Denmark Strait overflow for Last Glacial maximum to Holocene conditions
The Denmark Strait plays an important role as a dense water gateway between the Arctic and the subpolar North Atlantic. Previous studies have shown that the volume transport over the sill is limited by hydraulic constraints. A regional ocean-circulation model (ROMS) with a horizontal resolution of ≈...
Published in: | Paleoceanography |
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Language: | English |
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AGU (American Geophysical Union)
2004
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Online Access: | https://oceanrep.geomar.de/id/eprint/892/ https://oceanrep.geomar.de/id/eprint/892/1/palo1113.pdf https://doi.org/10.1029/2003PA000972 |
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ftoceanrep:oai:oceanrep.geomar.de:892 2023-05-15T15:09:10+02:00 Denmark Strait overflow for Last Glacial maximum to Holocene conditions Kösters, Frank Käse, Rolf H. Fleming, K. Wolf, D. 2004 text https://oceanrep.geomar.de/id/eprint/892/ https://oceanrep.geomar.de/id/eprint/892/1/palo1113.pdf https://doi.org/10.1029/2003PA000972 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/892/1/palo1113.pdf Kösters, F., Käse, R. H., Fleming, K. and Wolf, D. (2004) Denmark Strait overflow for Last Glacial maximum to Holocene conditions. Paleoceanography, 19 (PA2019). DOI 10.1029/2003PA000972 <https://doi.org/10.1029/2003PA000972>. doi:10.1029/2003PA000972 info:eu-repo/semantics/embargoedAccess Article PeerReviewed 2004 ftoceanrep https://doi.org/10.1029/2003PA000972 2023-04-07T14:42:54Z The Denmark Strait plays an important role as a dense water gateway between the Arctic and the subpolar North Atlantic. Previous studies have shown that the volume transport over the sill is limited by hydraulic constraints. A regional ocean-circulation model (ROMS) with a horizontal resolution of ≈1/20° degree and 30 sigma layers in the vertical is applied to study the through flow characteristics for Last Glacial Maximum to Holocene conditions. The bathymetry of the gateway region is obtained from a geodynamic model that takes into account the differential ice loading of the adjacent continents. First, the upstream reservoir conditions are systematically changed to test hydraulic limitations for altered bathymetry. Generally, the through flow is less than the predicted maximal value from hydraulic theory by almost 50%. The results indicate that the reduction in gateway depth and aperture owing to glacial-isostatic processes alone lead to a considerable further reduction of the overflow, by approximately 33%, compared to the present day. Second, the through flow is modeled using average density profiles and wind stress from global model data. The reduction in the density-driven part of the overflow is partly compensated by an enhanced wind stress but is still reduced by a factor of 5. Owing to the narrowing of the strait during the glacial and the increased northerly wind, the North Icelandic Irminger Current was strongly reduced but still existent. Article in Journal/Newspaper Arctic Denmark Strait North Atlantic North Icelandic Irminger Current OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Paleoceanography 19 2 n/a n/a |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The Denmark Strait plays an important role as a dense water gateway between the Arctic and the subpolar North Atlantic. Previous studies have shown that the volume transport over the sill is limited by hydraulic constraints. A regional ocean-circulation model (ROMS) with a horizontal resolution of ≈1/20° degree and 30 sigma layers in the vertical is applied to study the through flow characteristics for Last Glacial Maximum to Holocene conditions. The bathymetry of the gateway region is obtained from a geodynamic model that takes into account the differential ice loading of the adjacent continents. First, the upstream reservoir conditions are systematically changed to test hydraulic limitations for altered bathymetry. Generally, the through flow is less than the predicted maximal value from hydraulic theory by almost 50%. The results indicate that the reduction in gateway depth and aperture owing to glacial-isostatic processes alone lead to a considerable further reduction of the overflow, by approximately 33%, compared to the present day. Second, the through flow is modeled using average density profiles and wind stress from global model data. The reduction in the density-driven part of the overflow is partly compensated by an enhanced wind stress but is still reduced by a factor of 5. Owing to the narrowing of the strait during the glacial and the increased northerly wind, the North Icelandic Irminger Current was strongly reduced but still existent. |
format |
Article in Journal/Newspaper |
author |
Kösters, Frank Käse, Rolf H. Fleming, K. Wolf, D. |
spellingShingle |
Kösters, Frank Käse, Rolf H. Fleming, K. Wolf, D. Denmark Strait overflow for Last Glacial maximum to Holocene conditions |
author_facet |
Kösters, Frank Käse, Rolf H. Fleming, K. Wolf, D. |
author_sort |
Kösters, Frank |
title |
Denmark Strait overflow for Last Glacial maximum to Holocene conditions |
title_short |
Denmark Strait overflow for Last Glacial maximum to Holocene conditions |
title_full |
Denmark Strait overflow for Last Glacial maximum to Holocene conditions |
title_fullStr |
Denmark Strait overflow for Last Glacial maximum to Holocene conditions |
title_full_unstemmed |
Denmark Strait overflow for Last Glacial maximum to Holocene conditions |
title_sort |
denmark strait overflow for last glacial maximum to holocene conditions |
publisher |
AGU (American Geophysical Union) |
publishDate |
2004 |
url |
https://oceanrep.geomar.de/id/eprint/892/ https://oceanrep.geomar.de/id/eprint/892/1/palo1113.pdf https://doi.org/10.1029/2003PA000972 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Denmark Strait North Atlantic North Icelandic Irminger Current |
genre_facet |
Arctic Denmark Strait North Atlantic North Icelandic Irminger Current |
op_relation |
https://oceanrep.geomar.de/id/eprint/892/1/palo1113.pdf Kösters, F., Käse, R. H., Fleming, K. and Wolf, D. (2004) Denmark Strait overflow for Last Glacial maximum to Holocene conditions. Paleoceanography, 19 (PA2019). DOI 10.1029/2003PA000972 <https://doi.org/10.1029/2003PA000972>. doi:10.1029/2003PA000972 |
op_rights |
info:eu-repo/semantics/embargoedAccess |
op_doi |
https://doi.org/10.1029/2003PA000972 |
container_title |
Paleoceanography |
container_volume |
19 |
container_issue |
2 |
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1766340390454034432 |