The oxygen isotopic composition of seawater during the Last Glacial Maximum
High-resolution oxygen and hydrogen isotope measurements were made on pore fluids from deep-sea sediments from sites in the North and South Atlantic. The data provide direct measurements of changes in the isotopic composition of bottom waters during the Last Glacial Maximum (LGM). Results from Ocean...
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ftcaltechauth:oai:authors.library.caltech.edu:33598 2023-05-15T17:13:54+02:00 The oxygen isotopic composition of seawater during the Last Glacial Maximum Schrag, Daniel P. Adkins, Jess F. McIntyre, Katherine Alexander, Jane L. Hodell, David A. Charles, Christopher D. McManus, Jerry F. 2002-01 https://authors.library.caltech.edu/33598/ https://resolver.caltech.edu/CaltechAUTHORS:20120828-095932442 unknown Elsevier Schrag, Daniel P. and Adkins, Jess F. and McIntyre, Katherine and Alexander, Jane L. and Hodell, David A. and Charles, Christopher D. and McManus, Jerry F. (2002) The oxygen isotopic composition of seawater during the Last Glacial Maximum. Quaternary Science Reviews, 21 (1-3). pp. 331-342. ISSN 0277-3791. doi:10.1016/S0277-3791(01)00110-X. https://resolver.caltech.edu/CaltechAUTHORS:20120828-095932442 <https://resolver.caltech.edu/CaltechAUTHORS:20120828-095932442> Article PeerReviewed 2002 ftcaltechauth https://doi.org/10.1016/S0277-3791(01)00110-X 2021-11-11T18:50:53Z High-resolution oxygen and hydrogen isotope measurements were made on pore fluids from deep-sea sediments from sites in the North and South Atlantic. The data provide direct measurements of changes in the isotopic composition of bottom waters during the Last Glacial Maximum (LGM). Results from Ocean Drilling Program (ODP) Site 981 in the North Atlantic, currently bathed in North Atlantic Deep Water (NADW) reproduces previous results from the Ceara and Bermuda Rises, constraining the glacial–interglacial change in δ^(18)O of the deep Atlantic to be 0.7–0.8‰. Results from Site 984, which is located north of Site 981 and at a shallower water depth, yield a similar value (0.8‰), providing insight into the properties of Glacial North Atlantic Intermediate Water (GNAIW). Sites from ODP Leg 177 in the South Atlantic span the modern boundary between northern and southern sources of deep water. Data from the northern site (1088) yield a similar result to sites in the tropical and North Atlantic (0.7‰). At the southern site (1093), located south of the polar front, the change is substantially larger (1.1‰), representing the change in δ^(18)O of southern source waters since the LGM. These results confirm previous estimates that the global average change in δ^(18)O of seawater is 1.0±0.1‰. Hydrogen isotopes measured on pore fluids from three sites are consistent with the oxygen isotopes from these locations, giving further support to these results. At all sites studied, the temperature of the deep ocean during the LGM, calculated by combining the pore fluid results with oxygen isotope data from benthic foraminifera, was within 1°C of the freezing point of seawater. Article in Journal/Newspaper NADW North Atlantic Deep Water North Atlantic Caltech Authors (California Institute of Technology) Quaternary Science Reviews 21 1-3 331 342 |
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Caltech Authors (California Institute of Technology) |
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High-resolution oxygen and hydrogen isotope measurements were made on pore fluids from deep-sea sediments from sites in the North and South Atlantic. The data provide direct measurements of changes in the isotopic composition of bottom waters during the Last Glacial Maximum (LGM). Results from Ocean Drilling Program (ODP) Site 981 in the North Atlantic, currently bathed in North Atlantic Deep Water (NADW) reproduces previous results from the Ceara and Bermuda Rises, constraining the glacial–interglacial change in δ^(18)O of the deep Atlantic to be 0.7–0.8‰. Results from Site 984, which is located north of Site 981 and at a shallower water depth, yield a similar value (0.8‰), providing insight into the properties of Glacial North Atlantic Intermediate Water (GNAIW). Sites from ODP Leg 177 in the South Atlantic span the modern boundary between northern and southern sources of deep water. Data from the northern site (1088) yield a similar result to sites in the tropical and North Atlantic (0.7‰). At the southern site (1093), located south of the polar front, the change is substantially larger (1.1‰), representing the change in δ^(18)O of southern source waters since the LGM. These results confirm previous estimates that the global average change in δ^(18)O of seawater is 1.0±0.1‰. Hydrogen isotopes measured on pore fluids from three sites are consistent with the oxygen isotopes from these locations, giving further support to these results. At all sites studied, the temperature of the deep ocean during the LGM, calculated by combining the pore fluid results with oxygen isotope data from benthic foraminifera, was within 1°C of the freezing point of seawater. |
format |
Article in Journal/Newspaper |
author |
Schrag, Daniel P. Adkins, Jess F. McIntyre, Katherine Alexander, Jane L. Hodell, David A. Charles, Christopher D. McManus, Jerry F. |
spellingShingle |
Schrag, Daniel P. Adkins, Jess F. McIntyre, Katherine Alexander, Jane L. Hodell, David A. Charles, Christopher D. McManus, Jerry F. The oxygen isotopic composition of seawater during the Last Glacial Maximum |
author_facet |
Schrag, Daniel P. Adkins, Jess F. McIntyre, Katherine Alexander, Jane L. Hodell, David A. Charles, Christopher D. McManus, Jerry F. |
author_sort |
Schrag, Daniel P. |
title |
The oxygen isotopic composition of seawater during the Last Glacial Maximum |
title_short |
The oxygen isotopic composition of seawater during the Last Glacial Maximum |
title_full |
The oxygen isotopic composition of seawater during the Last Glacial Maximum |
title_fullStr |
The oxygen isotopic composition of seawater during the Last Glacial Maximum |
title_full_unstemmed |
The oxygen isotopic composition of seawater during the Last Glacial Maximum |
title_sort |
oxygen isotopic composition of seawater during the last glacial maximum |
publisher |
Elsevier |
publishDate |
2002 |
url |
https://authors.library.caltech.edu/33598/ https://resolver.caltech.edu/CaltechAUTHORS:20120828-095932442 |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_relation |
Schrag, Daniel P. and Adkins, Jess F. and McIntyre, Katherine and Alexander, Jane L. and Hodell, David A. and Charles, Christopher D. and McManus, Jerry F. (2002) The oxygen isotopic composition of seawater during the Last Glacial Maximum. Quaternary Science Reviews, 21 (1-3). pp. 331-342. ISSN 0277-3791. doi:10.1016/S0277-3791(01)00110-X. https://resolver.caltech.edu/CaltechAUTHORS:20120828-095932442 <https://resolver.caltech.edu/CaltechAUTHORS:20120828-095932442> |
op_doi |
https://doi.org/10.1016/S0277-3791(01)00110-X |
container_title |
Quaternary Science Reviews |
container_volume |
21 |
container_issue |
1-3 |
container_start_page |
331 |
op_container_end_page |
342 |
_version_ |
1766071099526742016 |