Can Biomass Burning Aerosol Induced Surface Cooling Be Amplified Through Sea Surface Temperature‐Cloud Feedback Over the Southeast Atlantic?

Lu, Zheng; Liu, Xiaohong

doi:10.1029/2022GL101377

Title: Can Biomass Burning Aerosol Induced Surface Cooling Be Amplified Through Sea Surface Temperature‐Cloud Feedback Over the Southeast Atlantic?

Journal Article · Tue Jan 31 00:00:00 EST 2023 · Geophysical Research Letters

DOI:https://doi.org/10.1029/2022GL101377· OSTI ID:1922870

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Department of Atmospheric Sciences Texas A&,M University College Station TX USA

Abstract Biomass burning (BB) aerosols exert a strong surface cooling effect over the southeast Atlantic (SEA) via aerosol‐radiation and aerosol‐cloud interactions. The reduction of the sea surface temperature (SST) can trigger the SST‐low cloud feedback. Whether this feedback can amplify the surface cooling effect is examined. The modeling results from the Community Earth System Model version 2 (CESM2) demonstrate that counterintuitively the cloud radiative effect (CRE) caused by the BB aerosols is weaker if SST‐low cloud feedback is considered compared to fixed‐SST simulation (−2.99 W m ⁻² vs. −4.79 W m ⁻² ). This is caused by (a) stronger sea breeze due to larger sea‐land temperature contrast causing less smoke transport over SEA and (b) less moisture supply from surface due to colder SST. Changes in SST also lead to counterclockwise rotation of ocean circulation anomalies. Consequently, the excess heat transport from the equator reverses the direction of SST‐cloud feedback in this region.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐SC0022065

OSTI ID:: 1922870

Alternate ID(s):: OSTI ID: 1922871

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Vol. 50 Journal Issue: 3; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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