摘要
Permafrost in China includes high latitude permafrost in northeastern China, alpine permafrost in northwestern China and high plateau permafrost on the Tibetan Plateau. The high altitude permafrost is about 92% of the total permafrost area in China. The south boundary or lower limit of the seasonally frozen ground is defined in accordance with the 0 ℃ isothermal line of mean air temperature in January, which is roughly corresponding to the line extending from the Qinling Mountains to the Huaihe River in the east and to the southeast boundary of the Tibetan Plateau in the west. Seasonal frozen ground occurs in large parts of the territory in northern China, including Northeast, North, Northwest China and the Tibetan Plateau except for permafrost regions, and accounting for about 55% of the land area of China. The southern limit of short-term frozen ground generally swings south and north along the 25° northern latitude line, occurring in the wet and warm subtropic monsoon climatic zone. Its area is less than 20% of the land area of China.
Permafrost in China includes high latitude permafrost in northeastern China,alpine permafrost in northwestern China and high plateau permafrost on the Tibetan Plateau. The highaltitude permafrost is about 92% of the total permafrost area in China. The south boundary or lowerlimit of the seasonally frozen ground is defined in accordance with the 0 ℃ isothermal line ofmean air temperature in January, which is roughly corresponding to the line extending from theQinling Mountains to the Huaihe River in the east and to the southeast boundary of the TibetanPlateau in the west. Seasonal frozen ground occurs in large parts of the territory in northernChina, including Northeast, North, Northwest China and the Tibetan Plateau except for permafrostregions, and accounting for about 55% of the land area of China. The southern limit of short-termfrozen ground generally swings south and north along the 25° northern latitude line, occurring inthe wet and warm subtropic monsoon climatic zone. Its area is less than 20% of the land area ofChina.
基金
中国科学院知识创新工程项目，国家自然科学基金
