caa a22 4500 477047688 CHVBK 20180405111334.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF00876434 doi (NATIONALLICENCE)springer-10.1007/BF00876434 Majorowicz Jacek Northern Geothermal Consult., 105 Carlson Close, T6R 2J8, Edmonton, Alberta, Canada aut Accelerating ground warming in the Canadian Prairie provinces: Is it a result of global warming? [Elektronische Daten] [Jacek Majorowicz] The results of precision temperature logs made to depths of several hundred meters in some 80 wells in Western Canada, most of which are located in the Prairie Provinces, show evidence of warming at the ground surface in the 0.5 K to 3.5 K range (average=2.2±0.7 K, for 80 unevenly distributed sites). Modeling shows that this warming mostly pertains to this century and it has been most substantal in the last four decades if the "ramp” function of the linear increase of surface temperature is assumed. Using the "step function” model's increase of surface temperature (land clearing, forest fires, etc.) the calculated onset of warming would pertain mostly to the last two decades. Contour maps of ground temperatures currently and previously and a contour map of the ground warming magnitude dilineate a large regional character of the ground temperature change at the southern marigin of permafrost for the large area of the Prairie Provinces. In many cases however, the magnitude of ground warming is much larger than the magnitude of air warming. This is especially evident for the northern areas of Alberta in the boreal forest ecoprovince. The magnitude of ground warming is equal to the magnitude of surface air warming in southern Alberta in the grassland and aspen parkland ecoprovinces. The analysis of the temperature depth response to the surface warming from well data shows the integrated effect of surface air warming together with the increases in ground temperature due to natural terrain effects and other anthropogenical changes to the surface of the earth. Birkhäuser Verlag, 1996 Climate change nationallicence ground warming nationallicence permafrost nationallicence heat flow nationallicence pure and applied geophysics Birkhäuser-Verlag 147/1(1996-06-01), 1-24 0033-4553 147:1<1 1996 147 24 https://doi.org/10.1007/BF00876434 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00876434 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Majorowicz Jacek Northern Geothermal Consult., 105 Carlson Close, T6R 2J8, Edmonton, Alberta, Canada aut NATIONALLICENCE 773 0- pure and applied geophysics Birkhäuser-Verlag 147/1(1996-06-01), 1-24 0033-4553 147:1<1 1996 147 24 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer