DOI: 10.1029/2017JD028034
Scopus记录号: 2-s2.0-85052615721
论文题名: A Study of Soil Thermal and Hydraulic Properties and Parameterizations for CLM in the SRYR
作者: Chen J. ; Wen J. ; Tian H. ; Zhang T. ; Yang X. ; Jia D. ; Lai X.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 16 起始页码: 8487
结束页码: 8499
语种: 英语
英文关键词: CLM
; energy flux
; matric potential
; soil moisture
; soil temperature
; thermal/hydraulic conductivity
英文摘要: Located in the northeast part of the Qinghai-Tibet Plateau, the source region of the Yellow River is a crucial water conservation area. Laboratory tests and observations are used to determine the soil thermal and hydraulic properties in this key area. Furthermore, their physical processes in the Community Land Model (CLM) are revised to better apply to the plateau. The main results are as follows. (1) The thermal conductivity in frozen soil is mainly controlled by the content of air and is positively correlated with subzero temperatures (−5 to −20 °C); however, it slightly increases with increasing temperature (5 to 20 °C) in thawed soil, and obvious layering exists. The influence of temperature can be ignored for dry soil. (2) The thermal conductivity of thawed soil is positively correlated with water content and shows a nonlinear variation. The rate of increase is rapid during the early stage of thawing and then slows. (3) The saturated hydraulic conductivity decreases with depth. Soil matric potential exhibits large fluctuations and is spatially heterogeneous due to the feedback to soil moisture. (4) The simulation differences of soil temperature and moisture are narrowed to approximately 1 °C and by half, respectively, by the revised schemes in CLM4.5. The simulation of energy fluxes and ground temperature also improved, but the latent heat flux performed less well due to the deficiencies in the hydraulic schemes. This study is of great significance for research on land surface processes and the application of the CLM in the Qinghai-Tibet Plateau. ©2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113252
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory of Land Surface Processes and Climate Change, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China; State Key Laboratory of Cryosphere Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China; College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu, China
Recommended Citation:
Chen J.,Wen J.,Tian H.,et al. A Study of Soil Thermal and Hydraulic Properties and Parameterizations for CLM in the SRYR[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(16)