气候变化领域集成服务门户(CCPortal): Projected changes in South Asian monsoon low pressure systems

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DOI	10.1175/JCLI-D-20-0168.1
	Projected changes in South Asian monsoon low pressure systems
	Dong W.; Ming Y.; Ramaswamy V.
发表日期	2020
ISSN	0894-8755
起始页码	7275
结束页码	7287
卷号	33 期号:17
英文摘要	Monsoon low pressure systems (MLPSs) are among the most important synoptic-scale disturbances of the South Asian summer monsoon. Potential changes in their characteristics in a warmer climate would have broad societal impacts. Yet, the findings from a few existing studies are inconclusive. We use the Geophysical Fluid Dynamics Laboratory (GFDL) coupled climate model CM4.0 to examine the projected changes in the simulated MLPS activity under a future emission scenario. It is shown that CM4.0 can skillfully simulate the number, genesis location, intensity, and lifetime of MLPSs. Global warming gives rise to a significant decrease in MLPS activity. An analysis of several large-scale environmental variables, both dynamic and thermodynamic, suggests that the decrease in MLPS activity can be attributed mainly to a reduction in low-level relative vorticity over the core genesis region. The decreased vorticity is consistent with weaker large-scale ascent, which leads to less vorticity production through the stretching term in the vorticity equation. Assuming a fixed radius of influence, the projected reduction in MLPSs would significantly lower the associated precipitation over north-central India, despite an overall increase in mean precipitation. © 2020 American Meteorological Society.
英文关键词	Atmospheric thermodynamics; Global warming; Vorticity; Asian summer monsoons; Coupled climate model; Environmental variables; Geophysical fluid dynamics laboratories; Low pressure systems; Mean precipitation; Radius of influences; Relative vorticity; Climate models; climate prediction; low pressure; monsoon; precipitation (climatology); synoptic meteorology; thermodynamics; warming; India
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/171146
作者单位	Geophysical Fluid Dynamics Laboratory, NOAA, Princeton, NJ, United States; Cooperative Programs for the Advancement of Earth System Science, University Corporation for Atmospheric Research, Boulder, CO, United States; Geophysical Fluid Dynamics Laboratory, NOAA, Princeton, NJ, United States
推荐引用方式 GB/T 7714	Dong W.,Ming Y.,Ramaswamy V.. Projected changes in South Asian monsoon low pressure systems[J],2020,33(17).
APA	Dong W.,Ming Y.,&Ramaswamy V..(2020).Projected changes in South Asian monsoon low pressure systems.Journal of Climate,33(17).
MLA	Dong W.,et al."Projected changes in South Asian monsoon low pressure systems".Journal of Climate 33.17(2020).