DOI: 10.1175/JCLI-D-15-0307.1
Scopus记录号: 2-s2.0-84966327466
论文题名: Implementing and evaluating variable soil thickness in the Community Land Model, version 4.5 (CLM4.5)
作者: Brunke M.A. ; Broxton P. ; Pelletier J. ; Gochis D. ; Hazenberg P. ; Lawrence D.M. ; Leung L.R. ; Niu G.-Y. ; Troch P.A. ; Zeng X.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 9 起始页码: 3441
结束页码: 3461
语种: 英语
Scopus关键词: Climate models
; Heat flux
; Moisture
; Soil moisture
; Specific heat
; Surface measurement
; Temperature
; Thermal conductivity
; Vegetation
; Watersheds
; Community land models
; Land surface modeling
; Land surface models
; Mountainous terrain
; Spatial variations
; Unconsolidated sediment
; Vertical profile
; Weather and climate models
; Soils
; climate modeling
; heat capacity
; land surface
; soil depth
; soil moisture
; thermal conductivity
英文摘要: One of the recognized weaknesses of land surface models as used in weather and climate models is the assumption of constant soil thickness because of the lack of global estimates of bedrock depth. Using a 30-arc-s global dataset for the thickness of relatively porous, unconsolidated sediments over bedrock, spatial variation in soil thickness is included here in version 4.5 of the Community Land Model (CLM4.5). The number of soil layers for each grid cell is determined from the average soil depth for each 0.9° latitude × 1.25° longitude grid cell. The greatest changes in the simulation with variable soil thickness are to baseflow, with the annual minimum generally occurring earlier. Smaller changes are seen in latent heat flux and surface runoff primarily as a result of an increase in the annual cycle amplitude. These changes are related to soil moisture changes that are most substantial in locations with shallow bedrock. Total water storage (TWS) anomalies are not strongly affected over most river basins since most basins contain mostly deep soils, but TWS anomalies are substantially different for a river basin with more mountainous terrain. Additionally, the annual cycle in soil temperature is partially affected by including realistic soil thicknesses resulting from changes in the vertical profile of heat capacity and thermal conductivity. However, the largest changes to soil temperature are introduced by the soil moisture changes in the variable soil thickness simulation. This implementation of variable soil thickness represents a step forward in land surface model development. © 2016 American Meteorological Society. 资助项目: DOE, U.S. Department of Energy
; NASA, National Aeronautics and Space Administration
; NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49952
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric Sciences, The University of Arizona, Tucson, AZ, United States; Department of Geosciences, The University of Arizona, Tucson, AZ, United States; National Center for Atmospheric Research, Boulder, CO, United States; Pacific Northwest National Laboratory, Richland, WA, United States; Department of Hydrology and Water Resources, The University of Arizona, Tucson, AZ, United States
Recommended Citation:
Brunke M.A.,Broxton P.,Pelletier J.,et al. Implementing and evaluating variable soil thickness in the Community Land Model, version 4.5 (CLM4.5)[J]. Journal of Climate,2016-01-01,29(9)