DOI: 10.1002/jgrd.50576
论文题名: Representing and evaluating the landscape freeze/thaw properties and their impacts on soil impermeability: Hydrological processes in the community land model version 4
作者: Shi M. ; Yang Z.-L. ; Landerer F.W.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 14 起始页码: 7542
结束页码: 7557
语种: 英语
英文关键词: CLM4
; high-latitude regions
; hydrological cycles
; landscape frozen fraction
; snow cover fraction
; soil impermeability
Scopus关键词: Ice
; Runoff
; Snow
; CLM4
; High-latitude regions
; Hydrological cycles
; landscape frozen fraction
; Snow covers
; Soils
; bioaccumulation
; community structure
; freeze-thaw cycle
; ice
; landscape
; latitude
; numerical model
; runoff
; satellite imagery
; snow cover
; soil type
英文摘要: Snow cover at high latitudes is an excellent natural insulator that can maintain the underlying ground at a higher temperature than the overlying atmosphere. Soil impermeability usually varies when snow cover accumulates, which is closely related to soil and landscape freeze/thaw status. How snow cover affects the landscape frozen fraction and soil impermeability and how this impermeability regulates hydrological processes in cold regions have not been fully assessed and quantified. In order to understand these processes, this study performed a series of experiments by using the Community Land Model version 4 (CLM4). We first simulated the top-soil-layer ice, snow ice, and canopy ice to calculate the landscape frozen fraction, which was evaluated based on the Special Sensor Microwave/Imager (SSM/I) observed landscape freeze/thaw earth system data record (FT-ESDR) in two selected regions at high latitudes. Then two soil impermeability parameterizations were validated against various in situ and satellite observations. The results suggest the following: (1) compared to SSM/I FT-ESDR, CLM4 can capture the overall landscape freeze/thaw status in the regions north of 60°N in boreal winter and spring; (2) as the snow cover fraction approaches unity, the CLM4-simulated landscape frozen fraction is mainly controlled by the snow ice amount, resulting in step changes between SSM/I FT-ESDR observed and CLM4-simulated landscape frozen fractions; and (3) in most of the cold regions, the timing of the boreal spring runoff simulations is improved by reducing the impermeable area in high landscape frozen fraction regions. Key Points CLM4-based landscape frozen fraction is closely related to snow cover fraction Satellite observed landscape freeze/thaw status is used to evaluate the model Soil permeability modification improves the timing of the boreal spring runoff ©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/63507
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 Geological Sciences, John A. and Katherine G. Jackson School of Geosciences, University of Texas at Austin, 1 University Station C1100, Austin, TX 78712, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena CA, United States
Recommended Citation:
Shi M.,Yang Z.-L.,Landerer F.W.. Representing and evaluating the landscape freeze/thaw properties and their impacts on soil impermeability: Hydrological processes in the community land model version 4[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(14)