Change of Maximum Frozen Soil Depth in China and Its Primary Explanation

With the annual maximum frozen soil depth data of China, analysis is made of the special distribution and decadal change during the recent 50 years. The results show that the annual maximum frozen soil depth in China began to decrease since the 1980s, and decreased more distinctly during the 1990s. The decreasing of the maximum frozen soil depth is in accordance with the climate change (rising of minimum temperature and decreasing of the annual average daily temperature range). It indicates that the maximum frozen soil depth is sensitive to the climate change in China.