Global variations of surface ocean productivity in low and mid latitudes: Influence on CO2 reservoirs of the deep ocean and atmosphere during the last 21,000 years
Based on detailed reconstructions of global distribution patterns, both paleoproductivity and the benthic δ13C record of CO2, which is dissolved in the deep ocean, strongly differed between the Last Glacial Maximum and the Holocene. With the onset of Termination I about 15,000 years ago, the new (ex...
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AGU (American Geophysical Union)
1988
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ftoceanrep:oai:oceanrep.geomar.de:33627 2023-05-15T18:18:29+02:00 Global variations of surface ocean productivity in low and mid latitudes: Influence on CO2 reservoirs of the deep ocean and atmosphere during the last 21,000 years Sarntheim, Michael Winn, Kyaw Duplessy, Jean-Claude Fontugne, Michael R. 1988 text https://oceanrep.geomar.de/id/eprint/33627/ https://oceanrep.geomar.de/id/eprint/33627/1/Sarnthein.pdf https://doi.org/10.1029/PA003i003p00361 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/33627/1/Sarnthein.pdf Sarntheim, M., Winn, K., Duplessy, J. C. and Fontugne, M. R. (1988) Global variations of surface ocean productivity in low and mid latitudes: Influence on CO2 reservoirs of the deep ocean and atmosphere during the last 21,000 years. Paleoceanography, 3 (3). pp. 361-399. DOI 10.1029/PA003i003p00361 <https://doi.org/10.1029/PA003i003p00361>. doi:10.1029/PA003i003p00361 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 1988 ftoceanrep https://doi.org/10.1029/PA003i003p00361 2023-04-07T15:27:11Z Based on detailed reconstructions of global distribution patterns, both paleoproductivity and the benthic δ13C record of CO2, which is dissolved in the deep ocean, strongly differed between the Last Glacial Maximum and the Holocene. With the onset of Termination I about 15,000 years ago, the new (export) production of low- and mid-latitude upwelling cells started to decline by more than 2-4 Gt carbon/year. This reduction is regarded as a main factor leading to both the simultaneous rise in atmospheric CO2 as recorded in ice cores and, with a slight delay of more than 1000 years, to a large-scale gradual CO2 depletion of the deep ocean by about 650 Gt C. This estimate is based on an average increase in benthic δ13C by 0.4–0.5‰. The decrease in new production also matches a clear 13C depletion of organic matter, possibly recording an end of extreme nutrient utilization in upwelling cells. As shown by Sarnthein et al., [1987], the productivity reversal appears to be triggered by a rapid reduction in the strength of meridional trades, which in turn was linked via a shrinking extent of sea ice to a massive increase in high-latitude insolation, i.e., to orbital forcing as primary cause. Article in Journal/Newspaper Sea ice OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Paleoceanography 3 3 361 399 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Based on detailed reconstructions of global distribution patterns, both paleoproductivity and the benthic δ13C record of CO2, which is dissolved in the deep ocean, strongly differed between the Last Glacial Maximum and the Holocene. With the onset of Termination I about 15,000 years ago, the new (export) production of low- and mid-latitude upwelling cells started to decline by more than 2-4 Gt carbon/year. This reduction is regarded as a main factor leading to both the simultaneous rise in atmospheric CO2 as recorded in ice cores and, with a slight delay of more than 1000 years, to a large-scale gradual CO2 depletion of the deep ocean by about 650 Gt C. This estimate is based on an average increase in benthic δ13C by 0.4–0.5‰. The decrease in new production also matches a clear 13C depletion of organic matter, possibly recording an end of extreme nutrient utilization in upwelling cells. As shown by Sarnthein et al., [1987], the productivity reversal appears to be triggered by a rapid reduction in the strength of meridional trades, which in turn was linked via a shrinking extent of sea ice to a massive increase in high-latitude insolation, i.e., to orbital forcing as primary cause. |
format |
Article in Journal/Newspaper |
author |
Sarntheim, Michael Winn, Kyaw Duplessy, Jean-Claude Fontugne, Michael R. |
spellingShingle |
Sarntheim, Michael Winn, Kyaw Duplessy, Jean-Claude Fontugne, Michael R. Global variations of surface ocean productivity in low and mid latitudes: Influence on CO2 reservoirs of the deep ocean and atmosphere during the last 21,000 years |
author_facet |
Sarntheim, Michael Winn, Kyaw Duplessy, Jean-Claude Fontugne, Michael R. |
author_sort |
Sarntheim, Michael |
title |
Global variations of surface ocean productivity in low and mid latitudes: Influence on CO2 reservoirs of the deep ocean and atmosphere during the last 21,000 years |
title_short |
Global variations of surface ocean productivity in low and mid latitudes: Influence on CO2 reservoirs of the deep ocean and atmosphere during the last 21,000 years |
title_full |
Global variations of surface ocean productivity in low and mid latitudes: Influence on CO2 reservoirs of the deep ocean and atmosphere during the last 21,000 years |
title_fullStr |
Global variations of surface ocean productivity in low and mid latitudes: Influence on CO2 reservoirs of the deep ocean and atmosphere during the last 21,000 years |
title_full_unstemmed |
Global variations of surface ocean productivity in low and mid latitudes: Influence on CO2 reservoirs of the deep ocean and atmosphere during the last 21,000 years |
title_sort |
global variations of surface ocean productivity in low and mid latitudes: influence on co2 reservoirs of the deep ocean and atmosphere during the last 21,000 years |
publisher |
AGU (American Geophysical Union) |
publishDate |
1988 |
url |
https://oceanrep.geomar.de/id/eprint/33627/ https://oceanrep.geomar.de/id/eprint/33627/1/Sarnthein.pdf https://doi.org/10.1029/PA003i003p00361 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
https://oceanrep.geomar.de/id/eprint/33627/1/Sarnthein.pdf Sarntheim, M., Winn, K., Duplessy, J. C. and Fontugne, M. R. (1988) Global variations of surface ocean productivity in low and mid latitudes: Influence on CO2 reservoirs of the deep ocean and atmosphere during the last 21,000 years. Paleoceanography, 3 (3). pp. 361-399. DOI 10.1029/PA003i003p00361 <https://doi.org/10.1029/PA003i003p00361>. doi:10.1029/PA003i003p00361 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1029/PA003i003p00361 |
container_title |
Paleoceanography |
container_volume |
3 |
container_issue |
3 |
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361 |
op_container_end_page |
399 |
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1766195068202385408 |