Jason Michael St Clair
(RESEARCH SCIENTIST)
| Email: | jason.m.stclair@nasa.gov |
| Phone: | 301.614.5714 |
| Org Code: | |
| Address: |
NASA/GSFC Mail Code 614 Greenbelt, MD 20771 |
| Employer: | UNIVERSITY OF MARYLAND BALTIMORE CO |
Brief Bio
PI, GSFC Infrared Remote Sensing Laboratory
co-I, GSFC In Situ Measurements Laboratory
Lab Manager, GSFC In Situ Measurements Laboratory
Current Projects
US network of EM27/SUN spectrometers
Earth's Atmosphere
I am leading the creation of a ground-based IR remote sensing spectrometer network in the US to measure total column abundances of trace gases in the Earth's atmosphere. Our measurements will improve satellite validation and inversion model evaluation, as well as provide data sets for scientific analysis.
Airborne measurements of reactive trace gases
Atmospheric Chemistry
Positions/Employment
Research associate professor
University of Maryland, Baltimore County - NASA GSFC
2023 - Present
Research assistant professor
University of Maryland, Baltimore County - NASA GSFC
2014 - 2023
Staff scientist
California Institute of Technology, Linde Center for Global Environmental Science - Pasadena, CA
2011 - 2014
Post Doctorate in Environmental Science and Engineering
California Institute of Technology - Pasadena, CA
2007 - 2011
In situ observations using chemical ionization mass spectrometry
advisor: Paul O. Wennberg
Education
Ph. D. in Chemistry, 2007
Harvard University
Elucidating the Sources of Upper Tropospheric and Lower Stratospheric Humidity Through the in situ Measurement of HDO and H2O
advisor: James G. Anderson.
BA in Chemistry, minors in Mathematics and Geology, 2000
Colby College
Publications
Refereed
2026. "Insights on ozone formation sensitivity in Southeast and East Asian megacities during ASIA-AQ.", Atmospheric Chemistry and Physics, 26 (9): 6097-6116 [10.5194/acp-26-6097-2026] [Journal Article/Letter]
2026. "Trace Organic Gas Analyzer Time-of-Flight mass spectrometer (TOGA-TOF) system for airborne observations of formaldehyde.", Atmospheric Measurement Techniques, 19 (9): 2985-3000 [10.5194/amt-19-2985-2026] [Journal Article/Letter]
2026. "The Dynamics and Chemistry of the Summer Stratosphere (DCOTSS) Project.", Bulletin of the American Meteorological Society, 107 (3): E696-E717 [10.1175/bams-d-24-0177.1] [Journal Article/Letter]
2026. "A systematic comparison of ACE-FTS δ D retrievals with airborne in situ sampling.", Atmospheric Measurement Techniques, 19 (4): 1147-1163 [10.5194/amt-19-1147-2026] [Journal Article/Letter]
2024. "Opinion: Beyond global means – novel space-based approaches to indirectly constrain the concentrations of and trends and variations in the tropospheric hydroxyl radical (OH).", Atmospheric Chemistry and Physics, 24 (22): 13001-13023 [10.5194/acp-24-13001-2024] [Journal Article/Letter]
2022. "Source and Chemistry of Hydroxymethanesulfonate (HMS) in Fairbanks, Alaska.", Environmental Science & Technology, 56 (12): 7657-7667 [10.1021/acs.est.2c00410] [Journal Article/Letter]
2022. "Photochemical evolution of the 2013 California Rim Fire: synergistic impacts of reactive hydrocarbons and enhanced oxidants.", Atmospheric Chemistry and Physics, 22 (6): 4253-4275 [10.5194/acp-22-4253-2022] [Journal Article/Letter]
2022. "The NASA Atmospheric Tomography (ATom) Mission: Imaging the Chemistry of the Global Atmosphere.", Bulletin of the American Meteorological Society, 103 (3): E761-E790 [10.1175/bams-d-20-0315.1] [Journal Article/Letter]
2021. "Formaldehyde evolution in US wildfire plumes during the Fire Influence on Regional to Global Environments and Air Quality experiment (FIREX-AQ).", Atmospheric Chemistry and Physics, 21 (24): 18319-18331 [10.5194/acp-21-18319-2021] [Journal Article/Letter]
2021. "Ozone chemistry in western U.S. wildfire plumes.", Science Advances, 7 (50): [10.1126/sciadv.abl3648] [Journal Article/Letter]
2021. "Heterogeneity and chemical reactivity of the remote troposphere defined by aircraft measurements.", Atmospheric Chemistry and Physics, 21 (18): 13729-13746 [10.5194/acp-21-13729-2021] [Journal Article/Letter]
2021. "Evolution of formaldehyde (HCHO) in a plume originating from a petrochemical industry and its volatile organic compounds (VOCs) emission rate estimation.", Elementa: Science of the Anthropocene, 9 (1): [10.1525/elementa.2021.00015] [Journal Article/Letter]
2021. "Hydroxymethanesulfonate (HMS) Formation during Summertime Fog in an Arctic Oil Field.", Environmental Science & Technology Letters, 8 (7): 511-518 [10.1021/acs.estlett.1c00357] [Journal Article/Letter]
2020. "Validation of satellite formaldehyde (HCHO) retrievals using observations from 12 aircraft campaigns.", Atmospheric Chemistry and Physics, 20 (20): 12329-12345 [10.5194/acp-20-12329-2020] [Journal Article/Letter]
2020. "Vertical Transport, Entrainment, and Scavenging Processes Affecting Trace Gases in a Modeled and Observed SEAC 4 RS Case Study.", Journal of Geophysical Research: Atmospheres, 125 (11): [10.1029/2019jd031957] [Journal Article/Letter]
2020. "Missing OH reactivity in the global marine boundary layer.", Atmospheric Chemistry and Physics, 20 (6): 4013-4029 [10.5194/acp-20-4013-2020] [Journal Article/Letter]
2020. "Comprehensive isoprene and terpene gas-phase chemistry improves simulated surface ozone in the southeastern US.", Atmospheric Chemistry and Physics, 20 (6): 3739-3776 [10.5194/acp-20-3739-2020] [Journal Article/Letter]
2020. "Exploring Oxidation in the Remote Free Troposphere: Insights From Atmospheric Tomography (ATom).", Journal of Geophysical Research: Atmospheres, 125 (1): [10.1029/2019jd031685] [Journal Article/Letter]
2019. "A new laser-based and ultra-portable gas sensor for indoor and outdoor formaldehyde (HCHO) monitoring.", Atmospheric Measurement Techniques, 12 (11): 6079-6089 [10.5194/amt-12-6079-2019] [Journal Article/Letter]
2019. "CAFE: a new, improved nonresonant laser-induced fluorescence instrument for airborne in situ measurement of formaldehyde.", Atmospheric Measurement Techniques, 12 (8): 4581-4590 [10.5194/amt-12-4581-2019] [Journal Article/Letter]
2019. "Atmospheric Acetaldehyde: Importance of Air‐Sea Exchange and a Missing Source in the Remote Troposphere.", Geophysical Research Letters, 46 (10): 5601-5613 [10.1029/2019gl082034] [Journal Article/Letter]
2019. "Mapping hydroxyl variability throughout the global remote troposphere via synthesis of airborne and satellite formaldehyde observations.", Proceedings of the National Academy of Sciences, 116 (23): 11171-11180 [10.1073/pnas.1821661116] [Journal Article/Letter]
2019. "Towards a satellite formaldehyde – in situ hybrid estimate for organic aerosol abundance.", Atmospheric Chemistry and Physics, 19 (5): 2765-2785 [10.5194/acp-19-2765-2019] [Journal Article/Letter]
2018. "Kinetics and Product Yields of the OH Initiated Oxidation of Hydroxymethyl Hydroperoxide.", The Journal of Physical Chemistry A, 122 (30): 6292-6302 [10.1021/acs.jpca.8b04577] [Journal Article/Letter]
2018. "High-resolution inversion of OMI formaldehyde columns to quantify isoprene emission on ecosystem-relevant scales: application to the southeast US.", Atmospheric Chemistry and Physics, 18 (8): 5483-5497 [10.5194/acp-18-5483-2018] [Journal Article/Letter]
2018. "Gas-Phase Reactions of Isoprene and Its Major Oxidation Products.", Chemical Reviews, 118 (7): 3337-3390 [10.1021/acs.chemrev.7b00439] [Journal Article/Letter]
2017. "A new non-resonant laser-induced fluorescence instrument for the airborne in situ measurement of formaldehyde.", Atmospheric Measurement Techniques, 10 (12): 4833-4844 [10.5194/amt-10-4833-2017] [Journal Article/Letter]
2017. "Emissions of Glyoxal and Other Carbonyl Compounds from Agricultural Biomass Burning Plumes Sampled by Aircraft.", Environmental Science & Technology, 51 (20): 11761-11770 [10.1021/acs.est.7b03517] [Journal Article/Letter]
2017. "Observations of VOC emissions and photochemical products over US oil- and gas-producing regions using high-resolution H3O+ CIMS (PTR-ToF-MS).", Atmospheric Measurement Techniques, 10 (8): 2941-2968 [10.5194/amt-10-2941-2017] [Journal Article/Letter]
2017. "Airborne measurements of western U.S. wildfire emissions: Comparison with prescribed burning and air quality implications.", Journal of Geophysical Research: Atmospheres, 122 (11): 6108-6129 [10.1002/2016jd026315] [Journal Article/Letter]
2016. "Why do models overestimate surface ozone in the Southeast United States?.", Atmospheric Chemistry and Physics, 16 (21): 13561-13577 [10.5194/acp-16-13561-2016] [Journal Article/Letter]
2016. "Investigation of a potential HCHO measurement artifact from ISOPOOH.", Atmospheric Measurement Techniques, 9 (9): 4561-4568 [10.5194/amt-9-4561-2016] [Journal Article/Letter]
2016. "Speciation of OH reactivity above the canopy of an isoprene-dominated forest.", Atmospheric Chemistry and Physics, 16 (14): 9349-9359 [10.5194/acp-16-9349-2016] [Journal Article/Letter]
2016. "Agricultural fires in the southeastern U.S. during SEAC4RS: Emissions of trace gases and particles and evolution of ozone, reactive nitrogen, and organic aerosol.", J. Geophys. Res. Atmos., 121 (12): 7383-7414 [10.1002/2016jd025040] [Journal Article/Letter]
2016. "Organic nitrate chemistry and its implications for nitrogen budgets in an isoprene- and monoterpene-rich atmosphere: constraints from aircraft (SEAC4RS) and ground-based (SOAS) observations in the Southeast US.", Atmos. Chem. Phys., 16 (9): 5969-5991 [10.5194/acp-16-5969-2016] [Journal Article/Letter]
2016. "Convective transport and scavenging of peroxides by thunderstorms observed over the central U.S. during DC3.", Journal of Geophysical Research: Atmospheres, 121 (8): 4272-4295 [10.1002/2015jd024570] [Journal Article/Letter]
2016. "Wet scavenging of soluble gases in DC3 deep convective storms using WRF-Chem simulations and aircraft observations.", Journal of Geophysical Research: Atmospheres, 121 (8): 4233-4257 [10.1002/2015jd024623] [Journal Article/Letter]
2016. "Kinetics and Products of the Reaction of the First-Generation Isoprene Hydroxy Hydroperoxide (ISOPOOH) with OH.", The Journal of Physical Chemistry A, 120 (9): 1441-1451 [10.1021/acs.jpca.5b06532] [Journal Article/Letter]
2015. "Characterization of a real-time tracer for isoprene epoxydiols-derived secondary organic aerosol (IEPOX-SOA) from aerosol mass spectrometer measurements.", Atmospheric Chemistry and Physics, 15 (20): 11807-11833 [10.5194/acp-15-11807-2015] [Journal Article/Letter]
2015. "Quantifying sources and sinks of reactive gases in the lower atmosphere using airborne flux observations.", Geophysical Research Letters, 42 (19): 8231-8240 [10.1002/2015gl065839] [Journal Article/Letter]
2015. " Isoprene NO 3 Oxidation Products from the RO 2 + HO 2 Pathway .", The Journal of Physical Chemistry A, 119 (40): 10158-10171 [10.1021/acs.jpca.5b06355] [Journal Article/Letter]
2015. "Sources, seasonality, and trends of southeast US aerosol: an integrated analysis of surface, aircraft, and satellite observations with the GEOS-Chem chemical transport model.", Atmospheric Chemistry and Physics, 15 (18): 10411-10433 [10.5194/acp-15-10411-2015] [Journal Article/Letter]
2015. "Formation of Low Volatility Organic Compounds and Secondary Organic Aerosol from Isoprene Hydroxyhydroperoxide Low-NO Oxidation.", Environmental Science & Technology, 49 (17): 10330-10339 [10.1021/acs.est.5b02031] [Journal Article/Letter]
2015. "The Deep Convective Clouds and Chemistry (DC3) Field Campaign.", Bulletin of the American Meteorological Society, 96 (8): 1281-1309 [10.1175/bams-d-13-00290.1] [Journal Article/Letter]
2015. "Hydroxy nitrate production in the OH-initiated oxidation of alkenes.", Atmospheric Chemistry and Physics, 15 (8): 4297-4316 [10.5194/acp-15-4297-2015] [Journal Article/Letter]
2015. "Airborne measurements of organosulfates over the continental U.S.", Journal of Geophysical Research: Atmospheres, 120 (7): 2990-3005 [10.1002/2014jd022378] [Journal Article/Letter]
2015. "Rapid deposition of oxidized biogenic compounds to a temperate forest.", Proceedings of the National Academy of Sciences of the United States of America (PNAS), 112 (5): E392–E401 [10.1073/pnas.1418702112] [Journal Article/Letter]
2014. "Overview of the Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT): mechanistic chamber studies on the oxidation of biogenic compounds.", Atmospheric Chemistry and Physics, 14 (24): 13531-13549 [10.5194/acp-14-13531-2014] [Journal Article/Letter]
2014. "Conversion of hydroperoxides to carbonyls in field and laboratory instrumentation: Observational bias in diagnosing pristine versus anthropogenically controlled atmospheric chemistry.", Geophysical Research Letters, 41 (23): 8645-8651 [10.1002/2014gl061919] [Journal Article/Letter]
2014. "Emissions of organic carbon and methane from petroleum and dairy operations in California's San Joaquin Valley.", Atmospheric Chemistry and Physics, 14 (10): 4955-4978 [10.5194/acp-14-4955-2014] [Journal Article/Letter]
2014. "Quantification of hydroxyacetone and glycolaldehyde using chemical ionization mass spectrometry.", Atmospheric Chemistry and Physics, 14 (8): 4251-4262 [10.5194/acp-14-4251-2014] [Journal Article/Letter]
2014. "On the temperature dependence of organic reactivity, nitrogen oxides, ozone production, and the impact of emission controls in San Joaquin Valley, California.", Atmospheric Chemistry and Physics, 14 (7): 3373-3395 [10.5194/acp-14-3373-2014] [Journal Article/Letter]
2014. "Gas Phase Production and Loss of Isoprene Epoxydiols.", The Journal of Physical Chemistry A, 118 (7): 1237-1246 [10.1021/jp4107958] [Journal Article/Letter]
2013. "Observational Insights into Aerosol Formation from Isoprene.", Environmental Science & Technology, 47 (20): 11403-11413 [10.1021/es4011064] [Journal Article/Letter]
2012. "An analysis of fast photochemistry over high northern latitudes during spring and summer using in-situ observations from ARCTAS and TOPSE.", Atmospheric Chemistry and Physics, 12 (15): 6799-6825 [10.5194/acp-12-6799-2012] [Journal Article/Letter]
2012. "Importance of biogenic precursors to the budget of organic nitrates: observations of multifunctional organic nitrates by CIMS and TD-LIF during BEARPEX 2009.", Atmospheric Chemistry and Physics, 12 (13): 5773-5785 [10.5194/acp-12-5773-2012] [Journal Article/Letter]
2012. "Impact of the deep convection of isoprene and other reactive trace species on radicals and ozone in the upper troposphere.", Atmospheric Chemistry and Physics, 12 (2): 1135-1150 [10.5194/acp-12-1135-2012] [Journal Article/Letter]
2012. "Photolysis, OH reactivity and ozone reactivity of a proxy for isoprene-derived hydroperoxyenals (HPALDs).", Physical Chemistry Chemical Physics, 14 (20): 7276 [10.1039/c2cp40388a] [Journal Article/Letter]
2011. "Comparison of chemical characteristics of 495 biomass burning plumes intercepted by the NASA DC-8 aircraft during the ARCTAS/CARB-2008 field campaign.", Atmospheric Chemistry and Physics, 11 (24): 13325-13337 [10.5194/acp-11-13325-2011] [Journal Article/Letter]
2011. "Global and regional effects of the photochemistry of CH3O2NO2: evidence from ARCTAS.", Atmospheric Chemistry and Physics, 11 (9): 4209-4219 [10.5194/acp-11-4209-2011] [Journal Article/Letter]
2010. "Chemical ionization tandem mass spectrometer for the in situ measurement of methyl hydrogen peroxide.", Review of Scientific Instruments, 81 (9): 094102 [10.1063/1.3480552] [Journal Article/Letter]
2010. "Chemistry of hydrogen oxide radicals (HOx) in the Arctic troposphere in spring.", Atmospheric Chemistry and Physics, 10 (13): 5823-5838 [10.5194/acp-10-5823-2010] [Journal Article/Letter]
2010. "The influence of convection on the water isotopic composition of the TTL and tropical stratosphere.", J. Geophys. Res. Atmos., 115 D00J20 [doi:10.1029/2009JD013100] [Journal Article/Letter]
2009. " Validation of the Harvard Lyman- α in situ water vapor instrument: Implications for the mechanisms that control stratospheric water vapor .", Journal of Geophysical Research, 114 (D23): D23301 [10.1029/2009jd012427] [Journal Article/Letter]
2009. "Unexpected Epoxide Formation in the Gas-Phase Photooxidation of Isoprene.", Science, 325 (5941): 730-733 [10.1126/science.1172910] [Journal Article/Letter]
2009. "A new cavity based absorption instrument for the detection of H2O, HDO, H2O18, and CH4.", Rev. Sci. Instrum., 80 044102 [doi:10.1063/1.3117349] [Journal Article/Letter]
2008. "Design considerations in high-sensitivity off-axis integrated cavity output spectroscopy.", Applied Physics B, 92 (3): 467-474 [10.1007/s00340-008-3137-9] [Journal Article/Letter]
2008. "Formation of large (≃100 μm) ice crystals near the tropical tropopause.", Atmospheric Chemistry and Physics, 8 (6): 1621-1633 [10.5194/acp-8-1621-2008] [Journal Article/Letter]
2008. "A new photolysis laser-induced fluorescence instrument for the detection of H[sub 2]O and HDO in the lower stratosphere.", Review of Scientific Instruments, 79 (6): 064101 [10.1063/1.2940221] [Journal Article/Letter]
2007. "Observations of deep convective influence on stratospheric water vapor and its isotopic composition.", Geophysical Research Letters, 34 (4): L04814 [10.1029/2006gl027899] [Journal Article/Letter]
2006. "Biomimetic Fabrication of 3D Structures by Spontaneous Folding of Tapes.", Journal of the American Chemical Society, 128 (29): 9314-9315 [10.1021/ja062973q] [Journal Article/Letter]