气候变化领域集成服务门户(CCPortal): Low Pressure Systems and Extreme Precipitation in Southeast and East Asian Monsoon Regions

CCPortal

DOI	10.1175/JCLI-D-20-0206.1
	Low Pressure Systems and Extreme Precipitation in Southeast and East Asian Monsoon Regions
	You Y.; Ting M.
发表日期	2021
ISSN	0894-8755
起始页码	1147
结束页码	1162
卷号	34 期号:3
英文摘要	Understanding the physical mechanisms behind the secular trends of summer rainfall extremes over the heavily populated Southeast and East Asian monsoon regions is not only of scientific importance but also of considerable socioeconomic implications. In this study, the relevance of the excessive-rain-producing low pressure systems (LPSs) to extreme rainfall is quantified. Using an objective feature-tracking algorithm, the synoptic-scale LPSs are identified and tracked in the 40-yr ECMWF interim reanalysis. The region experiences approximately 16 terrestrial and 18 marine LPSs each summer. The terrestrial LPSs form near the downwind side of the Tibetan Plateau and travel northeastward toward jet latitudes. The marine LPSs form over the western North Pacific Ocean and migrate along the western periphery of the subtropical high. While both types of LPSs account for a large portion of upper-tail rainfall, the terrestrial LPSs predominantly impact the extreme rainfall over inland areas, and the marine LPSs primarily affect the coastal regions where they frequently make landfall. The historical extreme rainfall trend during 1979–2018 aligns with the changes in LPS tracks. The decreasing number of northeastward-moving terrestrial LPSs leads to an extreme rainfall dipole with negative trends in north-central China and positive trends in southern China, while the increasing number of northward-recurving marine LPSs enhances the extreme rainfall in the eastern China coast but suppresses it over the South China Sea. These trends are driven dynamically by the weakening of the monsoonal southwesterlies and the eastward retreat of the subtropical high, which might be attributable to anthropogenic forcings. © 2021 American Meteorological Society.
英文关键词	Atmospheric thermodynamics; Tropics; Coastal regions; East Asian monsoon; Extreme precipitation; Extreme rainfall; Feature tracking algorithm; Low pressure systems; Physical mechanism; Western North Pacific; Rain
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/170934
作者单位	Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Department of Earth and Environmental Sciences, Columbia University, Palisades, NY, United States
推荐引用方式 GB/T 7714	You Y.,Ting M.. Low Pressure Systems and Extreme Precipitation in Southeast and East Asian Monsoon Regions[J],2021,34(3).
APA	You Y.,&Ting M..(2021).Low Pressure Systems and Extreme Precipitation in Southeast and East Asian Monsoon Regions.Journal of Climate,34(3).
MLA	You Y.,et al."Low Pressure Systems and Extreme Precipitation in Southeast and East Asian Monsoon Regions".Journal of Climate 34.3(2021).