It is known that changes in ground surface temperatures could be caused by many non-climatic effects. In this study we propose a method based on utilization of Laplace equation with nonuniform boundary conditions. The proposed method makes possible to estimate the maximum effect of deep lakes and "heat islands" (areas of deforesta-5 tion, urbanization, farming, mining and wetland drainage) on the borehole temperature profiles. Majorowicz and Safanda, 2005; Hamza et al., 2007) . Earlier the

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... rd calculation approach (FCA) was used to the analysis and interpretation of borehole temperatures in terms of a GSTH (Eppelbaum et al., 2006). Three groups based on the geographical proximity were formed. Fifteen borehole temperature profiles from Europe (5), Asia (4) and North America (6) were selected (Huang and Pollack, 1998; 25 www.geo.lsa.umich.edu/ ∼ climate). The objective of this study was the estimation of the 416 CPD 4, 415-432, 2008 Abstract CPD 4, 415-432, 2008 Abstract 4, 415-432, 2008 Abstract 4, 415-432, 2008 Abstract Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Printer-friendly Version Interactive Discussion 20 Huang The solution of Eq. (2) is following (Balobayev and Shastkevich, 1974): 5 20 423 CPD 4, 415-432, 2008 Abstract Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Printer-friendly Version Interactive Discussion Eppelbaum, L. V., Kutasov, I. M., and Barak, G.: Ground surface temperatures histories inferred from 15 boreholes temperature profiles: comparison of two approaches, Earth Sci. Res. J., 425 CPD 4, 415-432, 2008