I am a Ph.D. candidate in Environmental Science and Engineering at Harvard University, advised by Daniel Jacob. My research focuses on methane emissions, with an emphasis on using atmospheric observations and modeling to better understand where emissions come from and how they vary across regions and sectors. Outside of research, I enjoy vegan baking, swimming, and spending time in the sun.
Hancock, S.E., Jacob, D.J., Jimenez, R., Ardila, A., Morales-Rincon, L., Rojas, N., Estrada, L.A., Balasus, N., East, J.D., Sulprizio, M.P., Wang, X., Potyk, L., Chen, Z., Varon, D.J., Frankenberg, C., Baranski, M., and Calcan, A. Applying satellite observations to improve bottom-up national emission inventories for methane: Application to Colombia. Submitted to Atmospheric Chemistry and Physics. https://doi.org/10.5194/egusphere-2025-5478, 2026.
Hancock, S.E., Jacob, D.J., Chen, Z., Nesser, H., Davitt, A., Varon, D.J., Sulprizio, M.P., Balasus, N., Estrada, L.A., Cazorla, M., Dawidowski, L., Diez, S., East, J.D., Penn, E., Randles, C.A., Worden, J., Aben, I., Parker, R.J., and Maasakkers, J.D. Satellite quantification of methane emissions from South American countries: a high-resolution inversion of TROPOMI and GOSAT observations. Atmospheric Chemistry and Physics, 25, 797–817. https://doi.org/10.5194/acp-25-797-2025, 2025.
Hancock, S.E., Fiore, A.M., Westervelt, D.M., Correa, G., Lamarque, J.-F., Venkataraman, C., and Sharma, A. Changing PM2.5 and related meteorology over India from 1950–2014: A new perspective from a chemistry–climate model ensemble. Environmental Research: Climate, 2, 015003. https://doi.org/10.1088/2752-5295/acb22a, 2023.
Estrada, L.A., Varon, D.J., Sulprizio, M.P., Nesser, H., Chen, Z., Balasus, N., Hancock, S.E., He, M., East, J.D., and Mooring, T.A. Integrated Methane Inversion (IMI 2.0): An improved research and stakeholder tool for monitoring total methane emissions with high resolution worldwide using TROPOMI satellite observations. EGUsphere, 2024, 1–31. https://doi.org/10.5194/egusphere-2024-31.
Chen, Z., Lin, H., Balasus, N., Hardy, A., East, J.D., Zhang, Y., Runkle, B.R.K., Hancock, S.E., Taylor, C.A., Du, X., Sander, B.O., and Jacob, D.J. Global Rice Paddy Inventory (GRPI): A high-resolution inventory of methane emissions from rice agriculture based on Landsat satellite inundation data. Earth’s Future, 12, e2024EF005479. https://doi.org/10.1029/2024EF005479, 2025.
Chen, Z., Jacob, D.J., Gautam, R., Omara, M., Stavins, R.N., Stowe, R.C., Nesser, H.O., Sulprizio, M.P., Lorente, A., Varon, D.J., Lu, X., Shen, L., Qu, Z., Pendergrass, D.C., and Hancock, S.E. Satellite quantification of methane emissions and oil/gas methane intensities from individual countries in the Middle East and North Africa: Implications for climate action. Atmospheric Chemistry and Physics, 23, 5945–5967. https://doi.org/10.5194/acp-23-5945-2023, 2023.
Fiore, A.M., Hancock, S.E., Lamarque, J.-F., Correa, G.P., Chang, K.-L., Ru, M., Cooper, O., Gaudel, A., Polvani, L.M., Sauvage, B., and Ziemke, J.R. Understanding recent tropospheric ozone trends in the context of large internal variability: A new perspective from chemistry–climate models. Environmental Research: Climate, 1, 025008. https://doi.org/10.1088/2752-5295/ac9cc2, 2022.
Fiore, A.M., Milly, G.P., Hancock, S.E., Quiñones, L., Bowden, J.H., Helstrom, E., et al. Characterizing changes in eastern U.S. pollution events in a warming world. Journal of Geophysical Research: Atmospheres, 127, e2021JD035985. https://doi.org/10.1029/2021JD035985, 2022.
Varon, D.J., Jacob, D.J., Sulprizio, M.P., Estrada, L.A., Downs, W.B., Shen, L., Hancock, S.E., Nesser, H., Qu, Z., Penn, E., Chen, Z., Lu, X., Lorente, A., Tewari, A., and Randles, C.A. Integrated Methane Inversion (IMI 1.0): A user-friendly, cloud-based facility for inferring high-resolution methane emissions from TROPOMI satellite observations. Geoscientific Model Development, 15, 5787–5805. https://doi.org/10.5194/gmd-15-5787-2022, 2022.
American Geophysical Union (AGU) Fall 2025 Meeting, December 2025. Explaining the rapid 2019-2024 increase in methane emissions from Colombia seen in satellite observations: a high-resolution inverse analysis.
Harvard Methane Initiative Workshop, São Paulo, Brazil, December 2025. Integrating bottom-up and satellite methods to quantify methane emissions in South America.
European Geosciences Union (EGU) Annual Meeting, April 2025. Evaluating the Utility of Satellite Observations for Improving Bottom-Up National Emission Inventories: Application to Colombia.
American Meteorological Society (AMS) Annual Meeting, January 2025. Evaluating the Utility of Satellite Observations for Improving Bottom-Up National Emission Inventories: Application to Colombia.
Private and Public, Scientific, Academic, and Consumer Food Policy Group (PAPSAC), December 2024. Using satellite observations to monitor methane from livestock. (Invited)
American Geophysical Union (AGU) Fall 2023 Meeting, December 2023. Remote. South American methane: a high-resolution inversion of blended TROPOMI+GOSAT satellite observations.
American Meteorological Society (AMS) Annual Meeting, January 2021. Remote. Changing PM2.5 and related meteorology over India from 1950-2014: A new perspective from a chemistry-climate model ensemble.
Community Earth System Model (CESM) Winter Working Group Meeting, February 2021. Changing PM2.5 and related meteorology over India from 1950-2014: A new perspective from a chemistry-climate model ensemble.
American Geophysical Union (AGU) Fall 2020 Meeting, December 2020. Changing PM2.5 and related meteorology over India from 1950-2014: A new perspective from a chemistry-climate model ensemble.