Sciences and Exploration Directorate

Sarah Elizabeth Ringerud



Org Code: 612

Mail Code: 612
Greenbelt, MD 20771

Employer: NASA

Brief Bio

Sarah Ringerud received her B.S. in Mathematics and Atmospheric and Oceanic Sciences from the University of Wisconsin-Madison, and the M.S. and Ph.D from Colorado State University. Research interests include remote sensing of the global hydrologic cycle, atmospheric radiation, radiative transfer modeling, and surface emissivity retrieval and modeling. Recent research is focused on precipitation algorithm development for satellite passive microwave sensors as part of the Global Precipitation Measurement (GPM) algorithm teams. Sarah currently specializes in retrievals over land and understanding of dynamic surface conditions from a radiometric perspective.

Research Interests

Current Projects

Global Precipitation Measurement (GPM)


Algorithm development with focus on passive microwave retrievals over land

Atmospheric Observing System (AOS)

Remote Sensing

Early radiometer algorithm development


Research Meteorologist, AST


January 2023 - Present

Assistant Research Scientist

University of Maryland - NASA GSFC

July 2019 - December 2022

Postdoctoral Researcher

University of Maryland - NASA GSFC

July 2017 - June 2019

Postdoctoral Fellow

NASA Postdoctoral Program (NPP) - NASA GSFC

July 2015 - June 2017


PhD. Atmospheric Science; Emphasis: Remote Sensing, Colorado State University, Fort Collins, Colorado, 5/2015                 

M.S. Atmospheric Science; Emphasis: Remote Sensing, Colorado State University, Fort Collins, Colorado, 5/2006

B.S. Atmospheric and Oceanic Sciences, Mathematics, University of Wisconsin - Madison, Madison, WI, 2002

Professional Societies

Phi Beta Kappa


2002 - Present

American Geophysical Union (AGU)


2012 - Present

American Meteorological Society


2000 - Present

IEEE Geoscience and Remote Sensing Society


2012 - Present


-UMD-ESSIC Best Paper of the Year Award 2021:

Ringerud, S., C. Peters-Lidard, S. J. Munchak, Y. You, 2021: Applications of Dynamic Land Surface Information for Passive Microwave Precipitation Retrieval, J. Atmos. And Ocean. Tech., 38(2), 167-183. DOI: 10.1175/JTECH-D-20-0048.1

IEEE Geoscience and Remote Sensing Society 2020 Transactions Prize Paper Award:

Munchak, S.J., S. Ringerud, L. Brucker, Y. You, I. de Gelis and C. Prigent, 2020: An Active-Passive Microwave Land Surface Database From GPM, IEEE Transactions on Geoscience and Remote Sensing, 58, 6224-6242. DOI: 10.1109/TGRS.2020.2975477

 -NASA GSFC Mesoscale Atmospheric Processes Lab 2017 Exceptional Scientific Achievement Award

- NASA Group Achievement Award, Global Precipitation Measurement Mission, Post Launch Team 2015

- NASA Postdoctoral Program (NPP) Fellowship 2015

- Certificate of Excellence for Presentation, GEWEX 7th International Conference on the Global Energy and Water Cycle, July 2014

- Alumni Award for Outstanding Paper by a PhD Student (CSU Atmospheric Science Department) May 2014

- NASA Earth and Space Sciences Fellowship (NESSF) 2013

- Center for Earth Atmosphere Studies Fellowship, (a cooperative fellowship linking Colorado State University and NASA’s Goddard Space Flight Center) 2009

- Hilldale Fellowship for Undergraduate Research, 2001



Rahimi, R., A. Ebtehaj, G. Panegrossi, et al. L. Milani, S. E. Ringerud, and F. Joseph Turk. 2022. Vulnerability of Passive Microwave Snowfall Retrievals to Physical Properties of Snowpack: A Perspective from Dense Media Radiative Transfer Theory IEEE Transactions on Geoscience and Remote Sensing 1-1 [10.1109/tgrs.2022.3184530]

You, Y., C. Peters-Lidard, S. J. Munchak, et al. J. Tan, S. Braun, S. Ringerud, W. Blackwell, J. X. Yang, E. Nelkin, and J. Dong. 2021. Improving Cross-track Scanning Radiometers’ Precipitation Retrieval over Ocean by Morphing Journal of Hydrometeorology 22 (9): 2393-2406 [10.1175/jhm-d-21-0038.1]

Turk, F. J., S. E. Ringerud, A. Camplani, et al. D. Casella, R. J. Chase, A. Ebtehaj, J. Gong, M. Kulie, G. Liu, L. Milani, G. Panegrossi, R. Padullés, J.-F. Rysman, P. Sanò, S. Vahedizade, and N. B. Wood. 2021. Applications of a CloudSat-TRMM and CloudSat-GPM Satellite Coincidence Dataset Remote Sensing 13 (12): 2264 [10.3390/rs13122264]

Kidd, C., T. Matsui, and S. Ringerud. 2021. Precipitation Retrievals from Passive Microwave Cross-Track Sensors: The Precipitation Retrieval and Profiling Scheme Remote Sensing 13 (5): 947 [10.3390/rs13050947]

Milani, L., M. S. Kulie, D. Casella, et al. P. E. Kirstetter, G. Panegrossi, V. Petkovic, S. E. Ringerud, J.-F. Rysman, P. Sanò, N.-Y. Wang, Y. You, and G. Skofronick-Jackson. 2021. Extreme Lake-Effect Snow from a GPM Microwave Imager Perspective: Observational Analysis and Precipitation Retrieval Evaluation Journal of Atmospheric and Oceanic Technology 38 (2): 293-311 [10.1175/jtech-d-20-0064.1]

Ringerud, S., C. Peters-Lidard, J. Munchak, and Y. You. 2021. Applications of Dynamic Land Surface Information for Passive Microwave Precipitation Retrieval Journal of Atmospheric and Oceanic Technology 38 (2): 167-180 [10.1175/jtech-d-20-0048.1]

Munchak, S. J., S. Ringerud, L. Brucker, et al. Y. You, I. de Gelis, and C. Prigent. 2020. An Active–Passive Microwave Land Surface Database From GPM IEEE Transactions on Geoscience and Remote Sensing 58 (9): 6224-6242 [10.1109/tgrs.2020.2975477]

You, Y., S. Joseph Munchak, R. Ferraro, et al. K. Mohr, C. Peters‐Lidard, C. Prigent, S. Ringerud, S. Rudlosky, H. Wang, H. Norouzi, and S. Prakash. 2020. Raindrop Signature from Microwave Radiometer Over Deserts Geophysical Research Letters 47 (16): [10.1029/2020gl088656]

Randel, D. L., C. D. Kummerow, and S. Ringerud. 2020. The Goddard Profiling (GPROF) Precipitation Retrieval Algorithm Satellite Precipitation Measurement 141-152 [10.1007/978-3-030-24568-9_8]

You, Y., C. Peters-Lidard, N.-Y. Wang, et al. J. Turk, S. Ringerud, S. Yang, and R. Ferraro. 2018. The Instantaneous Retrieval of Precipitation Over Land by Temporal Variation at 19 GHz Journal of Geophysical Research: Atmospheres 123 (17): 9279-9295 [10.1029/2017jd027596]

You, Y., C. Peters-Lidard, J. Turk, S. Ringerud, and S. Yang. 2017. Improving Overland Precipitation Retrieval with Brightness Temperature Temporal Variation Journal of Hydrometeorology 18 (9): 2355-2383 [10.1175/jhm-d-17-0050.1]

Grecu, M., W. S. Olson, S. J. Munchak, et al. S. Ringerud, L. Liao, Z. Haddad, B. L. Kelley, and S. F. McLaughlin. 2016. The GPM Combined Algorithm Journal of Atmospheric and Oceanic Technology 33 (10): 2225-2245 [10.1175/jtech-d-16-0019.1]

Kidd, C., S. Ringerud, G. Skofronick-Jackson, and G. Huffman. 2016. Precipitation retrievals from passive microwave cross-track sounding instruments 2016 14th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad) [10.1109/microrad.2016.7530515]

Tian, Y., C. D. Peters-Lidard, K. W. Harrison, et al. Y. You, S. E. Finn, S. V. Kumar, and J. F. Turk. 2015. An examination of methods for estimating land surface microwave emissivity J. Geophys. Res. Atmos. 120 11,114-11,128 [10.1002/2015JD023582]

Ringerud, S., C. D. Kummerow, and C. D. Peters-Lidard. 2015. A Semi-Empirical Model for Computing Land Surface Emissivity in the Microwave Region IEEE Transactions on Geoscience and Remote Sensing 53 (4): 1935-1946 [10.1109/TGRS.2014.2351232]

Harrison, K. W., Y. Tian, C. D. Peters-Lidard, S. E. Finn, and S. V. Kumar. 2015. Calibration to improve forward model simulation of microwave emissivity at GPM frequencies over the U.S. Southern Great Plains IEEE Trans. Geophys. Remote Sens. 54 (2): [10.1109/TGRS.2015.2474120]

Ringerud, S., C. Kummerow, C. D. Peters-Lidard, Y. Tian, and K. W. Harrison. 2014. A Comparison of Microwave Window Channel Retrieved and Forward-Modeled Emissivities Over the US Southern Great Plains Geoscience and Remote Sensing, IEEE Transactions on 52 (5): 2395 - 2412 [10.1109/TGRS.2013.2260759]

Ferraro, R., C. Peters-Lidard, C. Hernandez, et al. F. J. Turk, F. Aires, C. Prigent, X. Lin, S. Boukabara, K. Gopalan, K. Harrison, F. Karbou, L. Li, C. Liu, H. Masunaga, L. Moy, S. Ringerud, G. Skofronick-Jackson, Y. Tian, and N.-Y. Wang. 2013. An Evaluation of Microwave Land Surface Emissivities Over the Continental United States to Benefit GPM-Era Precipitation Algorithms IEEE Trans. Geosci. Remote Sensing 51 (1): 378-398 [10.1109/TGRS.2012.2199121]


Tian, Y., C. D. Peters-Lidard, K. W. Harrison, S. V. Kumar, and S. Ringerud. 2014. Land surface microwave emissivity dynamics: Observations, analysis and modeling Microwave Radiometry and Remote Sensing of the Environment (MicroRad), 2014 13th Specialist Meeting on 99 - 102 [10.1109/MicroRad.2014.6878917]