Sciences and Exploration Directorate

Kostas Tsigaridis

(RESEARCH SCIENTIST)

Kostas Tsigaridis's Contact Card & Information.
Email: kostas.tsigaridis@nasa.gov
Phone: 212.678.5668
Org Code: 611
Address:
NASA/GISS
Mail Code 611
New York, NY 10025
Employer: TRUSTEES OF COLUMBIA UNIVERSITY

Brief Bio


My research interests aim in understanding the role aerosols play in the Earth system, by studying the interactions and feedbacks between the atmosphere, the terrestrial biosphere, the ocean, and climate.

I am currently working on a variety of topics related to aerosol research and their sources, sinks, and interactions with climate at various levels of complexity. My studies range from detailed aerosol processes such as the formation of secondary organic aerosols (SOA), to centennial time scale climate variability related to natural variability and external forcings. While my main expertise is organic aerosols, I am also experienced in working with all other aerosol types as well as tropospheric gas-phase and heterogeneous chemistry. I have extensively used both box models that I developed, and 3-dimensional global models: the TM3 chemistry/transport model, the IPSL general circulation model LMDz-INCA, and the GISS modelE Earth System Model (ESM), for which I had contributed to the IPCC AR5 model development. Currently I am working with the next generation of the NASA GISS ESM, the GISS ModelE2, which is part of CMIP5.

Topics that I either work on, or plan to work in the future include studies on:
  • missing aerosol species and sources, such as the primary oceanic aerosols and their importance on the remote marine atmosphere, the in-cloud and aerosol water aqueous formation of organic aerosols that can lead to brown carbon formation, the primary terrestrial biological particles, and the organic nitrogen
  • missing aerosol parameterizations, such as the effect of aerosol mixing on cloud condensation nuclei and aerosol absorption, the semi-volatility of primary organic aerosols, the importance of in-canopy processes on natural terrestrial aerosol and aerosol precursor sources, and the mineral dust iron solubility and bioavailability
  • the change of aerosol burden and its spatiotemporal distribution, especially with regard to its role and importance on gas-phase chemistry via photolysis rates changes and heterogeneous reactions in the atmosphere, as well as their effect on key gas-phase species like ozone
  • the physical and optical properties of aerosols, which affect aerosol transport, lifetime, and light scattering and absorption, with the latter being very sensitive to the vertical distribution of absorbing aerosols
  • aerosol-cloud interactions, which include cloud activation, the aerosol indirect effect and the impact of clouds on aerosol removal
  • changes on climate and feedbacks related with all these topics

In order to understand the climate system as a whole, improve the aerosol representation in the GISS ModelE2 and contribute to future IPCC climate change assessments and CMIP activities, I am also interested in understanding the importance of natural and anthropogenic aerosol changes in the atmosphere on the terrestrial biosphere, the ocean and climate. The climate feedbacks involved with these changes, which are key in understanding the climate system as a whole, include:

the importance of aerosol absorption on climate
the impact of aerosol deposition which affects biology and, hence, emissions of aerosols and aerosol precursors via organic nitrogen, organic phosphorus and iron fertilization
the importance of land use and land use changes on natural and anthropogenic aerosol sources
the SOA sources and impact on climate, with special attention on the impact human activities have on natural SOA formation

In order to quantitatively answer such questions I perform simulations of the past, present and future atmospheres, and make comparisons with measurements and remote sensing data, all of which help understand, evaluate and improve the model’s parameterizations and performance, and our understanding of the Earth system.

Education


  • Sep 1993 – Feb 1998: University Degree in Chemistry, Department of Chemistry, University of Crete.
  • Jun 1996 – Jul 1997: Diploma Thesis in Environmental Chemical Processes Laboratory (ECPL), Department of Chemistry, University of Crete. Title: Study of the anionic composition and its seasonal variation in rainwater of remote marine areas. Supervisor: N. Mihalopoulos.
  • Feb 1998 – Dec 2000: Master Thesis in Environmental Science and Engineering, Department of Chemistry, University of Crete. Title: Arithmetic simulation of the impact of biogenic hydrocarbons on the chemical composition of the atmosphere: The forest of Pertouli, Trikala, Greece. Supervisor: M. Kanakidou.
  • Dec 2000 – Dec 2003: Ph.D. in Environmental Science and Engineering, Department of Chemistry, University of Crete. Title: Simulation of the effect of organic aerosols on the atmosphere and its energy balance with the use of a 3D model. Supervisor: M. Kanakidou.
  • Mar 2004 – Dec 2004: Military service in the Greek Navy. Rank: petty officer.
Languages: Greek (mother tongue), English (fluent), French (basic).

Positions/Employment


Postdoctoral Fellow

Department of Chemistry, University of Crete - Environmental Chemical Processes Laboratory

December 2003 - December 2005



Postdoctoral fellow

Laboratory CEA-CNRS-UVSQ - LSCE/IPSL

January 2006 - February 2008



Postdoctoral fellow

Oak Ridge Associated Universities - NASA Goddard Institute for Space Studies

March 2008 - February 2010

NPP fellow


Associate research scientist

Columbia University - Center for Climate Systems Research, Columbia University and NASA Goddard Institute for Space Studies

March 2010 - June 2016


Research scientist

Columbia University - Center for Climate Systems Research, Columbia University and NASA Goddard Institute for Space Studies

July 2016 - Present

Teaching Experience


Teaching assistant
  • Feb. 1998 – Jun. 1998: Analytical Chemistry II Laboratory, Department of Chemistry, University of Crete.
  • Feb. 1998 – Jun. 1998: Computational Environmental Chemistry course, Department of Chemistry, University of Crete.
  • Oct. 1998 – Jan. 1999: General Chemistry I Laboratory, Department of Chemistry, University of Crete.
  • Feb. 1999 – Jun. 1999: Computational Environmental Chemistry course, Department of Chemistry, University of Crete.
  • Oct. 1999 – Jan. 2000: Computational Chemistry course, Department of Chemistry, University of Crete.
Guest lecturer
  • Nov. 2010: Atmospheric Aerosols course, Department of Chemical Engineering, Columbia University.
  • Oct. 2011: Atmospheric Aerosols course, Department of Chemical Engineering, Columbia University.
  • Oct. 2011: Atmospheric Aerosols course, Department of Chemical Engineering, Columbia University.
Master students
  • Kenneth Sinclair, Columbia University, Sep. 2011 – Sep. 2012.
PhD students
  • Chloe Gao, Columbia University, Sep. 2013 – today.
  • Keren Mezuman, Columbia University, Sep. 2013 – today.

Professional Societies


American Geophysical Union (AGU)

2008 - Present


European Geophysical Union (EGU)

2013 - Present

Professional Service


  • Leader of the organic aerosol global modeling intercomparison exercise in the framework of AeroCom (http://aerocom.met.no).
  • Co-organizer of the international workshop entitled “Production mechanism, number concentration, size distribution, chemical composition, and optical properties of sea spray aerosols”, 4-6 June 2012, Raleigh, NC, USA.
  • Member of the scientific committee of the 12th International Conference on Meteorology, Climatology and Atmospheric Physics (COMECAP), 28-31 May 2014, Heraklion, Greece.
  • co-editor in Atmospheric Chemistry and Physics since 2013.
  • co-editor in Dataset Papers in Geosciences since 2012.
  • co-editor in International Journal of Atmospheric Sciences since 2012.

Awards


  • 1998 – 2000: Master Thesis supported by the EPEAEK grant on Environmental Sciences and Engineering, University of Crete, Heraklion, Greece.
  • 2004 – 2005: Post-doctoral PYTHAGORAS II grant on “Study of the relative contribution of the natural variability and the anthropogenic influence on the levels and the climate role of aerosols and ozone over the East Mediterranean and on a global scale”, University of Crete, Heraklion, Greece.
  • 2008 – 2009: NASA Postdoctoral Program (NPP) fellowship, as a result of a successful proposal, NASA GISS, New York, USA.

Publications


Refereed

2024. "Influence of More Mechanistic Representation of Particle Dry Deposition on 1850–2000 Changes in Global Aerosol Burdens and Radiative Forcing." Journal of Advances in Modeling Earth Systems 16 (3): [10.1029/2023ms003952] [Journal Article/Letter]

2023. "The impact of ENSO and NAO initial conditions and anomalies on the modeled response to Pinatubo-sized volcanic forcing." Atmospheric Chemistry and Physics 23 (24): 15491-15505 [10.5194/acp-23-15491-2023] [Journal Article/Letter]

2023. "Severe global cooling after volcanic super-eruptions? The answer hinges on unknown aerosol size." Journal of Climate [10.1175/jcli-d-23-0116.1] [Journal Article/Letter]

2023. "Arctic Tropospheric Ozone Trends." Geophysical Research Letters 50 (22): [10.1029/2023gl103096] [Journal Article/Letter]

2023. "The Regional Aerosol Model Intercomparison Project (RAMIP)." Geoscientific Model Development 16 (15): 4451-4479 [10.5194/gmd-16-4451-2023] [Journal Article/Letter]

2023. "Comparison between ozone column depths and methane lifetimes computed by one- and three-dimensional models at different atmospheric O 2 levels." Royal Society Open Science 10 (5): [10.1098/rsos.230056] [Journal Article/Letter]

2023. "Emissions Background, Climate, and Season Determine the Impacts of Past and Future Pandemic Lockdowns on Atmospheric Composition and Climate." Earth's Future 11 (5): [10.1029/2022ef002959] [Journal Article/Letter]

2023. "The Impact of Background ENSO and NAO Conditions and Anomalies on the Modeled Response to Pinatubo-Sized Volcanic Forcing." [10.5194/acp-2023-54] [Journal Article/Letter]

2023. "Investigating hydroclimatic impacts of the 168–158 BCE volcanic quartet and their relevance to the Nile River basin and Egyptian history." Climate of the Past 19 (1): 249-275 [10.5194/cp-19-249-2023] [Journal Article/Letter]

2023. "Arctic tropospheric ozone: assessment of current knowledge and model performance." Atmospheric Chemistry and Physics 23 (1): 637-661 [10.5194/acp-23-637-2023] [Journal Article/Letter]

2023. "Present-day and future PM2.5 and O3-related global and regional premature mortality in the EVAv6.0 health impact assessment model." Environmental Research 216 114702 [10.1016/j.envres.2022.114702] [Journal Article/Letter]

2022. "Understanding Model‐Observation Discrepancies in Satellite Retrievals of Atmospheric Temperature Using GISS ModelE." Journal of Geophysical Research: Atmospheres 128 (1): [10.1029/2022jd037523] [Journal Article/Letter]

2022. "The Turning Point of the Aerosol Era." Journal of Advances in Modeling Earth Systems 14 (12): [10.1029/2022ms003070] [Journal Article/Letter]

2022. "Interactive biogenic emissions and drought stress effects on atmospheric composition in NASA GISS ModelE." Atmospheric Chemistry and Physics 22 (20): 13303-13323 [10.5194/acp-22-13303-2022] [Journal Article/Letter]

2022. "Using modelled relationships and satellite observations to attribute modelled aerosol biases over biomass burning regions." Nature Communications 13 (1): 5914 [10.1038/s41467-022-33680-4] [Journal Article/Letter]

2022. "Clean air policies are key for successfully mitigating Arctic warming." Communications Earth & Environment 3 (1): 222 [10.1038/s43247-022-00555-x] [Journal Article/Letter]

2022. "The ozone–climate penalty over South America and Africa by 2100." Atmospheric Chemistry and Physics 22 (18): 12331-12352 [10.5194/acp-22-12331-2022] [Journal Article/Letter]

2022. "The TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI). I. Dry Cases—The Fellowship of the GCMs." The Planetary Science Journal 3 (9): 211 [10.3847/psj/ac6cf0] [Journal Article/Letter]

2022. "The TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI). III. Simulated Observables—the Return of the Spectrum." The Planetary Science Journal 3 (9): 213 [10.3847/psj/ac6cf1] [Journal Article/Letter]

2022. "Satellite-based evaluation of AeroCom model bias in biomass burning regions." Atmospheric Chemistry and Physics 22 (17): 11009-11032 [10.5194/acp-22-11009-2022] [Journal Article/Letter]

2022. "Use of Machine Learning to Reduce Uncertainties in Particle Number Concentration and Aerosol Indirect Radiative Forcing Predicted by Climate Models." Geophysical Research Letters 49 (16): [10.1029/2022gl098551] [Journal Article/Letter]

2022. "Attribution of Stratospheric and Tropospheric Ozone Changes Between 1850 and 2014 in CMIP6 Models." Journal of Geophysical Research: Atmospheres 127 (16): [10.1029/2022jd036452] [Journal Article/Letter]

2022. "Changes in anthropogenic precursor emissions drive shifts in the ozone seasonal cycle throughout the northern midlatitude troposphere." Atmospheric Chemistry and Physics 22 (5): 3507-3524 [10.5194/acp-22-3507-2022] [Journal Article/Letter]

2022. "Investigating hydroclimatic impacts of the 168–158 BCE volcanic quartet and their relevance to the Nile River basin and Egyptian history." Climate of the Past [10.5194/cp-2022-25] [Journal Article/Letter]

2022. "Future Climate Change under SSP Emission Scenarios with GISS‐E2.1." Journal of Advances in Modeling Earth Systems [10.1029/2021ms002871] [Journal Article/Letter]

2022. "Climate change penalty and benefit on surface ozone: a global perspective based on CMIP6 earth system models." Environmental Research Letters 17 (2): 024014 [10.1088/1748-9326/ac4a34] [Journal Article/Letter]

2022. "Effects of forcing differences and initial conditions on inter-model agreement in the VolMIP volc-pinatubo-full experiment." Geoscience Model Development [10.5194/gmd-2021-372] [Journal Article/Letter]

2021. "Changes in satellite retrievals of atmospheric composition over eastern China during the 2020 COVID-19 lockdowns." Atmospheric Chemistry and Physics 21 18333–18350 [10.5194/acp-2020-567] [Journal Article/Letter]

2021. "Changes in biomass burning, wetland extent, or agriculture drive atmospheric NH3 trends in select African regions." Atmospheric Chemistry and Physics 21 16277-16291 [10.5194/acp-21-16277-2021] [Journal Article/Letter]

2021. "Aerosol absorption in global models from AeroCom phase III." Atmospheric Chemistry and Physics 21 (20): 15929-15947 [10.5194/acp-21-15929-2021] [Journal Article/Letter]

2021. "Understanding Top‐of‐Atmosphere Flux Bias in the AeroCom Phase III Models: A Clear‐Sky Perspective." Journal of Advances in Modeling Earth Systems 13 (9): [10.1029/2021ms002584] [Journal Article/Letter]

2021. "Continental and Ecoregion‐Specific Drivers of Atmospheric NO2 and NH3 Seasonality Over Africa Revealed by Satellite Observations." Global Biogeochemical Cycles 35 (8): e2020GB006916 [10.1029/2020gb006916] [Journal Article/Letter]

2021. "Present and future aerosol impacts on Arctic climate change in the GISS-E2.1 Earth system model." Atmospheric Chemistry and Physics 21 (13): 10413-10438 [10.5194/acp-21-10413-2021] [Journal Article/Letter]

2021. "3D Simulations of the Early Martian Hydrological Cycle Mediated by a H 2 ‐CO 2 Greenhouse." Journal of Geophysical Research: Planets 126 (7): [10.1029/2021je006825] [Journal Article/Letter]

2021. "Investigations on the anthropogenic reversal of the natural ozone gradient between northern and southern midlatitudes." Atmospheric Chemistry and Physics 21 (12): 9669-9679 [10.5194/acp-21-9669-2021] [Journal Article/Letter]

2021. "TRAPPIST Habitable Atmosphere Intercomparison (THAI) Workshop Report." The Planetary Science Journal 2 (3): 106 [10.3847/psj/abf4df] [Journal Article/Letter]

2021. "Chemical transport models often underestimate inorganic aerosol acidity in remote regions of the atmosphere." Communications Earth & Environment 2 (1): 93 [10.1038/s43247-021-00164-0] [Journal Article/Letter]

2021. "The Toba supervolcano eruption caused severe tropical stratospheric ozone depletion." Communications Earth & Environment 2 (1): 71 [10.1038/s43247-021-00141-7] [Journal Article/Letter]

2021. "The Climate Response to Emissions Reductions due to COVID‐19: Initial Results from CovidMIP." Geophysical Research Letters 48 e2020GL091883 [10.1029/2020gl091883] [Journal Article/Letter]

2021. "Intercomparison of the representations of the atmospheric chemistry of pre-industrial methane and ozone in earth system and other global chemistry-transport models." Atmospheric Environment 248 118248 [10.1016/j.atmosenv.2021.118248] [Journal Article/Letter]

2021. "Reductions in NO2 burden over north equatorial Africa from decline in biomass burning in spite of growing fossil fuel use, 2005 to 2017." Proceedings of the National Academy of Sciences 118 (7): e2002579118 [10.1073/pnas.2002579118] [Journal Article/Letter]

2021. "Significant climate benefits from near-term climate forcer mitigation in spite of aerosol reductions." Environmental Research Letters [10.1088/1748-9326/abe06b] [Journal Article/Letter]

2021. "Climate-driven chemistry and aerosol feedbacks in CMIP6 Earth system models." Atmospheric Chemistry and Physics 21 (2): 1105-1126 [10.5194/acp-21-1105-2021] [Journal Article/Letter]

2021. "AeroCom phase III multi-model evaluation of the aerosol life cycle and optical properties using ground- and space-based remote sensing as well as surface in situ observations." Atmospheric Chemistry and Physics 21 (1): 87-128 [10.5194/acp-21-87-2021] [Journal Article/Letter]

2021. "CMIP6 Historical Simulations (1850‐2014) with GISS‐E2.1." Journal of Advances in Modeling Earth Systems 13 e2019MS002034 [10.1029/2019ms002034] [Journal Article/Letter]

2020. "GISS Model E2.2: A Climate Model Optimized for the Middle Atmosphere—2. Validation of Large‐Scale Transport and Evaluation of Climate Response." Journal of Geophysical Research: Atmospheres 125 (24): [10.1029/2020jd033151] [Journal Article/Letter]

2020. "Historical and future changes in air pollutants from CMIP6 models." Atmospheric Chemistry and Physics 20 (23): 14547-14579 [10.5194/acp-20-14547-2020] [Journal Article/Letter]

2020. "Changes in biomass burning, wetland extent, or agriculture drive atmospheric NH3 trends in several African regions." Atmospheric Chemistry and Physics Discussions [10.5194/acp-2020-945] [Journal Article/Letter]

2020. "Reappraisal of the Climate Impacts of Ozone‐Depleting Substances." Geophysical Research Letters 47 (20): [10.1029/2020gl088295] [Journal Article/Letter]

2020. "Climate and air quality impacts due to mitigation of non-methane near-term climate forcers." Atmospheric Chemistry and Physics 20 (16): 9641-9663 [10.5194/acp-20-9641-2020] [Journal Article/Letter]

2020. "GISS‐E2.1: Configurations and Climatology." Journal of Advances in Modeling Earth Systems 12 (8): [10.1029/2019ms002025] [Journal Article/Letter]

2020. "Historical (1850–2014) Aerosol Evolution and Role on Climate Forcing Using the GISS ModelE2.1 Contribution to CMIP6." Journal of Advances in Modeling Earth Systems 12 (8): [10.1029/2019ms001978] [Journal Article/Letter]

2020. "Fast responses on pre-industrial climate from present-day aerosols in a CMIP6 multi-model study." Atmospheric Chemistry and Physics 20 (14): 8381-8404 [10.5194/acp-20-8381-2020] [Journal Article/Letter]

2020. "The interactive global fire module pyrE (v1.0)." Geoscientific Model Development 13 (7): 3091-3118 [10.5194/gmd-13-3091-2020] [Journal Article/Letter]

2020. "Black Carbon and Precipitation: An Energetics Perspective." Journal of Geophysical Research: Atmospheres 125 (13): [10.1029/2019jd032239] [Journal Article/Letter]

2020. "Characterization of organic aerosol across the global remote troposphere: a comparison of ATom measurements and global chemistry models." Atmospheric Chemistry and Physics 20 (8): 4607-4635 [10.5194/acp-20-4607-2020] [Journal Article/Letter]

2020. "TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI): motivations and protocol version 1.0." Geoscientific Model Development 13 (2): 707-716 [10.5194/gmd-13-707-2020] [Journal Article/Letter]

2020. "The Role of the SO Radiative Effect in Sustaining the Volcanic Winter and Soothing the Toba Impact on Climate." Journal of Geophysical Research: Atmospheres 125 (2): [10.1029/2019jd031726] [Journal Article/Letter]

2019. "Asian and Trans‐Pacific Dust: A Multimodel and Multiremote Sensing Observation Analysis." Journal of Geophysical Research: Atmospheres 2019JD030822 [10.1029/2019jd030822] [Journal Article/Letter]

2018. "Multi-model comparison of the volcanic sulfate deposition from the 1815 eruption of Mt. Tambora." Atmospheric Chemistry and Physics 18 (3): 2307-2328 [10.5194/acp-18-2307-2018] [Journal Article/Letter]

2017. "Investigation of global particulate nitrate from the AeroCom phase III experiment." Atmospheric Chemistry and Physics 17 (21): 12911-12940 [10.5194/acp-17-12911-2017] [Journal Article/Letter]

2017. "Resolving Orbital and Climate Keys of Earth and Extraterrestrial Environments with Dynamics (ROCKE-3D) 1.0: A General Circulation Model for Simulating the Climates of Rocky Planets." The Astrophysical Journal Supplement Series 231 (1): 12 [10.3847/1538-4365/aa7a06] [Journal Article/Letter]

2017. "Interactive nature of climate change and aerosol forcing." Journal of Geophysical Research: Atmospheres 122 (6): 3457-3480 [10.1002/2016jd025809] [Journal Article/Letter]

2016. "AUTH Regional Climate Model Contributions to EURO-CORDEX." Springer Atmospheric Sciences 741-746 [10.1007/978-3-319-35095-0_106] [Article in Book]

2016. "Evaluating secondary inorganic aerosols in three dimensions." Atmos. Chem. Phys. 16 (16): 10651-10669 [10.5194/acp-16-10651-2016] [Journal Article/Letter]

2016. "Role of atmospheric chemistry in the climate impacts of stratospheric volcanic injections." Nature Geoscience [10.1038/ngeo2771] [Journal Article/Letter]

2016. "Regional and global temperature response to anthropogenic SO2 emissions from China in three climate models." Atmos. Chem. Phys. 16 (15): 9785-9804 [10.5194/acp-16-9785-2016] [Journal Article/Letter]

2016. "Large gain in air quality compared to an alternative anthropogenic emissions scenario." Atmos. Chem. Phys. 16 (15): 9771-9784 [10.5194/acp-16-9771-2016] [Journal Article/Letter]

2016. "Evaluation of the aerosol vertical distribution in global aerosol models through comparison against CALIOP measurements: AeroCom phase II results." J. Geophys. Res. Atmos. 121 (12): 7254-7283 [10.1002/2015jd024639] [Journal Article/Letter]

2016. "Significant atmospheric aerosol pollution caused by world food cultivation." Geophysical Research Letters 43 (10): 5394-5400 [10.1002/2016gl068354] [Journal Article/Letter]

2016. "Past, Present, and Future Atmospheric Nitrogen Deposition." Journal of the Atmospheric Sciences 73 (5): 2039-2047 [10.1175/jas-d-15-0278.1] [Journal Article/Letter]

2016. "Non-OH chemistry in oxidation flow reactors for the study of atmospheric chemistry systematically examined by modeling." Atmos. Chem. Phys. 16 (7): 4283-4305 [10.5194/acp-16-4283-2016] [Journal Article/Letter]

2016. "Evaluation of observed and modelled aerosol lifetimes using radioactive tracers of opportunity and an ensemble of 19 global models." Atmos. Chem. Phys. 16 (5): 3525-3561 [10.5194/acp-16-3525-2016] [Journal Article/Letter]

2016. "What controls the vertical distribution of aerosol? Relationships between process sensitivity in HadGEM3–UKCA and inter-model variation from AeroCom Phase II." Atmos. Chem. Phys. 16 (4): 2221-2241 [10.5194/acp-16-2221-2016] [Journal Article/Letter]

2016. "New statistical model for variability of aerosol optical thickness: Theory and application to MODIS data over ocean." Journal of the Atmospheric Sciences 73 (2): 821-837 [10.1175/jas-d-15-0130.1] [Journal Article/Letter]

2015. "Interannual variability of tropospheric trace gases and aerosols: The role of biomass burning emissions." J. Geophys. Res. Atmos. 120 (14): 7157-7173 [10.1002/2014jd022926] [Journal Article/Letter]

2015. "A multi-model evaluation of aerosols over South Asia: common problems and possible causes." Atmos. Chem. Phys. 15 5903-5928 [10.5194/acp-15-5903-2015] [Journal Article/Letter]

2015. "Do responses to different anthropogenic forcings add linearly in climate models?." Environ. Res. Lett. 10 (10): 104010 [doi:10.1088/1748-9326/10/10/104010] [Journal Article/Letter]

2015. "Sensitivity to factors underlying the hiatus." US CLIVAR Variations 13 (3): 25-29 [Full Text] [Journal Article/Letter]

2015. "Reforestation and crop land conversion impacts on future regional air quality in the Southeastern U.S." Agr. Forest Meteorol. 209 78-86 [doi:10.1016/j.agrformet.2015.05.001] [Journal Article/Letter]

2015. "Future climate change under RCP emission scenarios with GISS ModelE2." J. Adv. Model. Earth Syst. 7 (1): 244-267 [doi:10.1002/2014MS000403] [Journal Article/Letter]

2015. "Impacts of potential CO2-reduction policies on air quality in the United States." Environ. Sci. Technol. 49 (8): 5133-5141 [doi:10.1021/acs.est.5b00473] [Journal Article/Letter]

2014. "Modelled black carbon radiative forcing and atmospheric lifetime in AeroCom Phase II constrained by aircraft observations." Atmos. Chem. Phys. 14 12465-12477 [doi:10.5194/acp-14-12465-2014] [Journal Article/Letter]

2014. "The AeroCom evaluation and intercomparison of organic aerosol in global models." Atmos. Chem. Phys. 14 10845-10895 [doi:10.5194/acp-14-10845-2014] [Journal Article/Letter]

2014. "Sensitivity of air quality to potential future climate change and emissions in the United States and major cities." Atmos. Environ. 94 552-563 [doi:10.1016/j.atmosenv.2014.05.079] [Journal Article/Letter]

2014. "CMIP5 historical simulations (1850-2012) with GISS ModelE2." J. Adv. Model. Earth Syst. 6 (2): 441-477 [10.1002/2013MS000266] [Journal Article/Letter]

2014. "Sources, sinks, and transatlantic transport of North African dust aerosol: A multimodel analysis and comparison with remote sensing data." J. Geophys. Res. Atmos. 119 6259-6277 [10.1002/2013JD021099] [Journal Article/Letter]

2014. "Intercomparison and evaluation of global aerosol microphysical properties among AeroCom models of a range of complexity." Atmos. Chem. Phys. 14 (9): 4679-4713 [10.5194/acp-14-4679-2014] [Journal Article/Letter]

2014. "Configuration and assessment of the GISS ModelE2 contributions to the CMIP5 archive." J. Adv. Model. Earth Syst. 6 (1): 141-184 [10.1002/2013MS000265] [Journal Article/Letter]

2014. "An AeroCom assessment of black carbon in Arctic snow and sea ice." Atmos. Chem. Phys. 14 (5): 2399-2417 [10.5194/acp-14-2399-2014] [Journal Article/Letter]

2014. "Reconciling warming trends." Nature Geosci 7 (3): 158-160 [10.1038/ngeo2105] [Journal Article/Letter]

2013. "Historical and future black carbon deposition on the three ice caps: Ice core measurements and model simulations from 1850 to 2100." J. Geophys. Res. Atmos. 118 (14): 7948-7961 [10.1002/jgrd.50612] [Journal Article/Letter]

2013. "Production mechanisms, number concentration, size distribution, chemical composition, and optical properties of sea spray aerosols." Atmos. Sci. Lett. 14 (4): 207-213 [10.1002/asl2.441] [Journal Article/Letter]

2013. "Radiative forcing of the direct aerosol effect from AeroCom Phase II simulations." Atmos. Chem. Phys. 13 (4): 1853-1877 [10.5194/acp-13-1853-2013] [Journal Article/Letter]

2013. "Black carbon vertical profiles strongly affect its radiative forcing uncertainty." Atmos. Chem. Phys. 13 (5): 2423-2434 [10.5194/acp-13-2423-2013] [Journal Article/Letter]

2013. "Potential impact of land use change on future regional climate in the Southeastern U.S.: Reforestation and crop land conversion." J. Geophys. Res. Atmos. 118 (20): 11,577-11,588 [10.1002/2013JD020356] [Journal Article/Letter]

2013. "Downscaling a global climate model to simulate climate change over the US and the implication on regional and urban air quality." Geosci. Model Dev. 6 (5): 1429-1445 [10.5194/gmd-6-1429-2013] [Journal Article/Letter]

2013. "Uncertainties and importance of sea spray composition on aerosol direct and indirect effects." J. Geophys. Res. Atmos. 118 (1): 220-235 [10.1029/2012JD018165] [Journal Article/Letter]

2012. "Analysis of fine-mode aerosol retrieval capabilities by different passive remote sensing instrument designs." Opt. Express 20 (19): 21,457-21,484 [10.1364/OE.20.021457] [Journal Article/Letter]

2012. "Atmospheric fluxes of organic N and P to the global ocean." Global Biogeochem. Cycles 26 (3): GB3026 [10.1029/2011GB004277] [Journal Article/Letter]

2011. "Evidence of a natural marine source of oxalic acid and a possible link to glyoxal." J. Geophys. Res. 116 (D16): D16204 [10.1029/2011JD015659] [Journal Article/Letter]

2011. "Estimating the direct and indirect effects of secondary organic aerosols using ECHAM5-HAM." Atmos. Chem. Phys. 11 (16): 8635-8659 [10.5194/acp-11-8635-2011] [Journal Article/Letter]

2011. "In-cloud oxalate formation in the global troposphere: a 3-D modeling study." Atmos. Chem. Phys. 11 (12): 5761-5782 [10.5194/acp-11-5761-2011] [Journal Article/Letter]

2010. "Global Modeling of the Oceanic Source of Organic Aerosols." Advances in Meteorology 2010 (939171): 1-16 [10.1155/2010/939171] [Journal Article/Letter]

2010. "Terrestrial biogeochemical feedbacks in the climate system." Nature Geosci 3 (8): 525-532 [10.1038/ngeo905] [Journal Article/Letter]

2010. "A global modeling study on carbonaceous aerosol microphysical characteristics and radiative effects." Atmos. Chem. Phys. 10 (15): 7439-7456 [10.5194/acp-10-7439-2010] [Journal Article/Letter]

2009. "Formation of secondary organic aerosol from isoprene oxidation over Europe." Atmos. Chem. Phys. 9 (18): 7003-7030 [10.5194/acp-9-7003-2009] [Journal Article/Letter]

2008. "The influence of natural and anthropogenic secondary sources on the glyoxal global distribution." Atmos. Chem. Phys. 8 (16): 4965-4981 [10.5194/acp-8-4965-2008] [Journal Article/Letter]

2006. "Change in global aerosol composition since preindustrial times." Atmos. Chem. Phys. 6 (12): 5143-5162 [10.5194/acp-6-5143-2006] [Journal Article/Letter]

2005. "Naturally driven variability in the global secondary organic aerosol over a decade." Atmos. Chem. Phys. 5 (7): 1891-1904 [10.5194/acp-5-1891-2005] [Journal Article/Letter]

2005. "Organic aerosol and global climate modelling: a review." Atmos. Chem. Phys. 5 (4): 1053-1123 [10.5194/acp-5-1053-2005] [Journal Article/Letter]

2003. "Global modelling of secondary organic aerosol in the troposphere: a sensitivity analysis." Atmos. Chem. Phys. 3 (5): 1849-1869 [10.5194/acp-3-1849-2003] [Journal Article/Letter]

2002. "Importance of volatile organic compounds photochemistry over a forested area in central Greece." Atmos Environ 36 (19): 3137-3146 [10.1016/S1352-2310(02)00234-0] [Journal Article/Letter]

2002. "Factors controlling the diurnal variation of CO above a forested area in southeast Europe." Atmos Environ 36 (19): 3127-3135 [10.1016/S1352-2310(02)00237-6] [Journal Article/Letter]

2000. "Temporal variations of surface regional background ozone over Crete Island in the southeast Mediterranean." J. Geophys. Res. 105 4399-4407 [doi:10.1029/1999JD900984] [Journal Article/Letter]

2000. "Human-activity-enhanced formation of organic aerosols by biogenic hydrocarbon oxidation." J. Geophys. Res. 105 9243-9354 [doi:10.1029/1999JD901148] [Journal Article/Letter]

Non-Refereed

2018. "Highly Volcanic Exoplanets, Lava Worlds, and Magma Ocean Worlds: An Emerging Class of Dynamic Exoplanets of Significant Scientific Priority." ArXiv e-prints [Journal Article/Letter]