Dryness/wetness pattern over the Three-River Headwater Region: Variation characteristic, causes, and drought risks

doi:10.1002/joc.6413

	Dryness/wetness pattern over the Three-River Headwater Region: Variation characteristic, causes, and drought risks
	Li, Sisi 1,2; Yao, Zhijun 1; Wang, Rui 1; Liu, Zhaofei 1
刊名	INTERNATIONAL JOURNAL OF CLIMATOLOGY
	2019-12-04
页码	17
关键词	drought duration ENSO reference evapotranspiration standardized precipitation evapotranspiration index Three-River Headwater Region
ISSN号	0899-8418
DOI	10.1002/joc.6413
通讯作者	Liu, Zhaofei(zfliu@igsnrr.ac.cn)
英文摘要	The dryness/wetness patterns are a significant reference for stakeholders in developing reasonable strategies in regard to water resource management, prediction, prevention of extreme events, and management of agricultural activities; however, no attempts have been made to systematically quantify the dryness/wetness patterns and drought conditions over the Three-River Headwater Region (TRHR) of China, where the ecosystem is highly sensitive to climate change. The spatio-temporal characteristics of dryness/wetness for TRHR, as well as the reference evapotranspiration (ETr), precipitation (Pre), and drought risk, were all investigated for the period of 1961-2015. Using the methods of FAO-56 Penman-Monteith (FAO-56), standardized precipitation evapotranspiration index (SPEI), the Manner-Kendall (M-K) test, Pettitt test, factor contribution rate, and correlation analysis, the variation in the patterns of dryness/wetness, ETr, and Pre, and the causes behind dryness/wetness were discussed. Results indicated that the TRHR underwent a wetting tendency, which was characterized by decreasing ETr and increasing Pre based on the SPEI-12M during 1961-2015. Moreover, 1971-1980 was the driest period, while 2001-2015 was the wettest period. A significant difference between seasons was detected in the dryness/wetness patterns during all study periods, as well as in extreme droughts. The TRHR underwent an overall wetting trend with 85% of the stations' SPEI-3M showing increased variation during spring, in contrast with the north-south distribution pattern of the dryness/wetness with variation in the SPEI during summer. Moreover, it can be seen that droughts with higher longest drought duration (LDD) and total drought duration (TDD) were mostly located on the edge of the eastern and northern TRHR. The influencing factors demonstrate the vital roles of Pre and ETr in generating variation in the dryness/wetness patterns of the southern and northern parts of the TRHR, respectively. There is evidence indicating that Nino3.4, North Atlantic oscillation, and Arctic oscillation played more important roles in the variation of dryness/wetness patterns and Pre in TRHR.
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences[XDA20060202] ; National Natural Science Foundation of China[41561144012] ; National Natural Science Foundation of China[41571027] ; National Natural Science Foundation of China[41601021]
WOS关键词	STANDARDIZED PRECIPITATION INDEX ; NORTH-ATLANTIC OSCILLATION ; YANGTZE-RIVER BASIN ; LARGE-SCALE CLIMATE ; POTENTIAL EVAPOTRANSPIRATION ; SPATIOTEMPORAL VARIATION ; SPATIAL CHARACTERISTICS ; METEOROLOGICAL DROUGHT ; MONGOLIAN PLATEAU ; TIBETAN PLATEAU
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	WILEY
WOS记录号	WOS:000500448800001
资助机构	Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/130066]
专题	中国科学院地理科学与资源研究所
通讯作者	Liu, Zhaofei
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Li, Sisi,Yao, Zhijun,Wang, Rui,et al. Dryness/wetness pattern over the Three-River Headwater Region: Variation characteristic, causes, and drought risks[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2019:17.
APA	Li, Sisi,Yao, Zhijun,Wang, Rui,&Liu, Zhaofei.(2019).Dryness/wetness pattern over the Three-River Headwater Region: Variation characteristic, causes, and drought risks.INTERNATIONAL JOURNAL OF CLIMATOLOGY,17.
MLA	Li, Sisi,et al."Dryness/wetness pattern over the Three-River Headwater Region: Variation characteristic, causes, and drought risks".INTERNATIONAL JOURNAL OF CLIMATOLOGY (2019):17.