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《Journal of Glaciology and Geocryology》 2005-04
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Cold Regions in China

CHEN Ren-sheng, KANG Er-si, WU Li-zong, YANG Jian-ping,JI Xi-bin, ZHANG Zhi-hui(Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou Gansu 730000, China)  
The word 'Cold Regions' has been used widely. However, there is no standard definition for it. The cold regions in China should include all the permafrost areas, all the glacier areas, and by far the majority of stable seasonal snow cover. The vegetation types and climate types in cold regions should be different from those in other regions. Air temperature is the major factor to judge whether a region belongs to 'Cold Regions' or not, according to the literal meaning of 'Cold Regions'. The averaged monthly air temperature data, which were calculated from 4-time daily data, at the 571 stations in China, from 1961 to 1998, were used. The spatial resolution was of 1 km1 km, and the coordinate was Alberts projection. The averaged monthly air temperatures in every 1 km1 km area were calculated by using regression equation, in which altitude, %Y% axis and %X% axis in Alberts projection are used as input and %R%+2 was 0.92~0.97. The results showed that the Woo's definition and Yang's definition for 'Cold Regions' were not appropriate in China. A new definition of 'Cold Regions' in China should be that, the averaged air temperature in the coldest month was less than -3.0 , the number of month in which the averaged air temperature was higher than 10 was not more than 5, and the averaged yearly temperature was not more than 5.0 . The boundary and distribution of the new partition were accordant to those of permafrost, glaciers, snow cover, vegetation distribution and climate regionalization. The final area of 'Cold Regions' in China was about 417.410+4 km+2, which was 43.5% of the land area in China.
【Fund】: 国家自然科学基金项目(4040101240301010);; 中国科学院知识创新工程重要方向性项目(KZCX3-SW-329);; 中国科学院寒区旱区环境与工程研究所知识创新工程项目(20041122003113)资助
【CateGory Index】: P942
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