高原地表过程中冻融过程在东亚夏季风中的作用

The Effect of the Frozen-Thaw Process in Tibetan Plateau on Summer Monsoon over Eastern Asia

用茶卡站冻结日数与季风指数的相关简单说明高原冻融过程与东亚夏季风之间存在联系。作为个例,对沱沱河区域1998,1999年从冬到夏过渡季节的冻融过程与感、潜热变化及东亚夏季风建立之间的关系进行了初步分析。结果表明:从冬到夏的过渡季节中,青藏高原的冻融过程与高原加热存在着联系,土壤季节性冻融使得高原地表向大气的感、潜热输送随季节发生变化,青藏高原的加热作用对东亚夏季风的爆发时间和强度有重要影响。因此,高原地表过程中土壤冻融过程在东亚夏季风的爆发过程中扮演着重要角色。

The relationship between the frozen - thaw process in the Tibetan Plateau and the summer monsoon over eastern Asia was investigated according to the correlation between the frozen days of soil and the summer monsoon index. As a ease, the correlation between the seasonal frozen - thaw process and the change of sensible heat and latent heat in Tuotuohe region, and eastern Asia summer monsoon onset was analyzed primarily. The results show that there is certain correlation between the frozen - thaw process and heating effect over the Tibetan Plateau in transitional season from winter to summer; the seasonal frozen - thaw of soil results in the transportation of sensible heat and latent heat from surface to atmosphere change with seasons; and heating effect over the Tibetan Plateau has a great influence on the time and intensity of the summer monsoon onset in eastern Asia. Therefore, the frozen - thaw process of soil plays an important role in Asian summer monsoon onset.