Current climate change effects on the ground
thermal regime in Central Yakutia |
| |
Authors: | Stepan Varlamov Yuri Skachkov and Pavel Skryabin |
| |
Institution: | Melnikov Permafrost Institute, Siberian Branch of the Russian Academy of Sciences, Yakutsk 677010, Russia;Melnikov Permafrost Institute, Siberian Branch of the Russian Academy of Sciences, Yakutsk 677010, Russia;Melnikov Permafrost Institute, Siberian Branch of the Russian Academy of Sciences, Yakutsk 677010, Russia |
| |
Abstract: | The evolution of ground thermal state has been studied to assess impacts of current climatic warming on permafrost in
Central Yakutia. The analysis of long-term data of regional weather stations has revealed one of the highest increasing
trends in mean annual air temperature in northern Russia. A forecast of surface air temperature fluctuations has been made by
applying a frequency analysis method. Monitoring of ground thermal conditions allows us to identify inter-annual and
long-term variability among a wide range of natural conditions. Experimental research has indicated a long-term dynamics of
ground thermal state evolution: ground temperatures at the depth of zero annual amplitude and seasonally thawed layer depth.
Long-term variability of thaw depth shows near-zero to weak positive trends in small valleys in contrast to weak negative
trends on slopes. With significant climatic warming, the thermal state of near-surface layers of permafrost demonstrates
steadiness. Anthropogenic impacts on ground thermal regime in various terrain types have been qualitatively evaluated.
Clear-cutting, ground cover stripping, and post-fire deforestation in inter-alas type terrains result in a significant increase of
temperature and seasonal ground thaw depth, as well as adverse cryogenic processes. The dynamics of mean annual ground
temperature in slash and burn sites have been evaluated in reference to stages of successive vegetation recovery. |
| |
Keywords: | permafrost active layer climate ground temperature regime natural landscapes disturbed landscapes |
本文献已被 CNKI 维普 等数据库收录! |
| 点击此处可从《寒旱区科学》浏览原始摘要信息 |
| 点击此处可从《寒旱区科学》下载免费的PDF全文 |
|