This data set includes digital versions of "The Map of Geocryological Regionalization and Classification in China" from Geocryology in China by Y. Zhou, D. Guo, G. Qiu, G. Cheng, and S. Li. Included are ESRI Shape files of meteorological stations, permafrost regions, and permafrost classifications and binary arrays of 25 km EASE-Gridded permafrost regions and classifications.
The maps delineate three major geographic areas divided into regions and subregions based on geographic and climatic conditions affecting the formation and spatial variability of permafrost and frozen ground. The maps also illustrate eight land classifications based on permafrost coverage and seasonal frozen ground depth. Station data include some information on air temperature, active layer depth, and seasonal frozen ground depth.
Data are available via ftp.
Qiu, G., Y. Zhou, D. Guo, and Y. Wang. 2002. Maps of geocryological regions and classifications. Digitized by T. Zhang. Boulder, CO: National Snow and Ice Data Center. Digital media.
|data format||ESRI Shape files and flat binary 721x721 arrays|
|spatial coverage and resolution||China. Digitized from 1:10,000,000 paper source map|
|grid type and size||Northern Hemisphere 25 km EASE-Grid (NL-EASE Grid) ESRI Shapefiles are vector files in Geographic (lat/lon) projection|
|file naming convention||ggd603_class_ease_china.bil
|file size||largest file = 816 KB uncompressed|
|parameter(s)||Geocryological regions, classification of frozen ground, maximum active layer depth, maximum seasonal frozen ground freeze depth, ratio of the range of annual temperature (A=TJul-TJan) to mean annual temperature (T)|
|procedures for obtaining data||data are available via ftp|
Tingjun Zhang, Research Associate, National Snow and Ice Data Center
NSIDC User Services
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
Boulder, CO 80309-0449 USA
phone: +1 303.492.6199
fax: +1 303.492.2468
form: Contact NSIDC User Services
Maps of meteorological stations, geocryological regions, classification of frozen ground, rivers, and lakes are in a vector format stored as ESRI Shapefiles. These are most easily imported into ESRI's ArcView, but most other GIS packages can import Shapefile data. ESRI also provides a free basic GIS package, ArcExplorer, on the ESRI web site.
Maps of geocryological regions and classification of frozen ground are also provided as grids in two flat binary files. The grids are in NSIDC's 25 km EASE-Grid format for the Northern Hemisphere in an Azimuthal Equal Area projection (the NL EASE-grid). Grids are arrays of 1-byte unsigned integers with 721 columns and 721 rows. Grid and projection parameters for the NL EASE-grid can be found in the table "Original 25km and 12.5km Grids" on NSIDC's All About EASE_Grid web site. Header (.hdr) and projection (.prj) files that where generated when original ESRI Shapefiles were converted to grids using ArcGIS are included for both grids. These extra files are required to view grids in ArcGIS, ArcView or ArcInfo.
Geocryological Land Classifications
I. Geocryological area of Eastern China
I.1 Permafrost region in temperate and cold, temperate zone of Northeastern China1. I.1-1 Sub region of predominantly continuous permafrost in the northern Da Hinggang Mountains
2. I.1-2 Sub-region of predominantly continuous and island permafrost in the Da Hinggang Mountains
3. I.1-3 Subregion of island and sparsely island permafrost in the Da Hinggang and Xiao Hinggang Mountains
I.2 Seasonally frozen ground region in the temperate and warm, temperate zone of Northeastern China4. I.2-1 Subregion of middle and thick seasonally frozen ground in the temperate zone of Northeastern China
5. I.2-2 Subregion in the warm temperate zone of Northeastern China
6. I.3 Region of short duration frozen ground in the subtropic zone of Southeastern China
7. I.4 Region of non-frozen ground in the subtropic zone of Southeastern China
II. Geocryological area of Northwestern China
8. II.1 Mountain permafrost region in the high, cold, temperate zone of Altay-Beita in Northwestern China.
9. II.2 Mountain permafrost region in the high, cold, temperate zone in the mountains west of the Junnggar Basin in Northwestern China.
10. II.3 Seasonally frozen ground region in the temperate zone of the Junnggar Basin in Northwestern China.
11. II.4 Mountain permafrost region in the high, cold mountain zone of Tian Shan in Northwestern China.
12. II.5 Seasonally frozen ground region in the warm, temperate zone of Tarim Basin in Northwestern China
13. II.6 Seasonally frozen ground region in the temperate zone of Hexi Corridor and the Alxa Plateau in Northwestern China
III. Geocryological area of Southwestern China (Qinghai-Xizang Plateau)
14. III.1 Mountain permafrost in the high, cold mountain zone of the Altun-Qilian Shan in Southwestern China
15. III.2 Seasonally frozen ground region in the temperate zone of Qaidam Basin in Southwestern China
16. III.3 Predominantly continuous permafrost region in the high, cold zone of the northern part of the Southern Qinghai and Northern Xizang Plateau in Southwestern China
17. III.4 Predominantly continuous and island permafrost in the high, cold zone of the southern part of the Northern Xizang Plateau.
18. III.5 Mountain permafrost region in the high, cold mountain zone of the Himalaya Shan in Southwestern China.
19. III.6 Island mountain permafrost region in the high, cold zone at the eastern fringe of the Qinghai-Xizang Plateau.
Meteorological Station Data
Meteorological station data includes station location and the ratio of annual termperature range (A=TJul-TJan) to mean annual temperature (T). Generally A/T < 0 in permafrost regions, A/T > 1 in seasonally frozen ground regions, and 0 < A/T > 1 in regions with no freeze/thaw cycle. addition to the temperature ratios, maximum seasonal thaw depth is provided for stations in permafrost areas and maximum seasonal freeze depth is provided for stations in seasonal frozen ground areas. The data are presented as (A/T)/(depth). Depth is not included for short-duration frozen ground and non-frozen ground areas.
The following figure was taken from Zhang (In Press) and was created from this data set.
Zhou, Y., D. Guo, G. Qiu, G. Cheng, and S. Li. 2000. "The Map of Geocryological Regionalization and Classification in China," in Geocryology in China, Beijing: Science Press. (in Chinese)
Zhang, T. 2001. "Book Review of Geocryology in China" in Permafrost and Periglacial Processes. 12: 315-322.
Zhang, T. In Press, "Historical overview of permafrost study in China." Physical Geography.
4 October 2002
7 October 2002
4 October 2002