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Signature of the last ice age in the present subsurface temperatures in the Czech Republic and Slovenia
Šafanda, Jan ; Rajver, Dušan
Global surface temperature (GST) history can be evaluated by analysing the present-day temperature-depth profiles measured in boreholes. Due to the diffusive character of the process, however, the ...resolution of the method decreases quickly for the more remote events. The reconstructed GST at a givenmoment in the past is a weighted average of temperature over a certain period of time. The present study shows that because the cold climate of the last (Weichselian) glacial prevailed in the period of 75-10 ka, there is a chance to obtain its mean GST, despite the large averaging intervals, from temperature profiles measured in deep boreholes. This fact is demnstarted on the GST inversion of carefully selected profiles, three from the Czech Republic and two from Slovenia, the depth of which ranges between 1,5 and 2,4 km. They yield GST histories with a minimum between 19 and 10 ka followed by awarming of 6-15 K. In order to suppress the nonclimatic noise and to extract the common signal, the joint inversions were carried out for the Czech and theSlovenian boreholes, respectively. The Czech data show the minimum at 17 kaand the warming of 8 K. The Slovenian data have the minimum at 16 ka and the warming amounts to 7 K. These results agree well with information extracted earlier from the German KTB super deep borehole, where the inversionof the temperature log indicated 10 K warming since the glacial minimum, and represent an independent estimate of the difference between glacial and interglacial conditions typical for the region of Central Europe.
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