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DOI	10.1088/1748-9326/ac16a2
	Validating commonly used drought indicators in Kenya
	Bowell, Andrew; Salakpi, Edward E.; Guigma, Kiswendsida; Muthoka, James M.; Mwangi, John; Rowhani, Pedram
通讯作者	Rowhani, P (corresponding author), Univ Sussex, Sch Global Studies, Dept Geog, Brighton BN1 9QJ, E Sussex, England.
来源期刊	ENVIRONMENTAL RESEARCH LETTERS
ISSN	1748-9326
出版年	2021
卷号	16 期号:8
英文摘要	Drought is a complex natural hazard that can occur in any climate and affect every aspect of society. To better prepare and mitigate the impacts of drought, various indicators can be applied to monitor and forecast its onset, intensity, and severity. Though widely used, little is known about the efficacy of these indicators which restricts their role in important decisions. Here, we provide the first validation of 11 commonly-used drought indicators by comparing them to pasture and browse condition data collected on the ground in Kenya. These ground-based data provide an absolute and relative assessment of the conditions, similar to some of the drought indicators. Focusing on grass and shrublands of the arid and semi-arid lands, we demonstrate there are strong relationships between ground-based pasture and browse conditions, and satellite-based drought indicators. The soil adjusted vegetation index has the best relationship, achieving a mean r2 score of 0.70 when fitted against absolute pasture condition. Similarly, the 3-month vegetation health index reached a mean r2 score of 0.62 when fitted against a relative pasture condition. In addition, we investigated the Kenya-wide drought onset threshold for the 3-month average vegetation condition index (VCI3M; VCI3M < 35), which is used by the country's drought early warning system. Our results show large disparities in thresholds across different counties. Understanding these relationships and thresholds are integral to developing effective and efficient drought early warning systems. Our work offers evidence for the effectiveness of some of these indicators as well as practical thresholds for their use.
英文关键词	NDVI VCI Earth Observation Food Security Early Warning Systems
类型	Article
语种	英语
开放获取类型	gold, Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000685177300001
WOS关键词	VEGETATION INDEX ; YIELD ; CHALLENGES ; SECURITY ; SYSTEMS
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363154
作者单位	[Bowell, Andrew; Guigma, Kiswendsida; Muthoka, James M.; Rowhani, Pedram] Univ Sussex, Sch Global Studies, Dept Geog, Brighton BN1 9QJ, E Sussex, England; [Salakpi, Edward E.] Univ Sussex, Dept Phys & Astron, DISCUS, Brighton BN1 9QH, E Sussex, England; [Mwangi, John] Natl Drought Management Author NDMA, Lonrho House, Nairobi, Kenya
推荐引用方式 GB/T 7714	Bowell, Andrew,Salakpi, Edward E.,Guigma, Kiswendsida,et al. Validating commonly used drought indicators in Kenya[J],2021,16(8).
APA	Bowell, Andrew,Salakpi, Edward E.,Guigma, Kiswendsida,Muthoka, James M.,Mwangi, John,&Rowhani, Pedram.(2021).Validating commonly used drought indicators in Kenya.ENVIRONMENTAL RESEARCH LETTERS,16(8).
MLA	Bowell, Andrew,et al."Validating commonly used drought indicators in Kenya".ENVIRONMENTAL RESEARCH LETTERS 16.8(2021).