Pore Fluids and the LGM Ocean Salinity–Reconsidered
Pore fluid chlorinity/salinity data from deep-sea cores related to the salinity maximum of the last glacial maximum (LGM) are analyzed using estimation methods deriving from linear control theory. With conventional diffusion coefficient values and no vertical advection, results show a very strong de...
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ftharvardudash:oai:dash.harvard.edu:1/23929296 2023-05-15T17:30:50+02:00 Pore Fluids and the LGM Ocean Salinity–Reconsidered Wunsch, Carl 2015 application/pdf http://nrs.harvard.edu/urn-3:HUL.InstRepos:23929296 https://doi.org/10.1016/j.quascirev.2016.01.015 en_US eng Elsevier doi:10.1016/j.quascirev.2016.01.015 Quaternary Science Reviews Quick submit: 2015-12-04T11:10:55-05:00 Wunsch, Carl. 2016. Pore fluids and the LGM ocean salinity - Reconsidered. Quaternary Science Reviews 135: 154-170. 0277-3791 http://nrs.harvard.edu/urn-3:HUL.InstRepos:23929296 Carl Wunsch Journal Article 2015 ftharvardudash https://doi.org/10.1016/j.quascirev.2016.01.015 2022-04-05T18:34:54Z Pore fluid chlorinity/salinity data from deep-sea cores related to the salinity maximum of the last glacial maximum (LGM) are analyzed using estimation methods deriving from linear control theory. With conventional diffusion coefficient values and no vertical advection, results show a very strong dependence upon initial conditions at -100 ky. Earlier inferences that the abyssal Southern Ocean was strongly salt-stratified in the LGM with a relatively fresh North Atlantic Ocean are found to be consistent within uncertainties of the salinity determination, which remain of order ±1 g/kg. However, an LGM Southern Ocean abyss with an important relative excess of salt is an assumption, one not required by existing core data. None of the present results show statistically significant abyssal salinity values above the global average, and results remain consistent, apart from a general increase owing to diminished sea level, with a more conventional salinity distribution having deep values lower than the global mean. The Southern Ocean core does show a higher salinity than the North Atlantic one on the Bermuda Rise at different water depths. Although much more sophisticated models of the pore-fluid salinity can be used, they will only increase the resulting uncertainties, unless considerably more data can be obtained. Results are consistent with complex regional variations in abyssal salinity during deglaciation, but none are statistically significant. Earth and Planetary Sciences Accepted Manuscript Article in Journal/Newspaper North Atlantic Southern Ocean Harvard University: DASH - Digital Access to Scholarship at Harvard Southern Ocean Quaternary Science Reviews 135 154 170 |
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Open Polar |
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Harvard University: DASH - Digital Access to Scholarship at Harvard |
op_collection_id |
ftharvardudash |
language |
English |
description |
Pore fluid chlorinity/salinity data from deep-sea cores related to the salinity maximum of the last glacial maximum (LGM) are analyzed using estimation methods deriving from linear control theory. With conventional diffusion coefficient values and no vertical advection, results show a very strong dependence upon initial conditions at -100 ky. Earlier inferences that the abyssal Southern Ocean was strongly salt-stratified in the LGM with a relatively fresh North Atlantic Ocean are found to be consistent within uncertainties of the salinity determination, which remain of order ±1 g/kg. However, an LGM Southern Ocean abyss with an important relative excess of salt is an assumption, one not required by existing core data. None of the present results show statistically significant abyssal salinity values above the global average, and results remain consistent, apart from a general increase owing to diminished sea level, with a more conventional salinity distribution having deep values lower than the global mean. The Southern Ocean core does show a higher salinity than the North Atlantic one on the Bermuda Rise at different water depths. Although much more sophisticated models of the pore-fluid salinity can be used, they will only increase the resulting uncertainties, unless considerably more data can be obtained. Results are consistent with complex regional variations in abyssal salinity during deglaciation, but none are statistically significant. Earth and Planetary Sciences Accepted Manuscript |
format |
Article in Journal/Newspaper |
author |
Wunsch, Carl |
spellingShingle |
Wunsch, Carl Pore Fluids and the LGM Ocean Salinity–Reconsidered |
author_facet |
Wunsch, Carl |
author_sort |
Wunsch, Carl |
title |
Pore Fluids and the LGM Ocean Salinity–Reconsidered |
title_short |
Pore Fluids and the LGM Ocean Salinity–Reconsidered |
title_full |
Pore Fluids and the LGM Ocean Salinity–Reconsidered |
title_fullStr |
Pore Fluids and the LGM Ocean Salinity–Reconsidered |
title_full_unstemmed |
Pore Fluids and the LGM Ocean Salinity–Reconsidered |
title_sort |
pore fluids and the lgm ocean salinity–reconsidered |
publisher |
Elsevier |
publishDate |
2015 |
url |
http://nrs.harvard.edu/urn-3:HUL.InstRepos:23929296 https://doi.org/10.1016/j.quascirev.2016.01.015 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_relation |
doi:10.1016/j.quascirev.2016.01.015 Quaternary Science Reviews Quick submit: 2015-12-04T11:10:55-05:00 Wunsch, Carl. 2016. Pore fluids and the LGM ocean salinity - Reconsidered. Quaternary Science Reviews 135: 154-170. 0277-3791 http://nrs.harvard.edu/urn-3:HUL.InstRepos:23929296 |
op_rights |
Carl Wunsch |
op_doi |
https://doi.org/10.1016/j.quascirev.2016.01.015 |
container_title |
Quaternary Science Reviews |
container_volume |
135 |
container_start_page |
154 |
op_container_end_page |
170 |
_version_ |
1766127928231329792 |