Data constraints on glacial Atlantic Water mass geometry and properties
© The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Paleoceanography and Paleoclimatology 33 (2018): 1013-1034, doi:10.1029/2018PA003408. The chemical composition of benthic foraminifera from marine s...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/10674 2023-05-15T13:48:31+02:00 Data constraints on glacial Atlantic Water mass geometry and properties Oppo, Delia W. Gebbie, Geoffrey A. Huang, Kuo-Fang Curry, William B. Marchitto, Thomas M. Pietro, Kathryn R. 2018-09-27 https://hdl.handle.net/1912/10674 en_US eng John Wiley & Sons https://doi.org/10.1029/2018PA003408 Paleoceanography and Paleoclimatology 33 (2018): 1013-1034 https://hdl.handle.net/1912/10674 doi:10.1029/2018PA003408 Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ CC-BY-NC-ND Paleoceanography and Paleoclimatology 33 (2018): 1013-1034 doi:10.1029/2018PA003408 Glacial Atlantic circulation Preformed phosphate Remineralized phosphate Antarctic Intermediate Water Nutrient redistribution Tropical phosphate maximum Article 2018 ftwhoas https://doi.org/10.1029/2018PA003408 2022-05-28T23:00:30Z © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Paleoceanography and Paleoclimatology 33 (2018): 1013-1034, doi:10.1029/2018PA003408. The chemical composition of benthic foraminifera from marine sediment cores provides information on how glacial subsurface water properties differed from modern, but separating the influence of changes in the origin and end‐member properties of subsurface water from changes in flows and mixing is challenging. Spatial gaps in coverage of glacial data add to the uncertainty. Here we present new data from cores collected from the Demerara Rise in the western tropical North Atlantic, including cores from the modern tropical phosphate maximum at Antarctic Intermediate Water (AAIW) depths. The results suggest lower phosphate concentration and higher carbonate saturation state within the phosphate maximum than modern despite similar carbon isotope values, consistent with less accumulation of respired nutrients and carbon, and reduced air‐sea gas exchange in source waters to the region. An inversion of new and published glacial data confirms these inferences and further suggests that lower preformed nutrients in AAIW, and partial replacement of this still relatively high‐nutrient AAIW with nutrient‐depleted, carbonate‐rich waters sourced from the region of the modern‐day northern subtropics, also contributed to the observed changes. The results suggest that glacial preformed and remineralized phosphate were lower throughout the upper Atlantic, but deep phosphate concentration was higher. The inversion, which relies on the fidelity of the paleoceanographic data, suggests that the partial replacement of North Atlantic sourced deep water by Southern Ocean Water was largely responsible for the apparent deep North Atlantic phosphate increase, rather than greater remineralization. National Science Foundation (NSF) Grant Numbers: OCE‐0750880, OCE‐1335191, OCE‐1558341, OCE‐1536380; Woods ... Article in Journal/Newspaper Antarc* Antarctic North Atlantic Southern Ocean Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic Southern Ocean Paleoceanography and Paleoclimatology 33 9 1013 1034 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Glacial Atlantic circulation Preformed phosphate Remineralized phosphate Antarctic Intermediate Water Nutrient redistribution Tropical phosphate maximum |
spellingShingle |
Glacial Atlantic circulation Preformed phosphate Remineralized phosphate Antarctic Intermediate Water Nutrient redistribution Tropical phosphate maximum Oppo, Delia W. Gebbie, Geoffrey A. Huang, Kuo-Fang Curry, William B. Marchitto, Thomas M. Pietro, Kathryn R. Data constraints on glacial Atlantic Water mass geometry and properties |
topic_facet |
Glacial Atlantic circulation Preformed phosphate Remineralized phosphate Antarctic Intermediate Water Nutrient redistribution Tropical phosphate maximum |
description |
© The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Paleoceanography and Paleoclimatology 33 (2018): 1013-1034, doi:10.1029/2018PA003408. The chemical composition of benthic foraminifera from marine sediment cores provides information on how glacial subsurface water properties differed from modern, but separating the influence of changes in the origin and end‐member properties of subsurface water from changes in flows and mixing is challenging. Spatial gaps in coverage of glacial data add to the uncertainty. Here we present new data from cores collected from the Demerara Rise in the western tropical North Atlantic, including cores from the modern tropical phosphate maximum at Antarctic Intermediate Water (AAIW) depths. The results suggest lower phosphate concentration and higher carbonate saturation state within the phosphate maximum than modern despite similar carbon isotope values, consistent with less accumulation of respired nutrients and carbon, and reduced air‐sea gas exchange in source waters to the region. An inversion of new and published glacial data confirms these inferences and further suggests that lower preformed nutrients in AAIW, and partial replacement of this still relatively high‐nutrient AAIW with nutrient‐depleted, carbonate‐rich waters sourced from the region of the modern‐day northern subtropics, also contributed to the observed changes. The results suggest that glacial preformed and remineralized phosphate were lower throughout the upper Atlantic, but deep phosphate concentration was higher. The inversion, which relies on the fidelity of the paleoceanographic data, suggests that the partial replacement of North Atlantic sourced deep water by Southern Ocean Water was largely responsible for the apparent deep North Atlantic phosphate increase, rather than greater remineralization. National Science Foundation (NSF) Grant Numbers: OCE‐0750880, OCE‐1335191, OCE‐1558341, OCE‐1536380; Woods ... |
format |
Article in Journal/Newspaper |
author |
Oppo, Delia W. Gebbie, Geoffrey A. Huang, Kuo-Fang Curry, William B. Marchitto, Thomas M. Pietro, Kathryn R. |
author_facet |
Oppo, Delia W. Gebbie, Geoffrey A. Huang, Kuo-Fang Curry, William B. Marchitto, Thomas M. Pietro, Kathryn R. |
author_sort |
Oppo, Delia W. |
title |
Data constraints on glacial Atlantic Water mass geometry and properties |
title_short |
Data constraints on glacial Atlantic Water mass geometry and properties |
title_full |
Data constraints on glacial Atlantic Water mass geometry and properties |
title_fullStr |
Data constraints on glacial Atlantic Water mass geometry and properties |
title_full_unstemmed |
Data constraints on glacial Atlantic Water mass geometry and properties |
title_sort |
data constraints on glacial atlantic water mass geometry and properties |
publisher |
John Wiley & Sons |
publishDate |
2018 |
url |
https://hdl.handle.net/1912/10674 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic North Atlantic Southern Ocean |
op_source |
Paleoceanography and Paleoclimatology 33 (2018): 1013-1034 doi:10.1029/2018PA003408 |
op_relation |
https://doi.org/10.1029/2018PA003408 Paleoceanography and Paleoclimatology 33 (2018): 1013-1034 https://hdl.handle.net/1912/10674 doi:10.1029/2018PA003408 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1029/2018PA003408 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
33 |
container_issue |
9 |
container_start_page |
1013 |
op_container_end_page |
1034 |
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1766249351234977792 |