Assessment of the impacts of climate variability on total water storage across Africa: implications for groundwater resources management
Assessment of the impacts of climate variability on total water storage across Africa: implications for groundwater resources management
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DOI：
10.1007/s10040-018-1864-5
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发表时间：
2018-10
影响因子：
2.8
通讯作者：
Tales Carvalho Resende;L. Longuevergne;J. Gurdak;M. Leblanc;G. Favreau;N. Ansems;J. Gun;C. Gaye;A. Aureli
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文献类型：
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作者：
Tales Carvalho Resende;L. Longuevergne;J. Gurdak;M. Leblanc;G. Favreau;N. Ansems;J. Gun;C. Gaye;A. Aureli
研究了非洲大陆九个大型含水层盆地的海洋指数时间序列所描绘的气候变异性与水和地下水总储存量变化之间的联系。重力恢复和气候实验(GRACE)任务的观测是一个了不起的工具，可以深入了解直接现场观测有限的地区的陆地水文学动态。为了评估年际和年代际气候变化对地下水资源的影响，本研究评估了气候的天气控制与(I)2002-2013年GRACE和(Ii)一个能够重建1982-2011年过去蓄水量变化的双变量气候驱动模型估算的总蓄水量之间的关系。然后将这些估计值与地下水水位的时间序列进行比较，以显示总蓄水量与地下水蓄水量的相关性程度。结果表明，与厄尔尼诺南方涛动(ENSO)相关的降水模式是地下水年际储量变化的主要驱动因素，而大西洋数十年振荡(AMO)在年代际变化中起着重要作用。ENSO和AMO的共同作用可能引发含水层补给和地下水储存方面的重大变化，特别是在萨赫勒地区。这些发现可以帮助决策者在国家和跨界两个层面上制定更有效的气候变化适应计划。
The links between climate variability, depicted by time series of oceanic indices, and changes in total water and groundwater storage are investigated across nine large aquifer basins of the African continent. The Gravity Recovery and Climate Experiment (GRACE) mission’s observations represent a remarkable tool that can provide insight into the dynamics of terrestrial hydrology in areas where direct in situ observations are limited. In order to evaluate the impact of interannual and multidecadal climate variability on groundwater resources, this study assesses the relationship between synoptic controls on climate and total water storage estimates from (i) GRACE from 2002 to 2013 and (ii) a two-variable climate-driven model that is able to reconstruct past storage changes from 1982 to 2011. The estimates are then compared to time series of groundwater levels to show the extent to which total water storage covaries with groundwater storage. Results indicate that rainfall patterns associated with the El Niño Southern Oscillation (ENSO) are the main driver of changes in interannual groundwater storage, whereas the Atlantic MultiDecadal Oscillation (AMO) plays a significant role in decadal to multidecadal variability. The combined effect of ENSO and AMO could trigger significant changes in recharge to the aquifers and groundwater storage, in particular in the Sahel. These findings could help decision-makers prepare more effective climate-change adaptation plans at both national and transboundary levels.