Sustained Water Storage in Horn of Africa Drylands Dominated by Seasonal Rainfall Extremes
Sustained Water Storage in Horn of Africa Drylands Dominated by Seasonal Rainfall Extremes
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DOI：
10.1029/2022gl099299
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发表时间：
2022-10
影响因子：
5.2
通讯作者：
Markus Adloff;M. Singer;David A. MacLeod;K. Michaelides;N. Mehrnegar;Eleanor Hansford;C. Funk;D. Mitchell
中科院分区：
文献类型：
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作者：
Markus Adloff;M. Singer;David A. MacLeod;K. Michaelides;N. Mehrnegar;Eleanor Hansford;C. Funk;D. Mitchell
非洲之角干旱地区的农村社区越来越容易受到多季干旱的影响，因为他们的生计严重依赖季节性降雨。我们分析了多个观测降雨数据集，以了解平均和极端季节降雨的最近十年趋势，以及HAD各次区域两个关键降雨季节产生的卫星衍生陆地储水量和土壤湿度趋势。我们发现，尽管3月至4月至5月的总降雨量减少，但民政事务总署的总蓄水量却增加了。这一趋势与季节总量密切相关，特别是与2003年至2016年两个主要HAD雨季的极端降雨量密切相关。我们进一步表明，与印度洋偶极事件相关的10月至11月至12月高强度降雨导致储水量最大的季节性增加，并持续多年。这些研究结果表明，在HAD开发地下水资源可以抵消或减轻日益常见的干旱的影响。
Rural communities in the Horn of Africa Drylands (HADs) are increasingly vulnerable to multi‐season droughts due to the strong dependence of livelihoods on seasonal rainfall. We analyzed multiple observational rainfall data sets for recent decadal trends in mean and extreme seasonal rainfall, as well as satellite‐derived terrestrial water storage and soil moisture trends arising from two key rainfall seasons across various subregions of HAD. We show that, despite decreases in total March‐April‐May rainfall, total water storage in the HAD has increased. This trend correlates strongly with seasonal totals and especially with extreme rainfall in the two dominant HAD rainy seasons between 2003 and 2016. We further show that high‐intensity October‐November‐December rainfall associated with positive Indian Ocean Dipole events lead to the largest seasonal increases in water storage that persist over multiple years. These findings suggest that developing groundwater resources in HAD could offset or mitigate the impacts of increasingly common droughts.