Climate changes of the last millennium inferred from borehole temperatures: Results from the Czech Republic—Part I

Ground surface temperature histories were reconstructed from the temperature logs of eleven boreholes drilled in the Czech Republic. The study has identified several climate episodes during the past millennium, when the ground surface temperature oscillated with an amplitude of at least 2–3 K. Pronounced warming by up to 2 K characterized the beginning of the 20th century. The results seem to correlate well with climate reconstructions based on proxy data, and also with the long-term meteorological records. The paper represents the first part of a more extensive study aimed to propose a regional pattern of the past climate change derived from geothermal data in Central Europe.