Title Permafrost thermal state in the polar Northern Hemisphere during the International Polar Year 2007-2009; a synthesis
Author Romanovsky, V.E.; Smith, S.L.; Christiansen, H.H.
Author Affil Romanovsky, V.E., University of Alaska-Fairbanks, Geophysical Institute, Fairbanks, AK. Other: Natural Resources Canada/Geological Survey of Canada, Canada; University Centre in Svalbard, Svalbard and Jan Mayen Islands
Source The International Polar Year, edited by A.G. Lewkowicz. Permafrost and Periglacial Processes, 21(2), p.106-116, . Publisher: Wiley, Oxford, United Kingdom. ISSN: 1045- 6740
Publication Date Jun. 2010
Notes In English. 40 refs. CRREL Acc. No: 65001978
Index Terms active layer; climatic change; permafrost; soils; soil temperature; subpolar regions; temperature; thawing; thermal regime; Eurasia; Greenland; North America; Northern Hemisphere; Arctic region; climate change; International Polar Year 2007-08; IPY 2007-08 Research Publications; monitoring; subarctic regions
Abstract The permafrost monitoring network in the polar regions of the Northern Hemisphere was enhanced during the International Polar Year (IPY), and new information on permafrost thermal state was collected for regions where there was little available. This augmented monitoring network is an important legacy of the IPY, as is the updated baseline of current permafrost conditions against which future changes may be measured. Within the Northern Hemisphere polar region, ground temperatures are currently being measured in about 575 boreholes in North America, the Nordic region and Russia. These show that in the discontinuous permafrost zone, permafrost temperatures fall within a narrow range, with the mean annual ground temperature (MAGT) at most sites being higher than -2C. A greater range in MAGT is present within the continuous permafrost zone, from above -1C at some locations to as low as -15C. The latest results indicate that the permafrost warming which started two to three decades ago has generally continued into the IPY period. Warming rates are much smaller for permafrost already at temperatures close to 0C compared with colder permafrost, especially for ice-rich permafrost where latent heat effects dominate the ground thermal regime. Colder permafrost sites are warming more rapidly. This improved knowledge about the permafrost thermal state and its dynamics is important for multidisciplinary polar research, but also for many of the 4 million people living in the Arctic. In particular, this knowledge is required for designing effective adaptation strategies for the local communities under warmer climatic conditions. Abstract Copyright (2010), Wiley Periodicals, Inc.
URL http://hdl.handle.net/10.1002/ppp.689
Publication Type journal article
Record ID 304404