气候变化领域集成服务门户(CCPortal): Mechanism of winter precipitation variations in the southern arid Central Asia

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DOI	10.1002/joc.7480
	Mechanism of winter precipitation variations in the southern arid Central Asia
	Xie, Tingting; Huang, Wei; Feng, Song; Wang, Tao; Liu, Yan; Chen, Jianhui; Chen, Fahu
通讯作者	Huang, W (通讯作者)
发表日期	2022
ISSN	0899-8418
EISSN	1097-0088
起始页码	4477
结束页码	4490
卷号	42 期号:8
英文摘要	The southern arid central Asia (SACA, 35.25 degrees-45 degrees N, 46.25 degrees-80 degrees E) is influenced by Mediterranean type of climate with wet cool season. This study analysed the variations of winter precipitation and their mechanisms during 1979-2017. The results suggest the variations of winter precipitation in SACA are influenced by two water vapour pathways, which are closely linked to a low-latitude high-pressure anomaly near Indian subcontinent and the mid-high latitude North Atlantic Oscillation (NAO), respectively. Specifically, at low latitudes, the northern Indian Ocean heated by El Nino causes the anomalous intensification of the subtropical high throughout the low latitude region, especially over the Indian subcontinent, resulting in increased water vapour transport from the northern Indian Ocean to SACA. This result of low latitude is also supported by model simulations. At middle and high latitudes, the negative NAO phase leads to a southward displacement of the water vapour pathway and carries water vapour to pass over number of upwind water bodies, resulting in the transport of more westerly-associated water vapour to SACA. Further analysis showed that there is a northwest-southeast teleconnection wave train, from the North Atlantic to Central Asia and to the Indian subcontinent, which allows wave fluxes originating in the North Atlantic and the northern Indian Ocean to propagate from high and low latitudes, respectively, to the study area. At the same time, high-latitude cold air advection, brought by the low-pressure system in Central Asia, converges with the flow of warm water vapour from the low-latitude northern Indian Ocean, generating an ascending motion and reducing atmospheric static stability, and thereby lead to increasing precipitation in SACA. Therefore, the key to determining the origin of precipitation variations in SACA is understanding the interaction of large-scale circulation systems at low and mid-high latitudes. Key words arid Central Asia, precipitation, dynamic mechanism
关键词	SOUTHWEST ASIA CLIMATE-CHANGE LA-NINA DRYLANDS ENSO
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000728313900001
来源期刊	INTERNATIONAL JOURNAL OF CLIMATOLOGY
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/260656
推荐引用方式 GB/T 7714	Xie, Tingting,Huang, Wei,Feng, Song,et al. Mechanism of winter precipitation variations in the southern arid Central Asia[J]. 中国科学院青藏高原研究所,2022,42(8).
APA	Xie, Tingting.,Huang, Wei.,Feng, Song.,Wang, Tao.,Liu, Yan.,...&Chen, Fahu.(2022).Mechanism of winter precipitation variations in the southern arid Central Asia.INTERNATIONAL JOURNAL OF CLIMATOLOGY,42(8).
MLA	Xie, Tingting,et al."Mechanism of winter precipitation variations in the southern arid Central Asia".INTERNATIONAL JOURNAL OF CLIMATOLOGY 42.8(2022).