A112-0004
Joint retrieval of greenhouse gases and aerosols in a polluted urban atmosphere: Development of a full physics algorithm for CLARS-FTS in the Los Angeles megacity

Friday, 11 December 2020
Poster
Zhao-Cheng Zeng1,2, Vijay Natraj3, Sihe Chen4, Feng Xu5, Thomas Pongetti6, Yuk L Yung2 and Stanley Sander6, (1)University of California, Los Angeles, Pasadena, CA, United States, (2)California Institute of Technology, Pasadena, CA, United States, (3)Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States, (4)California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States, (5)University of Oklahoma, School of Meteorology, Norman, OK, United States, (6)NASA Jet Propulsion Laboratory, Pasadena, CA, United States
Abstract:
Many operational greenhouse gas (GHG) retrieval algorithms for space-borne observations filter out scenes with optically thick (e.g., aerosol optical depth (AOD) > 0.3 in the near infrared) aerosols. However, large source regions such as megacities are also typically associated with heavy aerosol loading. In this study, we develop a full physics algorithm for joint retrieval of GHGs and aerosols and apply the algorithm to observations from the California Laboratory for Atmospheric Remote Sensing-Fourier Transform Spectrometer (CLARS-FTS). CLARS-FTS is located on Mt. Wilson, California overlooking the Los Angles megacity and observes reflected sunlight in the 0.7–2.5 µm spectral range. We perform a simultaneous retrieval of GHGs, including CO2 and CH4, and aerosol properties, including AOD, effective aerosol layer height, and single scattering albedo. We also evaluate the effect of aerosol scattering on GHG retrievals. These results will help guide revisions to existing urban GHG remote sensing algorithms and increase the amount of useable data, especially in megacities where anthropogenic fluxes of CH4 and CO2 are large.
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