DOI: 10.1029/2017JD027667
Scopus记录号: 2-s2.0-85046436781
论文题名: The Dust Direct Radiative Impact and Its Sensitivity to the Land Surface State and Key Minerals in the WRF-Chem-DuMo Model: A Case Study of Dust Storms in Central Asia
作者: Li L. ; Sokolik I.N.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 9 起始页码: 4564
结束页码: 4582
语种: 英语
英文关键词: direct radiative forcing
; dust aerosols
; dust modeling
; minerals
; surface albedo
; WRF-Chem
Scopus关键词: aerosol
; albedo
; atmospheric modeling
; dust
; dust storm
; land surface
; radiative forcing
; sensitivity analysis
; top of atmosphere
; Aral Sea
; Central Asia
英文摘要: The instantaneous direct radiative forcing is a basis for estimating the aerosol's climate effect, which is still one of the most uncertain factors. In this study, we incorporate eight minerals into a dust emission model that is coupled with the regional model. The model is used to estimate the direct radiative impact at the top of the atmosphere and at the surface by mineral dust. In addition, multiple tests are performed to investigate the sensitivity of the forcing to some key parameters (such as the surface albedo and key minerals, e.g., hematite and calcite). Based on our simulations of a dust event in Central Asia, the net instantaneous direct forcing (solar + infrared), averaged over the Aral Sea basin on 7 May 2007, are approximately in a range of (−8.05, −0.47) W/m2 at the top of the atmosphere. In comparison to the forcing estimated based on the default complex index, incorporation of dust minerals introduced a less cooling effect at the top of the atmosphere. We found that for a given clay-to-silt ratio, the net instantaneous forcing and the forcing in the solar band are sensitive to the surface albedo and hematite variation in the silt fraction. The forcing in the infrared band, however, is insensitive to these parameters, but it is sensitive to calcite and quartz in the silt fraction. Our results highlight the importance of accurately predicting the size-resolved content of hematite and the surface albedo change to quantify the radiative forcing of mineral dust. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113907
Appears in Collections: 气候减缓与适应
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作者单位: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States
Recommended Citation:
Li L.,Sokolik I.N.. The Dust Direct Radiative Impact and Its Sensitivity to the Land Surface State and Key Minerals in the WRF-Chem-DuMo Model: A Case Study of Dust Storms in Central Asia[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(9)