These data are a digitization of the frozen soil distribution map of the Map of the Glaciers, Frozen Ground and Deserts in China (1:4,000,000). Considering the unification with the global frozen soil classification system, the permafrost is divided into the following five types:
(1) Discontinuous permafrost: continuous coefficient 50%-90%
(2) Island permafrost: continuous coefficient <50%
(3) Plateau discontinuous permafrost: continuous coefficient 50%-90%
(4) Plateau island permafrost: continuous coefficient 50%-90%
(5) Mountain permafrost
The compilation basis of the frozen soil map includes (1) the measured field survey data and exploration of frozen soil; (2) aerial image and satellite image interpretation; (3) TOPO30 1-km resolution ground elevation data; and (4) and temperature and ground temperature data. The distribution of frozen soil on the Tibetan Plateau adopted the research results of Zhuotong Nan et al. (2002). Using the average annual temperature data of 76 boreholes along the Qinghai-Tibet Highway, a statistical regression analysis was performed to obtain the relation between annual mean ground temperature, latitude and elevation. Based on the relation combined with GTOPO30 elevation data (global 1-km digital elevation model data developed by the Earth Resources Observation and Technology Center of the U.S Geological Survey), the annual average ground temperature distribution over the entire Tibetan Plateau was simulated. Taking the annual average ground temperature of 0.5 °C as the boundary between permafrost and seasonal frozen soil and the Map of Snow Ice and Frozen Ground in China (1:4,000,000) (Yafeng Shi, et al., 1988) as a reference, the boundary between the plateau discontinuous permafrost and plateau island permafrost was determined. In addition, taking the Distributions Map of Permafrost in Daxiao Hinganling Northeast China (Dongxin Guo, et al. 1981), the Distribution Map of Permafrost and Ground Ice in Circum-Arctic (Brown et al. 1997) and the latest field data as references, the permafrost boundary of northeast China has been revised; the mountain permafrost boundary in the northwest mostly adopted the boundary delineated in the Map of Snow Ice and Frozen Ground in China (1:4,000,000) (Yafeng Shi, et al., 1988).
According to this data set, permafrost area in China is approximately 1.75×106 km2, accounting for 18.25% of the territory of China, among which the mountain permafrost area is 0.29×106 km2, which accounts for 3.03% of the territory of China.
For more information, please refer to the Map of the Glaciers, Frozen Ground and Deserts in China (1:4,000,000) specification (Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, 2006).
|data size||1.9 MiB|
The compilation basis of frozen soil map includes: (1) frozen soil field survey, exploration and measurement data; (2) aerial photo and satellite image interpretation; (3) topo300 1km resolution ground elevation data; (4) temperature and ground temperature data.
The distribution of permafrost in the Qinghai Tibet Plateau is based on the research results of nanzhuo Tong et al. (2002). Using the measured annual average ground temperature data of 76 boreholes along the Qinghai Tibet highway, regression statistical analysis is carried out to obtain the relationship between the annual average ground temperature and latitude, elevation. Based on this relationship, combined with the gtopo30 elevation data (the global 1km developed under the leadership of the center for earth resources observation and science and technology, USGS) Digital elevation model (DEM) is used to simulate the annual mean ground temperature distribution over the whole Tibetan Plateau. Taking the annual average ground temperature of 0.5 ℃ as the boundary between permafrost and seasonal permafrost, the boundary between discontinuous Permafrost on the plateau and island Permafrost on the plateau is delimited by referring to the map of ice and snow permafrost in China (1:4 million) (Shi Yafeng et al., 1988); in addition, the division map of Permafrost on the big and small Xing'an Mountains in the Northeast (Guo Dongxin et al., 1981), the distribution map of permafrost and underground ice around the Arctic (b According to rown et al. 1997) and the latest field survey data, the Permafrost Boundary in Northeast China has been revised; the Permafrost Boundary in Northwest mountains mostly uses the boundary defined in the map of ice and snow permafrost in China (1:4 million) (Shi Yafeng et al., 1988).
The quality of data set is controlled by strict manual audit
|1||Distribution Map of Frozen Ground in China based on Map of Snow, Ice and Frozen Ground in China|
|2||1:4,000,000 Map of the Glaciers, Frozen Ground and Deserts in China|
|3||Distribution map of permafrost in China based on the map of permafrost and subsurface ice around the Arctic (Second Edition)|
|4||Permafrost Map of China and Its Neighbors Based Circum-Arctic Map of Permafrost and Ground Ice Conditions|
|5||Permafrost and permafrost zoning map of the Republic of Mongolia|
|6||Simulated distribution of permafrost in the upper reaches of Heihe River (1993-2012)|
|7||Daily Observational Data of Frozen Soil Temperature in Tangguladongkemadi Glacier Base Camp from 2005 to 2010|
|8||Active layer data of permafrost in Wuli, Qinghai Tibet Plateau, 1999-2006|
|9||Perennial permafrost activity data of the Two Dao Rivers on the Qinghai-Tibetan Plateau from 1999 to 2006|
|10||Multi-year permafrost active layer data of Sonam Dajie, Qinghai-Tibet Plateau, 1999-2006|
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