Current climate change effects on the ground thermal regime in Central Yakutia

摘要

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.