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Plateau Meteorology  2019, Vol. 38 Issue (5): 920-934    DOI: 10.7522/j.issn.1000-0534.2019.00026
    
Study on the Effects of Snow Cover on Heat Transport in Land Surface Processes over Qinghai-Tibetan Plateau
WANG Ting1, LI Zhaoguo2, Lü Shihua1,3, YAO Chuang1, MA Cuili1
1. Chengdu University of Information Technology, Chengdu 610225, Sichuan, China;
2. Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;
3. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, Jiangsu, China
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Abstract  Based on the long-term snow depth dataset of China (from 1979 to 2016), the distribution and variation characteristics of snow depth and snow days on the Qinghai-Tibetan Plateau (QTP) are analyzed. This study divides the snow cover period into three stages (accumulation, peak and melt). Combined with ERA-Interim monthly average reanalysis data, the relationships between snow cover and surface heat conditions (air, surface and soil temperature) and energy transport (surface net short-wave and net long-wave radiation, sensible and latent heat flux) in the TP are analyzed. The study preliminary discusses the role of snow in the QTP land surface process. The results show that:the snow (depth and days) on the QTP shows a decreasing trend during 1979-2016, but the trend in the Source Region of the Yellow River increases. The most significant decreasing trend appears in the peak snow stage (from January to February). The snow cover on the QTP plays a most important role on surface cooling, the response of deep soil temperature to the snow is hysteretic. The reduction of snow cover inhibits the upward heat transfer of soil, which is not conducive to the formation of frozen soil. The QTP snow cover shows a negative correlation with the sensible heat flux and also the surface heat flux. The negative correlation between snow cover and latent heat flux is weaker than that between snow cover and sensible heat flux. Due to the relatively large bias between QTP snows depth from ERA-Interim and the remote sensing data used in this study (including spatial distribution, climate tendency rate, inter-annual variability and absolute size, etc.), the snow cover shows a low relevant to the surface thermal condition and the surface heat flux. It is necessary to make a further discussion by the land surface model simulation.
Key words:  Qinghai-Tibetan Plateau      snow depth      snow days      land surface process      heat transport     
Received:  08 October 2018      Published:  17 October 2019
ZTFLH:  P461+.6  

Cite this article: 

WANG Ting, LI Zhaoguo, Lü Shihua, YAO Chuang, MA Cuili. Study on the Effects of Snow Cover on Heat Transport in Land Surface Processes over Qinghai-Tibetan Plateau. Plateau Meteorology, 2019, 38(5): 920-934.

URL: 

http://www.gyqx.ac.cn/EN/10.7522/j.issn.1000-0534.2019.00026     OR     http://www.gyqx.ac.cn/EN/Y2019/V38/I5/920

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