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DOI	10.1088/1748-9326/abdd57
	Is wetter better? Exploring agriculturally-relevant rainfall characteristics over four decades in the Sahel
	Porkka, Miina; Wang-Erlandsson, Lan; Destouni, Georgia; Ekman, Annica M. L.; Rockstrom, Johan; Gordon, Line J.
通讯作者	Porkka, M (corresponding author), Stockholm Univ, Stockholm Resilience Ctr, Stockholm, Sweden. ; Porkka, M (corresponding author), Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden. ; Porkka, M (corresponding author), Aalto Univ, Water & Dev Res Grp, Espoo, Finland.
来源期刊	ENVIRONMENTAL RESEARCH LETTERS
ISSN	1748-9326
出版年	2021
卷号	16 期号:3
英文摘要	The semi-arid Sahel is a global hotspot for poverty and malnutrition. Rainfed agriculture is the main source of food and income, making the well-being of rural population highly sensitive to rainfall variability. Studies have reported an upward trend in annual precipitation in the Sahel since the drought of the 1970s and early '80s, yet farmers have questioned improvements in conditions for agriculture, suggesting that intraseasonal dynamics play a crucial role. Using high-resolution daily precipitation data spanning 1981-2017 and focusing on agriculturally-relevant areas of the Sahel, we re-examined the extent of rainfall increase and investigated whether the increases have been accompanied by changes in two aspects of intraseasonal variability that have relevance for agriculture: rainy season duration and occurrence of prolonged dry spells during vulnerable crop growth stages. We found that annual rainfall increased across 56% of the region, but remained largely the same elsewhere. Rainy season duration increased almost exclusively in areas with upward trends in annual precipitation (23% of them). Association between annual rain and dry spell occurrence was less clear: increasing and decreasing frequencies of false starts (dry spells after first rains) and post-floral dry spells (towards the end of the season) were found to almost equal extent both in areas with positive and those with no significant trend in annual precipitation. Overall, improvements in at least two of the three intraseasonal variables (and no declines in any) were found in 10% of the region, while over a half of the area experienced declines in at least one intraseasonal variable, or no improvement in any. We conclude that rainfall conditions for agriculture have improved overall only in scattered areas across the Sahel since the 1980s, and increased annual rainfall is only weakly, if at all, associated with changes in the agriculturally-relevant intraseasonal rainfall characteristics.
英文关键词	Sahel precipitation rainy season dry spells trends agriculture
类型	Article
语种	英语
开放获取类型	gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000618028400001
WOS关键词	DRY-SPELL MITIGATION ; DRYLAND AGROECOSYSTEMS ; SEASONAL RAINFALL ; CENTRAL-AFRICA ; RAINY-SEASON ; WEST ; WATER ; VARIABILITY ; DROUGHT ; PRECIPITATION
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/2XILL650/347869
作者单位	[Porkka, Miina; Wang-Erlandsson, Lan; Rockstrom, Johan; Gordon, Line J.] Stockholm Univ, Stockholm Resilience Ctr, Stockholm, Sweden; [Destouni, Georgia] Stockholm Univ, Dept Phys Geog, Stockholm, Sweden; [Ekman, Annica M. L.] Stockholm Univ, Dept Meteorol, Stockholm, Sweden; [Porkka, Miina; Wang-Erlandsson, Lan; Destouni, Georgia; Ekman, Annica M. L.; Gordon, Line J.] Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden; [Porkka, Miina] Aalto Univ, Water & Dev Res Grp, Espoo, Finland; [Rockstrom, Johan] Potsdam Inst Climate Impact Res, Potsdam, Germany; [Rockstrom, Johan] Leibniz Assoc, Potsdam, Germany
推荐引用方式 GB/T 7714	Porkka, Miina,Wang-Erlandsson, Lan,Destouni, Georgia,et al. Is wetter better? Exploring agriculturally-relevant rainfall characteristics over four decades in the Sahel[J],2021,16(3).
APA	Porkka, Miina,Wang-Erlandsson, Lan,Destouni, Georgia,Ekman, Annica M. L.,Rockstrom, Johan,&Gordon, Line J..(2021).Is wetter better? Exploring agriculturally-relevant rainfall characteristics over four decades in the Sahel.ENVIRONMENTAL RESEARCH LETTERS,16(3).
MLA	Porkka, Miina,et al."Is wetter better? Exploring agriculturally-relevant rainfall characteristics over four decades in the Sahel".ENVIRONMENTAL RESEARCH LETTERS 16.3(2021).