气候变化领域集成服务门户(CCPortal): Heavy rain-producing terrestrial low pressure systems over the east Asian summer monsoon region: Evolution, energetics, and trend

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DOI	10.1175/JCLI-D-20-0667.1
	Heavy rain-producing terrestrial low pressure systems over the east Asian summer monsoon region: Evolution, energetics, and trend
	You Y.; Ting M.; Camargo S.J.
发表日期	2021
ISSN	08948755
起始页码	4539
结束页码	4552
卷号	34 期号:11
英文摘要	The synoptic low pressure systems (LPSs) formed over the downwind side of the Tibetan Plateau explain a substantial portion of summer rainfall extremes along their paths. Recent studies have found that the total extreme rainfall trend over the East Asian landmass, which features the ‘‘south flood–north drought’’ pattern, can be understood to a great extent by the changes in terrestrial LPSs. Yet, the energy sources fueling these storms and the environmental drivers of their long-term trends remain unclear. Utilizing a probabilistic clustering method, three clusters of terrestrial LPS tracks for the period 1979–2018 are identified. Besides the differences in trajectories that distinguish the clusters into northeastward-migrating and quasi-stationary types, prominent intercluster differences are found in the LPS evolution, energetics, and trends. The Lorenz energetics suggest that while condensational heating is indispensable for all three clusters, the migratory type, which has greater intensity and faster development, is more closely tied to baroclinicity. Nonetheless, the summer baroclinicity alone is not enough to sustain these LPSs as these storms dissipate quickly after propagating out of the humid monsoon region and into the drier extratropics. Over time, occurrences of migratory LPSs decrease, and those of quasi-stationary LPSs increase. Using a Poisson model that links the LPS genesis to local environmental conditions, the decreasing occurrence of migratory LPSs is shown to result from the weakened baroclinicity, whereas the increasing occurrence of quasi-stationary LPSs is primarily driven by enhanced relative humidity and reduced steering flow in the mid-to-lower troposphere over East Asia. © 2021 American Meteorological Society.
英文关键词	Asia; Extratropical cyclones; Monsoons; Rainfall; Subtropical cyclones; Tropical cyclones
语种	英语
scopus关键词	Atmospheric thermodynamics; Flood control; Storms; East Asian summer monsoon; Environmental conditions; Extreme rainfall; Low pressure systems; Lower troposphere; Probabilistic clustering; Quasi-stationary; Summer rainfall; Rain
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/178550
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.,Camargo S.J.. Heavy rain-producing terrestrial low pressure systems over the east Asian summer monsoon region: Evolution, energetics, and trend[J],2021,34(11).
APA	You Y.,Ting M.,&Camargo S.J..(2021).Heavy rain-producing terrestrial low pressure systems over the east Asian summer monsoon region: Evolution, energetics, and trend.Journal of Climate,34(11).
MLA	You Y.,et al."Heavy rain-producing terrestrial low pressure systems over the east Asian summer monsoon region: Evolution, energetics, and trend".Journal of Climate 34.11(2021).