DOI: 10.1002/2017JD027066
论文题名: Influence of landscape heterogeneity on water available to tropical forests in an Amazonian catchment and implications for modeling drought response
作者: Fang Y. ; Leung L.R. ; Duan Z. ; Wigmosta M.S. ; Maxwell R.M. ; Chambers J.Q. ; Tomasella J.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 16 起始页码: 8410
结束页码: 8426
语种: 英语
英文关键词: landscape heterogeneity
; lateral transport of soil moisture
; seasonal variability of groundwater dynamics and runoff
; transpiration
英文摘要: The Amazon basin has experienced periodic droughts in the past, and intense and frequent droughts are predicted in the future. Landscape heterogeneity could play an important role in how tropical forests respond to drought by influencing water available to plants. Using the one-dimensional ACME Land Model and the three-dimensional ParFlow variably saturated flow model, numerical experiments were performed for a catchment in central Amazon to elucidate processes that influence water available for plant use and provide insights for improving Earth system models. Results from ParFlow show that topography has a dominant influence on groundwater table and runoff through lateral flow. Without any representations of lateral processes, ALM simulates very different seasonal variations in groundwater table and runoff compared to ParFlow even if it is able to reproduce the long-term spatial average groundwater table of ParFlow through simple parameter calibration. In the ParFlow simulations, even in the plateau with much deeper water table depth during the dry season in the drought year of 2005, plant transpiration is not water stressed as the soil saturation is still sufficient for the stomata to be fully open based on the empirical wilting formulation in the models. This finding is insensitive to uncertainty in atmospheric forcing and soil parameters, but the empirical wilting formulation is an important factor that should be addressed using observations and modeling of coupled plant hydraulics-soil hydrology processes in future studies. The results could be applicable to other catchments in the Amazon basin with similar seasonal variability and hydrologic regimes. ©2017. American Geophysical Union. All Rights Reserved. 资助项目: DE-AC05-76RL01830
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62593
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: Earth Systems Science Division, Pacific Northwest National Laboratory, Richland, WA, United States; Atmospheric Science and Global Change Division, Pacific, Northwest National Laboratory, Richland, WA, United States; Department of Geology and Geological Engineering, Colorado School of Mines, Golden, CO, United States; Earth Sciences Division, Climate Sciences Department, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Centro Nacional de Monitoramento e Alerta de Desastres Naturais, São Paulo, Brazil
Recommended Citation:
Fang Y.,Leung L.R.,Duan Z.,et al. Influence of landscape heterogeneity on water available to tropical forests in an Amazonian catchment and implications for modeling drought response[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(16)