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Evolution of permafrost in China during the last 20 ka
Huijun JIN;  Xiaoying JIN;  Ruixia HE;  Dongliang LUO;  Xiaoli CHANG;  Shaoling WANG;  Sergey S MARCHENKO;  Sizhong YANG;  Chaolu YI;  Shijie LI;  Stuart A HARRIS
2019
Source PublicationScience China Earth Sciences
Volume62Issue:8Pages:1207-1223
Abstract

The formation and evolution of permafrost in China during the last 20 ka were reconstructed on the basis of large amount of paleo-permafrost remains and paleo-periglacial evidence, as well as paleo-glacial landforms, paleo-flora and paleofauna records. The results indicate that, during the local Last Glacial Maximum (LLGM) or local Last Permafrost Maximum (LLPMax), the extent of permafrost of China reached 5.3×106−5.4×106 km2, or thrice that of today, but permafrost shrank to only 0.80×106−0.85×106 km2, or 50% that of present, during the local Holocene Megathermal Period (LHMP), or the local Last Permafrost Minimum (LLPMin). On the basis of the dating of periglacial remains and their distributive features, the extent of permafrost in China was delineated for the two periods of LLGM (LLPMax) and LHMP (LLPMin), and the evolution of permafrost in China was divided into seven periods as follows: (1) LLGM in Late Pleistocene (ca. 20000 to 13000−10800 a BP) with extensive evidence for the presence of intensive ice-wedge expansion for outlining its LLPMax extent; (2) A period of dramatically changing climate during the early Holocene (10800 to 8500−7000 a BP) when permafrost remained relatively stable but with a general trend of shrinking areal extent; (3) The LHMP in the Mid-Holocene (8500−7000 to 4000−3000 a BP) when permafrost degraded intensively and extensively, and shrank to the LLPMin; (4) Neoglaciation during the late Holocene (4000−3000 to 1000 a BP, when permafrost again expanded; (5) Medieval Warming Period (MWP) in the late Holocene (1000−500 a BP) when permafrost was in a relative decline; (6) Little Ice Age (LIA) in the late Holocene (500−100 a BP), when permafrost relatively expanded, and; (7) Recent warming (during the 20th century), when permafrost continuously degraded and still is degrading. The paleo-climate, geography and paleopermafrost extents and other features were reconstructed for each of these seven periods.

KeywordPermafrost Evolution cryogenic Wedge Structures local Last Glacial Maximum (Llgm) local Holocene Megathermal Period (Lhmp) china
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10190
Collection月球与行星科学研究中心
Affiliation1.Northeast China Observational Station of Cold-regions Engineering and Environment, State Key Laboratory of Frozen Soils Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
2.School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
3.School of Resources and Environment, University of Chinese Academy of Science, Beijing 100049, China
4.Hunan University of Science and Technology, Xiangtan 411201, China
5.Permafrost Laboratory, Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
6.GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam D-14473, Germany
7.Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100010, China
8.Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
9.Department of Geography, University of Calgary, Calgary, Alberta T2N 1N4, Canada
Recommended Citation
GB/T 7714
Huijun JIN;Xiaoying JIN;Ruixia HE;Dongliang LUO;Xiaoli CHANG;Shaoling WANG;Sergey S MARCHENKO;Sizhong YANG;Chaolu YI;Shijie LI;Stuart A HARRIS. Evolution of permafrost in China during the last 20 ka[J]. Science China Earth Sciences,2019,62(8):1207-1223.
APA Huijun JIN;Xiaoying JIN;Ruixia HE;Dongliang LUO;Xiaoli CHANG;Shaoling WANG;Sergey S MARCHENKO;Sizhong YANG;Chaolu YI;Shijie LI;Stuart A HARRIS.(2019).Evolution of permafrost in China during the last 20 ka.Science China Earth Sciences,62(8),1207-1223.
MLA Huijun JIN;Xiaoying JIN;Ruixia HE;Dongliang LUO;Xiaoli CHANG;Shaoling WANG;Sergey S MARCHENKO;Sizhong YANG;Chaolu YI;Shijie LI;Stuart A HARRIS."Evolution of permafrost in China during the last 20 ka".Science China Earth Sciences 62.8(2019):1207-1223.
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