Estimating the water balance of a thermokarst lake in the middle of the Lena River basin, eastern Siberia

被引:86
作者
Fedorov, A. N. [1 ,5 ]
Gavriliev, P. P. [1 ]
Konstantinov, P. Y. [1 ]
Hiyama, T. [2 ]
Iijima, Y. [3 ]
Iwahana, G. [4 ]
机构
[1] Russian Acad Sci, Siberian Branch, Melnikov Permafrost Inst, Yakutsk, Sakha, Russia
[2] Res Inst Humanity & Nat, Kyoto, Japan
[3] Japan Agcy Marine Earth Sci & Technol, Res Inst Global Change, Yokosuka, Kanagawa 2370061, Japan
[4] Univ Alaska, Int Res Arctic Ctr, Fairbanks, AK 99701 USA
[5] North Eastern Fed Univ, Int Ctr Best, Yakutsk, Sakha, Russia
关键词
permafrost; thermokarst; ground ice; water balance; PERMAFROST; DRAINAGE; ALASKA;
D O I
10.1002/eco.1378
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Permafrost degradation and changes in water balance in a thermokarst lake in the middle part of the Lena River basin in eastern Siberia were investigated. We analysed the role of permafrost thawing in the water balance of a growing thermokarst lake. Long-term observations during the last two decades (1992-2008) at our thermokarst monitoring site, Yukechi, showed significant modifications of the landforms. Observations included ground temperature, thawing depth, soil moisture content in the active layer, surface subsidence rate, and ecological changes in the surrounding environment. We also used data obtained at the Yakutsk weather station to estimate the potential evaporation. During the observation period, the water surface area increased steadily from 195m(2) in 1993 to 3135m(2) in 2008, and the lake water increased from 337m(3) in 1993 to 3503m(3) in 2008. Water balance estimations showed that ground ice melt made up to one third of the total water input into the lake. The rapid development of growing thermokarst lakes indicates an ecological risk on the edges of cryogenic landscapes. Finally, we found that climate change and anthropogenic impacts have led to enhanced activity of cryogenic processes in the region. In particular, cultivated fields underlying ice-rich permafrost face enhanced degradation by cryogenic and hydrological processes because of recent climate change in the region. Copyright (c) 2013 John Wiley & Sons, Ltd.
引用
收藏
页码:188 / 196
页数:9
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