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《Journal of Glaciology and Geocryology》 1987-03
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First Discovery of Ice Wedges in Northeast China

Jia Mingchao and Yuan Fu (Laboratory of Geocryology. Yitulihe Railway Section) Cheng Guodong (Lanzhou Institute of Glaciology and Geocryology. Chinese Academy of Sciences)  
In 1983, ice wedges were firstly discovered in an excavation at Yitulihe (50?2'N, 121?9'E) in northeast China. The site where the ice wedges were found is located in discontinuous permafrost. The mean annual air temperature here is - 5 ℃, the annual precipitation is 694mm and the mean annual ground temperature is -1.2℃. Ice wedges were found in alluvium on the first terrace of the Yituli River. The ice wedges with milky white colour have the shapes of wedge and bar in excavated cross sections. The average top width of the ice wedges is about 1m with revealed heights about l.5m. The upper surface of the ice wedges is flat and coincides with the permafrost table, which is about 0.9min this site, except that the upper surface of one ice wedge is 0.5m lower than the permafrost table. These ice wedges may be in active ones. This is the first discovery of ice wedges in China. Up to now, these ice wedges are the southernmost ones discovered in the world.
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