Similar glacial and interglacial export bioproductivity in the Atlantic sector of the Southern Ocean: Multiproxy evidence and implications for atmospheric CO2
We present time series of export productivity proxy data including 230Thex-normalized deposition rates (rain rates) of 10Be, dissolution-corrected biogenic Ba, and biogenic opal as well as authigenic U concentrations which are complemented by rain rates of total (detrital) Fe and sea ice indicating...
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AGU (American Geophysical Union)
2000
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Online Access: | https://oceanrep.geomar.de/id/eprint/6256/ https://oceanrep.geomar.de/id/eprint/6256/1/Frank%20et.al.pdf https://doi.org/10.1029/2000PA000497 |
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ftoceanrep:oai:oceanrep.geomar.de:6256 2023-05-15T13:40:55+02:00 Similar glacial and interglacial export bioproductivity in the Atlantic sector of the Southern Ocean: Multiproxy evidence and implications for atmospheric CO2 Frank, Martin Gersonde, R. Rutgers van der Loeff, M. Bohrmann, Gerhard Nürnberg, Christine C. Kubik, P. W. Suter, M. Mangini, A. 2000 text https://oceanrep.geomar.de/id/eprint/6256/ https://oceanrep.geomar.de/id/eprint/6256/1/Frank%20et.al.pdf https://doi.org/10.1029/2000PA000497 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/6256/1/Frank%20et.al.pdf Frank, M. , Gersonde, R., Rutgers van der Loeff, M., Bohrmann, G., Nürnberg, C. C., Kubik, P. W., Suter, M. and Mangini, A. (2000) Similar glacial and interglacial export bioproductivity in the Atlantic sector of the Southern Ocean: Multiproxy evidence and implications for atmospheric CO2. Open Access Paleoceanography, 15 . pp. 642-658. DOI 10.1029/2000PA000497 <https://doi.org/10.1029/2000PA000497>. doi:10.1029/2000PA000497 info:eu-repo/semantics/openAccess Article PeerReviewed 2000 ftoceanrep https://doi.org/10.1029/2000PA000497 2023-04-07T14:52:35Z We present time series of export productivity proxy data including 230Thex-normalized deposition rates (rain rates) of 10Be, dissolution-corrected biogenic Ba, and biogenic opal as well as authigenic U concentrations which are complemented by rain rates of total (detrital) Fe and sea ice indicating diatom abundances from five sediment cores across the Atlantic sector of the Southern Ocean covering the past 150,000 years. The results suggest that 10Be rain rates and authigenic U concentration cannot serve as quantitative paleoproductivity proxies because they have also been influenced by detrital particle fluxes in the case of 10Be and bulk sedimentation rates (sediment focussing) and deep water oxygenation in the case of U. The combined results of the remaining productivity proxies of this study (rain rates of biogenic opal and biogenic Ba in those sections without authigenic U) and other previously published proxy data from the Southern Ocean (231Pa/230Th and nitrogen isotopes) suggest that a combination of sea ice cover, shallow remineralization depth, and stratification of the glacial water column south of the present position of the Antarctic Polar Front and possibly Fe fertilization north of it have been the main controlling factors of export paleoproductivity in the Southern Ocean over the last 150,000 years. An overall glacial increase of export paleoproductivity is not supported by the data, implying that bioproductivity variations in the Southern Ocean are unlikely to have contributed to the major glacial atmospheric CO2 drawdown observed in ice cores. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Southern Ocean The Antarctic Paleoceanography 15 6 642 658 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
We present time series of export productivity proxy data including 230Thex-normalized deposition rates (rain rates) of 10Be, dissolution-corrected biogenic Ba, and biogenic opal as well as authigenic U concentrations which are complemented by rain rates of total (detrital) Fe and sea ice indicating diatom abundances from five sediment cores across the Atlantic sector of the Southern Ocean covering the past 150,000 years. The results suggest that 10Be rain rates and authigenic U concentration cannot serve as quantitative paleoproductivity proxies because they have also been influenced by detrital particle fluxes in the case of 10Be and bulk sedimentation rates (sediment focussing) and deep water oxygenation in the case of U. The combined results of the remaining productivity proxies of this study (rain rates of biogenic opal and biogenic Ba in those sections without authigenic U) and other previously published proxy data from the Southern Ocean (231Pa/230Th and nitrogen isotopes) suggest that a combination of sea ice cover, shallow remineralization depth, and stratification of the glacial water column south of the present position of the Antarctic Polar Front and possibly Fe fertilization north of it have been the main controlling factors of export paleoproductivity in the Southern Ocean over the last 150,000 years. An overall glacial increase of export paleoproductivity is not supported by the data, implying that bioproductivity variations in the Southern Ocean are unlikely to have contributed to the major glacial atmospheric CO2 drawdown observed in ice cores. |
format |
Article in Journal/Newspaper |
author |
Frank, Martin Gersonde, R. Rutgers van der Loeff, M. Bohrmann, Gerhard Nürnberg, Christine C. Kubik, P. W. Suter, M. Mangini, A. |
spellingShingle |
Frank, Martin Gersonde, R. Rutgers van der Loeff, M. Bohrmann, Gerhard Nürnberg, Christine C. Kubik, P. W. Suter, M. Mangini, A. Similar glacial and interglacial export bioproductivity in the Atlantic sector of the Southern Ocean: Multiproxy evidence and implications for atmospheric CO2 |
author_facet |
Frank, Martin Gersonde, R. Rutgers van der Loeff, M. Bohrmann, Gerhard Nürnberg, Christine C. Kubik, P. W. Suter, M. Mangini, A. |
author_sort |
Frank, Martin |
title |
Similar glacial and interglacial export bioproductivity in the Atlantic sector of the Southern Ocean: Multiproxy evidence and implications for atmospheric CO2 |
title_short |
Similar glacial and interglacial export bioproductivity in the Atlantic sector of the Southern Ocean: Multiproxy evidence and implications for atmospheric CO2 |
title_full |
Similar glacial and interglacial export bioproductivity in the Atlantic sector of the Southern Ocean: Multiproxy evidence and implications for atmospheric CO2 |
title_fullStr |
Similar glacial and interglacial export bioproductivity in the Atlantic sector of the Southern Ocean: Multiproxy evidence and implications for atmospheric CO2 |
title_full_unstemmed |
Similar glacial and interglacial export bioproductivity in the Atlantic sector of the Southern Ocean: Multiproxy evidence and implications for atmospheric CO2 |
title_sort |
similar glacial and interglacial export bioproductivity in the atlantic sector of the southern ocean: multiproxy evidence and implications for atmospheric co2 |
publisher |
AGU (American Geophysical Union) |
publishDate |
2000 |
url |
https://oceanrep.geomar.de/id/eprint/6256/ https://oceanrep.geomar.de/id/eprint/6256/1/Frank%20et.al.pdf https://doi.org/10.1029/2000PA000497 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_relation |
https://oceanrep.geomar.de/id/eprint/6256/1/Frank%20et.al.pdf Frank, M. , Gersonde, R., Rutgers van der Loeff, M., Bohrmann, G., Nürnberg, C. C., Kubik, P. W., Suter, M. and Mangini, A. (2000) Similar glacial and interglacial export bioproductivity in the Atlantic sector of the Southern Ocean: Multiproxy evidence and implications for atmospheric CO2. Open Access Paleoceanography, 15 . pp. 642-658. DOI 10.1029/2000PA000497 <https://doi.org/10.1029/2000PA000497>. doi:10.1029/2000PA000497 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2000PA000497 |
container_title |
Paleoceanography |
container_volume |
15 |
container_issue |
6 |
container_start_page |
642 |
op_container_end_page |
658 |
_version_ |
1766143367558725632 |