Journal
SCIENCE CHINA-EARTH SCIENCES
Volume 54, Issue 1, Pages 119-126Publisher
SCIENCE PRESS
DOI: 10.1007/s11430-010-4029-5
Keywords
inactive ice wedges; stable isotopes; Holocene; climate change
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Funding
- National Natural Science Foundation of China [40901044]
- Chinese Academy of Sciences (CAS) [2004407]
- State Key Laboratory of Frozen Soils Engineering [SKLFSE-ZQ-04]
- Talent Fund of the Cold and Arid Regions Environmental and Engineering Research institute, CAS [O984971001]
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Discovered in the late 1980s, inactive ice wedges in Yitulihe in the north part of Da Hinggan Mountains, Northeastern China are the southernmost in the Northern Hemisphere, and they are important palco-environmental indicators. Recently, research was carried out to analyze the hydrogen and oxygen isotopes of an inactive ice wedge from them. The plot of stable isotopes reveals three periods of temperature fluctuations centered approximately at 2.8, 2.3 and 1.9 ka BP. And the resultant temperature was probably lowered by about 2.1, 1.1, and 1.3 degrees C, respectively, in comparison with present temperatures. In conjunction with previous studies, pollen record and radiocarbon dating, the ice wedges probably developed between 3.3 to 1.6 ka BP, and the southern limit of the permafrost (SLP) at that time advanced southwards by around 2 degrees N, i.e., about 200 km.
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