Spatial and Temporal Variation of Drought Based on Satellite Derived Vegetation Condition Index in Nepal from 1982-2015

doi:10.3390/s19020430

	Spatial and Temporal Variation of Drought Based on Satellite Derived Vegetation Condition Index in Nepal from 1982-2015
	Baniya, Binod 1,2,3; Tang, Qiuhong 1,2; Xu, Ximeng 1,2; Haile, Gebremedhin Gebremeskel 1; Chhipi-Shrestha, Gyan 4
刊名	SENSORS
	2019-01-02
卷号	19 期号:2 页码:21
关键词	VCI drought exceedance probability climate Nepal
ISSN号	1424-8220
DOI	10.3390/s19020430
通讯作者	Tang, Qiuhong(tangqh@igsnrr.ac.cn)
英文摘要	Identification of drought is essential for many environmental and agricultural applications. To further understand drought, this study presented spatial and temporal variations of drought based on satellite derived Vegetation Condition Index (VCI) on annual (Jan-Dec), seasonal monsoon (Jun-Nov) and pre-monsoon (Mar-May) scales from 1982-2015 in Nepal. The Vegetation Condition Index (VCI) obtained from NOAA, AVHRR (National Oceanic and Atmospheric Administration, Advanced Very High Resolution Radiometer) and climate data from meteorological stations were used. VCI was used to grade the drought, and the Mann-Kendall test and linear trend analysis were conducted to examine drought trends and the Pearson correlation between VCI and climatic factors (i.e., temperature and precipitation) was also acquired. The results identified that severe drought was identified in 1982, 1984, 1985 and 2000 on all time scales. However, VCI has increased at the rate of 1.14 yr(-1) (p = 0.04), 1.31 yr(-1) (p = 0.03) and 0.77 yr(-1) (p = 0.77) on the annual, seasonal monsoon and pre-monsoon scales, respectively. These increased VCIs indicated decreases in drought. However, spatially, increased trends of drought were also found in some regions in Nepal. For instance, northern areas mainly in the Trans-Himalayan regions identified severe drought. The foothills and the lowlands of Terai (southern Nepal) experienced normal VCI, i.e., no drought. Similarly, the Anomaly Vegetation Condition Index (AVCI) was mostly negative before 2000 which indicated deficient soil moisture. The exceedance probability analysis results on the annual time scale showed that there was a 20% chance of occurring severe drought (VCI 35%) and a 35% chance of occurring normal drought (35% VCI 50%) in Nepal. Drought was also linked with climates in which temperature on the annual and seasonal monsoon scales was significant and positively correlated with VCI. Drought occurrence and trends in Nepal need to be further studied for comprehensive information and understanding.
资助项目	National Natural Science Foundation of China[41790424] ; National Natural Science Foundation of China[41730645] ; National Natural Science Foundation of China[41425002] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA20060402] ; International Partnership Program of the Chinese Academy of Sciences[131A11KYSB20170113]
WOS关键词	METEOROLOGICAL DROUGHT ; CENTRAL HIMALAYA ; CLIMATE ; NDVI ; TEMPERATURE ; TRENDS ; VCI ; RAJASTHAN ; RESPONSES ; IMPACT
WOS研究方向	Chemistry ; Electrochemistry ; Instruments & Instrumentation
语种	英语
出版者	MDPI
WOS记录号	WOS:000458569300213
资助机构	National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/49877]
专题	中国科学院地理科学与资源研究所
通讯作者	Tang, Qiuhong
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Tribhuvan Univ, Dept Environm Sci, Patan Multiple Campus, Kathmandu 44613, Nepal 4.Univ Laval, Ecole Super Amenagement Terr, 1628 Pavillon Savard, Quebec City, PQ G1K7P4, Canada
推荐引用方式 GB/T 7714	Baniya, Binod,Tang, Qiuhong,Xu, Ximeng,et al. Spatial and Temporal Variation of Drought Based on Satellite Derived Vegetation Condition Index in Nepal from 1982-2015[J]. SENSORS,2019,19(2):21.
APA	Baniya, Binod,Tang, Qiuhong,Xu, Ximeng,Haile, Gebremedhin Gebremeskel,&Chhipi-Shrestha, Gyan.(2019).Spatial and Temporal Variation of Drought Based on Satellite Derived Vegetation Condition Index in Nepal from 1982-2015.SENSORS,19(2),21.
MLA	Baniya, Binod,et al."Spatial and Temporal Variation of Drought Based on Satellite Derived Vegetation Condition Index in Nepal from 1982-2015".SENSORS 19.2(2019):21.