气候变化领域集成服务门户(CCPortal): Quasi-biweekly impact of the atmospheric heat source over the Tibetan Plateau on summer rainfall in Eastern China

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DOI	10.1007/s00382-019-04798-x
	Quasi-biweekly impact of the atmospheric heat source over the Tibetan Plateau on summer rainfall in Eastern China
	Wang M.; Wang J.; Duan A.; Yang J.; Liu Y.
发表日期	2019
ISSN	0930-7575
起始页码	4489
结束页码	4504
卷号	53 期号:2020-07-08
英文摘要	We investigated the intraseasonal relationship between the atmospheric heat source over Tibetan Plateau (TP) and summer rainfall in eastern China. A quasi-biweekly oscillation (QBWO) is the common dominant periodicity over both the TP and eastern China. Crucially, the TP heat source QBWO leads rainfall QBWO over its downstream region by 2–8 days. The QBWO over the TP shows a significant eastward propagation. Phase composite further identified the specific propagation pathway: TP QBWO first propagates eastward to central China, southward to southern China, and then northeastward to the lower reaches of the Yangtze River with a zigzag propagating pathway. Mechanistically, the eastward propagation of the upper level divergence caused by the movement of the 200 hPa jet core and south Asian high contributes to the eastward propagation of the rainfall QBWO. Simultaneously, the eastward (westward) shift in the western north Pacific subtropical high causes deepening (flattening) of the monsoon trough and the occurrence of an anomalous cyclone (anticyclone) over the western north Pacific. An anomalous anticyclonic (cyclonic) circulation around the TP appears with the wet-to-dry (dry-to-wet) phase transition of the TP QBWO. Together, they play a crucial part in the southward (northeastward) movement of the QBWO. Further dynamic analysis indicates that the horizontal moisture advection acts on the whole eastward-propagating process of the QBWO, whereas the horizontal vorticity advection is only significant when QBWO is over the TP. This study shows that the fluctuations in TP heat source are important indicators in extended forecasts of summer rainfall in eastern China. © 2019, The Author(s).
英文关键词	Atmospheric circulation; Atmospheric heat source; Intraseasonal variation of precipitation; Quasi-biweekly oscillation; TP
语种	英语
scopus关键词	atmospheric circulation; heat source; periodicity; precipitation (climatology); quasi-biennial oscillation; rainfall; seasonal variation; summer; China; Qinghai-Xizang Plateau
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/145972
作者单位	Joint Center for Data Assimilation Research and Applications/Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center ON Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China; International Institute for Earth System Science, Nanjing University, Nanjing, China; State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; State Key Laboratory of Earth Surface Processes and Resource Ecology (ESPRE)/Academy of Disaster Reduction and Emergency Management Ministry of Civil Affairs and Ministry of Education, Faculty of Geographical Science, Beijing Normal University, Beijing, China
推荐引用方式 GB/T 7714	Wang M.,Wang J.,Duan A.,et al. Quasi-biweekly impact of the atmospheric heat source over the Tibetan Plateau on summer rainfall in Eastern China[J],2019,53(2020-07-08).
APA	Wang M.,Wang J.,Duan A.,Yang J.,&Liu Y..(2019).Quasi-biweekly impact of the atmospheric heat source over the Tibetan Plateau on summer rainfall in Eastern China.Climate Dynamics,53(2020-07-08).
MLA	Wang M.,et al."Quasi-biweekly impact of the atmospheric heat source over the Tibetan Plateau on summer rainfall in Eastern China".Climate Dynamics 53.2020-07-08(2019).