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Abrupt increases in soil temperatures following increased precipitation in a permafrost region, central Lena River basin, Russia
Author(s) -
Iijima Yoshihiro,
Fedorov Alexander N.,
Park Hotaek,
Suzuki Kazuyoshi,
Yabuki Hironori,
Maximov Trofim C.,
Ohata Tetsuo
Publication year - 2009
Publication title -
permafrost and periglacial processes
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.867
H-Index - 76
eISSN - 1099-1530
pISSN - 1045-6740
DOI - 10.1002/ppp.662
Subject(s) - permafrost , snow , active layer , precipitation , water content , structural basin , environmental science , moisture , vegetation (pathology) , geology , snowmelt , hydrology (agriculture) , drainage basin , climatology , geomorphology , layer (electronics) , oceanography , geography , meteorology , medicine , chemistry , geotechnical engineering , cartography , organic chemistry , pathology , thin film transistor
Marked increases in active‐layer and upper permafrost temperatures occurred in the central Lena River basin in association with abrupt increases in active‐layer soil moisture following the summer of 2005. The positive trend in soil temperature‐moisture relations was observed at monitoring sites in the Yakutsk area, regardless of vegetation and soil type. The increase in soil temperature appears to have started in response to the large amounts of snow that accumulated in the winter of 2004. Abnormally high pre‐winter rainfall and snowfall in the following three years accelerated soil warming through the effects of greater latent heat of freezing and insulation from atmospheric cooling in winter. The consecutive positive anomalies of snow depth and rainfall, which occurred widely in the central and southern Lena River basin during this three‐year period, increased soil moisture and appear to have altered the active‐layer thermal properties, which likely induced widespread warming of the surface layer of permafrost in this region. Copyright © 2009 John Wiley & Sons, Ltd.