DOI: 10.1002/jgrd.50335
论文题名: The role of groundwater in the Amazon water cycle: 3. Influence on terrestrial water storage computations and comparison with GRACE
作者: Pokhrel Y.N. ; Fan Y. ; Miguez-Macho G. ; Yeh P.J.-F. ; Han S.-C.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 8 起始页码: 3233
结束页码: 3244
语种: 英语
英文关键词: Amazon
; GRACE
; Groundwater
; Modeling
; Terrestrial Water Storage
Scopus关键词: Floods
; Models
; Rivers
; Soil moisture
; Amazon
; GRACE
; Hydrological models
; Hydrological simulations
; Infiltrated water
; Seasonal amplitudes
; Subsurface waters
; Terrestrial water storage
; Groundwater
; comparative study
; flooding
; GRACE
; groundwater-surface water interaction
; hydrological modeling
; subsurface flow
; water storage
; Amazonia
英文摘要: We explore the mechanisms whereby groundwater influences terrestrial water storage (TWS) in the Amazon using GRACE observations and two contrasting versions of the LEAF-Hydro-Flood hydrological model: one with and the other without an interactive groundwater. We find that, first, where the water table is shallow as in northwestern Amazonia and floodplains elsewhere, subsurface stores (vadose zone and groundwater) are nearly saturated year-round, hence river and flooding dominate TWS variation; where the water table is deep as in southeastern Amazonia, the large subsurface storage capacity holds the infiltrated water longer before releasing it to streams, hence the subsurface storage dominates TWS variation. Second, over the whole Amazon, the subsurface water contribution far exceeds surface water contribution to total TWS variations. Based on LEAF-Hydro-Flood simulations, 71% of TWS change is from subsurface water, 24% from flood water, and 5% from water in river channels. Third, the subsurface store includes two competing terms, soil water in the vadose zone and groundwater below the water table. As the water table rises, the length of vadose zone is shortened and hence the change in groundwater store is accompanied by an opposite change in soil water store resulting in their opposite phase and contributions to total TWS. We conclude that the inclusion of a prognostic groundwater store and its interactions with the vadose zone, rivers, and floodplains in hydrological simulations enhances seasonal amplitudes and delays seasonal peaks of TWS anomaly, leading to an improved agreement with GRACE observations. ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63814
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Earth and Planetary Sciences, Rutgers University, New Brunswick, NJ 08854, United States; Non-Linear Physics Group, Faculty of Physics, Universidade de Santiago de Compostela, Galicia, Spain; International Centre for Water Hazard and Risk Management (ICHARM), UNESCO, Tsukuba, Japan; Planetary Geodynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt MD, United States
Recommended Citation:
Pokhrel Y.N.,Fan Y.,Miguez-Macho G.,et al. The role of groundwater in the Amazon water cycle: 3. Influence on terrestrial water storage computations and comparison with GRACE[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(8)