气候变化领域集成服务门户(CCPortal): Spatiotemporal characteristics of extreme droughts and their association with sea surface temperature over the Cauvery River basin, India

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DOI	10.1007/s11069-020-04270-8
	Spatiotemporal characteristics of extreme droughts and their association with sea surface temperature over the Cauvery River basin, India
	Jena P.; Kasiviswanathan K.S.; Azad S.
发表日期	2020
ISSN	0921030X
起始页码	2239
结束页码	2259
卷号	104 期号:3
英文摘要	Drought is a function of time as well as climate variables such as temperature and precipitation. The process of drought forming is slow, and it manifests at different time scales, which adversely affects the economy of a country. The identification and characterization of droughts at various spatiotemporal scales are of great importance. It helps in the planning and management of water resources, policymaking, and agribusiness industries. In the present paper, the Cauvery River basin is chosen as a study area to analyze the changes in the frequency distribution of extreme droughts and duration, with the combined effect of evapotranspiration and rainfall. The drought indices such as Standard Precipitation Index (SPI) and Standard Precipitation Evapotranspiration Index (SPEI) are implemented on monthly rainfall data and potential evapotranspiration of resolution 0.25° × 0.25° long./lat. for the period 1931–2010. The results reveal that the frequency of the extreme droughts over the basin has significantly increased over the post-era of global warming. The increased rate of extreme droughts is particularly evident in downstream of the basin, mainly due to the increase in temperature and deficit rainfall. Further, the implementation of continuous wavelet transform reveals that SPI at 3-(SPI-3) and 12-(SPI-12) month scale are associated with extended reconstruction of sea surface temperature (ERSST) in anti-phase and in-phase, respectively. It is concluded that the in-phase association of SPI-12 and ERSST enhances the drought situation compared to the anti-phase link of SPI-3 and ERSST. © 2020, Springer Nature B.V.
关键词	Drought intensity Extreme drought River basin SPEI SPI TBO Wavelet
英文关键词	drought; evapotranspiration; extreme event; rainfall; sea surface temperature; spatiotemporal analysis; wavelet analysis; Cauvery Basin; India
语种	英语
来源期刊	Natural Hazards
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/205748
作者单位	School of Basic Sciences, Indian Institute of Technology Mandi, Kamand, 175 005, India; Department of Water Resources Development and Management, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
推荐引用方式 GB/T 7714	Jena P.,Kasiviswanathan K.S.,Azad S.. Spatiotemporal characteristics of extreme droughts and their association with sea surface temperature over the Cauvery River basin, India[J],2020,104(3).
APA	Jena P.,Kasiviswanathan K.S.,&Azad S..(2020).Spatiotemporal characteristics of extreme droughts and their association with sea surface temperature over the Cauvery River basin, India.Natural Hazards,104(3).
MLA	Jena P.,et al."Spatiotemporal characteristics of extreme droughts and their association with sea surface temperature over the Cauvery River basin, India".Natural Hazards 104.3(2020).