气候变化领域集成服务门户(CCPortal): Causes of interdecadal increase in the intraseasonal rainfall variability over Southern China around the Early 1990s

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DOI	10.1175/JCLI-D-20-0047.1
	Causes of interdecadal increase in the intraseasonal rainfall variability over Southern China around the Early 1990s
	Cheng Y.; Wang L.; Li T.
发表日期	2020
ISSN	0894-8755
起始页码	9481
结束页码	9496
卷号	33 期号:21
英文摘要	The southern China (SC) summer rainfall exhibits prominent intraseasonal variability, which exhibits a significant increase in the early 1990s with the turning point at 1993. The SC intraseasonal rainfall events could be divided into three categories according to different propagations, including the southward-propagating (SP) events, the northwestward-propagating (NWP) events, and the northward-propagating (NP) events. This study explores the causes of the observed interdecadal increase in the intraseasonal rainfall variability over SC by comparing the SC intraseasonal rainfall events of each category between the former decadal period (P1) and the later decadal period (P2). The result indicates that such interdecadal change is due to the more frequent NP events coming from the South China Sea (SCS). Based on the moisture and vorticity budget analysis, it is revealed that the summer mean southerly wind in the middle to lower troposphere is the dominant factor of the northward propagation over the SCS, as it could induce positive meridional moisture and vorticity advection anomalies ahead of the convection. A marked interdecadal enhancement of the summer mean southerly wind over the SCS is the cause of more frequent occurrence of NP events over SC, as it provides more favorable conditions for the northward propagation. The change of the atmospheric instability over the SCS where the NP convection perturbation originates was also investigated, but no significant change was found. © 2020 American Meteorological Society.
英文关键词	Budget control; Crack propagation; Moisture; Vorticity; Favorable conditions; Interdecadal changes; Intraseasonal variability; Lower troposphere; Rainfall variability; South China sea; Three categories; Vorticity advection; Rain; atmospheric convection; decadal variation; frequency analysis; monsoon; precipitation intensity; seasonal variation; vorticity; Pacific Ocean; South China Sea
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171056
作者单位	Key Laboratory of Meteorological Disaster, Ministry of Education (KLME), Joint International Research Laboratory of Climate and Environmental Change (ILCEC), Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China; Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; International Pacific Research Center, University of Hawai'i at Manoa, Honolulu, HI, United States
推荐引用方式 GB/T 7714	Cheng Y.,Wang L.,Li T.. Causes of interdecadal increase in the intraseasonal rainfall variability over Southern China around the Early 1990s[J],2020,33(21).
APA	Cheng Y.,Wang L.,&Li T..(2020).Causes of interdecadal increase in the intraseasonal rainfall variability over Southern China around the Early 1990s.Journal of Climate,33(21).
MLA	Cheng Y.,et al."Causes of interdecadal increase in the intraseasonal rainfall variability over Southern China around the Early 1990s".Journal of Climate 33.21(2020).