Tidal evolution of the northwest European shelf seas from the Last Glacial Maximum to the present
Two-dimensional paleotidal simulations have been undertaken to investigate tidal and tide-dependent changes (tidal amplitudes, tidal current velocities, seasonal stratificafion, peak bed stress vectors) that have occurred in the NW European shelf seas during the last 20 ka. The simulations test the...
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/19457 2023-05-15T16:35:38+02:00 Tidal evolution of the northwest European shelf seas from the Last Glacial Maximum to the present Uehara, Katsuto Scourse, James D. Horsburgh, Kevin J Lambeck, Kurt Purcell, Anthony 2015-12-07T22:19:40Z http://hdl.handle.net/1885/19457 unknown American Geophysical Union 0148-0227 http://hdl.handle.net/1885/19457 Journal of Geophysical Research Keywords: Glacial geology Ocean currents Sea ice Sea level Tides ice retreat Last Glacial Maximum Laurentide Ice Sheet ocean tide sea level change shelf sea stratification tidal current tidal modeling Atlantic Ocean Canada Celtic Sea Hudson Strait Journal article 2015 ftanucanberra 2015-12-28T23:19:11Z Two-dimensional paleotidal simulations have been undertaken to investigate tidal and tide-dependent changes (tidal amplitudes, tidal current velocities, seasonal stratificafion, peak bed stress vectors) that have occurred in the NW European shelf seas during the last 20 ka. The simulations test the effect of shelf-wide isostatic changes of sea level by incorporating results from two different crustal rebound models, and the effect of the ocean-tide variability by setting open boundary values either fixed to the present state or variable according to the results of a global paleotidal model. The use of the different crustal rebound models does not affect the overall changes in tidal patterns, but the timing of the changes is sensitive to the local isostatic effects that differ between the models. The incorporation of ocean-tide changes greatly augments the amplitude of tides and tidal currents in the Celtic and Malin seas before 10 ka BP, and has a large impact on the distribution of seasonally stratified conditions, magnitude of peak bed stress vectors and tidal dissipation in the shelf seas. The predictions on seasonal stratification are supported by well-dated evidence on tidal mixing front migration in the Celtic Sea. Additional experiments using the global model suggest that the variability of offshore tides has been caused mainly by changes of eustatic sea level and ice-sheet extent. In particular, a large decrease observed at 10-8 ka BP is attributed to the opening of Hudson Strait accompanied by the retreat of the Laurentide Ice Sheet. Article in Journal/Newspaper Hudson Strait Ice Sheet Sea ice Australian National University: ANU Digital Collections Canada Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Keywords: Glacial geology Ocean currents Sea ice Sea level Tides ice retreat Last Glacial Maximum Laurentide Ice Sheet ocean tide sea level change shelf sea stratification tidal current tidal modeling Atlantic Ocean Canada Celtic Sea Hudson Strait |
spellingShingle |
Keywords: Glacial geology Ocean currents Sea ice Sea level Tides ice retreat Last Glacial Maximum Laurentide Ice Sheet ocean tide sea level change shelf sea stratification tidal current tidal modeling Atlantic Ocean Canada Celtic Sea Hudson Strait Uehara, Katsuto Scourse, James D. Horsburgh, Kevin J Lambeck, Kurt Purcell, Anthony Tidal evolution of the northwest European shelf seas from the Last Glacial Maximum to the present |
topic_facet |
Keywords: Glacial geology Ocean currents Sea ice Sea level Tides ice retreat Last Glacial Maximum Laurentide Ice Sheet ocean tide sea level change shelf sea stratification tidal current tidal modeling Atlantic Ocean Canada Celtic Sea Hudson Strait |
description |
Two-dimensional paleotidal simulations have been undertaken to investigate tidal and tide-dependent changes (tidal amplitudes, tidal current velocities, seasonal stratificafion, peak bed stress vectors) that have occurred in the NW European shelf seas during the last 20 ka. The simulations test the effect of shelf-wide isostatic changes of sea level by incorporating results from two different crustal rebound models, and the effect of the ocean-tide variability by setting open boundary values either fixed to the present state or variable according to the results of a global paleotidal model. The use of the different crustal rebound models does not affect the overall changes in tidal patterns, but the timing of the changes is sensitive to the local isostatic effects that differ between the models. The incorporation of ocean-tide changes greatly augments the amplitude of tides and tidal currents in the Celtic and Malin seas before 10 ka BP, and has a large impact on the distribution of seasonally stratified conditions, magnitude of peak bed stress vectors and tidal dissipation in the shelf seas. The predictions on seasonal stratification are supported by well-dated evidence on tidal mixing front migration in the Celtic Sea. Additional experiments using the global model suggest that the variability of offshore tides has been caused mainly by changes of eustatic sea level and ice-sheet extent. In particular, a large decrease observed at 10-8 ka BP is attributed to the opening of Hudson Strait accompanied by the retreat of the Laurentide Ice Sheet. |
format |
Article in Journal/Newspaper |
author |
Uehara, Katsuto Scourse, James D. Horsburgh, Kevin J Lambeck, Kurt Purcell, Anthony |
author_facet |
Uehara, Katsuto Scourse, James D. Horsburgh, Kevin J Lambeck, Kurt Purcell, Anthony |
author_sort |
Uehara, Katsuto |
title |
Tidal evolution of the northwest European shelf seas from the Last Glacial Maximum to the present |
title_short |
Tidal evolution of the northwest European shelf seas from the Last Glacial Maximum to the present |
title_full |
Tidal evolution of the northwest European shelf seas from the Last Glacial Maximum to the present |
title_fullStr |
Tidal evolution of the northwest European shelf seas from the Last Glacial Maximum to the present |
title_full_unstemmed |
Tidal evolution of the northwest European shelf seas from the Last Glacial Maximum to the present |
title_sort |
tidal evolution of the northwest european shelf seas from the last glacial maximum to the present |
publisher |
American Geophysical Union |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/19457 |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) |
geographic |
Canada Hudson Hudson Strait |
geographic_facet |
Canada Hudson Hudson Strait |
genre |
Hudson Strait Ice Sheet Sea ice |
genre_facet |
Hudson Strait Ice Sheet Sea ice |
op_source |
Journal of Geophysical Research |
op_relation |
0148-0227 http://hdl.handle.net/1885/19457 |
_version_ |
1766025911084253184 |