气候变化领域集成服务门户(CCPortal): Competing Topographic Mechanisms for the Summer Indo-Asian Monsoon

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DOI	10.1029/2019GL085112
	Competing Topographic Mechanisms for the Summer Indo-Asian Monsoon
	Acosta R.P.; Huber M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:3
英文摘要	The Indo-Asian Monsoon (IAM) has changed as the topographies of Asia were assembled into their current configuration. Understanding complex interactions between topography and the IAM through time has been hampered, in part, by poorly resolved topography and atmospheric dynamics in climate models. Here, we employ high-resolution (0.23° × 0.31°) global climate simulations, to more accurately capture these interactions. We find that the Himalayas and Tibet primarily redirect the onshore moisture transport and produce local orographic precipitation. The Iranian Plateau is the primary gatekeeper, insulating the pool of high-enthalpy air in the Indo-Gangetic Plain (IGP) from westerly low-enthalpy advection. But, even when such high-enthalpy air exists along the IGP, vigorous precipitation in the region (poleward of 25°N) still requires orographic steering and lifting. The large-scale circulations—largely governed by sea surface temperature gradients—robustly advect water vapor onshore regardless of topography. Thus, neither topography nor localized enthalpy air drives onshore monsoon flow. © 2020. The Authors.
英文关键词	Atmospheric movements; Atmospheric thermodynamics; Climate models; Enthalpy; Oceanography; Surface waters; Asian monsoon; High resolution climate model; Himalayan Mountains; Indian monsoon; Tibetan Plateau; Topography; Pyronia tithonus
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170736
作者单位	Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, United States
推荐引用方式 GB/T 7714	Acosta R.P.,Huber M.. Competing Topographic Mechanisms for the Summer Indo-Asian Monsoon[J],2020,47(3).
APA	Acosta R.P.,&Huber M..(2020).Competing Topographic Mechanisms for the Summer Indo-Asian Monsoon.Geophysical Research Letters,47(3).
MLA	Acosta R.P.,et al."Competing Topographic Mechanisms for the Summer Indo-Asian Monsoon".Geophysical Research Letters 47.3(2020).