Multi-angular polarimetric remote sensing to pinpoint global aerosol absorption and direct radiative forcing

Cheng Chen (), Oleg Dubovik (), Gregory L. Schuster, Mian Chin, Daven K. Henze, Tatyana Lapyonok, Zhengqiang Li, Yevgeny Derimian and Ying Zhang
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Cheng Chen: Univ. Lille, CNRS, UMR 8518 - LOA - Laboratoire d’Optique Atmosphérique
Oleg Dubovik: Univ. Lille, CNRS, UMR 8518 - LOA - Laboratoire d’Optique Atmosphérique
Gregory L. Schuster: NASA Langley Research Center
Mian Chin: NASA Goddard Space Flight Center
Daven K. Henze: University of Colorado
Tatyana Lapyonok: Univ. Lille, CNRS, UMR 8518 - LOA - Laboratoire d’Optique Atmosphérique
Zhengqiang Li: Chinese Academy of Sciences
Yevgeny Derimian: Univ. Lille, CNRS, UMR 8518 - LOA - Laboratoire d’Optique Atmosphérique
Ying Zhang: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract Quantitative estimations of atmospheric aerosol absorption are rather uncertain due to the lack of reliable information about the global distribution. Because the information about aerosol properties is commonly provided by single-viewing photometric satellite sensors that are not sensitive to aerosol absorption. Consequently, the uncertainty in aerosol radiative forcing remains one of the largest in the Assessment Reports of the Intergovernmental Panel on Climate Change (IPCC AR5 and AR6). Here, we use multi-angular polarimeters (MAP) to provide constraints on emission of absorbing aerosol species and estimate global aerosol absorption optical depth (AAOD) and its climate effect. Our estimate of modern-era mid-visible AAOD is 0.0070 that is higher than IPCC by a factor of 1.3-1.8. The black carbon instantaneous direct radiative forcing (BC DRF) is +0.33 W/m2 [+0.17, +0.54]. The MAP constraint narrows the 95% confidence interval of BC DRF by a factor of 2 and boosts confidence in its spatial distribution.

Date: 2022
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DOI: 10.1038/s41467-022-35147-y

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