The Salinity, Temperature, and δ18O of the Glacial Deep Ocean
We use pore fluid measurements of the chloride concentration and the oxygen isotopic composition from Ocean Drilling Program cores to reconstruct salinity and temperature of the deep ocean during the Last Glacial Maximum (LGM). Our data show that the temperatures of the deep Pacific, Southern, and A...
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American Association for the Advancement of Science
2002
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ftcaltechauth:oai:authors.library.caltech.edu:33608 2023-05-15T16:41:59+02:00 The Salinity, Temperature, and δ18O of the Glacial Deep Ocean Adkins, Jess F. McIntyre, Katherine Schrag, Daniel P. 2002-11-29 https://authors.library.caltech.edu/33608/ https://resolver.caltech.edu/CaltechAUTHORS:20120828-115444522 unknown American Association for the Advancement of Science Adkins, Jess F. and McIntyre, Katherine and Schrag, Daniel P. (2002) The Salinity, Temperature, and δ18O of the Glacial Deep Ocean. Science, 298 (5599). pp. 1769-1773. ISSN 0036-8075. doi:10.1126/science.1076252. https://resolver.caltech.edu/CaltechAUTHORS:20120828-115444522 <https://resolver.caltech.edu/CaltechAUTHORS:20120828-115444522> Article PeerReviewed 2002 ftcaltechauth https://doi.org/10.1126/science.1076252 2021-11-11T18:50:53Z We use pore fluid measurements of the chloride concentration and the oxygen isotopic composition from Ocean Drilling Program cores to reconstruct salinity and temperature of the deep ocean during the Last Glacial Maximum (LGM). Our data show that the temperatures of the deep Pacific, Southern, and Atlantic oceans during the LGM were relatively homogeneous and within error of the freezing point of seawater at the ocean's surface. Our chloride data show that the glacial stratification was dominated by salinity variations, in contrast with the modern ocean, for which temperature plays a primary role. During the LGM the Southern Ocean contained the saltiest water in the deep ocean. This reversal of the modern salinity contrast between the North and South Atlantic implies that the freshwater budget at the poles must have been quite different. A strict conversion of mean salinity at the LGM to equivalent sea-level change yields a value in excess of 140 meters. However, the storage of fresh water in ice shelves and/or groundwater reserves implies that glacial salinity is a poor predictor of mean sea level. Article in Journal/Newspaper Ice Shelves Southern Ocean Caltech Authors (California Institute of Technology) Pacific Southern Ocean Science 298 5599 1769 1773 |
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Caltech Authors (California Institute of Technology) |
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description |
We use pore fluid measurements of the chloride concentration and the oxygen isotopic composition from Ocean Drilling Program cores to reconstruct salinity and temperature of the deep ocean during the Last Glacial Maximum (LGM). Our data show that the temperatures of the deep Pacific, Southern, and Atlantic oceans during the LGM were relatively homogeneous and within error of the freezing point of seawater at the ocean's surface. Our chloride data show that the glacial stratification was dominated by salinity variations, in contrast with the modern ocean, for which temperature plays a primary role. During the LGM the Southern Ocean contained the saltiest water in the deep ocean. This reversal of the modern salinity contrast between the North and South Atlantic implies that the freshwater budget at the poles must have been quite different. A strict conversion of mean salinity at the LGM to equivalent sea-level change yields a value in excess of 140 meters. However, the storage of fresh water in ice shelves and/or groundwater reserves implies that glacial salinity is a poor predictor of mean sea level. |
format |
Article in Journal/Newspaper |
author |
Adkins, Jess F. McIntyre, Katherine Schrag, Daniel P. |
spellingShingle |
Adkins, Jess F. McIntyre, Katherine Schrag, Daniel P. The Salinity, Temperature, and δ18O of the Glacial Deep Ocean |
author_facet |
Adkins, Jess F. McIntyre, Katherine Schrag, Daniel P. |
author_sort |
Adkins, Jess F. |
title |
The Salinity, Temperature, and δ18O of the Glacial Deep Ocean |
title_short |
The Salinity, Temperature, and δ18O of the Glacial Deep Ocean |
title_full |
The Salinity, Temperature, and δ18O of the Glacial Deep Ocean |
title_fullStr |
The Salinity, Temperature, and δ18O of the Glacial Deep Ocean |
title_full_unstemmed |
The Salinity, Temperature, and δ18O of the Glacial Deep Ocean |
title_sort |
salinity, temperature, and δ18o of the glacial deep ocean |
publisher |
American Association for the Advancement of Science |
publishDate |
2002 |
url |
https://authors.library.caltech.edu/33608/ https://resolver.caltech.edu/CaltechAUTHORS:20120828-115444522 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Ice Shelves Southern Ocean |
genre_facet |
Ice Shelves Southern Ocean |
op_relation |
Adkins, Jess F. and McIntyre, Katherine and Schrag, Daniel P. (2002) The Salinity, Temperature, and δ18O of the Glacial Deep Ocean. Science, 298 (5599). pp. 1769-1773. ISSN 0036-8075. doi:10.1126/science.1076252. https://resolver.caltech.edu/CaltechAUTHORS:20120828-115444522 <https://resolver.caltech.edu/CaltechAUTHORS:20120828-115444522> |
op_doi |
https://doi.org/10.1126/science.1076252 |
container_title |
Science |
container_volume |
298 |
container_issue |
5599 |
container_start_page |
1769 |
op_container_end_page |
1773 |
_version_ |
1766032446060494848 |