气候变化领域集成服务门户(CCPortal): Mechanisms of the decadal variability of monsoon rainfall in the southern Tibetan Plateau

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DOI	10.1088/1748-9326/abcb36
	Mechanisms of the decadal variability of monsoon rainfall in the southern Tibetan Plateau
	Yue, Siyu; Wang, Bin; Yang, Kun; Xie, Zhiling; Lu, Hui; He, Jie
通讯作者	Yang, K (通讯作者)
发表日期	2021
ISSN	1748-9326
卷号	16 期号:1
英文摘要	The Tibetan Plateau (TP), as a whole, has undergone a moistening process since the late 1990s. However, the southern Tibetan Plateau (STP) is an exception, where summer monsoon precipitation amount has decreased, and lakes have shrunk. The cause for the precipitation decrease is not clear yet. Here we show that the monsoon (June to September) mean precipitation changes in the STP from 1979 to 2018 features a decadal variation component with a peak of around 10 years that is superposed on an upward 'trend' from 1979 to 1998 and a downward 'trend' afterward. We find that the decadal variation of the STP precipitation is associated with a large-scale dipolar sea surface temperature (SST) pattern between the equatorial central Pacific and the Indo-Pacific warm pool. A wet STP corresponds to negative SST anomaly in the equatorial central Pacific and positive SST anomaly in the Indo-Pacific warm pool. This equatorial SST gradient in the western Pacific generates pronounced easterly anomalies and a dipolar rainfall anomaly (i.e. a positive rainfall anomaly over the Maritime Continent and a negative anomaly in the equatorial western and central Pacific). Due to less precipitation over the equatorial western Pacific, the suppressed heat source appears to excite an anomalous anticyclonic band along 15-20 degrees N extending from the Philippine Sea to the Bay of Bengal by emanating westward propagating descending transient Rossby waves. The low-level anticyclonic circulation over the Bay of Bengal further enhances northward moisture transport toward the STP and promote upward motion in the STP through changing local meridional circulation. Besides, the linearized atmospheric general circulation model experiments demonstrate that the dipole heating source can generate a high-pressure zone under the control of anticyclone over the western Pacific, which can extend westward to the Indian monsoon region.
关键词	FREQUENCY EQUATORIAL WAVES SHEARED ZONAL FLOW INLAND LAKE PRECIPITATION GROWTH WATER
英文关键词	southern Tibetan Plateau; Asian monsoon; decadal variability; precipitation change
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000600800000001
来源期刊	ENVIRONMENTAL RESEARCH LETTERS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260353
推荐引用方式 GB/T 7714	Yue, Siyu,Wang, Bin,Yang, Kun,et al. Mechanisms of the decadal variability of monsoon rainfall in the southern Tibetan Plateau[J]. 中国科学院青藏高原研究所,2021,16(1).
APA	Yue, Siyu,Wang, Bin,Yang, Kun,Xie, Zhiling,Lu, Hui,&He, Jie.(2021).Mechanisms of the decadal variability of monsoon rainfall in the southern Tibetan Plateau.ENVIRONMENTAL RESEARCH LETTERS,16(1).
MLA	Yue, Siyu,et al."Mechanisms of the decadal variability of monsoon rainfall in the southern Tibetan Plateau".ENVIRONMENTAL RESEARCH LETTERS 16.1(2021).