Sensitivity of simulated frozen ground temperatures to different solar radiation and air temperature products—a case study in the Qilian Mountains in West China

Author:

Zhang Yanlin1ORCID,Li Xin2,Chang Xiaoli13,Jin Huijun34,Huang Anning5,Liang Ji1,Cheng Guodong246,Wang Xin1

Affiliation:

1. School of Earth Sciences and Spatial Information Engineering Hunan University of Science and Technology Xiangtan Hunnan Province China

2. CAS Centre for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing China

3. School of Civil Engineering, Institute of Cold‐Regions Engineering Science and Technology, and Northeast‐China Observatory and Research‐Station of Permafrost Geo‐Environment‐Ministry of Education Northeast Forestry University Harbin China

4. Da‐Xing'anling Observatory and Research Station of Permafrost Engineering and Environment and State Key Laboratory of Frozen Soils Engineering, Northwest Institute of Eco‐Environment and Resources Chinese Academy of Sciences Lanzhou China

5. CMA‐NJU Joint Laboratory for Climate Prediction Studies, State Key Laboratory of Severe Weather and Joint Center for Atmospheric Radar Research of CMA/NJU, School of Atmospheric Sciences Nanjing University Nanjing China

6. Institute of Urban Study Shanghai Normal University Shanghai China

Abstract

AbstractDownward solar radiation (DSR) and air temperature (Ta) have significant influences on the thermal state of frozen ground. These parameters are also important forcing terms for physically based land surface models (LSMs). However, the quantitative influences of inaccuracies in DSR and Ta products on simulated frozen ground temperatures remain unclear. In this study, three DSR products (CMFD‐SR, Tang‐SR, and GLDAS‐SR) and two Ta products (CMFD‐Ta and GLDAS‐Ta) were used to force an LSM model in an alpine watershed in Northwest China, to investigate the sensitivity of simulated ground temperatures to different DSR and Ta products. Compared to a control model (CTRL) forced by in situ observed DSR, ground temperatures simulated by the experimental model forced by GLDAS‐SR are obviously decreased because GLDAS‐SR is much lower than in situ observations. Instead, simulation results in models forced by CMFD‐SR and Tang‐SR are much closer to those of CTRL. Ta products led to significant errors in simulated ground temperatures. In conclusion, both CMFD‐SR and Tang‐SR could be used as good alternatives to in situ observed DSR for forcing a model, with acceptable errors in simulation results. However, more care need to be paid for models forced by Ta products instead of Ta observations, and conclusions should be carefully drawn.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

Earth-Surface Processes

Reference79 articles.

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