Effects of the Largest Lake of the Tibetan Plateau on the Regional Climate
Effects of the Largest Lake of the Tibetan Plateau on the Regional Climate
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DOI：
10.1029/2020jd033396
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发表时间：
2020-11
期刊：
影响因子：
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通讯作者：
D. Su;L. Wen;Xiaoqing Gao;M. Leppäranta;Xingyu Song;Qianqian Shi;G. Kirillin
中科院分区：
文献类型：
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作者：
D. Su;L. Wen;Xiaoqing Gao;M. Leppäranta;Xingyu Song;Qianqian Shi;G. Kirillin
青海湖是中国最大的湖泊。然而，其对当地气候的影响仍然知之甚少。通过一个大气-湖泊耦合模式，我们研究了湖泊对当地气候的影响。在调整了四个关键参数后，模型合理地再现了湖气相互作用。加上地形对湖陆风环流的影响，湖泊的存在增强了湖南部及其邻近陆地的降水，而湖北方沿着降水略有减少。湖泊对当地降水的影响显示出明显的季节和日变化，5月（-6.6%）和6月（-4.5%）降水量减少，7月（5.7%）至11月（125.6%）降水量增加。在无水季节，湖泊白天的冷却作用减弱，夜间的增暖作用加强，影响了湖泊降水的空间分布和强度。初夏，由于湖面白天降温，湖北部降水略有减少。反过来，湖泊引起的夜间变暖增加了湖泊南部及其邻近土地的降水。随着9月秋季降温的开始，来自湖泊的热量和水分通量导致整个湖泊白天和夜间降水增加。10月，背景大气环流加上强烈的湖泊效应导致少量但高比例的湖致降水均匀地分布在湖泊上。
Qinghai Lake is the largest lake in China. However, its influence on the local climate remains poorly understood. By using an atmosphere‐lake coupled model, we investigated the impact of the lake on the local climate. After the adjustment of four key parameters, the model reasonably reproduced the lake‐air interaction. Superimposed by the orographic effects on lake‐land breeze circulation, the presence of the lake enhanced precipitation over the southern part of the lake and its adjacent land, while slightly reduced precipitation along the northern shore of the lake. The lake effect on local precipitation revealed a distinct seasonal and diurnal variability, reducing precipitation in May (−6.6%) and June (−4.5%) and increasing it from July (5.7%) to November (125.6%). During the open water season, the lake's daytime cooling effect weakened and the nighttime warming effect strengthened, affecting spatial distribution and intensity of lake‐induced precipitation. In early summer, precipitation slightly decreased over the north part of the lake due to the lake's daytime cooling. In turn, lake‐induced nighttime warming increased precipitation over the southern section of the lake and its adjacent land. With the start of the autumn cooling in September, heat and moisture fluxes from the lake resulted in precipitation increase in both daytime and nighttime over the entire lake. In October, the background atmospheric circulation coupled with the strong lake effects lead to a small amount but high proportion of lake‐induced precipitation spreading evenly over the lake.