气候变化领域集成服务门户(CCPortal): Characterizing drying in the south American monsoon onset season with the moist static energy budget

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DOI	10.1175/JCLI-D-20-0217.1
	Characterizing drying in the south American monsoon onset season with the moist static energy budget
	Smyth J.E.; Ming Y.
发表日期	2021
ISSN	0894-8755
起始页码	9735
结束页码	9748
卷号	33 期号:22
英文摘要	The tropical atmospheric circulation and attendant rainfall exhibit seasonally dependent responses to increasing temperatures. Understanding changes in the South American monsoon system is of particular interest given the sensitivity of the southern Amazon rainforest to changes in dry season length. We utilize the latest Geophysical Fluid Dynamics Laboratory Atmospheric Model (GFDL AM4) to analyze the response of the South American monsoon to uniform sea surface temperature (SST) warming. SST warming is a poorly understood yet impactful component of greenhouse gas-induced climate change. Region-mean rainfall declines by 11%, and net precipitation (precipitation minus evaporation) declines by 40%, during the monsoon onset season (September-November), producing a more severe dry season. The column-integrated moist static energy (MSE) budget helps elucidate the physical mechanisms of the simulated drying. Based on the seasonal analysis, precipitation reductions tend to occur when 1) a convecting region's climatological MSE export is dominated by horizontal rather than vertical advection, and 2) the horizontal MSE advection increases in the perturbed climate, impeding ascent. On a synoptic scale, the South American low-level jet strengthens and exports more moisture from the monsoon sector, exacerbating spring drying. © 2020 American Meteorological Society. All rights reserved.
英文关键词	Advection; Atmospheric movements; Atmospheric thermodynamics; Budget control; Climate change; Drought; Drying; Greenhouse gases; Rain; Surface waters; Amazon rain forest; Atmospheric circulation; Geophysical fluid dynamics laboratories; Increasing temperatures; Moist static energy; Physical mechanism; Sea surface temperature (SST); Vertical advection; Oceanography; climate change; dry season; energy budget; monsoon; precipitation (climatology); rainfall; sea surface temperature; Amazonia
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/170917
作者单位	Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, United States
推荐引用方式 GB/T 7714	Smyth J.E.,Ming Y.. Characterizing drying in the south American monsoon onset season with the moist static energy budget[J],2021,33(22).
APA	Smyth J.E.,&Ming Y..(2021).Characterizing drying in the south American monsoon onset season with the moist static energy budget.Journal of Climate,33(22).
MLA	Smyth J.E.,et al."Characterizing drying in the south American monsoon onset season with the moist static energy budget".Journal of Climate 33.22(2021).