δ^(18)O and δD records of inactive ice wedge in Yitulihe, Northeastern China and their paleoclimatic implications  

作　　者：YANG SiZhong JIN HuiJun 

机构地区：[1]State Key Laboratory of Frozen Soils Engineering, Cold and Arid Region Environmental and Engineering Research Institute (CAREER1), Chinese Academy of Sciences, Lanzhou 730000, China

出　　处：《Science China Earth Sciences》2011年第1期119-126,共8页中国科学（地球科学英文版）

基　　金：supported by National Natural Science Foundation of China (Grant No. 40901044);Chinese Academy of Sciences (CAS) 100-Talent Program (Grant No. 2004407);Scholarships for Young Scientists of the State Key Laboratory of Frozen Soils Engineering (Grant No. SKLFSE-ZQ-04);Talent Fund of the Cold and Arid Regions Environmental and Engineering Research Institute, CAS (Grant No. O984971001)

摘　　要：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 paleo-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℃, 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°N, i.e., about 200 km.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 paleo-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°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°N, i.e., about 200 km.

关 键 词：inactive ice wedges stable isotopes HOLOCENE climate change 

分 类 号：P642.14[天文地球—工程地质学] P532[天文地球—地质矿产勘探]