. Herndon, J. R. Roscioli, C. Floerchinger, R. M. McGovern, M. Agnese, G. Pétron, J. Kofler, C. Sweeney, A. Karion, S. A. Conley, E. A. Kort, L. Nähle, M. Fischer, L. Hildebrandt, J. Koeth, J. B. McManus, D. D. Nelson, M. S. Zahniser, C. E. Kolb, Environ. Sci. Technol., 48, 8028-8034, 2014.

Sources and sinks of carbonyl sulfide in an agricultural field in the Southern Great Plains, K. Maseyk, J. A. Berry, D. Billesbach, J. E. Campbell, M. S. Torn, M. Zahniser, U. Seibt, PNAS, 111, 9064-9069, 2014.

Measurement of a doubly substituted methane isotopologue, 13CH3D, by tunable infrared laser direct absorption spectroscopy, S. Ono, D. T. Wang, D. S. Gruen, B. S. Lollar, M. S. Zahniser, B. J. McManus, D. D. Nelson, Anal. Chem., 86, 6487–6494, 2014.

Greenhouse gas budget (CO2, CH4 and N2O) of intensively managed grassland following restoration, L. Merbold, W. Eugster, J. Stieger, M. Zahniser, D. Nelson, N. Buchmann, Global Change Biol., 20, 1913–1928, 2014.

Simulation of semi-explicit mechanisms of SOA formation from glyoxal in a 3-D model, C. Knote, A. Hodzic, J. L. Jimenez, R. Volkamer, J. J. Orlando, S. Baidar, J. Brioude, J. Fast, D. R. Gentner, A. H. Goldstein, P. L. Hayes, W. B. Knighton, H. Oetjen, A. Setyan, H. Stark, R. Thalman, G. Tyndall, R. Washenfelder, E. Waxman, Q. Zhang, Atmos. Chem. Phys., 14, 6213-6239, 2014.

Evaluation of the airborne quantum cascade laser spectrometer (QCLS) measurements of the carbon and greenhouse gas suite – CO2, CH4, N2O, and CO – during the CalNex and HIPPO campaigns, G. W. Santoni, B. C. Daube, E. A. Kort, R. Jiménez, S. Park, J. V. Pittman, E. Gottlieb, B. Xiang, M. S. Zahniser, D. D. Nelson, J. B. McManus, J. Peischl, T. B. Ryerson, J. S. Holloway, A. E. Andrews, C. Sweeney, B. Hall, E. J. Hintsa, F. L. Moore, J. W. Elkins, D. F. Hurst, B. B. Stephens, J. Bent, and S. C. Wofsy, Atmos. Meas. Tech., 7, 1509-1526, 2014.

Measurement of a doubly substituted methane isotopologue, 13CH3D, by tunable infrared laser direct absorption spectroscopy, S. Ono, D. T. Wang, D. S. Gruen, B. S. Lollar, M. S. Zahniser, B. J. McManus, D. D. Nelson, Anal.Chem, (Web): June 4, 2014.

Intercomparison of field measurements of nitrous acid (HONO) during the SHARP campaign, J. P. Pinto, J. Dibb, B. H. Lee, B. Rappenglück, E. C. Wood, M. Levy, R.-Y. Zhang, B. Lefer, X.-R. Ren, J. Stutz, C. Tsai, L. Ackermann, J. Golovko, S. C. Herndon, M. Oakes, Q.-Y. Meng, J. W. Munger, M. Zahniser,J. Zheng, J. Geophys. Res. Atmos., 119, 5583–5601, DOI: 10.1002/2013JD020287, 2014.

Development of a Spectroscopic Technique for Continuous Online Monitoring of Oxygen and Site-Specific Nitrogen Isotopic Composition of Atmospheric Nitrous Oxide, E. Harris, D. D. Nelson, W. Olszewski, M. Zahniser, K. E. Potter, B. J. McManus, A. Whitehill, R. G. Prinn, S. Ono, Anal. Chem., 86, 1726–1734, 2014.

Urban measurements of atmospheric nitrous acid: A caveat on the interpretation of the HONO photostationary state, B. H. Lee, E. C. Wood, S. C. Herndon, B. L. Lefer, W. T. Luke, W. H. Brune, D. D. Nelson, M. S. Zahniser, J. W. Munger, J. Geophys. Res. Atmos., 118, 12,274–12,281, doi:10.1002/2013JD020341 2013.

Carbonyl sulfide in the planetary boundary layer: Coastal and continental influences, R. Commane, S. C. Herndon, M. S. Zahniser, B. M. Lerner, J. B. McManus, J. W. Munger, D. D. Nelson, S. C. Wofsy, JGR,  Atmos. 118, Issue 14, 8001–8009, DOI:10.1002/jgrd.5058, 2013.

Measurements of methane emissions at natural gas production sites in the United States, D. T. Allen, V. M. Torres, J. Thomas, D. W. Sullivan, M. Harrison, A. Hendler, S. C. Herndon, C. E. Kolb, M. P. Fraser, A. D. Hill, B. K. Lamb, J. Miskimins, R. F. Sawyer, J. H. Seinfeld, PNAS, 110, 17768-17773, 2013.

Contribution of Nitrated Phenols to Wood Burning Brown Carbon Light Absorption in Detling, United Kingdom during Winter Time, C. Mohr, F. D. Lopez-Hilfiker, P. Zotter, A. S. H. Prévôt, L. Xu, N. L. Ng, S. C. Herndon, L. R. Williams, J. P. Franklin, M. S. Zahniser, D. R. Worsnop, W. B. Knighton, A. C. Aiken, K. J. Gorkowski, M. K. Dubey, J. D. Allan, J. A. Thornton, Environ. Sci. Technol., 47, 6316–6324, 2013.

Publications (continued)

Long-term eddy covariance measurements of the isotopic composition of the ecosystem–atmosphere exchange of CO2 in a temperate forest,  R. Wehr, J. W. Munger, D. D. Nelson, J. B. McManus, M. S. Zahniser, S. C. Wofsy, S. R. Saleska, Agric. For. Meteorol., 181, 69-84, 2013.

Online measurements of the emissions of intermediate-volatility and semi-volatile organic compounds from aircraft, E. S. Cross, J. F. Hunter, A. J. Carrasquillo, J. P. Franklin, S. C. Herndon, J. T. Jayne, D. R. Worsnop, R. C. Miake-Lye, and J. H. Kroll, Atmos. Chem. Phys., 13, 7845-7858, 2013.

Towards a stable and absolute atmospheric carbon dioxide instrument using spectroscopic null method, B. Xiang,  D. D. Nelson, J. B. McManus, M. S. Zahniser, S. C. Wofsy, Atmos. Meas. Meas. Tech., 6, 1611-1621, 2013.

Selective measurements of NO, NO2 and NOy in the free troposphere using quantum cascade laser spectroscopy, B. Tuzson, K. Zeyer, M. Steinbacher, J. B. McManus, D. D. Nelson, M. S. Zahniser, L. Emmenegger, Atmos. Meas. Tech. Discuss., 5, 8969–8993, 2012.

Detecting fugitive emissions of 1,3-butadiene and styrene from a petrochemical facility: An application of a mobile laboratory and a modified proton transfer reaction mass spectrometer, W. B. Knighton, S. C. Herndon, E. C. Wood, E. C. Fortner, T. B. Onasch, J. Wormhoudt, C. E. Kolb, B. H. Lee, M. Zavala, L. Molina, M. Jones, Industrial & Engineering Chemistry Research, 51, 12674–12684, 2012.

Direct measurement of volatile organic compound emissions from industrial flares using real-time online techniques: Proton transfer reaction mass spectrometry and tunable infrared laser differential absorption spectroscopy, W. B. Knighton, S. C. Herndon, J. F. Franklin, E. C. Wood, J. Wormhoudt, W. Brooks, E. C. Fortner, D. T. Allen, Industrial & Engineering Chemistry Research, 51, 12674–12684, 2012.

Industrial flare performance at low flow conditions. 1. Study overview, V. M. Torres, S. Herndon, Z. Kodesh, D. T. Allen, Ind. Eng. Chem. Res., 51, 12559-12568, 2012.

Industrial flare performance at low flow conditions. 2. Steam- and air-assisted flares, V. M. Torres, S. Herndon, D. T. Allen, Ind. Eng. Chem. Res., 51, 12569-12576, 2012.

Application of the carbon balance method to flare emissions characteristics, S. C. Herndon, D. D. Nelson, Jr., E. C. Wood, W. B. Knighton, C. E. Kolb, Z. Kodesh, V. M. Torres, D. T. Allen, Ind. Eng. Chem. Res., 51, 12577-12585, 2012.

Emissions of nitrogen oxides from flares operating at low flow conditions, V. M. Torres, S. Herndon, E. Wood, F. M. Al-Fadhli, D. T. Allen, Ind. Eng. Chem. Res., 51, 12600-12605, 2012.

Effective line strengths of trans-nitrous acid near 1275 cm-1 and cis-nitrous acid at 1660 cm-1 , B. H. Lee, E. C. Wood, J. Wormhoudt, J. H. Shorter, M. S. Zahniser, J. W. Munger, J. Quant. Spectrosc. Radiat. Transfer, 113, 1905-1912, 2012.

Mass fluxes and isofluxes of methane (CH4) at a New Hampshire fen measured by a continuous wave quantum cascade laser spectrometer. G. W. Santoni, B. H. Lee, J. P. Goodrich, R. K. Varner, P. M. Crill, J. Barry McManus, D. D. Nelson, M. S. Zahniser, S. C. Wolfsy, JGR 117,  D10301, doi:10.1029/2011JD016960, 15pp., 2012.

Modelled and measured concentrations of peroxy radicals and nitrate radical in the US Gulf Coast region during TexAQS 2006, R. Sommariva, T. S. Bates, D. Bon, D. M. Brookes, J. A. de Gouw, S. C. Herndon, W. C. Kuster, B. M. Lerner, P. S. Monks, H. D. Osthoff, A. E. Parker, J. M. Roberts, S. C. Tucker, C. Warneke, E. J. Williams, M. S. Zahniser, S. S. Brown, J. Atmos. Chem. 68, 331-362, 2012.

Primary and secondary sources of formaldehyde in urban atmospheres: Houston Texas region,  D. D. Parrish, T. B. Ryerson, J. Mellqvist, J. Johansson, A. Fried, D. Richter, J. G. Walega, R. A. Washenfelder, J. A. de Gouw, J. Peischl, K. C. Aikin, S. A. McKeen, G. J. Frost, F. C. Fehsenfeld, S. C. Herndon, Atmos. Chem. Phys. 12, 3273-3288, 2012.

Establishing Policy Relevant Background (PRB) Ozone Concentrations in the United States, E. C. McDonald-Buller, D. T Allen, N. Brown, D. J. Jacob, D. Jaffe, C. E. Kolb, A. S. Lefohn, S. Oltmans, D. D. Parrish, G. Yarwood,  L. Zhang, Environ. Sci. Tech. 45, 9484-9497, 2011.

Measurements of nitrous acid in commercial aircraft exhaust at the alternative aviation fuel experiment, B. H. Lee, G. W. Santoni, E. C. Wood, S. C. Herndon, R. C. Miake-Lye, M. S. Zahniser, S. C. Wofsy, J. W. Munger, Environ. Sci. Tech. 45, 7648-7651, 2011.

Monomer, clusters, liquid: an integrated spectroscopic study of methanol condensation, H. Laksmono, S.Tanimura, H. C. Allen, G. Wilemski, M. S. Zahniser, J. H. Shorter, D. D. Nelson, J. B. McManus, B. E. Wyslouzil, Phys. Chem. Chem. Phys., 13, 5855-5871, 2011.

Measurements of volatile organic compounds at a suburban ground site (T1) in Mexico City during the MILAGRO 2006 campaign: measurement comparison, emission ratios, and source attribution, D. M. Bon, I. M. Ulbrich, J. A. de Gouw, C. Warneke, W. C. Kuster, M. L. Alexander, A. Baker, A. J. Beyersdorf, D. Blake, R. Fall, J. L. Jimenez, S. C. Herndon, L. G. Huey, W. B. Knighton, J. Ortega, S. Springston, O. Vargas, Atmos. Chem. Phys., 11, 2399-2421, 2011.

Ozone production in remote oceanic and industrial areas derived from ship based measurements of peroxy radicals TexAQS 2006, R. Sommariva, S. S. Brown, J. M. Roberts, D. M. Brookes, A. E. Parker, P. S. Monke, T. S. Bates, D. Bon, J. A. De Gouw, G. .J. Frost, J. B. Gilman, P. D. Goldan, S. C. Herndon, W. C. Kuster, B. M. Lerner, H. D. Osthuff, S. C. Tucker, C. Warneke, E. J. Williams, M. S. Zahniser, Atmos. Chem. Phys., 11, 2471-2485, 2011.

Dual quantum cascade laser trace gas instrument with astigmatic Herriott cell at high pass number, J. B. McManus, M. S. Zahniser, D. D. Nelson, Appl. Opt., 50, A74-A84, 2011.

Investigation of the correlation between odd oxygen and secondary organic aerosol in Mexico City and Houston, E. C. Wood, M. R. Canagaratna, S. C. Herndon, T. B. Onasch, C. E. Kolb, D. R. Worsnop, J. H. Kroll, W. B. Knighton, R. Seil, M. Zavala, L. T. Molina, P. F. DeCarlo, J. L. Jimenez, A. J. Weinheimer, D. J. Knapp, B. T. Jobson, J. Stutz, W. C. Kuster, and E. J. Williams, Atmos. Chem. Phys 10, 8947-8968, 2010.

Application of quantum cascade lasers to high-precision atmospheric trace gas measurements, J. B. McManus, M. S. Zahniser, D. D. Nelson Jr., J. H. Shorter, S. Herndon, E. Wood, F. Wehr, Opt. Eng. 49, 111124, 2010.

Gas turbine engine emissions - Part I: Volatile organic compounds and nitrogen oxides, M. T. Timko, S. C. Herndon, E. C. Wood, T. B. Onasch, M. J. Northway, J. T. Jayne, M. R. Canagaratna, R. C. Miake-Lye, W. B. Knighton, J. Eng. Gas Turb. Power, 132, 06154 (14 pages), 2010.

Gas turbine engine emissions - Part II: Chemical properties of particulate matter, M. T. Timko, T. B. Onasch, M. J. Northway, J. T. Jayne, M. R. Canagaratna, S. C. Herndon, E. C. Wood, R. C. Miake-Lye, W. B. Knighton, J. Eng. Gas Turb. Power, 132, 061505 (15 pages), 2010.

Application of positive matrix factorization to on-road measurements for source apportionment of diesel- and gasoline-powered vehicle emissions in Mexico City, D. A. Thornhill, A. E. Williams, T. B. Onasch, E. Wood, S. C. Herndon, C. E. Kolb, W. B. Knighton, M. Zavala, L. T. Molina, L. C. Marr, Atmos. Chem. Phys. 10, 3629-3644, 2010.

Characterizing a quantum cascade tunable infrared laser differential absorption spectrometer (QC-TILDAS) for measurements of atmospheric ammonia, R. A. Ellis, J. G. Murphy, E. Pattey, R. van Haarlem, J. M. O'Brien, S. C. Herndon, Atmos. Meas. Tech. 3, 397-406, 2010.

Multicomponent breath analysis with infrared absorption using room-temperature quantum cascade lasers, J. H. Shorter, D. D. Nelson, J. Barry McManus, M. S. Zahniser, D. K. Milton, IEEE Sensors J., 10, 76-84, 2010.

Quantum cascade lasers in chemical physics, R. F. Curl, F. Capasso, C. Gmachl, A. A. Kosterev, B. McManus, R. Lewicki, M. Pusharsky, G. Wysocki, F. K. Tittel, Chem. Phys. Lett. 487, 1-18, 2010.

Long-term continuous sampling of 12CO2, 13CO2 and 12C18O16O in ambient air with a quantum cascade laser spectrometer, J. B. McManus, D. D. Nelson, M. S. Zahniser, Isot. Environ. Health Stu. 46, 49-63, 2010.

Adaptation of a proton transfer reaction mass spectrometer instrument to employ NO+ as reagent ion for the detection of 1,3-butadiene in the ambient atmosphere, W. B. Knighton, E. C. Fortner, S. C. Herndon, E. C. Wood, R. C. Miake-Lye, Rapid Commun. Mass Spectrom., 23, 3301-3308, 2009.

Hit from both sides: tracking industrial and volcanic plumes in Mexico City with surface measurements and OMI SO2 retrievals during the MILAGRO field campaign, B. de Foy, N. A. Krotkov, N. Bei, S. C. Herndon, L. G. Huey, A.-P. Martínez, L. G. Ruiz-Suárez, E. C. Wood, M. Zavala, L. T. Molina, Atmos. Chem. Phys. 9, 9599-9617, 2009.

High precision measurements of atmospheric concentrations and plant exchange rates of carbonyl sulfide using mid-IR quantum cascade laser, K. Stimler, D. Nelson, D. Yakir, Glob. Change Biol. 16, 2496-2503, 2010.

HCN detection with a proton transfer reaction mass spectrometer, W. B. Knighton, E. C. Fortner, A. J. Midley, A. A. Viggiano, S. C. Herndon, E. C. Wood, C. E. Kolb, Int. J. Mass. Spectrom. 283, 112-121, 2009.

Emissions of NOx SO2, CO, and HCHO from commercail marine shipping during Texas Air Quality Study (TEXAQS) 2006, E. J. Williams, B. M. Lerner, P. C. Herndon, M. S. Zahniser, JGR, 114, D21306, doi:10.1029/2009JD012094, 2009.

Measurements of volatile organic compounds during the 2006 TexAQS/GoMACCS campaign: Industrial influences, regional characteristics, and diurnal dependencies of the OH reactivity, J. B. Gilman, W. C. Kuster, P. D. Goldan, S. C. Herndon, M. S. Zahniser, S. C. Tucker, W. A. Brewer, B. M. Lerner, E. J. Williams, R. A. Harley, F. C. Fehsenfeld, C. Warneke, J. A. de Gouw, JGR, 114, D00F06, doi:10.1029/2008JD011525, 2009.

Aircraft hydrocarbon emissions at Oakland International Airport, S. C. Herndon, E. C. Wood, M. J. Northway, R. Miake-Lye, L. Thornhill, A. Beyersdorf, B. E. Anderson, R. Dowlin, W. Dodds, W. B. Knighton, Environ. Sci. Technol., 43, 1730-1736, 2009.

Comparison of emissions from on-road sources using a mobile laboratory under various driving and operational sampling modes, M. Zavala, S. C. Herndon, E. C. Wood, J. T. Jayne, D. D. Nelson, A. M. Trimborn, E. Dunlea, W. B. Knighton, A. Mendoza, D. T. Allen, C. E. Kolb, M. J. Molina, and L. T. Molina, Atmos. Chem. Phys., 9, 1-14, 2009.

ACRP Report 7: Aircraft and Airport-Related Hazardous Air Pollutants: Research Needs and Analysis, E. Wood, S. Herndon, R. C. Miake-Lye, D. Nelson, M. Seeley,  65p. (2008).  Airport Cooperative Research Program, Transportation Research Board, Washington, DC

Correlation of secondary organic aerosol with odd oxygen in Mexico City, S. C. Herndon, T. B. Onasch, E. C. Wood, J. H. Kroll, M. R. Canagaratna, J. T. Jayne, M. A. Zavala, W. B. Knighton, C. Mazzoleni, M. K. Dubey, I. M. Ulbrich, J. L. Jimenez, R. Seila, J. A. de Gouw, B. de Foy, J. Fast, L. T. Molina, C. E. Kolb, doi:10.1029/2008GL034058, 2008.

Spatial and temporal variability of particulate polycyclic aromatic hydrocarbons in Mexico City, D. A. Thornhill, B. de Foy, S. C. Herndon, T. B. Onasch, E. C. Wood, M. Zavala, L. T. Molina, J. S. Gaffney, N. A. Marley, L. C. Marr1, Atmos. Chem. Phys., 8, 3093-3105, 2008.

High precision and continuous field measurements of δ13C and δ18O in carbon dioxide with a cryogen-free QCLAS, B. Tuzson, J. Mohn, M. J. Zeeman, R. A. Werner, W. Eugster, M. S. Zahniser, D. D. Nelson, J. B. McManus, L. Emmenegger, Appl. Phys. B, DOI: 10.1007/s00340-008-3085-4, 2008.

Pulsed quantum cascade laser instrument with compact design for rapid, high sensitivity measurements of trace gases in air, J. B. McManus, J. H. Shorter, D. D. Nelson, M. S. Zahniser, D. E. Glenn, R. M. McGovern, Appl. Phys. B., 92, 387-392, 2008.

Development of negative-ion proton-transfer chemical-ionization mass spectrometry (NI-PT-CIMS) for the measurement of gas-phase organic acids in the atmosphere, P. Veres, J. M. Roberts, C. Warneke, D. Welsh-Bon, M. Zahniser, S. Herndon, R. Fall, J. de Gouw, Int. J. Mass Spectrom., 274, 48-55, 2008.

New method for isotopic ratio measurements of atmospheric carbon dioxide using a 4.3 μm pulsed quantum cascade laser, D. D. Nelson, J. B. McManus, S. C. Herndon, M. S. Zahniser, B. Tuzson, L. Emmenegger, Appl. Phys. B, 90, 301-310, 2008.  Special Issue: 6th International Conference on tunable laser spectroscopy.

Quantum cascade laser based spectrometer for in situ stable carbon dioxide isotope measurements, B. Tuzson, M. J. Zeeman, M. S. Zahniser, L. Emmenegger, Infrared Physics & Technology, 51, (1), 198-206, 2008.

Suitability of quantum cascade laser spectroscopy for CH4 and N2O eddy covariance flux measurements, P. S. Kroon, A. Hensen, H. J. J. Jonker, M. S. Zahniser, W. H. van't Veen, A. T. Vermeulen,  Biogeosciences, 4, Special issue, 715-728, 2007.

Laboratory evaluation of an aldehyde scrubber system specifically for the detection of acrolein, W. B. Knighton, S. C. Herndon, J. H. Shorter, R. C. Miake-Lye, M. S. Zahniser, K. Akiyama, A. Shimono, K. Kitasaka, H. Shimajiri, K. Sugihara, J. Air & Waste Manage. Assoc. 57,, 1370-1378, 2007.

Tunable diode laser absorption spectroscopy study of CH3CH2OD/D2O binary condensation in a supersonic Laval nozzle, S. Tanimura, B. E. Wyslouzil, M. S. Zahniser, J. H. Shorter, D. D. Nelson, J. B. McManus, J. Chem.Phys. 127, 034305 (13), 2007.

Towards realization of reactive gas amount of substance standards through spectroscopic measurements, P. M. Chu, D. D. Nelson, Jr., M. S. Zahniser, J. B. McManus, Q. Shi, J. C. Travis,  IEEE T. Instrum. Meas., 56, 305-308, 2007.

Evaluation of nitrogen dioxide chemiluminescence monitors in a polluted urban environment, E. J. Dunlea, S. C. Herndon, D. D. Nelson, R. M. Volkamer, F. San Martini, P. M. Sheehy, M. S. Zahniser, J. H. Shorter, J. C. Wormhoudt, B. K. Lamb, E. J. Allwine, J. S. Gaffney, N. A. Marley, M. Grutter, C. Marquez, S. Blanco, B. Cardenas, A. Retama, C. R. Ramos Villegas, C. E. Kolb, L. T. Molina1, M. J. Molina,  Atmos. Chem. Phys., 7, 2691–2704, 2007.

Airborne measurements of HCHO and HCOOH during the New England Air Quality Study 2004 using a pulsed quantum cascade laser spectrometer, S.C. Herndon, M.S. Zahniser, D.D. Nelson Jr., J. Shorter, J.B. McManus, R. Jiménez, C. Warneke, J.A. DeGouw, J. Geophys. Res., 112, D10S03, doi:10.1029/2006JD007600, 2007.

Paraxial matrix description of astigmatic and cylindrical mirror resonators with twisted axes for laser spectroscopy, J.B. McManus, Appl. Opt. 46, 472-482, 2007.

Characterization of on-road vehicle emissions in the Mexico City Metropolitan Area using a mobile laboratory in chase and fleet average measurement modes during the MCMA-2003 field campaign, M. Zavala, S.C. Herndon, R.S. Slott, E.J. Dunlea, L.C. Marr, J.H. Shorter, M.S. Zahniser, W.B. Knighton, T.M. Rogers, C.E. Kolb, L.T. Molina, M.J. Molina, Atmos. Chem. Phys., 6, 5129-4142, 2006.

Comparison of cw and pulsed operation with a TE-cooled quantum cascade infrared laser for detection of nitric oxide at 1900cm-1, J.B. McManus, D.D. Nelson, S.C. Herndon, J.H. Shorter, M.S. Zahniser, S. Blaser, L. Hvozdara, A. Muller, M. Giovannini, J. Faist, Appl. Phys B, 85, 235-241, 2006.

Implementation of a Markov Chain Monte Carlo method to inorganic aerosol modeling of observation from the MCMA-2003 campaign - Part I: Model description and application to the La Merced site, F.M. San Martini, E.J. Dunlea, M. Grutter, T.B. Onasch, J.T. Jayne, M.R. Canagaratna, D.R. Worsnop, C.E. Kolb, J.H. Shorter, S.C. Herndon, M.S. Zahniser,  J.M. Ortega,  G.J. McRae, L.T. Molina, M.J. Molina, Atmos. Chem. Phys., 6, 4867-4888, 2006.

Implementation of a Markov Chain Monte Carlo method to inorganic aerosol modeling of observation from the MCMA-2003 campaign - Part II: Model application to the CENICA, Pedregal and Santa Ana sites, F.M. San Martini, E.J. Dunlea, R. Volkamer, T.B. Onasch, J.T. Jayne, M.R. Canagaratna, D.R. Worsnop, C.E. Kolb, J.H. Shorter, S.C. Herndon, M.S. Zahniser, D. Salcedo, K. Dzepina, J.L. Jimenez, J.M. Ortega, K.S. Johnson, G.J. McRae, L.T. Molina, M.J. Molina, Atmos. Chem. Phys., 6, 4889-4904, 2006.

Separation of emitted and photochemical formaldehyde in Mexico City using a statistical analysis and a new pair of gas-phase tracers, A.R. Garcia, R. Volkamer, L.T. Molina, M.J. Molina, J. Samuelson, J. Mellqvist, B. Galle, S.C. Herndon, C.E. Kolb, Atmos. Chem. Phys. 6, 4545-4577, 2006.

Air emission inventories in North America: A critical assessment, C.A. Miller, G. Hidy, J. Hales, C.E. Kolb, A.S. Werner, B. Haneke, D. Parrish, H.C. Frey, L. Rojas-Bracho, M. Deslauriers, B. Pennell, J.D. Mobley, J. Air & Waste Manage. Assoc., 56, 1115-1129, 2006.

On-road measurements of volatile organic compounds in the Mexico City metropolitan area using proton transfer reaction mass spectrometry, T.M. Rogers, E.P. Grimsrud, S.C. Herndon, J.T. Jayne, D.E. Kolb, E. Allwine, H. Westberg, B.K. Lamb, M. Zavala, L.T. Molina, M.J. Molina, W.B. Knighton, Int. J. Mass spectrom., 252, 26-37, 2006.

Characterization of a near-room-temperature, continuous-wave quantum cascade laser for long-term, unattended monitoring of nitric oxide in the atmosphere, DD. Nelson, J.B. McManus, S.C. Herndon, J.H. Shorter, M.S. Zahniser, S. Blaser, L. Hvozdara, A. Muller, M. Giovannini, J. Faist, Opt. Lett., 31, 2012, 2006.

Technical note: Evaluation of standard ultraviolet absorption ozone monitors in a polluted urban environment, E.J. Dunlea, S.C. Herndon, D.D. Nelson, R.M. Volkamer, B.K. Lamb, E.J. Allwine, M. Grutter, C.R. Ramos Villegas, C. Marquez, S. Blanco, B. Cardenas, C.E. Kolb, L.T. Molina, M.J. Molina, Atmos. Chem. Phys., 6, 3163-3180, 2006.

Hydrocarbon emissions from in-use commercial aircraft during airport operations, S.C. Herdon, T. Rogers, E.J. Dunlea, J.T. Jayne, R. Miake-Lye, B. Knighton, Environ. Sci. Tech., 40, 4416-4413, 2006.

Measurement of nitrogen dioxide in cigarette smoke using quantum cascade tunable infrared laser differential absorption spectroscopy (TILDAS), J.H. Shorter, D.D. Nelson, M.S. Zahniser, M.E. Parrish, D.R. Crawford, D.L. Gee, Spectrochem. Acta A, 63, 994-1001, 2006.

What are the instrumentation requirements for measuring the isotopic composition of net ecosystem exchange of CO2 using eddy covariance methods?, S.R. Saleska, J.H. Shorter, S. Herndon, R. Jiménez, J.B. McManus, J.W. Munger, D.D. Nelson, MS. Zahniser, Isot. Environ. Health Studies, 42, 115-133, 2006.

Characterization of a near-room-temperature, continuous-wave quantum cascade laser for long-term, unattended monitoring of nitric oxide in the atmosphere, D.D. Nelson, J.B. McManus, S.C. Herndon, J.H. Shorter, M.S. Zahniser, S.Blaser, L.Hvozdara, A.Muller, M.Giovannini, and J.Faist, Opt. Lett. 31, 2012-2014, 2006. {abstract}

Atmospheric reactive nitrogen concentration and flux budgets at a Northeastern U.S. forest site, C.V. Horii, J.W. Munger, S.C. Wofsy, M. Zahniser, D. Nelson, J.B. McManus, Agr. Forest Meteorol., 133, 210-225, 2005.

Vehicle fleet emissions of black carbon, polycyclic aromatic hydrocarbons, and other pollutants measured by a mobile laboratory in Mexico City, M. Jieng, L.C. Marr, E.J. Dunlea, S.C. Herndon, J.T. Jayne, C.E. Kolb, W.B. Knighton, T.M. Rogers, M. Zavala, L.T. Molina, M.J. Molina, Atmos. Chem. Phys., 5, 3377-3387, 2005.

A high precision pulsed quantum cascade laser spectrometer for measurements of stable isotopes of carbon dioxide, J.B. McManus, D.D. Nelson, J.H. Shorter, R. Jimenez, S. Herndon, S. Saleska, M. Zahniser, J. Mod. Optics, 52, 2309-2321, 2005.

Real-time measurements of SO2 H2CO, and CH4 emissions from in-use curbside passenger buses in New York City  using a chase vehicle, S.C. Herndon, J.H. Shorter, M.S. Zahniser, J. Wormhoudt, D.D. Nelson, K.L. Demerjian, C.E. Kolb, Environ. Sci. Technol. 39, 7984-7990, 2005.

Real-time measurements of nitrogen oxide emissions from in-use New York City transit buses using a chase vehicle, J.H. Shorter, S. Herndon, M.S. Zahniser, D.D. Nelson, J. Wormhoudt, K.L. Demerjian, C.E. Kolb, Environ. Sci. Technol. 39, 7991-8000, 2005.

Characterization of urban pollutant emission fluxes and ambient concentration distributions using a mobile laboratory with rapid response instrumentation, S.C. Herndon, J.T. Jayne, M.S. Zahniser, D.R. Worsnop, B. Knighton, E. Alwine, B.K. Lamb, M. Zavala, D.D. Nelson, J.B. McManus, J.H. Shorter, M.R. Canagaratna, T.B. Onasch, C.E. Kolb, Faraday Discuss., 130, 327-339, 2005.

Temperature and gas-phase composition measurements in supersonic flows using tunable diode laser absorption spectroscopy: The effect of condensation on the boundary-layer thickness, S. Tanimura, Y. Zvinevich, B.E. Wyslouzil, M.S. Zahniser, J.H. Shorter, D.D. Nelson, J.B. McManus, J. Chem. Phys., 122, 194304 (11 pages), 2005.

Atmospheric Trace Gas Measurements Using a Dual Quantum-Cascade Laser Mid-Infrared Absorption Spectrometer, R. Jimenez, S. Herndon, J.H. Shorter, D.D. Nelson, J.B. McManus, M.S. Zahniser, Proceedings of SPIE V.5738, 318-330: Novel in-Plane Semiconductor Lasers IV, ed. by C. Mermelstein, D.P. Bour, 2005.

Air Quality in Selected Megacities, L.T. Molina, M.J. Molina, R.S. Slott, C.E. Kolb, P. K. Gbor, F. Meng, R.B. Singh, O. Galvez, J.J. Sloan, W.P. Anderson, X. Tang, M. Hu, S. Xie, M. Shao, T. Zhu, Y.H. Zhang, B.R. Gurjar, P.E. Artaxo, P. Oyola, E. Gramsch, D. Hidalgo, and A.W. Gertler, J. Air Waste Manage. Assoc. 54, 1-73, 2004.

Quad Quantum Cascade Laser Spectrometer With Dual Gas Cells for the Simultaneous Analysis of Mainstream and Sidestream Cigarette Smoke, R.E. Baren, M.E. Parrish, K.H. Shafer, C.N. Harward, Q. Shi, D.D. Nelson, J.B. McManus, M.S. Zahniser, Spectrochimica Acta A, 60, 3437-3447, 2004.

High Precision Measurements of Atmospheric Nitrous Oxide and Methane Using Thermoelectrically Cooled Mid-Infrared Quantum Cascade Lasers and Detectors, D.D. Nelson, B. McManus, S. Urbanski, S. Herndon, M.S. Zahniser, Spectrochimica Acta A, 60, 3325-3335, 2004.

Spatially Resolved Gas Phase Composition Measurements in Supersonic Flows Using Tunable Diode Laser Absorption Spectroscopy, P. Paci, Y. Zvinevich, S. Tanimura, B.E. Wyslouzil, M.S. Zahniser, J. Shorter, D. Nelson, B. McManus, J. Chem. Phys. 121, 9964- 9970, 2004.

Fast Gas Chromatography with Luminol Chemiluminescence Detection for the Simultaneous Determination of Nitrogen Dioxide and Peroxyacetyl Nitrate in the Atmosphere, N.A. Marley, G.S. Gaffney, R.V. White, L. Rodriquez-Cuadra, S.E. Herndon, E. Dunlea, R.M. Volkamer, L.T. Molina, M.J. Molina, Rev. of Sci. Instrum., 75, 4595-4605, 2004

NO and NO2 Emission Ratios Measured from In-Use Commercial Aircraft during Taxi and Takeoff, S.C. Herndon, J.H. Shorter, M.S. Zahniser, D.D. Nelson, J.T. Jayne, R.C. Brown, R.C. Miake-Lye, I. Waitz, P. Silva, T. Lanni, K. Demerjian, C.E. Kolb, Environ. Sci. Technol., 38, 6078-6084, 2004.

Mobile Laboratory with Rapid Response Instruments for Real-Time Measurements of Urban and Regional Trace Gas and Particulate Distributions and Emission Source Characteristics, C.E. Kolb, S.C. Herndon, J.B. McManus, J.H. Shorter, M.S. Zahniser, D.D. Nelson, J.T. Jayne, M.R. Canagaratna, D.R. Worsnop, Environ. Sci. Technol., 38, 5694-5703, 2004.

Determination of Line Strengths for Selected Transitions in the v2 Band Relative to the v1 and v5 Bands of H2CO, S.C. Herndon, D.D. Nelson Jr., Y. Li, M.S. Zahniser, J. Quant. Spect. & Rad. Transfer, 90, 207-216, 2005.

Environmental Monitoring with Pulsed Quantum Cascade Lasers: Seeking Sensitivity and Stability, D.D. Nelson Jr., J. B. McManus, J. Shorter, Q. Shi, M. Zahniser, B. Wyslouzil, Proceedings of the Laser Applications to Chemical and Environmental Analysis Conference, Annapolis MD, February 9-11, 2004.

Mobile Laboratory with Fast Response Instruments for Air Quality Forecast Urban Emissions and Ambient Concentration Measurements, C.E. Kolb, S.C. Herndon, J.T. Jayne, J.H. Shorter, M.S. Zahniser, D.R. Worsnop, Proc. of A&WMA's 97th Annual Conference & Exhibition Sustainable Development: Gearing Up for the Challenge!  June 22-25, 2004, Indianapolis, IN

Utilization of Tunable Infrared Laser Sensors for Cross-Road Mobile Source Emissions Characterization and Quantification, D.D. Nelson, M.S. Zahniser, J.B. McManus, C.E. Kolb, Proc. of A&WMA's 97th Annual Conference & Exhibition Sustainable Development: Gearing Up for the Challenge!  June 22-25, 2004, Indianapolis, IN

Fluxes of Nitrogen Oxides Over a Temperate Deciduous Forest, C.V. Horii, J.W. Munger, S.C. Wofsy, M. Zahniser, D.Nelson, J.B. McManus, J. Geophys. Res., 109, D08305,doi:1029/2003JD004326, 2004.

Measurement of Formaldehyde, Nitrogen Dioxide, and Sulfur Dioxide at Whiteface Mountain Using a Dual Tunable Diode Laser System, Y.Q. Li, K.L. Damerjian, M.S.Zahniser, D.D. Nelson, J.B. McManus S.C. Herndon, J. Geophy. Res., 109, D16S08, doi:1029/2003JD004091, 2004.

Influence of Atmospheric Pressure on Landfill Methane Emissions, P.M. CZepiel, J. H. Shorter, B. Mosher, E. Allwine, J.B. McManus, R.C. Harriss, C.E. Kolb, B. K. Lamb, Waste Management, 23, 593-598 (2003).

Tunable Infrared Laser Differential Absorption Spectroscopy (TILDAS) Sensors for Combustion Exhaust Pollutant Quantification, M.S. Zahniser, D.D. Nelson, and C.E. Kolb, Applied Combustion Diagnostics,  K.K. Hoeinghaus and J. B. Jeffries, ed, 648-668, Taylor & Francis (2002).

Infrared Line strengths and Pressure Broadening Coefficients in the n12 Vibrational Band of Hydrazine Measured by Infrared Tunable Diode Laser Spectroscopy, S.E. Plunkett, M.S. Zahniser, M.E. Parrish, D.D. Nelson, J.H. Shorter, J. Wormhoudt, and K.H. Shafer, J. Mol. Spec., 211, 241-247 (2002).

Infrared Laser Spectrometer with Balanced Absorption for Measurement of Isotopic Ratios of Carbon Gases, J.B. McManus, M.S. Zahniser, D.D. Nelson, L.R. Williams, and C.E. Kolb, Spectrochim. Acta 58, 2465-2479 (2002).

Hydrazine Detection Limits in the Cigarette Smoke Matrix Using Infrared Tunable Diode Laser Absorption Spectroscopy, S. Plunkett, M.E. Parrish, K.H. Shafer, J.H. Shorter, D.D. Nelson and M.S. Zahniser, Spectrochim. Acta 58, 2505-2517 (2002).

Sub-Part-Per-Billion Detection of Nitric Oxide in Air Using a Thermoelectrically Cooled Mid-Infrared Quantum Cascade Laser Spectrometer, D.D. Nelson, J.H. Shorter, J.B. McManus and M.S. Zahniser, Appl. Phys. B., 75, 343-350 (2002).

Quantum Cascade Lasers for Open- and Closed-Path Measurement of Atmospheric Trace Gases, J.B. McManus, D.D. Nelson, J.H. Shorter and M.S. Zahniser, Diode Lasers and Applications in Atmospheric Sensing, SPIE Proceedings, 4817, 22-33 (2002).

Characterization of Heavy-Duty Vehicle Exhaust in Dense Urban Environments, J.H. Shorter, S.C. Herndon, M.S. Zahniser, D.D. Nelson, J.T. Jayne, and C.E. Kolb, Proceedings of the 10th International Symposium "Transport and Air Pollution", 33-40 (2001).

Rate Constant Measurements for the Reaction of HO2 with O3 from 200 to 300 K Using a Turbulent Flow Reactor, S.C. Herndon, P.W. Villalta, D.D. Nelson, J.T. Jayne, and M.S. Zahniser, J. Phys. Chem. A, 105, 1583-1591 (2001).

Time-resolved analysis of cigarette combustion gases using a dual infrared tunable diode laser system, S. Plunkett, M.E. Parrish, K.H. Shafer, D. Nelson, J. Shorter, and M. Zahniser, Vibrational Spectroscopy, 27, 53-63 (2001).

Diode-pumped 214.8-nm Nd:YAG/Cr4+:YAG microchip laser system for the detection of NO, J. Wormhoudt, J.H. Shorter, C.C. Cook, and J.J. Zayhowski, Appl. Optics, 39, 4418-4424 (2000).

Diode-pumped 214.8-nm Nd:YAG/Cr4+:YAG microchip laser system for the detection of NO, J. Wormhoudt, J.H. Shorter, J.J. Zayhowski, Symposium on "Laser Applications to Chemical and Environmental Analysis", 33-35 (2000).

Remote Sensing of NO and NO2 Emissions from Heavy-Duty Diesel Trucks Using Tunable Diode Lasers, J.L. Jimenez, G.J. McRae, D.D. Nelson, M.S. Zahniser, and C.E. Kolb, Environ. Sci & Technol., 2380-2387 (2000).

IRMA: A tunable infrared multi-component acquisition system for plasma diagnostics, J. Röpcke, L. Mechold, M. Käning, J. Anders, F.G. Wienhold, D. Nelson, and M. Zahniser, Rev. Sci. Instru., 71, 3706-3710 (2000).

IRMA: A Tunable Infrared Multi-Component Acquisition System for Plasma Diagnostics, J. Röpcke, L. Mechold, J. Anders, F.G. Wienhold, D. Nelson, M. Zahniser, and J. Wormhoudt,  Symposium on "Laser Applications to Chemical and Environmental Analysis", 88-90 (2000).

Guidance for the Performance Evaluation of Three-Dimensional Air Quality Modeling Systems for Particulate Matter and Visibility, C. Seigneur, B. Pun, P. Pai, J.F. Louis, P. Solomon, C. Emery, R. Morris, M. Zahniser, D. Worsnop, P. Koutrakis, W. White, and I. Tombach, J. Air & Waste Manage. Assoc., 50 588-599 (2000).

Cross road and mobile tunable infrared laser measurements of nitrous oxide emissions from motor vehicles, J.L. Jimenez, J.B. McManus, J.H. Shorter, D.D. Nelson, M.S. Zahniser, M. Koplow, G.J. McRae, and C.E. Kolb, Chemosphere - Global Change Science, 2, 397-412 (1999).

Characterization of On-Road Vehicle NO Emissions by a TILDAS Remote Sensor, J.L. Jimenez, M.D. Koplow, D.D. Nelson, M.S. Zahniser and S.E. Schmidt, J. Air & Waste Manage. Asso., 49, 463-470 (1999).

Nitric Acid and Nitrogen Dioxide Flux Measurements: A New Application of Tunable diode Laser Absorption Spectroscopy, C.V. Horii, M.S. Zahniser, D.D. Nelson, J.B. McManus and S.C. Wofsy, Application of Tunable Diode and Other Infrared Sources for Atmospheric Studies and Industrial Process Monitoring, SPIE Proceedings, V. 3758, 152-161 (1999).

A Tunable Diode Laser System for the Remote Sensing of On-Road Vehicle Emissions, D.D. Nelson, M.S. Zahniser, J. B. McManus, C.E. Kolb, and J.L. Jimenez, Appl. Phys. B, 67, 433-441, (1998).

Air-broadened Linewidth Measurements in the O2 Vibrational Band of HOCl, J.H. Shorter, D.D. Nelson, and M.S. Zahniser. J. Chem. Soc. Faraday. Trans., 93, 2933-2935 (1997).

Tunable Infrared Laser Detection of Pyrolysis Products of Explosives in Soils, J. Wormhoudt, J.H. Shorter, J.B. McManus, P.L. Kebabian, M.S. Zahniser, W.M. Davis, E.R. Cespedes and C.E. Kolb, Appl. Optics, 35, 3992-3997 (1996).

Infrared Absorption by Methane Isotopes Near 2999 cm-1: An Analytical Method Using the Zeeman Split He-Ne Line at 2999.24 cm-1, P.L. Kebabian, M.S. Zahniser and C.E. Kolb, Appl. Optics, 35, 1942-1949 (1996).

Astigmatic mirror multipass absorption cells for long-path-length spectroscopy, J.B. McManus, P.L. Kebabian, and M.S. Zahniser, Applied Optics, 34, 3336-3348 (1995).(Abstract)

Measurement of Trace Gas Fluxes Using Tunable Diode Laser Spectroscopy, M.S. Zahniser, D.D. Nelson, J.B. McManus and P.L. Kebabian. Phil. Trans. Roy. Soc. Lond. A., 351, 371-382 (1995).

Rapid Degradation of Atmospheric Methyl Bromide in Soils, J.H. Shorter, C.E. Kolb, P.M. Crill, R.A. Kerwin, R.W. Talbot, M.E. Hines and R.C. Harriss, Nature, 377, 717-719 (1995).

Trace Gas Flux Measurements at the Landscape Scale Using Boundary Layer Budgets, T.W. Choularton, M.W. Gallagher, K.N. Bower, D. Fowler, M. Zahniser, and A. Kaye, Phil. Trans. Roy. Soc. Lond. A., 351, 357-369 (1995).

Metastable Phases in Polar Stratospheric Aerosols, L.E. Fox, D.R. Worsnop, M.S. Zahniser, and S.C. Wofsy, Science, 267, 351 (1995).

Recent Advances in Spectroscopic Instrumentation for Measuring Stable Gases in the Natural Environment, C.E. Kolb, J.C. Wormhoudt, and M.S. Zahniser, in Methods in Ecology: Biogenic Trace Gases: Measuring Emissions from Soil and Water, P.A. Matson and R.C. Harriss, eds., Blackwell Scientific Publishers, Ltd., 259-290 (1995).

Development of Atmospheric Tracer Methods to Measure Methane Emissions from Natural Gas Facilities and Urban Areas, B. Lamb, J.B. McManus, J.H. Shorter, C.E. Kolb, B. Mosher, R.C. Harriss, E. Allwine, D. Blaha, T. Howard, A. Guenther, R.A. Lott, R. Siverson, H. Westberg and P. Zimmerman, Environ. Sci. Technol., 29, 1468-1479 (1995).

Measurements of CH4 and N2O Fluxes at the Landscape Scale Using Micrometeorological Methods, D. Fowler, K.J. Hargreaves, U. Skiba, R. Milne, M.S. Zahniser, J.B. Moncrieff, I.J. Beverland, and M.W. Gallagher, Phil. Trans. Roy. Soc. Lond. A., 351, 339-356 (1995).

A Mechanistic Study of the Reaction of HO2 Radical with Ozone, D.D. Nelson, Jr. and M.S. Zahniser. J. Phys. Chem., 98, 2101 (1994).

Eddy Covariance Measurements of Trace Gas Fluxes in Northern Europe by Tunable Diode Laser Spectroscopy, K.J. Hargreaves, D. Fowler, U. Skiba, R. Milne, K.A. Smith, and M.S. Zahniser, Annales Geophysicue, Supplement II to Volume 12. Oceans, Atmosphere, Hydrology and non-linear Geophysics. European Geophysical Society, Grenoble (1994).

Air-Broadened Linewidth Measurements in the O2 Vibrational Band of the Hydroperoxyl Radical, D.D. Nelson, Jr. and M.S. Zahniser., J. Mol. Spec., 166, 273 (1994).

Mapping Urban Sources of Atmospheric Methane, D. Blaha, B. Mosher, R.C. Harriss, C.E. Kolb, J.B. McManus, J.H. Shorter and B. Lamb, Geo. Info. Systems, 4, 34-38 (1994).

OH Reaction Kinetics and Atmospheric Lifetimes of CF3CFHCF3 and CF3CH2Br, D.D. Nelson, Jr., M.S. Zahniser, and C.E. Kolb. Geophys. Res. Lett., 20, 197-200 (1993).

Quantum Yields for OH Production From 193 nm and 248 nm Photolysis of HNO3 and H2O2, A. Schiffman, D.D. Nelson, Jr., and D.J. Nesbitt. J. Chem. Phys., 98, 6935 (1993).

Vapor Pressures of Solid Hydrates of Nitric Acid: Implications for Polar Stratospheric Clouds, D.R., Worsnop, L.E. Fox, M.S. Zahniser, and S.C. Wofsy, Science, 259, 71-74, (1993).

Molecular Beam Chemistry: Magnetic Deflection Analysis of Monoxide Electronic States from Alkali Atom + Ozone Reactions, X. Shi, D.R. Herschbach, D.R. Worsnop and C.E. Kolb, J. Phys. Chem. 97, 2113-2122 (1993).

The Neutral Gas Laser: A Tool for Remote Sensing of Chemical Species by Infrared Absorption, P.L. Kebabian and C.E. Kolb, in Sampling and Analysis of Airborne Pollutants, E.D. Winegar and L.H. Keith, eds., 257-273, Lewis Publishers, Boca Raton, FL (1993).

Chemical Kinetics of the Reactions of OH Radicals with CF3CFHCF3 and CF3CH2Br, D.D. Nelson, Jr., M.S. Zahniser, and C.E. Kolb, Geophys. Res. Lett. 20, 197-200 (1993).

Electron Energy Distribution From Intense Electron Beams in the Lower Thermosphere, M. Martinez-Sanchez, W. Cheng, D. Dvore, and M.S. Zahniser, J. Geophys. Res. 97, 1363-1375 (1992).

Chemical Kinetic Studies of Atmospheric Reactions Using Tunable Diode Laser Spectroscopy, D.R.Worsnop, D.D. Nelson, and M.S. Zahniser, Proceedings of the SPIE Conference on Optical Methods in Atmospheric Chemistry, SPIE 1715, 18-33 (1992).

Low Temperature Absolute Rate Constants for the Reaction of Atomic Sodium with Ozone and Nitrous Oxide, D.R. Worsnop, M.S. Zahniser, and C.E. Kolb, J. Phys. Chem., 95, 3960-3964 (1991), Errata, J. Phys. Chem., 96, 9088 (1992).

Micrometeorological Measurements of CH4 and CO2 Exchange Between the Atmosphere and the Arctic Tundra, S.M. Fan, S.C. Wofsy, P.S. Bakwin, D.L. Jacob, S.M. Anderson, P.L. Kebabian, J.B. McManus, C.E. Kolb, and D.R. Fitzjarald, J. Geophys. Res. 97, 16,627-16,643 (1992).

Chemical Kinetics of the Reactions of OH Radical with Several Propane Based HCFCs, D.D. Nelson, Jr., M.S. Zahniser, and C.E. Kolb, J. Phys. Chem., 96, 249-253 (1992).

Excitation Mechanism of the Mesospheric Sodium Nightglow, D.R. Herschbach, C.E. Kolb, D.R. Worsnop and X. Shi, Nature, 356, 414-416 (1992).

Chemical Kinetics and Dynamics of the Mesospheric Sodium Nightglow, C.E. Kolb, D.R. Worsnop, M.S. Zahniser, G.N. Robinson, X. Shi, and D.R. Herschbach, in Gas Phase Metal Reactions, A. Fontijn, ed., 15-27, North-Holland (1992).

Uptake of Gas Phase Aldehydes by Water Surfaces, J.T. Jayne, S.X. Duan, P. Davidovits, D.R. Worsnop, M.S. Zahniser, and C.E. Kolb, J. Phys. Chem., 96, 5452-5460 (1992).

Tropospheric Heterogeneous Chemistry of Haloacetyl and Carbonyl Halides, W.J. De Bruyn, S.X. Duan, X.Q. Shi, P. Davidovits, D.R. Worsnop, M.S. Zahniser and C.E. Kolb, Geophys. Res. Lett., 19, 1939-1942 (1992).

Diode Laser Spectroscopy of the O3 Vibration of the HO2 Radical, D.D. Nelson and M.S. Zahniser, J. Mol. Spectrosc., 150, 527-534 (1991).

Open-Path Tunable Diode Laser Absorption for Eddy Correlation Flux Measurements of Atmospheric Trace Gases, S.M. Anderson and M.S. Zahniser, Proceedings of SPIE Laser Spectroscopy Symposium, Measurement of Atmospheric Gases, SPIE 1433, 167-178 (1991).

Instrumentation for Chemical Species Measurements in the Troposphere and Stratosphere, C.E. Kolb, Rev. of Geophys. Supplement - U.S. National Report to IUGG 1987-1990, 25-36 (1991).

Measuring Urban Fluxes of Methane, J.B. McManus, C.E. Kolb, P.M. Crill, R.C. Harriss, B. Mosher, B. Lamb, K. Maas, and J. Ryddock, World Resource Rev., 162-182 (1991).

Rethinking the Ozone Problem in Urban and Regional Air Pollution, J.H. Seinfeld, R. Atkinson, R.L. Berglund, W.L. Chameides, W.R. Cotton, K.L. Demerjian, J.C. Elston, F. Fehsenfeld, B.J. Finlayson Pitts, C.E. Kolb, P.J. Lioy, R.C. Harriss, J.A. Logan, M.J. Prather, A. Russell and B. Steigerwald, 500pp, National Academy Press, Washington, D.C. (1991).

High Resolution Infrared Flash Kinetic Spectroscopy of OH Radicals, A. Schiffman, D.D. Nelson Jr., M.S. Robinson, and D.J. Nesbit, J. Chem. Phys., 95, 2629 (1991)

Narrow Optical Interference Fringes for Certain Setup Conditions in Multipass Absorption Cells of the Herriott Type, J.B. McManus and P.L. Kebabian, Appl. Optics, 29, 898 (1990).