Detection and quantification of local anthropogenic and regional climatic transient signals in temperature logs from Czechia and Slovenia
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The paper reports on detection and quantification of the impact of local anthropogenic structures and regional climatic changes on subsurface temperature field. The analyzed temperature records were obtained by temperature monitoring in a borehole in Prague-Spořilov (Czechia) and by repeated logging of a borehole in Šempeter (Slovenia). The observed data were compared with temperatures yielded by mathematical 3D time-variable geothermal models of the boreholes’ sites with the aim to decompose the observed transient component of the subsurface temperature into the part affected by construction of new buildings and other anthropogenic structures in surroundings of the boreholes and into the part affected by the ground surface temperature warming due to the surface air temperature rise. A direct human impact on the subsurface temperature warming was proved and contributions of individual anthropogenic structures to this change were evaluated. In the case of Spořilov, where the mean annual warming rate reached 0.034°C per year at the depth of 38.3 m during the period 1993–2008, it turned out that about half of the observed warming can be attributed to the air (ground) surface temperature change and half to the human activity on the surface in the immediate vicinity of the borehole. The situation is similar in Šempeter, where the effect of the recently built surface anthropogenic structures is detectable down to the depth of 80 m and the share of the anthropogenic signal on the non-stationary component of the observed subsurface temperature amounts to 30% at the depth of 50 m.
KeywordsAsphalt Subsurface Temperature Ground Surface Temperature Transient Component Asphalt Surface
This study was supported by the Czech Science Foundation (projects TOP/08/E014 and P210/11/0183) and also by institutional research programs Z3012916 and K3046108.
- Beltrami H (2002) Climate from borehole data: energy fluxes and temperatures since 1500. Geophys Res Lett 29(23)Google Scholar
- Dědeček P, Šafanda J, Čermák V, Krešl M (2010) Air—ground temperature coupling—results of the seven year temperature monitoring under different types of surface. Geophys Res Abstracts Vol. 12, EGU2010-11852, 2010 EGU General AssemblyGoogle Scholar
- Ferguson G, Woodbury A (2004) Subsurface heat flow in an urban environment. J Geophys Res—Solid Earth 109(B2)Google Scholar
- Ferguson G, Woodbury A (2007) Urban heat islands in the subsurface. Geophys Res Lett 34(23)Google Scholar
- Harris RN, Chapman DS (1997) Borehole temperatures and a baseline for 20th-century global warming estimates. Science 275(5306)Google Scholar
- Lewis TJ, Wang K (1992) Influence of terrain on bedrock temperatures, Paleogr., Paleoclim.,Paleoecol. (Global and Planetary Change) 98:87–100Google Scholar
- Mesečni bilten (Monthly Bulletin) Arso environmental agency of the republic of Slovenia (ARSO), Ministry for Environment and Spatial Planning, 2009, XVI(12), 31–45. Available: http://www.arso.gov.si/oagenciji/knjižnica/mesečni bilten/
- Nitoiu D, Beltrami H (2005) Subsurface thermal effects of land use changes. J Geophys Res—Earth Surface 110(F1)Google Scholar
- Smerdon JE, Stieglitz M (2006) Simulating heat transport of harmonic temperature signals in the earth’s shallow subsurface: lower-boundary sensitivities. Geophys Res Lett 13(4)Google Scholar
- Šafanda J, Szewczyk J, Majorowicz J (2004) Geothermal evidence of very low glacial temperatures on a rim of the Fennoscandian ice sheet. Geophys Res Lett 31(7)Google Scholar