Ocean carbon cycling during the past 130 000 years – a pilot study on inverse palaeoclimate record modelling
What role did changes in marine carbon cycle processes and calcareous organisms play in glacial–interglacial variation in atmospheric p CO 2 ? In order to answer this question, we explore results from an ocean biogeochemical general circulation model. We attempt to systematically reconcile model res...
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ftdoajarticles:oai:doaj.org/article:90a0cb8fcdaf441fb525f4cab20a0567 2023-05-15T17:51:49+02:00 Ocean carbon cycling during the past 130 000 years – a pilot study on inverse palaeoclimate record modelling C. Heinze B. A. A. Hoogakker A. Winguth 2016-10-01T00:00:00Z https://doi.org/10.5194/cp-12-1949-2016 https://doaj.org/article/90a0cb8fcdaf441fb525f4cab20a0567 EN eng Copernicus Publications http://www.clim-past.net/12/1949/2016/cp-12-1949-2016.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-12-1949-2016 https://doaj.org/article/90a0cb8fcdaf441fb525f4cab20a0567 Climate of the Past, Vol 12, Iss 10, Pp 1949-1978 (2016) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2016 ftdoajarticles https://doi.org/10.5194/cp-12-1949-2016 2022-12-31T14:42:16Z What role did changes in marine carbon cycle processes and calcareous organisms play in glacial–interglacial variation in atmospheric p CO 2 ? In order to answer this question, we explore results from an ocean biogeochemical general circulation model. We attempt to systematically reconcile model results with time-dependent sediment core data from the observations. For this purpose, we fit simulated sensitivities of oceanic tracer concentrations to changes in governing carbon cycle parameters to measured sediment core data. We assume that the time variation in the governing carbon cycle parameters follows the general pattern of the glacial–interglacial deuterium anomaly. Our analysis provides an independent estimate of a maximum mean sea surface temperature drawdown of about 5 °C and a maximum outgassing of the land biosphere by about 430 Pg C at the Last Glacial Maximum as compared to pre-industrial times. The overall fit of modelled palaeoclimate tracers to observations, however, remains quite weak, indicating the potential of more detailed modelling studies to fully exploit the information stored in the palaeoclimatic archive. This study confirms the hypothesis that a decline in ocean temperature and a more efficient biological carbon pump in combination with changes in ocean circulation are the key factors for explaining the glacial CO 2 drawdown. The analysis suggests that potential changes in the export rain ratio POC : CaCO 3 may not have a substantial imprint on the palaeoclimatic archive. The use of the last glacial as an inverted analogue to potential ocean acidification impacts thus may be quite limited. A strong decrease in CaCO 3 export production could potentially contribute to the glacial CO 2 decline in the atmosphere, but this remains hypothetical. Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Climate of the Past 12 10 1949 1978 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 C. Heinze B. A. A. Hoogakker A. Winguth Ocean carbon cycling during the past 130 000 years – a pilot study on inverse palaeoclimate record modelling |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
What role did changes in marine carbon cycle processes and calcareous organisms play in glacial–interglacial variation in atmospheric p CO 2 ? In order to answer this question, we explore results from an ocean biogeochemical general circulation model. We attempt to systematically reconcile model results with time-dependent sediment core data from the observations. For this purpose, we fit simulated sensitivities of oceanic tracer concentrations to changes in governing carbon cycle parameters to measured sediment core data. We assume that the time variation in the governing carbon cycle parameters follows the general pattern of the glacial–interglacial deuterium anomaly. Our analysis provides an independent estimate of a maximum mean sea surface temperature drawdown of about 5 °C and a maximum outgassing of the land biosphere by about 430 Pg C at the Last Glacial Maximum as compared to pre-industrial times. The overall fit of modelled palaeoclimate tracers to observations, however, remains quite weak, indicating the potential of more detailed modelling studies to fully exploit the information stored in the palaeoclimatic archive. This study confirms the hypothesis that a decline in ocean temperature and a more efficient biological carbon pump in combination with changes in ocean circulation are the key factors for explaining the glacial CO 2 drawdown. The analysis suggests that potential changes in the export rain ratio POC : CaCO 3 may not have a substantial imprint on the palaeoclimatic archive. The use of the last glacial as an inverted analogue to potential ocean acidification impacts thus may be quite limited. A strong decrease in CaCO 3 export production could potentially contribute to the glacial CO 2 decline in the atmosphere, but this remains hypothetical. |
format |
Article in Journal/Newspaper |
author |
C. Heinze B. A. A. Hoogakker A. Winguth |
author_facet |
C. Heinze B. A. A. Hoogakker A. Winguth |
author_sort |
C. Heinze |
title |
Ocean carbon cycling during the past 130 000 years – a pilot study on inverse palaeoclimate record modelling |
title_short |
Ocean carbon cycling during the past 130 000 years – a pilot study on inverse palaeoclimate record modelling |
title_full |
Ocean carbon cycling during the past 130 000 years – a pilot study on inverse palaeoclimate record modelling |
title_fullStr |
Ocean carbon cycling during the past 130 000 years – a pilot study on inverse palaeoclimate record modelling |
title_full_unstemmed |
Ocean carbon cycling during the past 130 000 years – a pilot study on inverse palaeoclimate record modelling |
title_sort |
ocean carbon cycling during the past 130 000 years – a pilot study on inverse palaeoclimate record modelling |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/cp-12-1949-2016 https://doaj.org/article/90a0cb8fcdaf441fb525f4cab20a0567 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Climate of the Past, Vol 12, Iss 10, Pp 1949-1978 (2016) |
op_relation |
http://www.clim-past.net/12/1949/2016/cp-12-1949-2016.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-12-1949-2016 https://doaj.org/article/90a0cb8fcdaf441fb525f4cab20a0567 |
op_doi |
https://doi.org/10.5194/cp-12-1949-2016 |
container_title |
Climate of the Past |
container_volume |
12 |
container_issue |
10 |
container_start_page |
1949 |
op_container_end_page |
1978 |
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1766159077458575360 |