气候变化领域集成服务门户(CCPortal): Interannual relationship between intensity of rainfall intraseasonal oscillation and summer-mean rainfall over Yangtze River Basin in eastern China

CCPortal

DOI	10.1007/s00382-019-04680-w
	Interannual relationship between intensity of rainfall intraseasonal oscillation and summer-mean rainfall over Yangtze River Basin in eastern China
	Qi Y.; Li T.; Zhang R.; Chen Y.
发表日期	2019
ISSN	0930-7575
起始页码	3089
结束页码	3108
卷号	53 期号:2020-05-06
英文摘要	The analysis of observational rainfall shows that the intensity of rainfall intraseasonal oscillation (ISO) and the summer-mean rainfall over the middle-lower reaches of the Yangtze River Basin (YRB) exhibit a significant positive correlation during 1979–2007. A stronger (weaker) ISO variability is often associated with wet (dry) summer in the YRB. The composite ISOs in both the wet and dry summers are further analyzed. In the wet summers, the rainfall ISO in YRB is primarily associated with the northward propagation of a low-level cyclone-anticyclone pair from the tropics. Cyclonic vorticity and associated boundary layer convergence strengthen the rainfall in situ. In contrast, the rainfall ISO in YRB in the dry summers is primarily associated with the westward propagation of an anomalous anticyclone. Southerly flow to the west of the anomalous anticyclone enhances rainfall in YRB through anomalous moisture advection. In addition to the difference in ISO propagation, the background mean state also shows a marked difference. The diagnosis of water vapor flux budget shows that the convergence and advection of seasonal mean moisture play a critical role in maintenance of the intraseasonal rainfall in the YRB. A greater mean ascending motion and associated higher mean moisture in YRB in the wet summers favor greater intraseasonal rainfall variability in situ. The mean state difference is responsible for distinctive vertical structures of boundary layer vertical velocity. A possible feedback of the ISO to the summer-mean rainfall over the YRB is also discussed. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Intraseasonal oscillation; Summer rainfall; Yangtze River Basin
语种	英语
scopus关键词	annual variation; anticyclone; atmospheric moisture; boundary layer; climate oscillation; rainfall; summer; water vapor; China; Yangtze Basin
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146042
作者单位	State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China; Department of Atmospheric Sciences, International Pacific Research Center, University of Hawaii at Manoa, Honolulu, United States; Department of Atmospheric and Oceanic Sciences & Institute of Atmospheric Sciences, Fudan University, Shanghai, China
推荐引用方式 GB/T 7714	Qi Y.,Li T.,Zhang R.,et al. Interannual relationship between intensity of rainfall intraseasonal oscillation and summer-mean rainfall over Yangtze River Basin in eastern China[J],2019,53(2020-05-06).
APA	Qi Y.,Li T.,Zhang R.,&Chen Y..(2019).Interannual relationship between intensity of rainfall intraseasonal oscillation and summer-mean rainfall over Yangtze River Basin in eastern China.Climate Dynamics,53(2020-05-06).
MLA	Qi Y.,et al."Interannual relationship between intensity of rainfall intraseasonal oscillation and summer-mean rainfall over Yangtze River Basin in eastern China".Climate Dynamics 53.2020-05-06(2019).