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Modeling East Asian Dust and Its Radiative Feedbacks in CAM4‐BAM
Author(s) -
Xie Xiaoning,
Liu Xiaodong,
Che Huizheng,
Xie Xiaoxun,
Wang Hongli,
Li Jiandong,
Shi Zhengguo,
Liu Yangang
Publication year - 2018
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1002/2017jd027343
Subject(s) - radiative transfer , atmospheric sciences , east asia , radiative forcing , albedo (alchemy) , aerosol , environmental science , climatology , asian dust , forcing (mathematics) , wind speed , mineral dust , atmosphere (unit) , meteorology , geography , physics , geology , archaeology , china , art , quantum mechanics , performance art , art history
Abstract East Asian dust and its radiative feedbacks are analyzed by the use of the fourth version of the Community Atmosphere Model (CAM4) with a bulk aerosol model parameterization (BAM) for the dust size distribution (CAM4‐BAM). Two numerical experiments are conducted and intercompared: one with (Active) and one without (Passive) the radiative effects of dust aerosols. This CAM4‐BAM captures the main spatial distribution of the dust aerosol optical depth (AOD) and the dust surface concentrations over East Asia, with positive correlations with the local observational data on annual and seasonal means. A comparative analysis of the Active and Passive experiments reveals that consideration of the dust‐radiation interaction can significantly reduce dust emissions, loading, transport, and dry and wet depositions over East Asia, which is opposite to the enhanced dust cycle over North Africa. Further analysis of the contrasting dust‐radiation feedbacks between North Africa and East Asia shows that over North Africa, the dust radiative forcing significantly increases the surface temperature and 10 m wind speed, whereas it decreases the surface temperature and the surface wind speeds over East Asia. These contrasting radiative effects, in turn, result in distinct dust cycle changes over these two regions. Mechanistic analysis reveals that the radiative contrasts between East Asia and North Africa are mainly due to the differences in their regional surface albedo, dust vertical distribution, and size distribution.