Diachronous evolution of sea surface conditions in the Labrador Sea and Baffin Bay since the last deglaciation
Assessing changes in sea surface conditions due to the effects of past freshwater outflow through Baffin Bay and Davis Strait to the Labrador Sea, hereafter referred to as the Baffin Bay corridor, is relevant in understanding the variability in Labrador Sea Water (LSW) formation. Here, regional chan...
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crsagepubl:10.1177/0959683615591352 2024-10-13T14:06:11+00:00 Diachronous evolution of sea surface conditions in the Labrador Sea and Baffin Bay since the last deglaciation Gibb, Olivia T Steinhauer, Sarah Fréchette, Bianca de Vernal, Anne Hillaire-Marcel, Claude 2015 http://dx.doi.org/10.1177/0959683615591352 https://journals.sagepub.com/doi/pdf/10.1177/0959683615591352 https://journals.sagepub.com/doi/full-xml/10.1177/0959683615591352 en eng SAGE Publications https://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 25, issue 12, page 1882-1897 ISSN 0959-6836 1477-0911 journal-article 2015 crsagepubl https://doi.org/10.1177/0959683615591352 2024-09-24T04:13:06Z Assessing changes in sea surface conditions due to the effects of past freshwater outflow through Baffin Bay and Davis Strait to the Labrador Sea, hereafter referred to as the Baffin Bay corridor, is relevant in understanding the variability in Labrador Sea Water (LSW) formation. Here, regional changes in oceanographic circulation and sea surface conditions are reconstructed based on organic-walled dinoflagellate cyst (dinocyst) assemblages from four cores collected from deep, central sites of the Baffin Bay corridor. All cores exhibit a major shift in dinocyst assemblages since the late glacial period. This shift consists of a change from a polar–subpolar heterotrophic species assemblage tolerating cold and near permanent ice-covered conditions, to assemblages characterized by a higher diversity and the occurrence of phototrophic taxa associated with mild conditions. Sea surface reconstructions from the modern analogue technique display a shift from harsh, quasi-perennial ice cover to warmer summer sea surface temperatures and a seasonal sea ice. South of the Davis Strait sill, this regime shift occurred at ca. 11.9 cal ka BP due to the influence of North Atlantic waters. Baffin Bay, however, remained densely sea ice covered until about 7.4 cal ka BP, when these warmer waters penetrated into Baffin Bay and mixed with the West Greenland Current (WGC). This mixing was facilitated by the retreat of the Greenland and Laurentide Ice Sheet (LIS) margins. A major change in Labrador Sea surface conditions occurred nearly at about the same time (~7.6 cal ka BP) when the strong stratification of surface waters weakened because of the reduction in meltwater supplies from the LIS that allowed winter convection and the inception of LSW formation. All these new records demonstrate large amplitude fluctuations in sea surface conditions tightly controlled by the relative strengths and shifts of the warmer WGC and colder Baffin Island Current. Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin Island Baffin Davis Strait Greenland Ice Sheet Labrador Sea North Atlantic Sea ice SAGE Publications Baffin Bay Baffin Island Greenland The Holocene 25 12 1882 1897 |
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English |
description |
Assessing changes in sea surface conditions due to the effects of past freshwater outflow through Baffin Bay and Davis Strait to the Labrador Sea, hereafter referred to as the Baffin Bay corridor, is relevant in understanding the variability in Labrador Sea Water (LSW) formation. Here, regional changes in oceanographic circulation and sea surface conditions are reconstructed based on organic-walled dinoflagellate cyst (dinocyst) assemblages from four cores collected from deep, central sites of the Baffin Bay corridor. All cores exhibit a major shift in dinocyst assemblages since the late glacial period. This shift consists of a change from a polar–subpolar heterotrophic species assemblage tolerating cold and near permanent ice-covered conditions, to assemblages characterized by a higher diversity and the occurrence of phototrophic taxa associated with mild conditions. Sea surface reconstructions from the modern analogue technique display a shift from harsh, quasi-perennial ice cover to warmer summer sea surface temperatures and a seasonal sea ice. South of the Davis Strait sill, this regime shift occurred at ca. 11.9 cal ka BP due to the influence of North Atlantic waters. Baffin Bay, however, remained densely sea ice covered until about 7.4 cal ka BP, when these warmer waters penetrated into Baffin Bay and mixed with the West Greenland Current (WGC). This mixing was facilitated by the retreat of the Greenland and Laurentide Ice Sheet (LIS) margins. A major change in Labrador Sea surface conditions occurred nearly at about the same time (~7.6 cal ka BP) when the strong stratification of surface waters weakened because of the reduction in meltwater supplies from the LIS that allowed winter convection and the inception of LSW formation. All these new records demonstrate large amplitude fluctuations in sea surface conditions tightly controlled by the relative strengths and shifts of the warmer WGC and colder Baffin Island Current. |
format |
Article in Journal/Newspaper |
author |
Gibb, Olivia T Steinhauer, Sarah Fréchette, Bianca de Vernal, Anne Hillaire-Marcel, Claude |
spellingShingle |
Gibb, Olivia T Steinhauer, Sarah Fréchette, Bianca de Vernal, Anne Hillaire-Marcel, Claude Diachronous evolution of sea surface conditions in the Labrador Sea and Baffin Bay since the last deglaciation |
author_facet |
Gibb, Olivia T Steinhauer, Sarah Fréchette, Bianca de Vernal, Anne Hillaire-Marcel, Claude |
author_sort |
Gibb, Olivia T |
title |
Diachronous evolution of sea surface conditions in the Labrador Sea and Baffin Bay since the last deglaciation |
title_short |
Diachronous evolution of sea surface conditions in the Labrador Sea and Baffin Bay since the last deglaciation |
title_full |
Diachronous evolution of sea surface conditions in the Labrador Sea and Baffin Bay since the last deglaciation |
title_fullStr |
Diachronous evolution of sea surface conditions in the Labrador Sea and Baffin Bay since the last deglaciation |
title_full_unstemmed |
Diachronous evolution of sea surface conditions in the Labrador Sea and Baffin Bay since the last deglaciation |
title_sort |
diachronous evolution of sea surface conditions in the labrador sea and baffin bay since the last deglaciation |
publisher |
SAGE Publications |
publishDate |
2015 |
url |
http://dx.doi.org/10.1177/0959683615591352 https://journals.sagepub.com/doi/pdf/10.1177/0959683615591352 https://journals.sagepub.com/doi/full-xml/10.1177/0959683615591352 |
geographic |
Baffin Bay Baffin Island Greenland |
geographic_facet |
Baffin Bay Baffin Island Greenland |
genre |
Baffin Bay Baffin Bay Baffin Island Baffin Davis Strait Greenland Ice Sheet Labrador Sea North Atlantic Sea ice |
genre_facet |
Baffin Bay Baffin Bay Baffin Island Baffin Davis Strait Greenland Ice Sheet Labrador Sea North Atlantic Sea ice |
op_source |
The Holocene volume 25, issue 12, page 1882-1897 ISSN 0959-6836 1477-0911 |
op_rights |
https://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1177/0959683615591352 |
container_title |
The Holocene |
container_volume |
25 |
container_issue |
12 |
container_start_page |
1882 |
op_container_end_page |
1897 |
_version_ |
1812812241510072320 |