Northern Sourced Water dominated the Atlantic Ocean during the Last Glacial Maximum
Increased carbon sequestration in the ocean subsurface is commonly assumed to have been one of the main causes responsible for lower glacial atmospheric CO2 concentrations. Remineralized carbon must have been stored away from the atmosphere for thousands of years, yet the water mass structure accomm...
Published in: | Geology |
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GSA (Geological Society of America)
2020
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Online Access: | https://oceanrep.geomar.de/id/eprint/49275/ https://oceanrep.geomar.de/id/eprint/49275/1/Poeppelmeier2020_Geology_final.pdf https://oceanrep.geomar.de/id/eprint/49275/2/Poeppelmeier2020_Supplement.pdf https://doi.org/10.1130/G47628.1 |
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ftoceanrep:oai:oceanrep.geomar.de:49275 2023-05-15T17:45:40+02:00 Northern Sourced Water dominated the Atlantic Ocean during the Last Glacial Maximum Pöppelmeier, F. Blaser, P. Gutjahr, Marcus Jaccard, S. L. Frank, Martin Max, L. Lippold, J. 2020-08-01 text https://oceanrep.geomar.de/id/eprint/49275/ https://oceanrep.geomar.de/id/eprint/49275/1/Poeppelmeier2020_Geology_final.pdf https://oceanrep.geomar.de/id/eprint/49275/2/Poeppelmeier2020_Supplement.pdf https://doi.org/10.1130/G47628.1 en eng GSA (Geological Society of America) https://oceanrep.geomar.de/id/eprint/49275/1/Poeppelmeier2020_Geology_final.pdf https://oceanrep.geomar.de/id/eprint/49275/2/Poeppelmeier2020_Supplement.pdf Pöppelmeier, F., Blaser, P., Gutjahr, M. , Jaccard, S. L., Frank, M. , Max, L. and Lippold, J. (2020) Northern Sourced Water dominated the Atlantic Ocean during the Last Glacial Maximum. Open Access Geology, 48 (8). pp. 826-829. DOI 10.1130/G47628.1 <https://doi.org/10.1130/G47628.1>. doi:10.1130/G47628.1 info:eu-repo/semantics/openAccess Article PeerReviewed 2020 ftoceanrep https://doi.org/10.1130/G47628.1 2023-04-07T15:49:58Z Increased carbon sequestration in the ocean subsurface is commonly assumed to have been one of the main causes responsible for lower glacial atmospheric CO2 concentrations. Remineralized carbon must have been stored away from the atmosphere for thousands of years, yet the water mass structure accommodating such increased carbon storage continues to be debated. Here, we present new sediment-derived bottom-water neodymium isotope records that allow fingerprinting of water masses and provide a more complete picture of the Atlantic Meridional Overturning Circulation geometry during the Last Glacial Maximum. These results suggest that the vertical and meridional structure of the Atlantic water mass distribution only experienced minor changes since the last ice age. In particular, we find no compelling evidence supporting glacial southern-sourced water substantially expanding to shallower depths and farther into the Northern Hemisphere than today, which had been previously inferred from stable carbon isotope (δ13C) reconstructions. We argue that depleted δ13C values observed in the deep Northwest Atlantic do not necessarily indicate the presence of southern-sourced water. Instead, these values may represent a northern-sourced water mass with lower than modern preformed δ13C values that were further modified downstream by increased sequestration of remineralized carbon, facilitated by a more sluggish glacial deep circulation, corroborating previous evidence. Article in Journal/Newspaper Northwest Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Geology 48 8 826 829 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Increased carbon sequestration in the ocean subsurface is commonly assumed to have been one of the main causes responsible for lower glacial atmospheric CO2 concentrations. Remineralized carbon must have been stored away from the atmosphere for thousands of years, yet the water mass structure accommodating such increased carbon storage continues to be debated. Here, we present new sediment-derived bottom-water neodymium isotope records that allow fingerprinting of water masses and provide a more complete picture of the Atlantic Meridional Overturning Circulation geometry during the Last Glacial Maximum. These results suggest that the vertical and meridional structure of the Atlantic water mass distribution only experienced minor changes since the last ice age. In particular, we find no compelling evidence supporting glacial southern-sourced water substantially expanding to shallower depths and farther into the Northern Hemisphere than today, which had been previously inferred from stable carbon isotope (δ13C) reconstructions. We argue that depleted δ13C values observed in the deep Northwest Atlantic do not necessarily indicate the presence of southern-sourced water. Instead, these values may represent a northern-sourced water mass with lower than modern preformed δ13C values that were further modified downstream by increased sequestration of remineralized carbon, facilitated by a more sluggish glacial deep circulation, corroborating previous evidence. |
format |
Article in Journal/Newspaper |
author |
Pöppelmeier, F. Blaser, P. Gutjahr, Marcus Jaccard, S. L. Frank, Martin Max, L. Lippold, J. |
spellingShingle |
Pöppelmeier, F. Blaser, P. Gutjahr, Marcus Jaccard, S. L. Frank, Martin Max, L. Lippold, J. Northern Sourced Water dominated the Atlantic Ocean during the Last Glacial Maximum |
author_facet |
Pöppelmeier, F. Blaser, P. Gutjahr, Marcus Jaccard, S. L. Frank, Martin Max, L. Lippold, J. |
author_sort |
Pöppelmeier, F. |
title |
Northern Sourced Water dominated the Atlantic Ocean during the Last Glacial Maximum |
title_short |
Northern Sourced Water dominated the Atlantic Ocean during the Last Glacial Maximum |
title_full |
Northern Sourced Water dominated the Atlantic Ocean during the Last Glacial Maximum |
title_fullStr |
Northern Sourced Water dominated the Atlantic Ocean during the Last Glacial Maximum |
title_full_unstemmed |
Northern Sourced Water dominated the Atlantic Ocean during the Last Glacial Maximum |
title_sort |
northern sourced water dominated the atlantic ocean during the last glacial maximum |
publisher |
GSA (Geological Society of America) |
publishDate |
2020 |
url |
https://oceanrep.geomar.de/id/eprint/49275/ https://oceanrep.geomar.de/id/eprint/49275/1/Poeppelmeier2020_Geology_final.pdf https://oceanrep.geomar.de/id/eprint/49275/2/Poeppelmeier2020_Supplement.pdf https://doi.org/10.1130/G47628.1 |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/49275/1/Poeppelmeier2020_Geology_final.pdf https://oceanrep.geomar.de/id/eprint/49275/2/Poeppelmeier2020_Supplement.pdf Pöppelmeier, F., Blaser, P., Gutjahr, M. , Jaccard, S. L., Frank, M. , Max, L. and Lippold, J. (2020) Northern Sourced Water dominated the Atlantic Ocean during the Last Glacial Maximum. Open Access Geology, 48 (8). pp. 826-829. DOI 10.1130/G47628.1 <https://doi.org/10.1130/G47628.1>. doi:10.1130/G47628.1 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1130/G47628.1 |
container_title |
Geology |
container_volume |
48 |
container_issue |
8 |
container_start_page |
826 |
op_container_end_page |
829 |
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1766148849218355200 |