文章基本信息

标题：An observation-based assessment of the influences of air temperature and snow depth on soil temperature in Russia
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作者：Hotaek Park ; Artem B Sherstiukov ; Alexander N Fedorov 等
期刊名称：Environmental Research Letters
印刷版ISSN：1748-9326
电子版ISSN：1748-9326
出版年度：2014
卷号：9
期号：6
页码：064026
DOI：10.1088/1748-9326/9/6/064026
语种：English
出版社：IOP Publishing Ltd
摘要：This study assessed trends in the variability of soil temperature (T_SOIL) using spatially averaged observation records from Russian meteorological land stations. The contributions of surface air temperature (SAT) and snow depth (SND) to T_SOIL variation were quantitatively evaluated. Composite time series of these data revealed positive trends during the period of 1921–2011, with accelerated increases since the 1970s. The T_SOIL warming rate over the entire period was faster than the SAT warming rate in both permafrost and non-permafrost regions, suggesting that SND contributes to T_SOIL warming. Statistical analysis revealed that the highest correlation between SND and T_SOIL was in eastern Siberia, which is underlain by permafrost. SND in this region accounted for 50% or more of the observed variation in T_SOIL. T_SOIL in the non-permafrost region of western Siberia was significantly correlated with changes in SAT. Thus, the main factors associated with T_SOIL variation differed between permafrost and non-permafrost regions. This finding underscores the importance of including SND data when assessing historical and future variations and trends of permafrost in the Northern Hemisphere.