气候变化领域集成服务门户(CCPortal): Drought severity across Africa: a comparative analysis of multi-source precipitation datasets

CCPortal

DOI	10.1007/s11069-024-06604-2
	Drought severity across Africa: a comparative analysis of multi-source precipitation datasets
	Sian, Kenny Thiam Choy Lim Kam; Onyutha, Charles; Ayugi, Brian Odhiambo; Njouenwet, Ibrahim; Ongoma, Victor
发表日期	2024
ISSN	0921-030X
EISSN	1573-0840
英文摘要	An accurate analysis of climate extremes is essential for impact assessment and devising appropriate adaptation measures. There is an urgent need to assess precipitation products in capturing the increasing occurrence of climate extremes. This study evaluates the ability of 20 observational datasets, including gauge-based, satellite-based and reanalyses, in representing different drought severity (moderate, severe and extreme drought) over Africa and its nine sub-regions at varying time scales (3-, 6- and 12-months) during 1983-2014. Drought is represented using the Standardized Precipitation Index (SPI). The results demonstrate that while most datasets are suitable for drought studies over the continent, the African Rainfall Climatology version 2 (ARC2) and Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks Climate Data Records (PERSIANN_CDR_v1r1) are less fitted for such investigations. Moreover, regions such as the Sahara (SAH), Central Africa (CAF) and North Eastern Africa (NEAF) show a larger disparity among the datasets, requiring more caution when selecting a dataset for use in such areas. Generally, the datasets present low agreement toward the lower end of the range (5-30%) because the individual datasets estimate varying drought severities at different grids and months. This is observed in the coefficient of variation of 20-25% of the datasets falling outside the +/- 1 standard deviation range. Therefore, using an ensemble to represent the datasets remains an indispensable tool. The datasets present better agreement in the timing of drought events than the spatial distribution. The findings provide valuable insights into the complexity of drought assessment using diverse precipitation datasets. Furthermore, the results highlight the significance of considering spatial and temporal dimensions, as datasets may capture drought events at varying locations and times, revealing subtle variations in drought impact.
英文关键词	Ensemble mean; Gauge-based products; Satellite products; Reanalysis products; Standardized Precipitation Index
语种	英语
WOS研究方向	Geology ; Meteorology & Atmospheric Sciences ; Water Resources
WOS类目	Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Water Resources
WOS记录号	WOS:001208662800001
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/303422
作者单位	Wuxi University; Seoul National University of Science & Technology; University of Yaounde I; Mohammed VI Polytechnic University
推荐引用方式 GB/T 7714	Sian, Kenny Thiam Choy Lim Kam,Onyutha, Charles,Ayugi, Brian Odhiambo,et al. Drought severity across Africa: a comparative analysis of multi-source precipitation datasets[J],2024.
APA	Sian, Kenny Thiam Choy Lim Kam,Onyutha, Charles,Ayugi, Brian Odhiambo,Njouenwet, Ibrahim,&Ongoma, Victor.(2024).Drought severity across Africa: a comparative analysis of multi-source precipitation datasets.NATURAL HAZARDS.
MLA	Sian, Kenny Thiam Choy Lim Kam,et al."Drought severity across Africa: a comparative analysis of multi-source precipitation datasets".NATURAL HAZARDS (2024).