Meltwater pulse recorded in Last Interglacial mollusk shells from Bermuda
The warm climate of Bermuda today is modulated by the nearby presence of the Gulf Stream current. However, iceberg scours in the Florida Strait and the presence of ice-rafted debris in Bermuda Rise sediments indicate that, during the last deglaciation, icebergs discharged from the Laurentide Ice She...
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Amer Geophysical Union
2017
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ftarchimer:oai:archimer.ifremer.fr:53186 2023-05-15T16:28:07+02:00 Meltwater pulse recorded in Last Interglacial mollusk shells from Bermuda Winkelstern, Ian Z. Rowe, Mark P. Lohmann, Kyger C. Defliese, William F. Petersen, Sierra V. Brewer, Aaron W. 2017-02 application/pdf https://archimer.ifremer.fr/doc/00420/53186/55022.pdf https://archimer.ifremer.fr/doc/00420/53186/55023.pdf https://archimer.ifremer.fr/doc/00420/53186/55024.xlsx https://doi.org/10.1002/2016PA003014 https://archimer.ifremer.fr/doc/00420/53186/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00420/53186/55022.pdf https://archimer.ifremer.fr/doc/00420/53186/55023.pdf https://archimer.ifremer.fr/doc/00420/53186/55024.xlsx doi:10.1002/2016PA003014 https://archimer.ifremer.fr/doc/00420/53186/ 2017. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2017-02 , Vol. 32 , N. 2 , P. 132-145 text Publication info:eu-repo/semantics/article 2017 ftarchimer https://doi.org/10.1002/2016PA003014 2021-09-23T20:30:24Z The warm climate of Bermuda today is modulated by the nearby presence of the Gulf Stream current. However, iceberg scours in the Florida Strait and the presence of ice-rafted debris in Bermuda Rise sediments indicate that, during the last deglaciation, icebergs discharged from the Laurentide Ice Sheet traveled as far south as subtropical latitudes. We present evidence that an event of similar magnitude affected the subtropics during the Last Interglacial, potentially due to melting of the Greenland Ice Sheet. Using the clumped isotope paleothermometer, we found temperatures similar to 10 degrees C colder and seawater delta O-18 values similar to 2% lower than modern in Last Interglacial Cittarium pica shells from Grape Bay, Bermuda. In contrast, Last Interglacial shells from Rocky Bay, Bermuda, record temperatures only slightly colder and seawater delta O-18 values similar to modern, likely representing more typical Last Interglacial conditions in Bermuda outside of a meltwater event. The significantly colder ocean temperatures observed in Grape Bay samples illustrate the extreme sensitivity of Bermudian climate to broad-scale ocean circulation changes. They indicate routine meltwater transport in the North Atlantic to near-equatorial latitudes, which would likely have resulted in disruption of the Atlantic Meridional Overturning Circulation. These data demonstrate that future melting of the Greenland Ice Sheet, a potential source of the Last Interglacial meltwater event, could have dramatic climate effects outside of the high latitudes. Article in Journal/Newspaper Greenland Ice Sheet North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Greenland Rocky Bay ENVELOPE(69.177,69.177,-49.559,-49.559) Paleoceanography 32 2 132 145 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
The warm climate of Bermuda today is modulated by the nearby presence of the Gulf Stream current. However, iceberg scours in the Florida Strait and the presence of ice-rafted debris in Bermuda Rise sediments indicate that, during the last deglaciation, icebergs discharged from the Laurentide Ice Sheet traveled as far south as subtropical latitudes. We present evidence that an event of similar magnitude affected the subtropics during the Last Interglacial, potentially due to melting of the Greenland Ice Sheet. Using the clumped isotope paleothermometer, we found temperatures similar to 10 degrees C colder and seawater delta O-18 values similar to 2% lower than modern in Last Interglacial Cittarium pica shells from Grape Bay, Bermuda. In contrast, Last Interglacial shells from Rocky Bay, Bermuda, record temperatures only slightly colder and seawater delta O-18 values similar to modern, likely representing more typical Last Interglacial conditions in Bermuda outside of a meltwater event. The significantly colder ocean temperatures observed in Grape Bay samples illustrate the extreme sensitivity of Bermudian climate to broad-scale ocean circulation changes. They indicate routine meltwater transport in the North Atlantic to near-equatorial latitudes, which would likely have resulted in disruption of the Atlantic Meridional Overturning Circulation. These data demonstrate that future melting of the Greenland Ice Sheet, a potential source of the Last Interglacial meltwater event, could have dramatic climate effects outside of the high latitudes. |
format |
Article in Journal/Newspaper |
author |
Winkelstern, Ian Z. Rowe, Mark P. Lohmann, Kyger C. Defliese, William F. Petersen, Sierra V. Brewer, Aaron W. |
spellingShingle |
Winkelstern, Ian Z. Rowe, Mark P. Lohmann, Kyger C. Defliese, William F. Petersen, Sierra V. Brewer, Aaron W. Meltwater pulse recorded in Last Interglacial mollusk shells from Bermuda |
author_facet |
Winkelstern, Ian Z. Rowe, Mark P. Lohmann, Kyger C. Defliese, William F. Petersen, Sierra V. Brewer, Aaron W. |
author_sort |
Winkelstern, Ian Z. |
title |
Meltwater pulse recorded in Last Interglacial mollusk shells from Bermuda |
title_short |
Meltwater pulse recorded in Last Interglacial mollusk shells from Bermuda |
title_full |
Meltwater pulse recorded in Last Interglacial mollusk shells from Bermuda |
title_fullStr |
Meltwater pulse recorded in Last Interglacial mollusk shells from Bermuda |
title_full_unstemmed |
Meltwater pulse recorded in Last Interglacial mollusk shells from Bermuda |
title_sort |
meltwater pulse recorded in last interglacial mollusk shells from bermuda |
publisher |
Amer Geophysical Union |
publishDate |
2017 |
url |
https://archimer.ifremer.fr/doc/00420/53186/55022.pdf https://archimer.ifremer.fr/doc/00420/53186/55023.pdf https://archimer.ifremer.fr/doc/00420/53186/55024.xlsx https://doi.org/10.1002/2016PA003014 https://archimer.ifremer.fr/doc/00420/53186/ |
long_lat |
ENVELOPE(69.177,69.177,-49.559,-49.559) |
geographic |
Greenland Rocky Bay |
geographic_facet |
Greenland Rocky Bay |
genre |
Greenland Ice Sheet North Atlantic |
genre_facet |
Greenland Ice Sheet North Atlantic |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2017-02 , Vol. 32 , N. 2 , P. 132-145 |
op_relation |
https://archimer.ifremer.fr/doc/00420/53186/55022.pdf https://archimer.ifremer.fr/doc/00420/53186/55023.pdf https://archimer.ifremer.fr/doc/00420/53186/55024.xlsx doi:10.1002/2016PA003014 https://archimer.ifremer.fr/doc/00420/53186/ |
op_rights |
2017. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1002/2016PA003014 |
container_title |
Paleoceanography |
container_volume |
32 |
container_issue |
2 |
container_start_page |
132 |
op_container_end_page |
145 |
_version_ |
1766017745874321408 |