Contrasts in Arctic shelf sea-ice regimes and some implications: Beaufort Sea versus Laptev Sea
The winter ice-regime of the <80 km wide Alaskan Beaufort Sea shelf is characterized by compression and shearing, resulting in the formation of major grounded pressure ridge systems stabilizing the fast ice on the mid-shelf, and essentially no open-water areas. In contrast, the winter ice-regime...
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Elsevier
1994
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Online Access: | https://oceanrep.geomar.de/id/eprint/28768/ https://oceanrep.geomar.de/id/eprint/28768/1/Reimnitz.pdf https://doi.org/10.1016/0025-3227(94)90182-1 |
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ftoceanrep:oai:oceanrep.geomar.de:28768 2023-05-15T14:26:51+02:00 Contrasts in Arctic shelf sea-ice regimes and some implications: Beaufort Sea versus Laptev Sea Reimnitz, Erk Dethleff, Dirk Nürnberg, Dirk 1994-07 text https://oceanrep.geomar.de/id/eprint/28768/ https://oceanrep.geomar.de/id/eprint/28768/1/Reimnitz.pdf https://doi.org/10.1016/0025-3227(94)90182-1 en eng Elsevier https://oceanrep.geomar.de/id/eprint/28768/1/Reimnitz.pdf Reimnitz, E., Dethleff, D. and Nürnberg, D. (1994) Contrasts in Arctic shelf sea-ice regimes and some implications: Beaufort Sea versus Laptev Sea. Marine Geology, 119 (3-4). pp. 215-225. DOI 10.1016/0025-3227(94)90182-1 <https://doi.org/10.1016/0025-3227%2894%2990182-1>. doi:10.1016/0025-3227(94)90182-1 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 1994 ftoceanrep https://doi.org/10.1016/0025-3227(94)90182-1 2023-04-07T15:19:21Z The winter ice-regime of the <80 km wide Alaskan Beaufort Sea shelf is characterized by compression and shearing, resulting in the formation of major grounded pressure ridge systems stabilizing the fast ice on the mid-shelf, and essentially no open-water areas. In contrast, the winter ice-regime of the 500-km wide Laptev Sea shelf is controlled by winds blowing from land to sea, and is therefore dilational. A perennial polynya borders the hundreds of kilometers-wide and very smooth fast ice offshore. In this body of open water, rapidly forming ice is continuously advected offshore by the mean wind field, making the Laptev Sea the single major ice factory for the Arctic Ocean and Transpolar Drift. Conversely, with summer warming this dark polynya turns into an area of high heat gain, which results in the retreat of the ice edge to a much higher latitude and greater distance (>500 km) from the mainland than in the Beaufort Sea. As a result, the annual freeze-up does not incorporate old, deep-draft ice, and with a lack of compression, such deep-draft ice is not generated in situ, as on the Beaufort Sea shelf. The Laptev Sea has as much as 1000 km of fetch at the end of summer, when freezing storms move in and large (6 m) waves can form. Also, for the first three winter months, the polynya lies inshore at a water depth of only 10 m. Turbulence and freezing are excellent conditions for sediment entrainment by frazil and anchor ice, when compared to conditions in the short-fetched Beaufort Sea. We expect entrainment to occur yearly. Different from the intensely ice-gouged Beaufort Sea shelf, hydraulic bedforms probably dominate in the Laptev Sea. Corresponding with the large volume of ice produced, more dense water is generated in the Laptev Sea, possibly accompanied by downslope sediment transport. Thermohaline convection at the midshelf polynya, together with the reduced rate of bottom disruption by ice keels, may enhance benthic productivity and permit establishment of open-shelf benthic communities which in ... Article in Journal/Newspaper Arctic Arctic Arctic Ocean Beaufort Sea laptev Laptev Sea Sea ice OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Arctic Ocean Laptev Sea Marine Geology 119 3-4 215 225 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The winter ice-regime of the <80 km wide Alaskan Beaufort Sea shelf is characterized by compression and shearing, resulting in the formation of major grounded pressure ridge systems stabilizing the fast ice on the mid-shelf, and essentially no open-water areas. In contrast, the winter ice-regime of the 500-km wide Laptev Sea shelf is controlled by winds blowing from land to sea, and is therefore dilational. A perennial polynya borders the hundreds of kilometers-wide and very smooth fast ice offshore. In this body of open water, rapidly forming ice is continuously advected offshore by the mean wind field, making the Laptev Sea the single major ice factory for the Arctic Ocean and Transpolar Drift. Conversely, with summer warming this dark polynya turns into an area of high heat gain, which results in the retreat of the ice edge to a much higher latitude and greater distance (>500 km) from the mainland than in the Beaufort Sea. As a result, the annual freeze-up does not incorporate old, deep-draft ice, and with a lack of compression, such deep-draft ice is not generated in situ, as on the Beaufort Sea shelf. The Laptev Sea has as much as 1000 km of fetch at the end of summer, when freezing storms move in and large (6 m) waves can form. Also, for the first three winter months, the polynya lies inshore at a water depth of only 10 m. Turbulence and freezing are excellent conditions for sediment entrainment by frazil and anchor ice, when compared to conditions in the short-fetched Beaufort Sea. We expect entrainment to occur yearly. Different from the intensely ice-gouged Beaufort Sea shelf, hydraulic bedforms probably dominate in the Laptev Sea. Corresponding with the large volume of ice produced, more dense water is generated in the Laptev Sea, possibly accompanied by downslope sediment transport. Thermohaline convection at the midshelf polynya, together with the reduced rate of bottom disruption by ice keels, may enhance benthic productivity and permit establishment of open-shelf benthic communities which in ... |
format |
Article in Journal/Newspaper |
author |
Reimnitz, Erk Dethleff, Dirk Nürnberg, Dirk |
spellingShingle |
Reimnitz, Erk Dethleff, Dirk Nürnberg, Dirk Contrasts in Arctic shelf sea-ice regimes and some implications: Beaufort Sea versus Laptev Sea |
author_facet |
Reimnitz, Erk Dethleff, Dirk Nürnberg, Dirk |
author_sort |
Reimnitz, Erk |
title |
Contrasts in Arctic shelf sea-ice regimes and some implications: Beaufort Sea versus Laptev Sea |
title_short |
Contrasts in Arctic shelf sea-ice regimes and some implications: Beaufort Sea versus Laptev Sea |
title_full |
Contrasts in Arctic shelf sea-ice regimes and some implications: Beaufort Sea versus Laptev Sea |
title_fullStr |
Contrasts in Arctic shelf sea-ice regimes and some implications: Beaufort Sea versus Laptev Sea |
title_full_unstemmed |
Contrasts in Arctic shelf sea-ice regimes and some implications: Beaufort Sea versus Laptev Sea |
title_sort |
contrasts in arctic shelf sea-ice regimes and some implications: beaufort sea versus laptev sea |
publisher |
Elsevier |
publishDate |
1994 |
url |
https://oceanrep.geomar.de/id/eprint/28768/ https://oceanrep.geomar.de/id/eprint/28768/1/Reimnitz.pdf https://doi.org/10.1016/0025-3227(94)90182-1 |
geographic |
Arctic Arctic Ocean Laptev Sea |
geographic_facet |
Arctic Arctic Ocean Laptev Sea |
genre |
Arctic Arctic Arctic Ocean Beaufort Sea laptev Laptev Sea Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean Beaufort Sea laptev Laptev Sea Sea ice |
op_relation |
https://oceanrep.geomar.de/id/eprint/28768/1/Reimnitz.pdf Reimnitz, E., Dethleff, D. and Nürnberg, D. (1994) Contrasts in Arctic shelf sea-ice regimes and some implications: Beaufort Sea versus Laptev Sea. Marine Geology, 119 (3-4). pp. 215-225. DOI 10.1016/0025-3227(94)90182-1 <https://doi.org/10.1016/0025-3227%2894%2990182-1>. doi:10.1016/0025-3227(94)90182-1 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/0025-3227(94)90182-1 |
container_title |
Marine Geology |
container_volume |
119 |
container_issue |
3-4 |
container_start_page |
215 |
op_container_end_page |
225 |
_version_ |
1766300293910233088 |