干旱区生态环境知识资源中心(Arid): Extreme precipitation events during 1960-2011 for the Northwest China: space-time changes and possible causes

Arid

DOI	10.1007/s00704-018-2645-8
	Extreme precipitation events during 1960-2011 for the Northwest China: space-time changes and possible causes
	Wang, Huailiang 1; Gao, Tao 2,3; Xie, Lian 3
通讯作者	Gao, Tao
来源期刊	THEORETICAL AND APPLIED CLIMATOLOGY
ISSN	0177-798X
EISSN	1434-4483
出版年	2019
卷号	137 期号:1-2 页码:977-995
英文摘要	Spatial and temporal patterns in precipitation indices across Northwest China (NWC) during 1960-2011 were investigated using 11 previously defined indices. Results show that more than 50% of stations for wet-related indices exhibit increasing trends and the largest increases appear in winter, while 72.1% of stations display decreasing trends for consecutive dry days. The observing sites with positive trends are mainly distributed over mid-western NWC and northwestern Xinjiang, while the declining trends are concentrated in eastern NWC. Very wet days account for 23% of the total rainfall on average, combined with similar patterns of spatial distribution between annual total rainfall and precipitation extremes, suggesting that extreme, rather than moderate, precipitation moderates the variations in total rainfall. After the mid-1980s, the NWC exhibits a wetting tendency, and precipitation extremes tend to increase with larger magnitudes and fluctuations. During 1987-2011, the prevailing eastward wind field anomalies at 850hPa and statistically significant increasing trends of geopotential height are found over the Eurasian continent from spring to autumn, together with enhanced anticyclonic circulation near 47 degrees N and 100 degrees E, providing favorable conditions for the occurrence of extreme precipitation events over NWC. While the circulation pattern in winter is distinct compared with other seasons, a convergence between eastward wind anomalies and southeasterly winds favors significantly positive increases in precipitation extremes. The well-organized wave train-like structures originated from the North Atlantic travel through Europe and central Asia and impact the precipitation extremes over NWC from spring to autumn during 1987-2011. Similar to wind field anomalies, the southeasterly water vapor fluxes are remarkable in winter. Generally, the approximately opposite circulation patterns dominate during 1960-1986 in comparison with those during 1987-2011.
类型	Article
语种	英语
国家	Peoples R China ; USA
收录类别	SCI-E
WOS记录号	WOS:000475737500066
WOS关键词	ARID REGION ; INTENSE PRECIPITATION ; DAILY TEMPERATURE ; CLIMATE EXTREMES ; TEMPORAL TRENDS ; FREQUENCY ; MONSOON ; ASSOCIATION ; OSCILLATION ; VARIABILITY
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/219094
作者单位	1.Heze Univ, Sch Business, Heze 274000, Peoples R China; 2.Heze Univ, Coll Urban Construct, Heze 274000, Peoples R China; 3.North Carolina State Univ, Dept Marine Earth & Atmospher Sci, Raleigh, NC 27695 USA
推荐引用方式 GB/T 7714	Wang, Huailiang,Gao, Tao,Xie, Lian. Extreme precipitation events during 1960-2011 for the Northwest China: space-time changes and possible causes[J],2019,137(1-2):977-995.
APA	Wang, Huailiang,Gao, Tao,&Xie, Lian.(2019).Extreme precipitation events during 1960-2011 for the Northwest China: space-time changes and possible causes.THEORETICAL AND APPLIED CLIMATOLOGY,137(1-2),977-995.
MLA	Wang, Huailiang,et al."Extreme precipitation events during 1960-2011 for the Northwest China: space-time changes and possible causes".THEORETICAL AND APPLIED CLIMATOLOGY 137.1-2(2019):977-995.