Spatial and temporal characteristics of droughts in the Northeast China Transect

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Spatial and temporal characteristics of droughts in the Northeast China Transect
	Wang, Xiaoxue; Shen, Huitao; Zhang, Wanjun; Cao, Jiansheng; Qi, Yongqing; Chen, Guopeng; Li, Xuyong
刊名	NATURAL HAZARDS
	2015-03
卷号	76 期号:1 页码:601-614
关键词	Precipitation Trend magnitude Spatial-temporal characteristics Cluster analysis Standardized precipitation index
英文摘要	In this study, drought trends and change magnitudes of the Northeast China Transect (NECT) were analyzed using the Mann-Kendall test and Theil-Sen's slope estimator. Meteorological data from 20 meteorological stations of NECT region from 1957 to 2012 were used. Results demonstrated that five stations had significant negative trends in precipitation. The magnitudes of the significant negative trends at the 95 % confidence level varied from -2.41 +/- 1.05 mm year(-1) at Tonghe station to -1.11 +/- 0.51 mm year(-1) at Qianguoerluosi station. Analysis of the seasonal precipitation series showed a mix of negative and positive trends. Many stations also exhibited strong contrasting seasonal trends that counterbalanced one other at the yearly level. In addition, cluster analysis based on discrete wavelet transform (DWT) was applied to the standard precipitation index (SPI) series. Results revealed three different and spatially well-defined subregions (east, center and west regions of NECT). Due to the decrease in precipitation from the east to the west, land use varies from forest regions in the east, to agriculture in the center, to pastoral areas in the west. Characteristics of drought events for each representative station of different subregions are explored using temporal evolution of the SPI values. Results showed that severe or extreme droughts occurred in 2001, 2003 and 2008 in Tonghe, 1980 and 2007 in Tongliao and 2005-2007 in East Ujimqin Banner. Results indicate that clustering analysis based on DWT has great potential for examining spatial coherence of regional drought, which was consistent with not only the precipitation spatial distribution but also the characteristics of land use in the study area. This study not only provides important information on drought variability in the NECT, but also provides useful information for improving water management strategies and planning agricultural practices.
研究领域[WOS]	Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Water Resources
WOS记录号	WOS:000350326200031
公开日期	2016-03-08
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/32382]
专题	生态环境研究中心_城市与区域生态国家重点实验室
推荐引用方式 GB/T 7714	Wang, Xiaoxue,Shen, Huitao,Zhang, Wanjun,et al. Spatial and temporal characteristics of droughts in the Northeast China Transect[J]. NATURAL HAZARDS,2015,76(1):601-614.
APA	Wang, Xiaoxue.,Shen, Huitao.,Zhang, Wanjun.,Cao, Jiansheng.,Qi, Yongqing.,...&Li, Xuyong.(2015).Spatial and temporal characteristics of droughts in the Northeast China Transect.NATURAL HAZARDS,76(1),601-614.
MLA	Wang, Xiaoxue,et al."Spatial and temporal characteristics of droughts in the Northeast China Transect".NATURAL HAZARDS 76.1(2015):601-614.