Glacial pCO2 reduction by the world ocean: experiments with the Hamburg Carbon Cycle Model
Possible mechanisms for the 80 ppm reduction of atmospheric CO2 partial pressure during the last glaciation were investigated using the Hamburg Ocean Carbon Cycle Model. The three-dimensional carbon cycle model is based on the velocity field of the Hamburg Large-Scale Geostrophic Ocean General Circu...
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ftpubman:oai:pure.mpg.de:item_2556410 2023-08-27T04:10:00+02:00 Glacial pCO2 reduction by the world ocean: experiments with the Hamburg Carbon Cycle Model Heinze, C. Maier-Reimer, E. Winn, K. 1991 application/pdf http://hdl.handle.net/21.11116/0000-0000-C967-A http://hdl.handle.net/21.11116/0000-0000-C969-8 http://hdl.handle.net/21.11116/0000-0000-C96A-7 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1029/91PA00489 http://hdl.handle.net/21.11116/0000-0000-C967-A http://hdl.handle.net/21.11116/0000-0000-C969-8 http://hdl.handle.net/21.11116/0000-0000-C96A-7 info:eu-repo/semantics/openAccess Paleoceanography Report / Max-Planck-Institut für Meteorologie info:eu-repo/semantics/article 1991 ftpubman https://doi.org/10.1029/91PA00489 2023-08-02T00:56:18Z Possible mechanisms for the 80 ppm reduction of atmospheric CO2 partial pressure during the last glaciation were investigated using the Hamburg Ocean Carbon Cycle Model. The three-dimensional carbon cycle model is based on the velocity field of the Hamburg Large-Scale Geostrophic Ocean General Circulation Model and uses the same grid as that model. The horizontal resolution (3.5 degrees x 3.5 degrees) is lower than the length scale of narrow upwelling belts which could not be represented adequately in this study, but the large-scale features of the ocean carbon cycle are reproduced rather well. Sensitivity experiments were carried out to investigate the role of chemical and biological parameters (nutrient cycling, composition of bio-genic particulate matter, CO2 solubility) and different circulation regimes for the atmospheric CO2 content. The model responses were compared to deep-sea sediment core records and ice core data from the last glaciation. Each experiment was compared with observed average tracer patterns during 18-65 kyr B. P. It was found that none of the sensitivity experiments alone could explain all observed tracer changes(atmospheric pCO(2), Delta delta C-13(planktonic-benthic), delta C-13(benthic) differences, CaCO3 corrosivity indices) simultaneously, even in a qualitative sense. Thus according to the model none of the scenarios tested proves to be completely acceptable. The residual discrepancies between the observed and modeled tracer records can probably be attributed to the as yet inadequate reconstruction of the glacial ocean circulation. It is therefore suggested that more effort should be devoted to realistically reproducing the ice age ocean circulation field making use of the forthcoming glacial radiocarbon data base. The residuals between the realistically modeled and observed carbon cycle tracers (delta C-13, CaCO3 saturation) should then reveal more clearly the real cause for the observed pCO(2) decrease in the glacial atmosphere. Article in Journal/Newspaper ice core Max Planck Society: MPG.PuRe Paleoceanography 6 4 395 430 |
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Max Planck Society: MPG.PuRe |
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ftpubman |
language |
English |
description |
Possible mechanisms for the 80 ppm reduction of atmospheric CO2 partial pressure during the last glaciation were investigated using the Hamburg Ocean Carbon Cycle Model. The three-dimensional carbon cycle model is based on the velocity field of the Hamburg Large-Scale Geostrophic Ocean General Circulation Model and uses the same grid as that model. The horizontal resolution (3.5 degrees x 3.5 degrees) is lower than the length scale of narrow upwelling belts which could not be represented adequately in this study, but the large-scale features of the ocean carbon cycle are reproduced rather well. Sensitivity experiments were carried out to investigate the role of chemical and biological parameters (nutrient cycling, composition of bio-genic particulate matter, CO2 solubility) and different circulation regimes for the atmospheric CO2 content. The model responses were compared to deep-sea sediment core records and ice core data from the last glaciation. Each experiment was compared with observed average tracer patterns during 18-65 kyr B. P. It was found that none of the sensitivity experiments alone could explain all observed tracer changes(atmospheric pCO(2), Delta delta C-13(planktonic-benthic), delta C-13(benthic) differences, CaCO3 corrosivity indices) simultaneously, even in a qualitative sense. Thus according to the model none of the scenarios tested proves to be completely acceptable. The residual discrepancies between the observed and modeled tracer records can probably be attributed to the as yet inadequate reconstruction of the glacial ocean circulation. It is therefore suggested that more effort should be devoted to realistically reproducing the ice age ocean circulation field making use of the forthcoming glacial radiocarbon data base. The residuals between the realistically modeled and observed carbon cycle tracers (delta C-13, CaCO3 saturation) should then reveal more clearly the real cause for the observed pCO(2) decrease in the glacial atmosphere. |
format |
Article in Journal/Newspaper |
author |
Heinze, C. Maier-Reimer, E. Winn, K. |
spellingShingle |
Heinze, C. Maier-Reimer, E. Winn, K. Glacial pCO2 reduction by the world ocean: experiments with the Hamburg Carbon Cycle Model |
author_facet |
Heinze, C. Maier-Reimer, E. Winn, K. |
author_sort |
Heinze, C. |
title |
Glacial pCO2 reduction by the world ocean: experiments with the Hamburg Carbon Cycle Model |
title_short |
Glacial pCO2 reduction by the world ocean: experiments with the Hamburg Carbon Cycle Model |
title_full |
Glacial pCO2 reduction by the world ocean: experiments with the Hamburg Carbon Cycle Model |
title_fullStr |
Glacial pCO2 reduction by the world ocean: experiments with the Hamburg Carbon Cycle Model |
title_full_unstemmed |
Glacial pCO2 reduction by the world ocean: experiments with the Hamburg Carbon Cycle Model |
title_sort |
glacial pco2 reduction by the world ocean: experiments with the hamburg carbon cycle model |
publishDate |
1991 |
url |
http://hdl.handle.net/21.11116/0000-0000-C967-A http://hdl.handle.net/21.11116/0000-0000-C969-8 http://hdl.handle.net/21.11116/0000-0000-C96A-7 |
genre |
ice core |
genre_facet |
ice core |
op_source |
Paleoceanography Report / Max-Planck-Institut für Meteorologie |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/91PA00489 http://hdl.handle.net/21.11116/0000-0000-C967-A http://hdl.handle.net/21.11116/0000-0000-C969-8 http://hdl.handle.net/21.11116/0000-0000-C96A-7 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/91PA00489 |
container_title |
Paleoceanography |
container_volume |
6 |
container_issue |
4 |
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395 |
op_container_end_page |
430 |
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1775351711409373184 |