| 来源类型 | Article
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| 规范类型 | 其他
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| DOI | 10.1002/hyp.10869
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| Impact of climate-indicators on continental-scale potential groundwater recharge in Africa. |
| Nasta P; Gates JB; Wada Y
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| 发表日期 | 2016
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| 出处 | Hydrological Processes 30 (19): 3420-3433
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| 出版年 | 2016
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| 语种 | 英语
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| 摘要 | In the last decades, human activity has been contributing to climate change that is closely associated with an increase in temperatures, increase in evaporation, intensification of extreme dry and wet rainfall events, and widespread melting of snow and ice. Understanding the intricate linkage between climate warming and the hydrological cycle is crucial for sustainable management of groundwater resources, especially in a vulnerable continent like Africa. This study investigates the relationship between climate-change drivers and potential groundwater recharge (PGR) patterns across Africa for a long-term record (1960–2010). Water-balance components were simulated by using the PCR-GLOBWB model and were reproduced in both gridded maps and latitudinal trends that vary in space with minima on the Tropics and maxima around the Equator. Statistical correlations between temperature, storm occurrences, drought, and PGR were examined in six climatic regions of Africa. Surprisingly, different effects of climate-change controls on PGR were detected as a function of latitude in the last three decades (1980–2010). Temporal trends observed in the Northern Hemisphere of Africa reveal that the increase in temperature is significantly correlated to the decline of PGR, especially in the Northern Equatorial Africa. The climate indicators considered in this study were unable to explain the alarming negative trend of PGR observed in the Sahelian region, even though the Standardized Precipitation-Evapotranspiration Index (SPEI) values report a 15% drought stress. On the other hand, increases in temperature have not been detected in the Southern Hemisphere of Africa, where increasing frequency of storm occurrences determine a rise of PGR, particularly in southern Africa. Time analysis highlights a strong seasonality effect while PGR is in-phase with rainfall patterns in the summer (Northern Hemisphere) and winter (Southern Hemisphere) and out-of-phase during the fall season. This study helps to elucidate the mechanism of the processes influencing groundwater resources in six climatic zones of Africa, even though modeling results need to be validated more extensively with direct measurements in future studies. This article is protected by copyright. All rights reserved. |
| 主题 | Water (WAT)
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| 关键词 | potential groundwater recharge
rainfall
drought
seasonality
storm frequency
Africa
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| URL | http://pure.iiasa.ac.at/id/eprint/13218/
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| 来源智库 | International Institute for Applied Systems Analysis (Austria)
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| 引用统计 |
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| 资源类型 | 智库出版物
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| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/130587
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推荐引用方式
GB/T 7714 |
Nasta P,Gates JB,Wada Y. Impact of climate-indicators on continental-scale potential groundwater recharge in Africa.. 2016.
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Impact%20of%20Climate-Indicators%20on%20Continental-Scale%20Potential%20Groundwater%20Recharge%20in%20Africa.pdf
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