干旱区生态环境知识资源中心(Arid): On the role of aerosol radiative effect in the wet season onset timing over the Congo rainforest during boreal autumn

Arid

DOI	10.5194/acp-21-12855-2021
	On the role of aerosol radiative effect in the wet season onset timing over the Congo rainforest during boreal autumn
	Chakraborty, Sudip; Jiang, Jonathon H.; Su, Hui; Fu, Rong
通讯作者	Chakraborty, S (corresponding author), CALTECH, Jet Prop Lab, Pasadena, CA 91125 USA.
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN	1680-7316
EISSN	1680-7324
出版年	2021
卷号	21 期号:17 页码:12855-12866
英文摘要	The boreal summer dry season length is reported to have been increasing in the last 3 decades over the Congo rainforest, which is the second-largest rainforest in the world. In some years, the wet season in boreal autumn starts early, while in others it arrives late. The mechanism behind such a change in the wet season onset date has not been investigated yet. Using multi-satellite data sets, we discover that the variation in aerosols in the dry season plays a major role in determining the subsequent wet season onset. Dry season aerosol optical depth (AOD) influences the strength of the southern African easterly jet (AEJ-S) and, thus, the onset of the wet season. Higher AOD associated with a higher dust mass flux reduces the net downward shortwave radiation and decreases the surface temperature over the Congo rainforest region, leading to a stronger meridional temperature gradient between the rainforest and the Kalahari Desert as early as in June. The latter, in turn, strengthens the AEJ-S, sets in an early and a stronger easterly flow, and leads to a stronger equatorward convergence and an early onset of the wet season in late August to early September. The mean AOD in the dry season over the region is strongly correlated (r = 0.7) with the timing of the subsequent wet season onset. Conversely, in low AOD years, the onset of the wet season over the Congo basin is delayed to mid-October.
类型	Article
语种	英语
开放获取类型	gold, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000692618900002
WOS关键词	WESTERN EQUATORIAL AFRICA ; CLIMATE ; EVOLUTION ; PATTERNS ; IMPACT ; JET
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
来源机构	University of California, Los Angeles
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/362649
作者单位	[Chakraborty, Sudip; Jiang, Jonathon H.; Su, Hui] CALTECH, Jet Prop Lab, Pasadena, CA 91125 USA; [Fu, Rong] Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA
推荐引用方式 GB/T 7714	Chakraborty, Sudip,Jiang, Jonathon H.,Su, Hui,et al. On the role of aerosol radiative effect in the wet season onset timing over the Congo rainforest during boreal autumn[J]. University of California, Los Angeles,2021,21(17):12855-12866.
APA	Chakraborty, Sudip,Jiang, Jonathon H.,Su, Hui,&Fu, Rong.(2021).On the role of aerosol radiative effect in the wet season onset timing over the Congo rainforest during boreal autumn.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(17),12855-12866.
MLA	Chakraborty, Sudip,et al."On the role of aerosol radiative effect in the wet season onset timing over the Congo rainforest during boreal autumn".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.17(2021):12855-12866.