Sciences and Exploration Directorate

Steven Pawson

(Chief)

Steven Pawson's Contact Card & Information.
Email: steven.pawson-1@nasa.gov
Phone: 301.614.6159
Org Code: 610.1
Address:
NASA/GSFC
Mail Code 610.1
Greenbelt, MD 20771
Employer:
NASA

Brief Bio


Steven Pawson is the Chief of the Global Modeling and Assimilation Office at NASA Goddard Space Flight Center. In this capacity, he is responsible for guiding the development and use of the "Goddard Earth Observing System" (GEOS) Earth System modeling and data assimilation system. Steven leads GMAO's work to enhance the use of NASA's satellite observations in weather and climate analysis and to improve predictions of the physical, chemical and biological components of the Earth system on timescales ranging from days to decades.


Steven's scientific expertise is in the domain of atmospheric composition, including the representation of transport processes in models and data assimilation systems. He is author or co-author of more than 150 peer-reviewed publications. His early work focused on the stratosphere, including the ozone layer. Over time his interests have moved closer to the ground to include air pollution and the carbon cycle. He was the founding co-lead of the GEOS Chemistry-Climate Model (CCM) project and spearheaded early work on representing the carbon cycle in GEOS systems. More recently, he has overseen the introduction of the GEOS-CF (Composition Forecasting) system into the suite of GEOS products.


Steven has worked at NASA GSFC since moving to the US in 1997. Prior to this, he spent almost a decade at the Meteorological Institute of the Free University of Berlin in Germany, including six years on the teaching faculty. He completed his education in the United Kingdom, with a PhD in Meteorology (1988) from the University of Edinburgh, followed by postdoctoral position at the University of Oxford. 


Steven served for four years (2001-2005) as an Editor of the Journal of Geophysical Research - Atmospheres. He was a co-lead author of Chapter 2 in the Scientific Assessment of Ozone Depletion: 2014. He frequently enjoys speaking to broad audiences about NASA’s activities in Earth Science.

 

Positions/Employment


Chief of the Global Modeling and Assimilation Office

NASA - Goddard Space Flight Center - Greenbelt, MD, USA

February 2014 - Present



Meteorologist - Atmospheric Physicist

NASA Goddard Space Flight Center - Greenbelt, MD, USA

October 2004 - February 2014



Atmospheric Scientist

Based at NASA Goddard Space Flight Center - Greenbelt, MD, USA

September 1997 - October 2004



Research Scientist and Faculty

Meteorological Institute, Free University of Berlin - Berlin, Germany

July 1988 - August 1997



Postdoctoral Fellow

Space and Atmospheric Physics, University of Oxford - Oxford, UK

October 1987 - July 1988


Professional Service


Editor of the Journal of Geophysical Research - Atmospheres, 2000-2004

Co-lead author of Chapter 2 of the World Meteorological Organization Global Ozone Research and Monitoring Project - Report No 55: "Scientific Assessment of Ozone Depletion: 2014"

Professional Societies


American Geophysical Union

1999 - Present


American Meteorological Society

Former member of the Committee on the Middle Atmosphere

2012 - Present

Other Professional Information


ORCID identity: orcid.org/0000-0003-0200-717X

ResearcherID: http://www.researcherid.com/rid/I-1865-2014

Publication statistics (as of July 7, 2022): 171 publications; average 91 citations per paper; H-Index: 53.

Teaching Experience


Numerous classes at the Free University of Berlin: 
  • Graduate-level atmospheric physics, radiation and chemistry, including lecture-based classes and hands-on computing projects
  • Undergraduate "Radiation and Thermodynamics" 
  • Undergraduate "Dynamical Meteorology"

Education


1987: PhD, Meteorology, University of Edinburgh

1984: MSc, Atmospheric Physics and Dynamics, Imperial College, University of London

1982: BSc, Mathematics, University of York

Publications


Refereed

2023. "Application of Satellite‐Based Detections of Arctic Bromine Explosion Events Within GEOS‐Chem." Journal of Advances in Modeling Earth Systems 15 (8): [10.1029/2022ms003465] [Journal Article/Letter]

2022. "Improved advection, resolution, performance, and community access in the new generation (version 13) of the high-performance GEOS-Chem global atmospheric chemistry model (GCHP)." Geoscientific Model Development 15 (23): 8731-8748 [10.5194/gmd-15-8731-2022] [Journal Article/Letter]

2022. "Stratospheric Circulation Changes Associated with the Hunga Tonga‐Hunga Ha'apai Eruption." Geophysical Research Letters 49 [10.1029/2022gl100982] [Journal Article/Letter]

2022. "NASA GEOS Composition Forecast Modeling System GEOS‐CF v1.0: Stratospheric composition." Journal of Advances in Modeling Earth Systems 14 (e2021MS002852): [10.1029/2021ms002852] [Journal Article/Letter]

2021. "Regional impacts of COVID-19 on carbon dioxide detected worldwide from space." Science Advances 7 (45): eabf9415 [10.1126/sciadv.abf9415] [Journal Article/Letter]

2021. "Grid-stretching capability for the GEOS-Chem 13.0.0 atmospheric chemistry model." Geoscientific Model Development 14 (10): 5977-5997 [10.5194/gmd-14-5977-2021] [Journal Article/Letter]

2021. "Seasonality in prediction skill of the Madden-Julian Oscillation and associated dynamics in Version 2 of NASA's GEOS-S2S forecast system." Journal of Geophysical Research - Atmospheres 126 (18): e2021JD034961 [10.1029/2021JD034961] [Journal Article/Letter]

2021. "Augmenting the Standard Operating Procedures of Health and Air Quality Stakeholders With NASA Resources." GeoHealth 5 (9): [10.1029/2021gh000451] [Journal Article/Letter]

2021. "Bias-correcting carbon fluxes derived from land-surface satellite data for retrospective and near-real-time assimilation systems." Atmospheric Chemistry and Physics 21 9609–9628 [10.5194/acp-21-9609-2021] [Journal Article/Letter]

2021. "Description of the NASA GEOS Composition Forecast Modeling System GEOS‐CF v1.0." Journal of Advances in Modeling Earth Systems 13 (4): [10.1029/2020ms002413] [Journal Article/Letter]

2021. "Global impact of COVID-19 restrictions on the surface concentrations of nitrogen dioxide and ozone." Atmospheric Chemistry and Physics 21 (5): 3555-3592 [10.5194/acp-21-3555-2021] [Journal Article/Letter]

2020. "Seasonal Variation of the Quasi‐Biennial Oscillation Descent." Journal of Geophysical Research: Atmospheres 125 (18): [10.1029/2020jd033077] [Journal Article/Letter]

2020. "Mechanisms Linked to Recent Ozone Decreases in the Northern Hemisphere Lower Stratosphere." Journal of Geophysical Research: Atmospheres 125 (9): [10.1029/2019jd031631] [Journal Article/Letter]

2020. "Toward a Reanalysis of Stratospheric Ozone for Trend Studies: Assimilation of the Aura Microwave Limb Sounder and Ozone Mapping and Profiler Suite Limb Profiler Data." Journal of Geophysical Research: Atmospheres 125 (4): [10.1029/2019jd031892] [Journal Article/Letter]

2020. "GEOS-S2S Version 2: The GMAO high resolution coupled model and assimilation system for seasonal prediction." Journal of Geophysical Research 125 (5): [10.1029/2019JD031767] [Journal Article/Letter]

2019. "Air Pollution Monitoring for Health Research and Patient Care. An Official American Thoracic Society Workshop Report." Annals of the American Thoracic Society 16 (10): 1207-1214 [10.1513/annalsats.201906-477st] [Journal Article/Letter]

2019. "Global Assimilation of Loon Stratospheric Balloon Observations." Journal of Geophysical Research: Atmospheres 124 (6): 3005-3019 [10.1029/2018jd029673] [Journal Article/Letter]

2018. "Global simulation of tropospheric chemistry at 12.5 km resolution: performance and evaluation of the GEOS-Chem chemical module (v10-1) within the NASA GEOS Earth system model (GEOS-5 ESM)." Geoscientific Model Development 11 (11): 4603-4620 [10.5194/gmd-11-4603-2018] [Journal Article/Letter]

2018. "The roles of climate change and climate variability in the 2017 Atlantic hurricane season." Scientific Reports 8 [10.1038/s41598-018-34343-5] [Journal Article/Letter]

2018. "The impact of SST-forced and unforced teleconnections on 2015/16 El Nino winter precipitation over the western United States." Journal of Climate 31 (15): 5825-5844 [10.1175/JCLI-D-17-0218.1] [Journal Article/Letter]

2018. "Recent decline in extratropical lower stratospheric ozone attributed to circulation changes." Geophysical Research Letters [10.1029/2018gl077406] [Journal Article/Letter]

2018. "Nonlinear response of tropical lower-stratospheric temperature and water vapor to ENSO." Atmospheric Chemistry and Physics 18 (7): 4597-4615 [10.5194/acp-18-4597-2018] [Journal Article/Letter]

2018. "Effects of Greenhouse Gas Increase and Stratospheric Ozone Depletion on Stratospheric Mean Age of Air in 1960-2010." Journal of Geophysical Research: Atmospheres 123 (4): 2098-2110 [10.1002/2017jd027562] [Journal Article/Letter]

2017. "Chemical Mechanisms and Their Applications in the Goddard Earth Observing System (GEOS) Earth System Model." Journal of Advances in Modeling Earth Systems [10.1002/2017ms001011] [Journal Article/Letter]

2017. "Large-Scale Atmospheric Transport in GEOS Replay Simulations." Journal of Advances in Modeling Earth Systems 9 (7): 2545-2560 [10.1002/2017ms001053] [Journal Article/Letter]

2017. "Reanalysis comparisons of upper tropospheric–lower stratospheric jets and multiple tropopauses." Atmospheric Chemistry and Physics 17 (18): 11541-11566 [10.5194/acp-17-11541-2017] [Journal Article/Letter]

2017. "Dynamics of the Disrupted 2015/16 Quasi-Biennial Oscillation." Journal of Climate 30 (15): 5661-5674 [10.1175/jcli-d-16-0663.1] [Journal Article/Letter]

2017. "An evaluation of gravity waves and gravity wave sources in the Southern Hemisphere in a 7 km global climate simulation." Quarterly Journal of the Royal Meteorological Society 143 (707): 2481-2495 [10.1002/qj.3101] [Journal Article/Letter]

2017. "The 2015/2016 El Nino event in context of the MERRA-2 reanalysis: A comparison of the tropical Pacific with 1982/1983 and 1997/1998." Journal of Climate 30 (13): 4819-4842 [10.1175/JCLI-D-16-0800.1] [Journal Article/Letter]

2017. "The Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2)." Journal of Climate 30 5419–5454 [10.1175/jcli-d-16-0758.1] [Journal Article/Letter]

2017. "Evaluation of the Ozone Fields in NASA’s MERRA-2 Reanalysis." Journal of Climate 30 (8): 2961–2988 [10.1175/jcli-d-16-0699.1] [Journal Article/Letter]

2017. "Introduction to the SPARC Reanalysis Intercomparison Project (S-RIP) and overview of the reanalysis systems." Atmospheric Chemistry and Physics 17 (2): 1417-1452 [10.5194/acp-17-1417-2017] [Journal Article/Letter]

2017. "Introduction to the SPARC Reanalysis Intercomparison Project (S-RIP) and overview of the reanalysis systems." Atmospheric Chemistry and Physics 1-52 [10.5194/acp-2016-652] [Journal Article/Letter]

2016. "The anomalous change in the QBO in 2015-16." Geophysical Research Letters 43 [10.1002/2016gl070373] [Journal Article/Letter]

2016. "Tropical waves and the quasi-biennial oscillation in a 7-km global climate simulation." Journal of the Atmospheric Sciences 73 3771–3783 [10.1175/jas-d-15-0350.1] [Journal Article/Letter]

2016. "Challenges and Opportunities in NASA Weather Research." Bulletin of the American Meteorological Society 97 (7): ES137-ES140 [10.1175/bams-d-15-00195.1] [Journal Article/Letter]

2016. "Tropospheric column ozone response to ENSO in GEOS-5 assimilation of OMI and MLS ozone data." Atmos. Chem. Phys. 16 (11): 7091-7103 [10.5194/acp-16-7091-2016] [Journal Article/Letter]

2016. "Impacts of Interactive Stratospheric Chemistry on Antarctic and Southern Ocean Climate Change in the Goddard Earth Observing System - Version 5 (GEOS-5)." Journal of Climate 29 (9): 3199–3218 [10.1175/JCLI-D-15-0572.1] [Journal Article/Letter]

2016. "Structure and Dynamics of the Quasi-Biennial Oscillation in MERRA-2." J. Climate 29:14 5339-5354 [10.1175/jcli-d-15-0809.1] [Journal Article/Letter]

2016. "Isolating the roles of different forcing agents in global stratospheric temperature changes using model integrations with incrementally added single forcings." J. Geophys. Res. Atmos. [10.1002/2015jd023841] [Journal Article/Letter]

2015. "Impact of planetary boundary layer turbulence on model climate and tracer transport." Atmos. Chem. Phys. 15 (13): 7269-7286 [10.5194/acp-15-7269-2015] [Journal Article/Letter]

2015. "Development of a grid-independent GEOS-Chem chemical transport model (v9-02) as an atmospheric chemistry module for Earth system models." Geosci. Model Dev. 8 (3): 595-602 [10.5194/gmd-8-595-2015] [Journal Article/Letter]

2015. "Assessing the magnitude of CO2 flux uncertainty in atmospheric CO2 records using products from NASA's Carbon Monitoring Flux Pilot Project." Journal of Geophysical Research - Atmospheres 120 734-765 [doi:10.1002/2014JD022411] [Journal Article/Letter]

2015. "The Global Structure of Upper Troposphere-Lower Stratosphere Ozone in GEOS-5: A Multi-Year Assimilation of EOS Aura Data." J. Geophys. Res. - Atmos 120 2013-2036 [10.1002/2014JD022493] [Journal Article/Letter]

2014. "Carbon monitoring system flux estimation and attribution: impact of ACOS-GOSAT X CO₂ sampling on the inference of terrestrial biospheric sources and sinks." Tellus B 66 22486 [10.3402/tellusb.v66.22486] [Journal Article/Letter]

2014. "Climatology of Upper Tropospheric–Lower Stratospheric (UTLS) Jets and Tropopauses in MERRA." J. Climate 27 (9): 3248-3271 [10.1175/JCLI-D-13-00243.1] [Journal Article/Letter]

2014. "The major stratospheric sudden warming of January 2013: Analyses and forecasts in the GEOS-5 data assimilation." Mon. Wea. Rev 143 491-510 [10.1175/MWR-D-14-00023.1] [Journal Article/Letter]

2014. "HEMCO v1.0: a versatile, ESMF-compliant component for calculating emissions in atmospheric models." Geoscientific Model Development 7 (4): 1409-1417 [10.5194/gmd-7-1409-2014] [Journal Article/Letter]

2014. "Assessment and applications of NASA ozone data products derived from Aura OMI/MLS satellite measurements in context of the GMI chemical transport model." J. Geophys. Res. Atmos. 119 (9): 5671-5699 [10.1002/2013JD020914] [Journal Article/Letter]

2014. "Satellite data of atmospheric pollution for U.S. air quality applications: Examples of applications, summary of data end-user resources, answers to FAQs, and common mistakes to avoid." Atmospheric Environment 94 647-662 [10.1016/j.atmosenv.2014.05.061] [Journal Article/Letter]

2013. "Detection of carbon monoxide trends in the presence of interannual variability." Journal of Geophysical Research-Atmospheres 118 ( 21): 12257-122 [10.1002/2013JD020258] [Journal Article/Letter]

2013. "On the inclusion of Limb Infrared Monitor of the Stratosphere version 6 ozone in a data assimilation system." J. Geophys. Res. Atmos. 118 (14): 7982-8000 [10.1002/jgrd.50566] [Journal Article/Letter]

2013. "Quantifying the impact of BOReal forest fires on Tropospheric oxidants over the Atlantic using Aircraft and Satellites (BORTAS) experiment: design, execution and science overview." Atmos. Chem. Phys. 13 (13): 6239-6261 [10.5194/acp-13-6239-2013] [Journal Article/Letter]

2013. "Evaluation of a new middle-lower tropospheric CO₂ product using data assimilation." Atmos. Chem. Phys. 13 (9): 4487-4500 [10.5194/acp-13-4487-2013] [Journal Article/Letter]

2012. "Emission and transport of cesium-137 from boreal biomass burning in the summer of 2010." JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 117 [10.1029/2011JD017382] [Journal Article/Letter]

2012. "Seasonal variations of stratospheric age spectra in the Goddard Earth Observing System Chemistry Climate Model (GEOSCCM)." J. Geophys. Res. 117 (D5): D05134 [10.1029/2011JD016877] [Journal Article/Letter]

2012. "The influence of internal model variability in GEOS-5 on interhemispheric CO2 exchange." J. Geophys. Res. 117 (D10): D10107 [10.1029/2011JD017059] [Journal Article/Letter]

2012. "Seasonal variations of stratospheric age spectra in the Goddard Earth Observing System Chemistry Climate Model (GEOSCCM)." J. Geophys. Res 117 10.1029/2011JD016877 [Journal Article/Letter]

2012. "The impact of greenhouse gases on past changes in tropospheric ozone." J Geophys Res 117 (D23): D23304 [10.1029/2012JD018293] [Journal Article/Letter]

2012. "CO2 flux estimation errors associated with moist atmospheric processes." Atmos. Chem. Phys. 12 (14): 6405-6416 [10.5194/acp-12-6405-2012] [Journal Article/Letter]

2011. "Modeling the Frozen-In Anticyclone in the 2005 Arctic Summer Stratosphere." Atmospheric Chemistry and Physics 11 4557-4576 [10.5194/acp-11-4557-2011] [Journal Article/Letter]

2011. "El Niño–Southern Oscillation in Tropical and Midlatitude Column Ozone." J. Atmos. Sci. 68 (9): 1911-1921 [10.1175/JAS-D-11-045.1] [Journal Article/Letter]

2011. "An analysis of the impact of convective parameter sensitivity on simulated global atmospheric CO distributions." J. Geophys. Res. 116 (D21): D21310 [10.1029/2011JD016077] [Journal Article/Letter]

2011. "Improved predictability of the troposphere using stratospheric final warmings." J. Geophys. Res. 116 (D18): D18113 [10.1029/2011JD015914] [Journal Article/Letter]

2011. "MERRA: NASA’s Modern-Era Retrospective Analysis for Research and Applications." J. Climate 24 (14): 3624-3648 [10.1175/JCLI-D-11-00015.1] [Journal Article/Letter]

2011. "The Impact of Stratospheric Ozone Changes on Downward Wave Coupling in the Southern Hemisphere." Journal of Climate 24 (16): 4210-4229 [10.1175/2011JCLI4170.1] [Journal Article/Letter]

2011. "Multimodel climate and variability of the stratosphere." J. Geophys. Res. 116 (D5): D05102 [10.1029/2010JD014995] [Journal Article/Letter]

2011. "Reactive nitrogen, ozone and ozone production in the Arctic troposphere and the impact of stratosphere-troposphere exchange." Atmos. Chem. Phys. 11 (24): 13181-13199 [10.5194/acp-11-13181-2011] [Journal Article/Letter]

2010. "Spatial structure of assimilated ozone in the upper troposphere and lower stratosphere." J. Geophys. Res. 115 (D24): D24316 [10.1029/2010JD013941] [Journal Article/Letter]

2010. "A new interpretation of total column BrO during Arctic spring." Geophysical Research Letters 37 (21): L21805 [10.1029/2010GL043798] [Journal Article/Letter]

2010. "Stratosphere-troposphere coupling and annular mode variability in chemistry-climate models." J. Geophys. Res. 115 (D3): D00M06 [10.1029/2009JD013770] [Journal Article/Letter]

2010. "Multimodel assessment of the upper troposphere and lower stratosphere: Tropics and global trends." J. Geophys. Res. 115 (D3): D00M08 [10.1029/2009JD013638] [Journal Article/Letter]

2010. "The potential to narrow uncertainty in projections of stratospheric ozone over the 21st century." Atmos. Chem. Phys. 10 (19): 9473-9486 [10.5194/acp-10-9473-2010] [Journal Article/Letter]

2010. "Five year (2004–2009) observations of upper tropospheric water vapor and cloud ice from MLS and comparisons with GEOS-5 analyses." J. Geophys. Res. 115 (D15): D15103 [10.1029/2009JD013256] [Journal Article/Letter]

2010. "Chemistry–Climate Model Simulations of Twenty-First Century Stratospheric Climate and Circulation Changes." J. Climate 23 (20): 5349-5374 [10.1175/2010JCLI3404.1] [Journal Article/Letter]

2010. "Narrowing of the upwelling branch of the Brewer-Dobson circulation and Hadley cell in chemistry-climate model simulations of the 21st century." Geophys. Res. Lett 37 [Journal Article/Letter]

2010. "Relative Contribution of Greenhouse Gases and Ozone-Depleting Substances to Temperature Trends in the Stratosphere: A Chemistry–Climate Model Study." Journal of Climate 23 (1): 28-42 [10.1175/2009JCLI2955.1] [Journal Article/Letter]

2010. "Multi-model assessment of stratospheric ozone return dates and ozone recovery in CCMVal-2 models." Atmos. Chem. Phys. 10 (19): 9451-9472 [10.5194/acp-10-9451-2010] [Journal Article/Letter]

2010. "Sensitivity of 21st century stratospheric ozone to greenhouse gas scenarios." Geophys Res Lett 37 (16): L16807 [10.1029/2010GL044443] [Journal Article/Letter]

2010. "Decline and recovery of total column ozone using a multimodel time series analysis." J Geophys Res 115 (D3): D00M10 [10.1029/2010JD013857] [Journal Article/Letter]

2010. "Narrowing of the upwelling branch of the Brewer-Dobson circulation and Hadley cell in chemistry-climate model simulations of the 21st century." Geophys Res Lett 37 (13): L13702 [10.1029/2010GL043718] [Journal Article/Letter]

2010. "Influence of the 2006 Indonesian biomass burning aerosols on tropical dynamics studied with the GEOS-5 AGCM." J Geophys Res 115 (D14): D14121 [10.1029/2009JD013181] [Journal Article/Letter]

2009. "Aura Microwave Limb Sounder Observations of Dynamics and Transport During the Record-breaking 2009 Arctic Stratospheric Major Warming." Geophys Res Lett 36 (12): L12815 [10.1029/2009GL038586] [Journal Article/Letter]

2009. "Error correlation between CO₂ and CO as constraint for CO₂ flux inversions using satellite data." Atmos. Chem. Phys. 9 (19): 7313-7323 [10.5194/acp-9-7313-2009] [Journal Article/Letter]

2009. "Assimilation of SCIAMACHY total column CO observations: Global and regional analysis of data impact." J. Geophys. Res. 114 (D7): D07307 [10.1029/2008JD010781] [Journal Article/Letter]

2009. "Aura Microwave Limb Sounder observations of dynamics and transport during the record-breaking 2009 Arctic stratospheric major warming." Geophys. Res. Lett. 36 (12): L12815 [10.1029/2009GL038586] [Journal Article/Letter]

2009. "Chemical Source Inversion Using Assimilated Constituent Observations in an Idealized Two-Dimensional System." Mon. Weather Rev. 137 (9): 3013-3025 [10.1175/2009MWR2775.1] [Journal Article/Letter]

2009. "Analysis of Convective Transport and Parameter Sensitivity in a Single Column Version of the Goddard Earth Observation System, Version 5, General Circulation Model." J. Atmos. Sci. 66 (3): 627-646 [10.1175/2008JAS2694.1] [Journal Article/Letter]

2009. "Impacts of climate change on stratospheric ozone recovery." Geophysical Research Letters 36 (3): L03805 [10.1029/2008GL036223] [Journal Article/Letter]

2009. "What would have happened to the ozone layer if chlorofluorocarbons (CFCs) had not been regulated?." Atmos. Chem. Phys. 9 (6): 2113-2128 [10.5194/acp-9-2113-2009] [Journal Article/Letter]

2009. "Effect of zonal asymmetries in stratospheric ozone on simulated Southern Hemisphere climate trends." Geophys Res Lett 36 (18): L18701 [10.1029/2009GL040419] [Journal Article/Letter]

2009. "Intra-annual relationships between polar ozone and the SAM." Geophysical Research Letters 36 (4): L04707 [10.1029/2008GL036627] [Journal Article/Letter]

2009. "On the influence of anthropogenic forcings on changes in the stratospheric mean age." J. Geophys. Res. 114 (D3): D03105 [10.1029/2008JD010378] [Journal Article/Letter]

2008. "Interannual Variability and Trends of Extratropical Ozone. Part II: Southern Hemisphere." J. Atmos. Sci. 65 (10): 3030-3041 [10.1175/2008JAS2793.1] [Journal Article/Letter]

2008. "Impact of stratospheric ozone hole recovery on Antarctic climate." Geophysical Research Letters 35 (8): L08714 [10.1029/2008GL033317] [Journal Article/Letter]

2008. "The Impact of Stratospheric Ozone Recovery on the Southern Hemisphere Westerly Jet." Science 320 (5882): 1486-1489 [10.1126/science.1155939] [Journal Article/Letter]

2008. "Validation of the Aura Microwave Limb Sounder temperature and geopotential height measurements." J. Geophys. Res. 113 (D15): D15S11 [10.1029/2007JD008783] [Journal Article/Letter]

2008. "Interannual Variability and Trends of Extratropical Ozone. Part I: Northern Hemisphere." Journal of the Atmospheric Sciences 65 (10): 3013-3029 [10.1175/2008JAS2665.1] [Journal Article/Letter]

2008. "The evolution of the stratopause during the 2006 major warming: Satellite data and assimilated meteorological analyses." J. Geophys. Res. 113 (D11): D11115 [10.1029/2007JD009097] [Journal Article/Letter]

2008. "Goddard Earth Observing System chemistry-climate model simulations of stratospheric ozone-temperature coupling between 1950 and 2005." J. Geophys. Res 113 [Journal Article/Letter]

2008. "Assimilated Ozone from EOS-Aura: Evaluation of the Tropopause Region and Tropospheric Columns." J. Geophys. Res.-Atmos. 113 D15S32 [doi:10.1029/2007JD008863] [Journal Article/Letter]

2008. "Understanding the Changes of Stratospheric Water Vapor in Coupled Chemistry–Climate Model Simulations." Journal of the Atmospheric Sciences 65 (10): 3278-3291 [10.1175/2008JAS2696.1] [Journal Article/Letter]

2008. "Goddard Earth Observing System chemistry-climate model simulations of stratospheric ozone temperature coupling between 1950 and 2005." J Geophy Res Atmos 113 (D12, D12103, doi:10): [Journal Article/Letter]

2007. "Stratospheric gravity wave simulation over Greenland during 24 January 2005." J. Geophys. Res. 112 (D10): D10115 [10.1029/2006JD007823] [Journal Article/Letter]

2007. "Precision requirements for space-based XCO₂ data." J. Geophys. Res. 112 (D10): D10314 [10.1029/2006JD007659] [Journal Article/Letter]

2007. "Solar occultation satellite data and derived meteorological products: Sampling issues and comparisons with Aura Microwave Limb Sounder." J. Geophys. Res. 112 (D24): D24S50 [10.1029/2007JD008709] [Journal Article/Letter]

2007. "Stratospheric transport using 6-h-averaged winds from a data assimilation system." J. Geophys. Res. 112 (D23): D23103 [10.1029/2006JD007673] [Journal Article/Letter]

2007. "Ice polar stratospheric clouds detected from assimilation of Atmospheric Infrared Sounder data." Geophys. Res. Lett 34 (16): L16802 [10.1029/2007GL029415] [Journal Article/Letter]

2007. "Multimodel projections of stratospheric ozone in the 21st century." J. Geophys. Res. 112 (D16): D16303 [10.1029/2006JD008332] [Journal Article/Letter]

2007. "A New Look at Stratospheric Sudden Warmings. Part II: Evaluation of Numerical Model Simulations." J. Climate 20 (3): 470-488 [10.1175/JCLI3994.1] [Journal Article/Letter]

2007. "Stratospheric transport using 6-h-averaged winds from a data assimilation system." J Geophys Res 112 (D23103): 1-12 [Journal Article/Letter]

2006. "An ozone increase in the Antarctic summer stratosphere: A dynamical response to the ozone hole." Geophys Res Lett 33 L21805 [10.1029/2006GL026820] [Journal Article/Letter]

2006. "A test of sensitivity to convective transport in a global atmospheric CO2 simulation." Tellus B 58 (5): 463-475 [10.1111/j.1600-0889.2006.00212.x] [Journal Article/Letter]

2006. "Assimilation of ozone profiles from the Improved Limb Atmospheric Spectrometer-II: Study of Antarctic ozone." JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 111 (D11): [10.1029/2005JD006448] [Journal Article/Letter]

2006. "Alaskan and Canadian forest fires exacerbate ozone pollution over Houston, Texas, on 19 and 20 July 2004." J. Geophys. Res. 111 (D24): D24S03 [10.1029/2006JD007090] [Journal Article/Letter]

2006. "Trends in Stratospheric Ozone: Lessons Learned from a 3D Chemical Transport Model." J. Atmos. Sci. 63 (3): 1028-1041 [10.1175/JAS3650.1] [Journal Article/Letter]

2006. "Construction and application of covariance functions with variable length-fields." Q.J.R. Meteorol. Soc. 132 (619): 1815-1838 [10.1256/qj.05.08] [Journal Article/Letter]

2006. "Assessment of temperature, trace species, and ozone in chemistry-climate model simulations of the recent past." J. Geophys. Res. 111 (D22): D22308 [10.1029/2006JD007327] [Journal Article/Letter]

2006. "Trends in stratospheric ozone: Lessons learned from a 3-D chemical transport model." J Atmos Sc 63 1028-1041 [Journal Article/Letter]

2005. "Assimilation of ozone data from the Michelson Interferometer for Passive Atmospheric Sounding." QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY 131 (611): [10.1256/qj.04.184] [Journal Article/Letter]

2005. "A strategy for process-oriented validation of coupled chemistry-climate models." B. Amer. Met. Soc 86 (8): 1117-1133 [10.1175/BAMS-86-8-1117] [Journal Article/Letter]

2005. "Diagnostic Comparison of Meteorological Analyses during the 2002 Antarctic Winter." Mon. Weather Rev. 133 (5): 1261-1278 [10.1175/MWR2926.1] [Journal Article/Letter]

2005. "Simulations of Dynamics and Transport during the September 2002 Antarctic Major Warming." J. Atmos. Sci. 62 (3): 690-707 [10.1175/JAS-3313.1] [Journal Article/Letter]

2005. "EOS Microwave Limb Sounder observations of the Antarctic polar vortex breakup in 2004." Geophysical Research Letters 32 (12): L12811 [10.1029/2005GL022823] [Journal Article/Letter]

2005. "The remarkable 2003–2004 winter and other recent warm winters in the Arctic stratosphere since the late 1990s." J. Geophys. Res. 110 (D4): D04107 [10.1029/2004JD005367] [Journal Article/Letter]

2004. "Interannual variability of stratospheric trace gases: The role of extratropical wave driving." Q. J. R. Meteorol. Soc. 130 (602): 2459-2474 [10.1256/qj.04.28] [Journal Article/Letter]

2004. "Use of radon for evaluation of atmospheric transport models: sensitivity to emissions." Tellus B 56 (5): 404-412 [10.1111/j.1600-0889.2004.00124.x] [Journal Article/Letter]

2004. "The Orbiting Carbon Observatory (OCO) Mission." Adv. Space Res. 34 700-703 [Manuscript No. A1.2-0007-02] [Journal Article/Letter]

2004. "The SPARC Intercomparison of Middle-Atmosphere Climatologies." J. Climate 17 (5): 986-1003 [10.1175/1520-0442(2004)017<0986:TSIOMC>2.0.CO;2] [Journal Article/Letter]

2004. "A case study of excessive subtropical transport in the stratosphere of a data assimilation system." J. Geophys. Res. 109 (D11): D11102 [10.1029/2003JD004057] [Journal Article/Letter]

2004. "Monitoring of observation errors in the assimilation of satellite ozone data." J. Geophys. Res. 109 (D6): D06309 [10.1029/2003JD004118] [Journal Article/Letter]

2004. "Use of radon for evaluation of atmospheric transport models: sensitivity to emissions." Tellus Ser B - Chem and Phys. Meteor 56 404-412 [Journal Article/Letter]

2004. "Global CO₂ transport simulations using meteorological data from the NASA data assimilation system." J. Geophys. Res. 109 (D18): D18312 [10.1029/2004JD004554] [Journal Article/Letter]

2004. "Interannual variability of stratospheric trace gases: The role of extratropical wave driving." Met. Soc 130 2459-2474 [Journal Article/Letter]

2003. "High-Frequency Planetary Waves in the Polar Middle Atmosphere as Seen in a Data Assimilation System." J. Atmos. Sci. 60 (24): 2975-2992 [10.1175/1520-0469(2003)060<2975:HPWITP>2.0.CO;2] [Journal Article/Letter]

2003. "Tropical Cumulus Convection and Upward-Propagating Waves in Middle-Atmospheric GCMs." J. Atmos. Sci. 60 (22): 2765-2782 [10.1175/1520-0469(2003)060<2765:TCCAUW>2.0.CO;2] [Journal Article/Letter]

2003. "A comparison of the lower stratospheric age spectra derived from a general circulation model and two data assimilation systems." J. Geophys. Res. 108 (D3): 4113 [10.1029/2002JD002652] [Journal Article/Letter]

2003. "Evaluation of transport in the lower tropical stratosphere in a global chemistry and transport model." J. Geophys. Res. 108 (D9): 4259 [10.1029/2002JD002696] [Journal Article/Letter]

2003. "Uncertainties and assessments of chemistry-climate models of the stratosphere." Atmos. Chem. Phys. 3 (1): 1-27 [10.5194/acp-3-1-2003] [Journal Article/Letter]

2001. "The tropical upper troposphere and lower stratosphere in the GEOS-2 GCM." Advances in Space Research 27 (8): 1457-1465 [10.1016/s0273-1177(01)00214-9] [Journal Article/Letter]

2000. "The GCM-Reality Intercomparison Project for SPARC (GRIPS): Scientific issues and initial results." Bull Amer Meteorol Soc 81 781-796. [Journal Article/Letter]

1999. "Persistence of the Lower Stratospheric Polar Vortices." J. Geophys. Res 104 [Journal Article/Letter]

Non-Refereed

2020. "Transition to the RRTMG Shortwave Radiation Code in GEOS Models." Goddard Modeling and Assimilation Office (GMAO) Research Brief [Full Text] [Report]

2015. "MERRA-2: Initial Evaluation of the Climate." NASA Technical Report Series on Global Modeling and Data Assimilation 43 (NASA/TM–2015–10) 139 pp. [Report]

2015. "Evaluation of the 7-km GEOS-5 Nature Run." NASA Technical Report Series on Global Modeling and Data Assimilation 36 (NASA/TM-2014-104606): [Report]