Evaluation of CLM5.0 for simulating surface energy budget and soil hydrothermal regime in permafrost regions of the Qinghai-Tibet Plateau

被引：8

作者：

Ma, Junjie ^{[1
,2
]}

Li, Ren ^{[1
]}

Liu, Hongchao ^{[3
]}

Huang, Zhongwei ^{[3
]}

Wu, Tonghua ^{[1
]}

Wu, Xiaodong ^{[1
]}

Zhao, Lin ^{[4
]}

Hu, Guojie ^{[1
]}

Xiao, Yao ^{[1
]}

Jiao, Yongliang ^{[1
,2
]}

Liu, Wenhao ^{[1
,2
]}

Wang, Shenning ^{[1
]}

Shi, Jianzong ^{[1
]}

Qiao, Yongping ^{[1
]}

机构：

[1] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Cryosphere Res Stn Qinghai Tibet Plateau, 320 Donggang West Rd, Lanzhou 730000, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Lanzhou Univ, Coll Atmospher Sci, Key Lab Semiarid Climate Change, Minist Educ, Lanzhou 730000, Peoples R China

[4] Nanjing Univ Informat Sci & Technol, Sch Geog Sci, Nanjing 210044, Peoples R China

来源：

AGRICULTURAL AND FOREST METEOROLOGY | 2023年 / 332卷

基金：

中国国家自然科学基金;

关键词：

Surface energy fluxes; Soil temperature and moisture; CLM; Thermal roughness length; Dry surface layer; COMMUNITY LAND MODEL; FREEZE-THAW PROCESSES; ACTIVE LAYER; HEAT FLUXES; SKIN TEMPERATURE; PARAMETERIZATION; ROUGHNESS; CLIMATE; BALANCE; IMPACT;

D O I：

10.1016/j.agrformet.2023.109380

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Surface energy budget and soil hydrothermal regime are crucial for understanding the interactions between the atmosphere and land surface. However, large uncertainties in current land surface process models exist, espe-cially for the permafrost regions in the Qinghai-Tibet Plateau. In this study, observed soil temperature, moisture, and surface energy fluxes at four sites in permafrost regions are chosen to evaluate the performance of CLM5.0. Furthermore, the soil property data, different thermal roughness length schemes, and dry surface layer (DSL) scheme are investigated. The results show that the soil property data is important for CLM5.0. The default scheme in CLM5.0 yields large errors for surface energy fluxes. The combination of the thermal roughness length and DSL scheme significantly improved the simulation of surface energy fluxes, especially for latent heat flux. The optimization of DSL scheme significantly improved soil temperature simulation and decreased the RMSE from 1.95 degrees C, 2.07 degrees C, 2.02 degrees C, and 2.95 degrees C to 1.34 degrees C, 1.35 degrees C, 1.35 degrees C and 2.29 degrees C in TGL site, respectively. The combination of the thermal roughness length and DSL scheme performed the best in shallow soil moisture, decreasing the RMSE from 0.136 m3 m- 3 to 0.049 m3 m- 3 in the XDT site but slightly enhancing the errors in middle soil. The interactions between surface energy and soil hydrothermal regime also discussed. However, the thermal roughness length and the DSL schemes are highly dependent on the condition of the underlying surface. Different schemes should be selected for different regions.

引用

页数：11

共 71 条

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Brutsaert W., 1982, Evaporation into the atmosphere: Theory, history and applications, DOI DOI 10.1007/978-94-017-1497-6

[2] Brief communication: Evaluation and inter-comparisons of Qinghai-Tibet Plateau permafrost maps based on a new inventory of field evidence [J].