Arid
DOI10.3390/rs10060904
Seasonal and Decadal Groundwater Changes in African Sedimentary Aquifers Estimated Using GRACE Products and LSMs
Bonsor, H. C.1; Shamsudduha, M.2,3; Marchant, B. P.4; MacDonald, A. M.1; Taylor, R. G.3
通讯作者Bonsor, H. C.
来源期刊REMOTE SENSING
ISSN2072-4292
出版年2018
卷号10期号:6
英文摘要

Increased groundwater abstraction is important to the economic development of Africa and to achieving many of the Sustainable Development Goals. However, there is little information on long-term or seasonal groundwater trends due to a lack of in situ monitoring. Here, we used GRACE data from three products (the Centre for Space Research land solution (CSR), the Jet Propulsion Laboratory’s Global Mascon solution (JPL-MSCN), and the Centre National D’etudes Spatiales / Groupe de Recherches de Geodesie Spatiale solution (GRGS)), to examine terrestrial water storage (TWS) changes in 12 African sedimentary aquifers, to examine relationships between TWS and rainfall , and estimate groundwater storage (GWS) changes using four Land Surface Models (LSMs) (Community Land Model (CLM2.0), the Variable Infiltration Capacity model (VIC), the Mosaic model (MOSAIC) and the Noah model (NOAH)). We find that there are no substantial continuous long-term decreasing trends in groundwater storage from 2002 to 2016 in any of the African basins, however, consistent rising groundwater trends amounting to similar to 1 km(3)/year and 1.5 km(3)/year are identified in the Iullemmeden and Senegal basins, respectively, and longer term variations in TWS in several basins associated with rainfall patterns. Discrete seasonal TWS responses of +/- 1-5 cm/year are indicated by GRACE for each of the basins, with the exception of the Congo, North Kalahari, and Senegal basins, which display larger seasonal TWS equivalent to approx. +/- 11-20 cm/year. The different seasonal responses in TWS provide useful information about groundwater, including the identification of 5 to 9 month accumulation periods of rainfall in many semi-arid and arid basins as well as differences in TWS responses between Sahelian and southern African aquifers to similar rainfall, likely reflecting differences in landcover. Seasonal GWS estimated by combining GRACE TWS with LSM outputs compare inconsistently to available in situ measurements of groundwater recharge from different basins, highlighting the need to further develop the representation of the recharge process in LSMs and the need for more in situ observations from piezometry.


英文关键词GRACE groundwater terrestrial water storage soil moisture recharge Africa
类型Article
语种英语
国家Scotland ; England
收录类别SCI-E
WOS记录号WOS:000436561800098
WOS关键词SUB-SAHARAN AFRICA ; LAND-SURFACE MODEL ; WATER STORAGE ; CLIMATE EXPERIMENT ; GRAVITY RECOVERY ; MASS-BALANCE ; DEPLETION ; RECHARGE ; BASIN ; AVAILABILITY
WOS类目Remote Sensing
WOS研究方向Remote Sensing
来源机构University of London
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/212629
作者单位1.British Geol Survey, Lyell Ctr, Res Ave South, Edinburgh EH14 4AP, Midlothian, Scotland;
2.UCL, Inst Risk & Disaster Reduct, Gower St, London WC1E 6BT, England;
3.UCL, Dept Geog, Gower St, London WC1E 6BT, England;
4.British Geol Survey, Ctr Environm Sci, Keyworth NG12 5GG, Notts, England
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GB/T 7714
Bonsor, H. C.,Shamsudduha, M.,Marchant, B. P.,et al. Seasonal and Decadal Groundwater Changes in African Sedimentary Aquifers Estimated Using GRACE Products and LSMs[J]. University of London,2018,10(6).
APA Bonsor, H. C.,Shamsudduha, M.,Marchant, B. P.,MacDonald, A. M.,&Taylor, R. G..(2018).Seasonal and Decadal Groundwater Changes in African Sedimentary Aquifers Estimated Using GRACE Products and LSMs.REMOTE SENSING,10(6).
MLA Bonsor, H. C.,et al."Seasonal and Decadal Groundwater Changes in African Sedimentary Aquifers Estimated Using GRACE Products and LSMs".REMOTE SENSING 10.6(2018).
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