Ground surface temperature reconstruction over the last 30,000 years from Onega parametric borehole temperature data
Category: 14-2
UDC 550.361:551.583
D.Yu. Demezhko(1), A.A. Gornostaeva(1), G.V. Tarkhanov(2), O.A. Esipko(2)
(1) Institute of Geophysics, UB RAS, Yekaterinburg, Russia
(2) JSC “SIC Nedra”, Yaroslavl, Russia
Abstract
Temperature log data from the Onega parametric borehole were analyzed. Temperature gradient variations observed to the depth of 2.5 km can be attributed to climate variations, rhythmic oscillations of thermophysical properties of volcano sedimentary rocks and thermal regime disturbances due to drilling. Considering these factors, a ground surface temperature history over the last 30,000 years was reconstructed. According to the reconstruction ground surface temperature 25,000 years ago was 18–20 °C lower than now. The increase of surface temperature began about 20 000 years ago and was originally associated with the warming influence of the Scandinavian ice sheet. After the ice sheet collapsed about 12,000 years ago the surface temperature follows the global warming of climate.
Keywords: geothermy, borehole temperatures, ground surface temperature reconstruction, paleoclimate, Onega parametric borehole, Valday (Weichselian) glaciation, Scandinavian ice sheet, Pleistocene, Holocene.
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