Title Thermal state of permafrost and active layer in Central Asia during the International Polar Year
Author Zhao Lin; Wu Qingbai; Marchenko, S.S.; Sharkhuu, N.
Author Affil Zhao Lin, Chinese Academy of Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, China. Other: University of Alaska-Fairbanks; Mongolian Academy of Sciences, Mongolia
Source The International Polar Year, edited by A.G. Lewkowicz. Permafrost and Periglacial Processes, 21(2), p.198-207, . Publisher: Wiley, Oxford, United Kingdom. ISSN: 1045- 6740
Publication Date Jun. 2010
Notes In English. 37 refs. CRREL Acc. No: 65001983
Index Terms active layer; boreholes; climatic change; permafrost; soils; soil temperature; temperature; thawing; thermal regime; Asia-- Central Asia; China; Mongolia; Asia--Tibetan Plateau; Asia--Tien Shan; Asia; Central Asia; climate change; Far East; International Polar Year 2007-08; IPY 2007-08 Research Publications; spatial distribution; Tibetan Plateau; Tien Shan
Abstract Permafrost in Central Asian is present in the Qinghai-Tibet Plateau in China, the Tien Shan Mountain regions in China, Kazakhstan and Kyrgyzstan, the Pamirs in Tajikistan, and in Mongolia. Monitoring of the ground thermal regime in these regions over the past several decades has shown that the permafrost has been undergoing significant changes caused by climate warming and increasing human activities. During the International Polar Year, measured mean annual ground temperature (MAGT) at a depth of 6 m ranged from -3.2C to 0.2C on the Qinghai-Tibet Plateau and the active-layer thickness (ALT) varied between 105 and 322 cm at different sites. Ground temperatures at the bottom of the active layer (TTOP) warmed on average by 0.06C yr-1 over the past decade. In Mongolia, MAGT at 10-15 m depth increased by up to 0.02-0.03C yr-1 in the Hovsgol Mountain region, but by 0.01-0.02C yr-1 in the Hangai and Hentei Mountain regions. The increase in permafrost temperatures in the northern Tien Shan from 1974 to 2009 ranged from 0.3C to 0.6C. At present measured permafrost temperatures vary from -0.5C to -0.1C. The ALT increased from 3.2 to 4 m in the 1970s to a maximum of 5.2 m between 1995 and 2009. Abstract Copyright (2010), Wiley Periodicals, Inc.
URL http://hdl.handle.net/10.1002/ppp.688
Publication Type journal article
Record ID 304399