Sciences and Exploration Directorate

Alexander E. Kotsakis



Org Code: 613

Mail Code: 613
Greenbelt, MD 20771


Current Projects

AI/ML Planteary Boundary Layer Retrieval Development and Hyperspectral Microwave Instrument Development

Earth's Atmosphere


Assistant Research Scientist

University of Maryland College Park/ESSIC - Greenbelt, MD

August 2023 - Present

Dr. Kotsakis is contributing to the development of an AI/ML planetary boundary layer (PBL) retrieval algorithm using his extensive knowledge of the boundary layer meteorology and assists in trade studies for future hyperspectral microwave sensors.

Assistant Research Scientist

ERT, Inc. - Laurel, MD

January 2022 - July 2023

NPP Postdoctoral Fellow (USRA)

Advisor: Robert J Swap - NASA Goddard Space Flight Center

July 2018 - December 2021

Research Staff

University of Houston - Houston, TX, USA

January 2018 - June 2018

Research Assistant

University of Houston - Houston, TX, USA

January 2017 - December 2017

Teaching Assistant

University of Houston - Houston, TX, USA

January 2014 - December 2016


B.S. Meteorology/Minor in Mathematics, Valparaiso University, 2013

Ph.D. Atmospheric Science, University of Houston, 2017




Thompson, A. M., D. E. Kollonige, R. M. Stauffer, et al. A. E. Kotsakis, N. Abuhassan, L. N. Lamsal, R. J. Swap, D. R. Blake, A. Townsend‐Small, and H. D. Wecht. 2023. Two Air Quality Regimes in Total Column NO<sub>2</sub> Over the Gulf of Mexico in May 2019: Shipboard and Satellite Views Earth and Space Science 10 (3): [10.1029/2022ea002473]

Gambacorta, A., J. Piepmeier, M. Stephen, et al. J. Santanello, J. Blaisdell, I. Moradi, W. McCarty, R. Rosenberg, A. Kotsakis, J. MacKinnon, F. Gambini, P. Mohammed, R. Kroodsma, I. Adams, and P. Racette. 2023. Advancing Atmospheric Thermodynamic Sounding from Space using Hyperspectral Microwave Measurements IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 1-16 [10.1109/jstars.2023.3269697]

Shrestha, S., S. Yoon, M. H. Erickson, et al. F. Guo, M. Mehra, A. A. Bui, B. C. Schulze, A. Kotsakis, C. Daube, S. C. Herndon, T. I. Yacovitch, S. Alvarez, J. H. Flynn, R. J. Griffin, G. P. Cobb, S. Usenko, and R. J. Sheesley. 2022. Traffic, transport, and vegetation drive VOC concentrations in a major urban area in Texas Science of The Total Environment 838 155861 [10.1016/j.scitotenv.2022.155861]

Yoon, S., A. Kotsakis, S. L. Alvarez, et al. M. G. Spychala, E. Klovenski, P. Walter, G. Morris, E. Corrales, A. Alan, J. A. Diaz, and J. H. Flynn. 2022. Development and testing of a novel sulfur dioxide sonde Atmospheric Measurement Techniques 15 (14): 4373-4384 [10.5194/amt-15-4373-2022]

Kotsakis, A., J. T. Sullivan, T. F. Hanisco, et al. R. J. Swap, V. Caicedo, T. A. Berkoff, G. Gronoff, C. P. Loughner, X. Ren, W. T. Luke, P. Kelley, P. R. Stratton, R. Delgado, N. Abuhassan, L. Shalaby, F. C. Santos, and J. Dreessen. 2022. Sensitivity of total column NO2 at a marine site within the Chesapeake Bay during OWLETS-2 Atmospheric Environment 277 119063 [10.1016/j.atmosenv.2022.119063]

Spinei, E., M. Tiefengraber, M. Müller, et al. M. Gebetsberger, A. Cede, L. Valin, J. Szykman, A. Whitehill, A. Kotsakis, F. Santos, N. Abbuhasan, X. Zhao, V. Fioletov, S. C. Lee, and R. Swap. 2021. Effect of Polyoxymethylene (POM-H Delrin) offgassing within Pandora head sensor on direct sun and multi-axis formaldehyde column measurements in 2016–2019 Atmospheric Measurement Techniques 14 647–663 [10.5194/amt-14-647-2021]

Thompson, A. M., D. E. Kollonige, R. M. Stauffer, et al. N. K. Abuhassan, A. E. Kotsakis, R. J. Swap, and H. Wecht. 2020. SCOAPE: Satellite and Shipboard Views of Air Quality along the Louisiana Coast EM: The Magazine for Environmental Managers (Oct. 2020): 28-33

Sadeghi, B., Y. Choi, S. Yoon, et al. J. Flynn, A. Kotsakis, and S. Lee. 2020. The characterization of fine particulate matter downwind of Houston: Using integrated factor analysis to identify anthropogenic and natural sources Environmental Pollution 262 114345 [10.1016/j.envpol.2020.114345]

Robinson, J., A. Kotsakis, F. Santos, et al. R. Swap, K. E. Knowland, G. Labow, V. Connors, M. Tzortziou, N. Abuhassan, M. Tiefengraber, and A. Cede. 2020. Using networked Pandora observations to capture spatiotemporal changes in total column ozone associated with stratosphere-to-troposphere transport Atmospheric Research 238 104872 [10.1016/j.atmosres.2020.104872]

Demetillo, M. G., J. F. Anderson, J. A. Geddes, et al. X. Yang, E. Y. Najacht, S. A. Herrera, K. M. Kabasares, A. E. Kotsakis, M. T. Lerdau, and S. E. Pusede. 2019. Observing Severe Drought Influences on Ozone Air Pollution in California Environmental Science & Technology acs.est.8b04852 [10.1021/acs.est.8b04852]

Kotsakis, A., Y. Choi, A. Souri, W. Jeon, and J. Flynn. 2019. Characterization of Regional Wind Patterns Using Self-Organizing Maps: Impact on Dallas-Fort Worth Long-Term Ozone Trends Journal of Applied Meteorology and Climatology 58 (4): 757-772 [10.1175/jamc-d-18-0045.1]

Buysse, C. E., J. A. Munyan, C. A. Bailey, et al. A. Kotsakis, J. A. Sagona, A. Esperanza, and S. E. Pusede. 2018. On the effect of upwind emission controls on ozone in Sequoia National Park Atmospheric Chemistry and Physics 18 (23): 17061-17076 [10.5194/acp-2017-1006]

Kotsakis, A., G. A. Morris, B. Lefer, et al. W. Jeon, A. Roy, K. Minschwaner, A. M. Thompson, and Y. Choi. 2017. Ozone production by corona discharges during a convective event in DISCOVER-AQ Houston Atmospheric Environment 161 13-17 [10.1016/j.atmosenv.2017.04.018]

Souri, A. H., Y. Choi, X. Li, A. Kotsakis, and X. Jiang. 2016. A 15-year climatology of wind pattern impacts on surface ozone in Houston, Texas Atmospheric Research 174-175 124-134 [10.1016/j.atmosres.2016.02.007]


Thompson, A. M., D. E. Kollonige, R. M. Stauffer, et al. N. K. Abuhassan, A. E. Kotsakis, R. J. Swap, and H. Wecht. 2020. Satellite and shipboard views of air quality along the Louisiana coast: The 2019 SCOAPE (Satellite Coastal and Oceanic Atmospheric Pollution Experiment) cruise EM: Environmental Manager Special Issue 6 pp

Professional Societies

American Meteorological Society

2009 - Present

American Geophysical Union

2014 - Present

European Geophysical Union

2019 - Present

Institute of Electrical and Electronics Engineers

2023 - Present

Talks, Presentations and Posters


Impacts of Biomass Burning on Free-Tropospheric Ozone Photochemistry over the Southern United States

February 10, 2018

American Meteorological Society 98th Annual Meeting

Characterization of Wind Patterns over Texas Using Self-Organizing Maps: Impact on Dallas-Fort Worth Long Term Ozone Trends

14, 2017

2017 American Geophysical Union Fall Meeting

Impact of Synoptic & Global Scale Features On The Year-To-Year Variability of Ozone Exceedances in Houston

February 13, 2016

American Meteorological Society 96th Annual Meeting

Coronal Induced Production of Ozone from a Thunderstorm During DISCOVER-AQ 2013

June 8, 2015

2015 DISCOVER-AQ Team Meeting, Boulder, CO

Sources of Ozone in the Free Troposphere in Houston During DISCOVER-AQ 2013


2014 American Geophysical Union Fall Meeting

Investigation of Idabel, Oklahoma Ozone Concentration Pre and Post-Frontal Passage

May 24, 2013

2013 Celebration of Undergraduate Scholarship