Correlation of Winter Fresh Snow Extent over Northern Eurasia and Summer Climate Anomalies in China

Apr. 13,2016
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As an important impact factor of climate anomalies in East Asia, snow cover and its relationship with climate anomalies in China have received much concern. However most of studies focus on snow cover on the Qinghai-Tibet plateau and its relationship with anomalies of summer precipitation in China. In recent years, as the satellite data of snow cover is released, the relationship between snow cover in Eurasia and summer precipitation in China has also become a research hot spot gradually.

Supported by National Fundamental Research Program of China (973 Program) and National Natural Science Foundation of China, MU Songning, senior engineer from Information Science Center and State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics in Institute of Atmospheric Physics of Chinese Academy of Sciences, based on the previous studies (Mu and Zhou, 2012), investigates the linkage mechanism between northern Eurasian winter total fresh snow extent and subsequent summer climate anomalies in China in depth, with the primary purpose of finding the key region of fresh snow extent over northern Eurasia.

Through EOF(Empirical orthogonal function) analysis, it is found that compared with northern Eurasian winter total fresh snow extent, Eurasian mid-latitude winter total fresh snow extent has more significant correlation with summer climate anomalies in China, which is similar to northern Eurasian winter total fresh snow extent. This correlation is very steady. After late 1980s, the correlation between Eurasian mid-latitude winter total fresh snow extent and the summer rainfall in the south of Yangtze River and Huaihe River Basin increases.

Through the analysis on seasonal evolution of the relations between winter fresh snow extents in different regions, different land surface elements and different atmospheric circulation, it can be concluded that: firstly, the seasonal evolvement rule of correlations between Eurasian mid-latitude winter total fresh snow extent and each land element of northern Eurasia as well as atmospheric circulation are coincident with each other, which is as well corresponding to the situation of Eurasian northern winter total fresh snow extent. Therein, the seasonal evolvement rule of correlation between Eurasian mid-latitude winter total fresh snow extent and land surface is clearer and more significant. Particularly, the seasonal evolvement rule of correlation with soil temperature is clearer than that of Eurasian northern winter total fresh snow extent. Therefore, it can be confirmed that Eurasian mid-latitude winter total fresh snow extent is able to replace Eurasian northern winter total fresh snow extent in terms of climate prediction significance.

Secondly, The European mid-latitude winter total fresh snow extent plays a key role in the “seasonal correlation” between Eurasian northern winter total fresh snow extent(Eurasian mid-latitude winter total fresh snow extent) and summer climate anomalies in China, because its variation maintains the physical way of “seasonal correlation”.

The research findings are published in Issue 5,2015, Chinese Journal of Atmospheric Sciences. The bilingual version has been launched already.

Corresponding Author: MU Songning
Email:
CNKI Press Officer: ZHONG Ming
Email: zm6946@cnki.net

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