globalchange  > 气候变化与战略
DOI: 10.5194/hess-23-2841-2019
论文题名:
Multi-decadal hydrologic change and variability in the Amazon River basin: Understanding terrestrial water storage variations and drought characteristics
作者: Chaudhari S.; Pokhrel Y.; Moran E.; Miguez-Macho G.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2019
卷: 23, 期:7
起始页码: 2841
结束页码: 2862
语种: 英语
Scopus关键词: Climate change ; Digital storage ; Geodetic satellites ; Groundwater ; Land use ; Surface waters ; Watersheds ; Drought characteristics ; Hydrologic alterations ; Hydrological changes ; Hydrological droughts ; Hydrological modeling ; Land use/ land covers ; Meteorological drought ; Terrestrial water storage ; Drought ; annual variation ; drought stress ; dry season ; GRACE ; hydrological change ; hydrological modeling ; satellite data ; water storage ; water stress ; Amazon Basin
英文摘要: We investigate the interannual and interdecadal hydrological changes in the Amazon River basin and its sub-basins during the 1980-2015 period using GRACE satellite data and a physically based, 2 km grid continental-scale hydrological model (LEAF-Hydro-Flood) that includes a prognostic groundwater scheme and accounts for the effects of land use-land cover (LULC) change. The analyses focus on the dominant mechanisms that modulate terrestrial water storage (TWS) variations and droughts. We find that (1) the model simulates the basin-averaged TWS variations remarkably well; however, disagreements are observed in spatial patterns of temporal trends, especially for the post-2008 period. (2) The 2010s is the driest period since 1980, characterized by a major shift in the decadal mean compared to the 2000s caused by increased drought frequency. (3) Long-term trends in TWS suggest that the Amazon overall is getting wetter (1.13 mm yr-1), but its southern and southeastern sub-basins are undergoing significant negative TWS changes, caused primarily by intensified LULC changes. (4) Increasing divergence between dry-season total water deficit and TWS release suggests a strengthening dry season, especially in the southern and southeastern sub-basins. (5) The sub-surface storage regulates the propagation of meteorological droughts into hydrological droughts by strongly modulating TWS release with respect to its storage preceding the drought condition. Our simulations provide crucial insight into the importance of sub-surface storage in alleviating surface water deficit across Amazon and open pathways for improving prediction and mitigation of extreme droughts under changing climate and increasing hydrologic alterations due to human activities (e.g., LULC change). © 2019 Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162943
Appears in Collections:气候变化与战略

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作者单位: Chaudhari, S., Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824, United States; Pokhrel, Y., Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824, United States; Moran, E., Department of Geography, Environment and Spatial Sciences, Michigan State University, East Lansing, MI 48824, United States; Miguez-Macho, G., Non-Linear Physics Group, Faculty of Physics, Universidade de Santiago de Compostela, Galicia, 15782, Spain

Recommended Citation:
Chaudhari S.,Pokhrel Y.,Moran E.,et al. Multi-decadal hydrologic change and variability in the Amazon River basin: Understanding terrestrial water storage variations and drought characteristics[J]. Hydrology and Earth System Sciences,2019-01-01,23(7)
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