Ground surface temperature history in central Canada inferred from 10 selected borehole temperature profiles
International audience Among the 57 temperature-depth profiles recently measured in Manitoba and Saskatchewan(C anada), only 10 are suitable for inferring recent changes in ground surface temperature. Many of the rejected temperature profiles show an apparent climatic signal but are affected by topo...
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ftbrgm:oai:HAL:hal-00790790v1 2024-06-23T07:53:40+00:00 Ground surface temperature history in central Canada inferred from 10 selected borehole temperature profiles Guillou-Frottier, Laurent Mareschal, Jean-Claude Musset, Julien Centre de recherche sur la dynamique du système Terre (GEOTOP) École Polytechnique de Montréal (EPM)-McGill University = Université McGill Montréal, Canada -Université de Montréal (UdeM)-Université du Québec en Abitibi-Témiscamingue (UQAT)-Université du Québec à Rimouski (UQAR)-Concordia University Montreal -Université du Québec à Montréal = University of Québec in Montréal (UQAM) 1998-04 https://brgm.hal.science/hal-00790790 https://doi.org/10.1029/98JB00021 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/98JB00021 hal-00790790 https://brgm.hal.science/hal-00790790 doi:10.1029/98JB00021 ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://brgm.hal.science/hal-00790790 Journal of Geophysical Research, 1998, 103 (B4), pp.7385-7397. ⟨10.1029/98JB00021⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 1998 ftbrgm https://doi.org/10.1029/98JB00021 2024-05-31T03:56:15Z International audience Among the 57 temperature-depth profiles recently measured in Manitoba and Saskatchewan(C anada), only 10 are suitable for inferring recent changes in ground surface temperature. Many of the rejected temperature profiles show an apparent climatic signal but are affected by topography, changes in vegetation, or the proximity of lakes. At the northernmost site, near Lynn Lake, Manitoba, shallow horizontal variations in temperature have been identified that are related to intermittent permafrost. Such variations can induce an apparent "climatic" perturbation. In areas where lateral thermal conductivity contrasts have been measured, heat refraction effects can also incorrectly be interpreted as ground surface temperature histories. The analysis suggests that forest fires that occurred at some of the sites have had little influence on the temperature profiles. The 10 selected temperature profiles cover a wide area in northern Manitoba and Saskatchewan. They have been independently and jointly inverted by a singular value decomposition method. The ground surface temperature history shows two main episodes. A cold period, tentatively identified as Little Ice Age, with a minimum around 1820 A.D., was followed by marked warming after 1920. These trends are similar to those recognized in eastern Canada. Article in Journal/Newspaper Ice permafrost BRGM: HAL (Bureau de Recherches Géologiques et Minières) Canada Journal of Geophysical Research: Solid Earth 103 B4 7385 7397 |
institution |
Open Polar |
collection |
BRGM: HAL (Bureau de Recherches Géologiques et Minières) |
op_collection_id |
ftbrgm |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Guillou-Frottier, Laurent Mareschal, Jean-Claude Musset, Julien Ground surface temperature history in central Canada inferred from 10 selected borehole temperature profiles |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Among the 57 temperature-depth profiles recently measured in Manitoba and Saskatchewan(C anada), only 10 are suitable for inferring recent changes in ground surface temperature. Many of the rejected temperature profiles show an apparent climatic signal but are affected by topography, changes in vegetation, or the proximity of lakes. At the northernmost site, near Lynn Lake, Manitoba, shallow horizontal variations in temperature have been identified that are related to intermittent permafrost. Such variations can induce an apparent "climatic" perturbation. In areas where lateral thermal conductivity contrasts have been measured, heat refraction effects can also incorrectly be interpreted as ground surface temperature histories. The analysis suggests that forest fires that occurred at some of the sites have had little influence on the temperature profiles. The 10 selected temperature profiles cover a wide area in northern Manitoba and Saskatchewan. They have been independently and jointly inverted by a singular value decomposition method. The ground surface temperature history shows two main episodes. A cold period, tentatively identified as Little Ice Age, with a minimum around 1820 A.D., was followed by marked warming after 1920. These trends are similar to those recognized in eastern Canada. |
author2 |
Centre de recherche sur la dynamique du système Terre (GEOTOP) École Polytechnique de Montréal (EPM)-McGill University = Université McGill Montréal, Canada -Université de Montréal (UdeM)-Université du Québec en Abitibi-Témiscamingue (UQAT)-Université du Québec à Rimouski (UQAR)-Concordia University Montreal -Université du Québec à Montréal = University of Québec in Montréal (UQAM) |
format |
Article in Journal/Newspaper |
author |
Guillou-Frottier, Laurent Mareschal, Jean-Claude Musset, Julien |
author_facet |
Guillou-Frottier, Laurent Mareschal, Jean-Claude Musset, Julien |
author_sort |
Guillou-Frottier, Laurent |
title |
Ground surface temperature history in central Canada inferred from 10 selected borehole temperature profiles |
title_short |
Ground surface temperature history in central Canada inferred from 10 selected borehole temperature profiles |
title_full |
Ground surface temperature history in central Canada inferred from 10 selected borehole temperature profiles |
title_fullStr |
Ground surface temperature history in central Canada inferred from 10 selected borehole temperature profiles |
title_full_unstemmed |
Ground surface temperature history in central Canada inferred from 10 selected borehole temperature profiles |
title_sort |
ground surface temperature history in central canada inferred from 10 selected borehole temperature profiles |
publisher |
HAL CCSD |
publishDate |
1998 |
url |
https://brgm.hal.science/hal-00790790 https://doi.org/10.1029/98JB00021 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://brgm.hal.science/hal-00790790 Journal of Geophysical Research, 1998, 103 (B4), pp.7385-7397. ⟨10.1029/98JB00021⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/98JB00021 hal-00790790 https://brgm.hal.science/hal-00790790 doi:10.1029/98JB00021 |
op_doi |
https://doi.org/10.1029/98JB00021 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
103 |
container_issue |
B4 |
container_start_page |
7385 |
op_container_end_page |
7397 |
_version_ |
1802645426299469824 |