Knowledge Resource Center for Ecological Environment in Arid Area
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
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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). |
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