Estimating groundwater recharge across Africa during 2003–2023 using GRACE-derived groundwater storage changes

IF 4.7 2区 地球科学 Q1 WATER RESOURCES Journal of Hydrology-Regional Studies Pub Date : 2024-11-04 DOI:10.1016/j.ejrh.2024.102046
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Abstract

Study Region:

Africa, with its diverse climatic zones from the humid Congo Basin to the arid Sahara Desert, where groundwater is influenced by climate variability, land use, and human activities.

Study Focus:

The main objective is to estimate groundwater recharge across Africa from 2003 to 2023 using a novel approach that uses GRACE-derived groundwater storage changes.

New Hydrological Insights for the Region:

This study provides new insights into the spatial patterns and temporal variability of groundwater recharge across Africa, highlighting the influence of climate variability on the continent’s groundwater resources. Key findings include distinct regional differences in recharge, with higher values in humid regions like the Congo Basin and lower values in arid regions like the Sahara Desert. Substantial interannual variability in recharge is largely driven by year-to-year variations in precipitation and modulated by major modes of climate variability, especially the Pacific Decadal Oscillation. The sensitivity of groundwater recharge to hydroclimatic extremes, with droughts causing significant declines and wet periods leading to above-average replenishment. Regions with low recharge rates or high variability, such as Northern Africa, are particularly vulnerable to climate change impacts and unsustainable groundwater abstraction. The findings emphasize the need for sustainable groundwater management strategies that consider the spatial and temporal variability of recharge, as well as the potential impacts of climate change on groundwater resources.

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利用 GRACE 得出的地下水储量变化估算 2003-2023 年期间整个非洲的地下水补给量
研究区域:非洲,从潮湿的刚果盆地到干旱的撒哈拉沙漠,气候区各不相同,地下水受到气候多变性、土地利用和人类活动的影响。研究重点:主要目的是使用一种新方法,利用 GRACE 衍生的地下水存储变化,估算 2003 年至 2023 年整个非洲的地下水补给量。对该地区水文的新认识:这项研究提供了对整个非洲地下水补给的空间模式和时间变化的新认识,突出了气候多变性对非洲大陆地下水资源的影响。主要发现包括:补给量存在明显的地区差异,刚果盆地等湿润地区的补给量较高,而撒哈拉沙漠等干旱地区的补给量较低。补给量的巨大年际变化在很大程度上受降水量年际变化的驱动,并受主要气候变异模式(尤其是太平洋十年涛动)的调节。地下水补给量对极端水文气候的敏感性,干旱会导致补给量大幅下降,而潮湿时期则会导致补给量高于平均水平。补给率低或变化大的地区,如北非,特别容易受到气候变化的影响和不可持续的地下水抽取。研究结果强调,可持续的地下水管理战略需要考虑补给的时空变化以及气候变化对地下水资源的潜在影响。
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来源期刊
Journal of Hydrology-Regional Studies
Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)
CiteScore
6.70
自引率
8.50%
发文量
284
审稿时长
60 days
期刊介绍: Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.
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