DOI: 10.1175/JCLI-D-15-0827.1
Scopus记录号: 2-s2.0-84991221392
论文题名: Sensitivity of the Middle East-North African tropical rainbelt to dust shortwave absorption: A high-resolution AGCM experiment
作者: Bangalath H.K. ; Stenchikov G.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 19 起始页码: 7103
结束页码: 7126
语种: 英语
Scopus关键词: Aerosols
; Atmospheric radiation
; Climatology
; Storms
; Tropics
; Dust or dust storms
; Hadley circulation
; Radiative forcings
; Regional effects
; Walker circulation
; Dust
英文摘要: Shortwave absorption is one of the most important, but the most uncertain, components of direct radiative effect by mineral dust. It has a broad range of estimates from different observational and modeling studies and there is no consensus on the strength of absorption. To elucidate the sensitivity of the Middle East-North African (MENA) tropical summer rainbelt to a plausible range of uncertainty in dust shortwave absorption, AMIP-style global high-resolution (25 km) simulations are conducted with and without dust, using the High-Resolution Atmospheric Model (HiRAM). Simulations with dust comprise three different cases by assuming dust as a very efficient, as a standard, and as an inefficient absorber. Intercomparison of these simulations shows that the response of the MENA tropical rainbelt is extremely sensitive to the strength of shortwave absorption. Further analyses reveal that the sensitivity of the rainbelt stems from the sensitivity of the multiscale circulations that define the rainbelt. The maximum response and sensitivity are predicted over the northern edge of the rainbelt, geographically over the Sahel. The sensitivity of the responses over the Sahel, especially that of precipitation, is comparable to the mean state. Locally, the response in precipitation reaches up to 50% of the mean, while dust is assumed to be a very efficient absorber. Taking into account that the Sahel has a very high climate variability and is extremely vulnerable to changes in precipitation, the present study suggests the importance of reducing uncertainty in dust shortwave absorption for a better simulation and interpretation of the Sahel climate. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50100
Appears in Collections: 气候变化事实与影响
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作者单位: Earth Science and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
Recommended Citation:
Bangalath H.K.,Stenchikov G.. Sensitivity of the Middle East-North African tropical rainbelt to dust shortwave absorption: A high-resolution AGCM experiment[J]. Journal of Climate,2016-01-01,29(19)