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Plateau Meteorology  2019, Vol. 38 Issue (5): 944-958    DOI: 10.7522/j.issn.1000-0534.2018.00125
    
Numerical Simulation of Seasonal Local Climate Effect in Qinghai Lake
SU Dongsheng1,2, WEN Lijuan1, ZHAO Lin1, LI Zhaoguo1, DU Juan1,2
1. 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;
2. University of Chinese Academy of Sciences, Beijing 100049, China
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Abstract  Due to the difference of the thermal properties between water and land, the lake has a significant impact on the local weather and climate, lakes on Qinghai-Tibetan Plateau account for more than half of China's total lake area, the effects of plateau lakes on regional weather and climate cannot be neglected, but studies on the local climate effect of the plateau lake are still insufficient. In this study, two simulation experiments that with and without lake were conducted by using the WRF-FLake dynamic coupling model to study the local climate effect of Qinghai Lake, the largest lake on TP, in a whole year. The results show that coupled model have a good performance on TP lake, Qinghai Lake reduce regional mean air temperature from January to June, while increase it from July to December. Moreover, daily maximum air temperature was decreased from January to September and daily minimum air temperature was increased from June to December, which also reduced the daily variation of air temperature. Qinghai lake have a cold lake effect in the daytime and turns to a warm lake effect in the nighttime. Qinghai lake slightly reduced the amount of precipitation in the lake area from February to June and significantly increased the regional precipitation from July to December, especially in August. The contribution rate of Qinghai lake to local annual precipitation is up to 50%~60% on the lake surface, and 10%~30% on the surrounding land. Qinghai lake increased the maximum amount of precipitation in summer, while has the largest contribution to total precipitation in autumn. The increased precipitation caused by Qinghai lake distribute most from 20:00 (Beijing Time, same below) to 02:00 of nighttime, while least from 14:00 to 20:00 of daytime. Most of them is convective precipitation in summer but not in autumn. During the daytime, the cold lake effect of Qinghai lake produces a sinking and divergent flow on the surface of the lake that inhibit the development of convection and the diffusion of water vapor, leading to a weaken of the lake effect precipitation, while the warm lake effect of Qinghai Lake in the night generate convergence and upward airflow on the lake surface, promote the development of convection and the diffusion of water vapor, strengthen the lake precipitation effect.
Key words:  Qinghai-Tibetan Plateau      Qinghai Lake      WRF-FLake      numerical simulation      lake effect     
Received:  29 August 2018      Published:  17 October 2019
ZTFLH:  P461+.5  

Cite this article: 

SU Dongsheng, WEN Lijuan, ZHAO Lin, LI Zhaoguo, DU Juan. Numerical Simulation of Seasonal Local Climate Effect in Qinghai Lake. Plateau Meteorology, 2019, 38(5): 944-958.

URL: 

http://www.gyqx.ac.cn/EN/10.7522/j.issn.1000-0534.2018.00125     OR     http://www.gyqx.ac.cn/EN/Y2019/V38/I5/944

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