欧亚春季雪盖异常对中国云贵高原5月降水的影响研究

The Effects of Eurasian Spring Snow Cover Anomaly on May Precipitation over Yunnan-Guizhou Plateau of China

摘要: 根据NOAA气候中心提供的雪盖数据和中国云贵高原初夏5月降水资料，应用奇异值分解方法研究了欧亚春季雪盖异常对中国云贵高原区初夏5月降水年际变化的影响。结果表明：影响云贵高原初夏5月降水的欧亚雪盖关键区分别位于喀拉海附近西西伯利亚区域的大陆(I区)、俄罗斯西南部至中亚地区(II区)、青藏高原东南角小部分区域(III区)。当I区~III区雪盖呈“+、−、+”的异常三极模分布时，云贵高原初夏5月降水偏多；反之，云贵高原初夏5月降水将偏少。

Abstract: According to the snow cover data provided by NOAA, and the precipitation over the Yunnan-Guizhou Plateau of China in May, we analyze the relationship between the precipitation over Yunnan-Guizhou Plateau of China in May and the snow cover of Eurasia in spring by using singular value decomposition (SVD). The results of statistical diagnosis show that there are three key areas that impact the precipitation over the Yunnan-Guizhou Plateau of China, located in western Siberia area mainland near Kara Sea (I area), the southwest of Russia to the central Asia (II area), the southeast area of Tibetan Plateau (III area). When the snow cover of I area to III area abnormal tri-pole mode as “−, +, −”, the precipitation over the low-latitude highlands of China increases in May. On the contrary, the precipitation over the low-latitude highlands of China decreases in May.