Sciences and Exploration Directorate

Jason Michael St Clair


Jason Michael St Clair's Contact Card & Information.
Phone: 301.614.5714
Org Code: 614
Mail Code 614
Greenbelt, MD 20771


Post Doctorate in Environmental Science and Engineering, California Institute of Technology, 2007-2011                                             In situ observations using chemical ionization mass spectrometry, advisor: Paul O. Wennberg

Ph. D. in Chemistry, Harvard University, 2007
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, Colby College, 2000



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]