Linkages between GRACE water storage, hydrologic extremes, and climate teleconnections in major African aquifers
Linkages between GRACE water storage, hydrologic extremes, and climate teleconnections in major African aquifers
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非洲主要含水层 GRACE 储水量、极端水文和气候遥相关之间的联系
DOI：
10.1088/1748-9326/ac3bfc
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发表时间：
2022
影响因子：
6.7
通讯作者：
Scanlon B
中科院分区：
文献类型：
--
作者：
Scanlon B
水资源管理是非洲的一个关键问题，非洲许多地区连续遭受干旱和洪水。我们工作的目的是评估非洲主要含水层的水储存和相关控制（气候，人为干预）的时空变化，并考虑实现更可持续发展的方法。使用不同的方法来跟踪水储存，包括用于总水储存（TWS）的GRACE/GRACE后续卫星;用于水库储存的卫星测高、用于植被指数的MODIS卫星以及有限的地面监测。结果表明，下降趋势TWS（60-73 km 3以上的18年GRACE记录）仅限于含水层在北方非洲，控制主要由灌溉用水在努比亚和西北撒哈拉含水层。在西非的含水层（23-49立方公里）中发现了TWS上升的趋势，这是由于土地使用变化和农田扩张增加了补给。在非洲东部和南部，年际变率主导TWS变率，主要受极端气候控制。气候遥相关，特别是厄尔尼诺南方涛动和印度洋偶极子，强烈地控制了非洲东部和南部的干旱和洪水。北方非洲的含水层储存量巨大，这表明最近十年来储存量的下降不应影响该区域的含水层，但可能会影响当地的条件。由于当地地下水泛滥，需要对西非不断上升的地下水水位进行管理。在非洲东部和南部，可以通过储存从潮湿到干燥的气候周期中的水来实现更具气候适应力的水管理。非洲含水层提供的自然水储存是管理干旱和洪水之间变化的明显方式。
Water resources management is a critical issue in Africa where many regions are subjected to sequential droughts and floods. The objective of our work was to assess spatiotemporal variability in water storage and related controls (climate, human intervention) in major African aquifers and consider approaches toward more sustainable development. Different approaches were used to track water storage, including GRACE/GRACE Follow On satellites for Total Water Storage (TWS); satellite altimetry for reservoir storage, MODIS satellites for vegetation indices, and limited ground-based monitoring. Results show that declining trends in TWS (60–73 km3over the 18 yr GRACE record) were restricted to aquifers in northern Africa, controlled primarily by irrigation water use in the Nubian and NW Saharan aquifers. Rising TWS trends were found in aquifers in western Africa (23–49 km3), attributed to increased recharge from land use change and cropland expansion. Interannual variability dominated TWS variability in eastern and southern Africa, controlled primarily by climate extremes. Climate teleconnections, particularly El Nino Southern Oscillation and Indian Ocean Dipole, strongly controlled droughts and floods in eastern and southern Africa. Huge aquifer storage in northern Africa suggests that the recent decadal storage declines should not impact the regional aquifers but may affect local conditions. Increasing groundwater levels in western Africa will need to be managed because of locally rising groundwater flooding. More climate resilient water management can be accomplished in eastern and southern Africa by storing water from wet to dry climate cycles. Accessing the natural water storage provided by aquifers in Africa is the obvious way to manage the variability between droughts and floods.
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尼罗河三角洲中部地下水利用调查
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
D. E. Al;A. Closas;F. Molle
通讯作者：
F. Molle
影响因子：
1.9
作者：
M. Zeitoun
通讯作者：
M. Zeitoun
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影响因子：
2.9
作者：
Kilavi M
通讯作者：
Kilavi M
影响因子：
6.7
作者：
S. Jasechko;R. Taylor
通讯作者：
S. Jasechko;R. Taylor
根据 GRACE 时间序列重新评估全球蓄水趋势
影响因子：
6.7
作者：
B. Vishwakarma;P. Bates;N. Sneeuw;R. Westaway;J. Bamber
通讯作者：
J. Bamber