Object's details: Permafrost at the Ice Base of Recent Pleistocene Glaciations–Inferences from Borehole Temperature Profiles

Provider:Akademicka Platforma Czasopism

Description

Title:
Permafrost at the Ice Base of Recent Pleistocene Glaciations–Inferences from Borehole Temperature Profiles
Creator:
Majorowicz, Jacek
Description:
Paleo-temperature reconstruction from precise depth (>2.0 km) well temperature logs can offer information on whether the bed of an ice sheet was frozen. Inversion or upward extrapolation of the >2-km-deep geothermal profile is the only method by which temperature evolution at the base of long-disappeared ice sheets such as the Laurentide and Fennoscandian in the northern part of the Northern Hemisphere in North America and Europe can be inferred. It is obvious from the results from well temperature profiles that there were spatial variations in temperature at the base of the ice sheets during glaciations. This comes as no surprise, since modern-day measurements of temperature profiles through the ice of existing glaciers show a similarly large variability. Present bedrock temperatures measured beneath the central part of the Yukon Rusty glacier are near 0°C to -2°C while Greenland ice sheet base temperatures are -8 and -13°C. In case of very low paleo-temperatures derived from the interpretation of temperature profiles in the areas presently outside the current extent of glacial ice it can be shown that low temperature conditions under glacial ice could facilitate the existence of moderate (some 100-200 m) to thick (0.5 km-1 km) permafrost conditions. It is speculated here that, in many cases, paleo-glacial cold base ice could have existed right on top of paleo-permafrost in sediments just below. Such ice-bonded permafrost may have been frozen to glacial ice above, forming pillars which fixed glacial ice to permafrost below, thus limiting ice movement in such places and resulting in the -extended persistence of permafrost.
Object availability:
free access
Date:
2012.12.28
Type:
info:eu-repo/semantics/article;
info:eu-repo/semantics/publishedVersion
Language:
English
Source:
Bulletin of Geography. Physical Geography Series; No. 5 (2012); 7–28;
Bulletin of Geography. Physical Geography Series; Nr 5 (2012); 7–28;
2300-8490;
2080-7686
Format:
application/pdf
Publisher:
Uniwersytet Mikołaja Kopernika w Toruniu
Relation: https://apcz.umk.pl/BOGPGS/article/view/v10250-012-0001-x/2195
Subject:
Paleoclimate at last glaciation;
permafrost under glacial;
paleopermafrost;
temperature profiles
Identifier: https://apcz.umk.pl/BOGPGS/article/view/v10250-012-0001-x
Data provider:
Akademicka Platforma Czasopism

Similar objects

Permafrost at the Ice Base of Recent Pleistocene Glaciations–Inferences from Borehole Temperature Profiles

Creator:Majorowicz, Jacek

Date:2012.12.28

Type:text

Review and discussion of modern concepts and its relation to the research in Poland

Creator:Dobiński, Wojciech

Date:2024.03.15

Type:other

Thermal lithosphere across the Trans-European Suture Zone in Poland

Creator:Majorowicz, Jacek A.

Date:2004

Type:other

Związki pola geotermicznego z uwegleniem w polskich basenach węglowych

Creator:Majorowicz, Jacek

Date:1978

Type:other

Application of DC resistivity soundings and geomorphological surveys in studies of modern Arctic glacier marginal zones, Petuniabukta, Spitsbergen

Creator:Gibas, Justyna | Rachlewicz, Grzegorz | Szczuciński, Witold

Date:2005.12.31 | 2005

Type:image

Geophysical properties of the crust and upper mantle of the ocean-continent transition in Svalbard area

Creator:Grad, Marek | Majorowicz, Jacek

Date:2020.03.30

Type:image

Shallow geothermal heat in Western Canada: climatic warming impact changes with time– depth

Creator:Majorowicz, Jacek | Šafanda, Jan

Date:2023.06.28

Type:text

Formy pierścieniowe w rejonie Wejherowa jako prawdopodobne pozostałości po-pingo i ich znaczenie dla paleogeografii późnego glacjału w północnej Polsce = Ring forms in the area of Wejherowo as likely remnants of pingos, and their significance for Late-Glacial paleogeography in Northern Poland

Creator:Błaszkiewicz, Mirosław | Danel, Weronika

Date:2019.12.31 | 2019

Type:other

Federacja Bibliotek Cyfrowych

Object's details: Permafrost at the Ice Base of Recent Pleistocene Glaciations–Inferences from Borehole Temperature Profiles

Description

Similar objects