The thermal regime of intertidal permafrost, George River estuary, Ungava Bay, Quebec
Permafrost in tidal-marsh sediments was studied along the estuary of George River, Ungava Bay, northern Quebec. In this macrotidal environment, wide tidal flats and marshes lie in bays along the shoreline. Discontinuous permafrost bodies occur in the silty sediments underlying the marshes in the upp...
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1992
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crcansciencepubl:10.1139/e92-023 2023-12-17T10:31:29+01:00 The thermal regime of intertidal permafrost, George River estuary, Ungava Bay, Quebec Allard, Michel Fortier, Richard Seguin, Maurice K. 1992 http://dx.doi.org/10.1139/e92-023 http://www.nrcresearchpress.com/doi/pdf/10.1139/e92-023 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 29, issue 2, page 249-259 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1992 crcansciencepubl https://doi.org/10.1139/e92-023 2023-11-19T13:38:19Z Permafrost in tidal-marsh sediments was studied along the estuary of George River, Ungava Bay, northern Quebec. In this macrotidal environment, wide tidal flats and marshes lie in bays along the shoreline. Discontinuous permafrost bodies occur in the silty sediments underlying the marshes in the upper part of the intertidal zone, where submersions by large tides and storm surges are rare and where the icefoot freezes to the ground in winter. The permafrost is about 5 m thick, saline, and ice poor. According to logged thermal data, a freezing-point depression of 0.9 °C is estimated for the intertidal sediments. Tidal submersions during the ice-free season have a transient warming effect on the soil profile due to water percolation in the active layer and delay freeze back at the beginning of winter. Observations in shallow drill holes and along a thermistor cable indicate that the intertidal permafrost degraded at the Kangiqsualujjuaq observation site from 1984 to 1987. From 1987 to 1990, observations and logged data clearly show aggradation and cooling of the permafrost. Those changes in ground thermal regime are the result of recent climatic variations. Article in Journal/Newspaper Ice Kangiqsualujjuaq permafrost Ungava Bay Canadian Science Publishing (via Crossref) Ungava Bay ENVELOPE(-67.489,-67.489,59.498,59.498) Kangiqsualujjuaq ENVELOPE(-65.948,-65.948,58.684,58.684) Canadian Journal of Earth Sciences 29 2 249 259 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Allard, Michel Fortier, Richard Seguin, Maurice K. The thermal regime of intertidal permafrost, George River estuary, Ungava Bay, Quebec |
topic_facet |
General Earth and Planetary Sciences |
description |
Permafrost in tidal-marsh sediments was studied along the estuary of George River, Ungava Bay, northern Quebec. In this macrotidal environment, wide tidal flats and marshes lie in bays along the shoreline. Discontinuous permafrost bodies occur in the silty sediments underlying the marshes in the upper part of the intertidal zone, where submersions by large tides and storm surges are rare and where the icefoot freezes to the ground in winter. The permafrost is about 5 m thick, saline, and ice poor. According to logged thermal data, a freezing-point depression of 0.9 °C is estimated for the intertidal sediments. Tidal submersions during the ice-free season have a transient warming effect on the soil profile due to water percolation in the active layer and delay freeze back at the beginning of winter. Observations in shallow drill holes and along a thermistor cable indicate that the intertidal permafrost degraded at the Kangiqsualujjuaq observation site from 1984 to 1987. From 1987 to 1990, observations and logged data clearly show aggradation and cooling of the permafrost. Those changes in ground thermal regime are the result of recent climatic variations. |
format |
Article in Journal/Newspaper |
author |
Allard, Michel Fortier, Richard Seguin, Maurice K. |
author_facet |
Allard, Michel Fortier, Richard Seguin, Maurice K. |
author_sort |
Allard, Michel |
title |
The thermal regime of intertidal permafrost, George River estuary, Ungava Bay, Quebec |
title_short |
The thermal regime of intertidal permafrost, George River estuary, Ungava Bay, Quebec |
title_full |
The thermal regime of intertidal permafrost, George River estuary, Ungava Bay, Quebec |
title_fullStr |
The thermal regime of intertidal permafrost, George River estuary, Ungava Bay, Quebec |
title_full_unstemmed |
The thermal regime of intertidal permafrost, George River estuary, Ungava Bay, Quebec |
title_sort |
thermal regime of intertidal permafrost, george river estuary, ungava bay, quebec |
publisher |
Canadian Science Publishing |
publishDate |
1992 |
url |
http://dx.doi.org/10.1139/e92-023 http://www.nrcresearchpress.com/doi/pdf/10.1139/e92-023 |
long_lat |
ENVELOPE(-67.489,-67.489,59.498,59.498) ENVELOPE(-65.948,-65.948,58.684,58.684) |
geographic |
Ungava Bay Kangiqsualujjuaq |
geographic_facet |
Ungava Bay Kangiqsualujjuaq |
genre |
Ice Kangiqsualujjuaq permafrost Ungava Bay |
genre_facet |
Ice Kangiqsualujjuaq permafrost Ungava Bay |
op_source |
Canadian Journal of Earth Sciences volume 29, issue 2, page 249-259 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e92-023 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
29 |
container_issue |
2 |
container_start_page |
249 |
op_container_end_page |
259 |
_version_ |
1785584801306116096 |