Temperature and heat flux changes at the base of Laurentide ice sheet inferred from geothermal data (evidence from province of Alberta, Canada)
| Autor: | Anastasia Gornostaeva, Dmitry Demezhko, Jan Šafanda, Jacek Majorowicz |
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| Rok vydání: | 2017 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Borehole Geophysics 010502 geochemistry & geophysics Thermal diffusivity 01 natural sciences Mineral resource classification Physics::Geophysics Heat flux Deglaciation General Earth and Planetary Sciences Astrophysics::Earth and Planetary Astrophysics Ice sheet Structural geology Geomorphology Geothermal gradient Geology 0105 earth and related environmental sciences |
| Zdroj: | International Journal of Earth Sciences. 107:113-121 |
| ISSN: | 1437-3262 1437-3254 |
| DOI: | 10.1007/s00531-017-1464-y |
| Popis: | Using a previously published temperature log of the 2363-m-deep borehole Hunt well (Alberta, Canada) and the results of its previous interpretation, the new reconstructions of ground surface temperature and surface heat flux histories for the last 30 ka have been obtained. Two ways to adjust the timescale of geothermal reconstructions are discussed, namely the traditional method based on the a priori data on thermal diffusivity value, and the alternative one including the orbital tuning of the surface heat flux and the Earth’s insolation changes. It is shown that the second approach provides better agreement between geothermal reconstructions and proxy evidences of deglaciation chronology in the studied region. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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