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The Semidirect Effect of Combined Dust and Sea Salt Aerosols in a Multimodel Analysis

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Title
The Semidirect Effect of Combined Dust and Sea Salt Aerosols in a Multimodel Analysis
Author(s)
Amiri-Farahani, Anahita; Allen, Robert J.; Li, King-Fai; Jung-Eun Chu
Publication Date
2019-09
Journal
GEOPHYSICAL RESEARCH LETTERS, v.46, no.17-18, pp.10512 - 10521
Publisher
AMER GEOPHYSICAL UNION
Abstract
To date, very few studies have focused on dust and sea salt cloud interactions, particularly the semidirect effect (SDE) that results from changes in column temperature and moisture. Here, we isolate the SDE using several climate models driven by semiempirical dust and sea salt direct radiative effects. The global annual mean SDE varies from 0.01 to 0.10 W/m(2), with the bulk of the signal coming from an increase in shortwave radiation. This is consistent with decreases in low cloud over ocean due to cloud burn-off and reductions in midlevel cloud over land due to atmospheric stabilization and decreased convection. Overall, longwave effects weaken the positive SDE but with opposing effects over land and sea. High cloud is reduced over land but enhanced over sea. We conclude that dust and sea salt likely exert a global mean warming effect through cloud rapid adjustments.
URI
https://pr.ibs.re.kr/handle/8788114/10574
DOI
10.1029/2019GL084590
ISSN
0094-8276
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > 1. Journal Papers (저널논문)
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