气候变化领域集成服务门户(CCPortal): Regulation of the subseasonal variability of winter rainfall in South China by the diversity of El Niño Southern Oscillation

CCPortal

DOI	10.1007/s00382-020-05565-z
	Regulation of the subseasonal variability of winter rainfall in South China by the diversity of El Niño Southern Oscillation
	Guo L.; Zhu C.; Liu B.
发表日期	2021
ISSN	0930-7575
卷号	56 期号:2021-05-06
英文摘要	Winter precipitation over South China tends to increase with enhancement of the 10–30-day intraseasonal oscillation (ISO) during El Niño Southern Oscillation (ENSO) events from 1981 to 2017. This study shows that, in contrast with central Pacific El Niño and La Niña events, the 10–30-day ISO of rainfall particularly intensify during eastern Pacific (EP) El Niño events. The seasonal evolution of the anomalous circulation, indicated as the annual cycle (AC), bridges the slow-varying ENSO and the transient 10–30-day ISO of winter rainfall over South China. As to the AC component, the EP El Niño events not only enhance the Philippine Sea anticyclone to provide a wetter low-level background over South China, but develop the mid-latitude cyclone and westerly winds in the upper-level over East Asia by changing tropical convection. The moisture over South China further increases due to the low-level wind convergence on a 10–30-day timescale. In the upper troposphere, the AC component of the anomalous westerly redistributes the 10–30-day relative vorticity by modulating the subseasonal mid-latitude wave train to strengthen the positive vorticity advection and ascending motion over South China. Their collaboration amplifies the subseasonal variance of winter precipitation in situ. By contrast, the AC component of the upper level circulation at mid-latitudes is not well organized in other ENSO subsets, corresponding to their lack of influence on the ISO variability of rainfall over South China. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.
英文关键词	ENSO diversity; Scale interactions; Subseasonal variability; Winter rainfall in South China
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/183352
作者单位	State Key Laboratory of Severe Weather and Institute of Climate System, Chinese Academy of Meteorological Sciences, Beijing, 100081, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
推荐引用方式 GB/T 7714	Guo L.,Zhu C.,Liu B.. Regulation of the subseasonal variability of winter rainfall in South China by the diversity of El Niño Southern Oscillation[J],2021,56(2021-05-06).
APA	Guo L.,Zhu C.,&Liu B..(2021).Regulation of the subseasonal variability of winter rainfall in South China by the diversity of El Niño Southern Oscillation.Climate Dynamics,56(2021-05-06).
MLA	Guo L.,et al."Regulation of the subseasonal variability of winter rainfall in South China by the diversity of El Niño Southern Oscillation".Climate Dynamics 56.2021-05-06(2021).