DOI: 10.1002/jgrd.50631
论文题名: Reconciling soil thermal and hydrological lower boundary conditions in land surface models
作者: Decharme B. ; Martin E. ; Faroux S.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 14 起始页码: 7819
结束页码: 7834
语种: 英语
英文关键词: land surface model
; soil hydrology
; soil temperature
Scopus关键词: Aquifers
; Boundary conditions
; Budget control
; Hydrology
; Rivers
; Soil moisture
; Temperature
; Temperature control
; Additional experiments
; In-situ observations
; Land surface modeling
; Land surface models
; Lower boundary conditions
; Soil hydrology
; Soil temperature
; Temperature profiles
; Surface measurement
; boundary condition
; climate modeling
; computer simulation
; energy budget
; hydrological change
; land surface
; numerical model
; resolution
; river discharge
; soil temperature
; soil water
; temperature effect
; water budget
英文摘要: The lower boundary condition of soil in land surface models is a key parameter, which can affect the energy and water budget at the surface/atmosphere interface. Indeed, it affects the thermal inertia of the ground as well as the water fluxes from the subsurface to the river-aquifer system. In land surface models, it is well known that the soil must be sufficiently deep to compute a realistic soil temperature profile, while in terms of hydrology, the soil column should be substantially thinner in order to simulate realistic river discharges and therefore surface fluxes. In addition to the confirmation of this paradox, the goal of this study is to show how it is solved in the Interaction between Soil Biosphere Atmosphere (ISBA) land surface model. To reconcile hydrological and thermal lower boundary conditions, a simple approach is developed in which the soil temperature profile is extended below the hydrological column of the soil, and the water profile is extrapolated at each thermal node as the depth increases. ISBA is applied across France over 20 years and at a relatively high resolution. Additional experiments are also performed using the same lower boundary conditions of 1, 2, 3, 5, and 12 m for hydrological and thermal equations. The simulated river discharges and temperature profiles are compared to a dense network of in situ observations. The results confirm the paradox addressed previously and demonstrate that, if left unsolved, it could lead to poor simulation of the soil water and energy budgets, potentially affecting the performance of forecast studies, hydrological applications, and/or climate modeling. Key Points The lower boundary condition of soil in land surface model Important parameter for soil temperature and hydrology Evaluation over a dense network of soil temperatures and river discharges ©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/63513
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: GAME-CNRM, CNRS, Météo-France, 42 Av. G. Coriolis, FR-31057 Toulouse, France
Recommended Citation:
Decharme B.,Martin E.,Faroux S.. Reconciling soil thermal and hydrological lower boundary conditions in land surface models[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(14)