A lowering effect of reconstructed Holocene changes in sea surface temperatures on the atmospheric CO 2 concentration
One of the mechanisms proposed to explain the roughly 20 ppmv increase in atmospheric CO(2) concentration from the early to late Holocene is a warming of the ocean surface that reduces CO(2) solubility (Indermuhle et al., 1999). Here we show that this hypothesis is not supported by reconstructed cha...
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ftpubman:oai:pure.mpg.de:item_2059851 2023-08-27T04:10:50+02:00 A lowering effect of reconstructed Holocene changes in sea surface temperatures on the atmospheric CO 2 concentration Brovkin, V. Kim, J. Hofmann, M. Schneider, R. 2008 http://hdl.handle.net/11858/00-001M-0000-0023-E5B5-2 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1029/2006GB002885 http://hdl.handle.net/11858/00-001M-0000-0023-E5B5-2 Global Biogeochemical Cycles info:eu-repo/semantics/article 2008 ftpubman https://doi.org/10.1029/2006GB002885 2023-08-02T01:13:09Z One of the mechanisms proposed to explain the roughly 20 ppmv increase in atmospheric CO(2) concentration from the early to late Holocene is a warming of the ocean surface that reduces CO(2) solubility (Indermuhle et al., 1999). Here we show that this hypothesis is not supported by reconstructed changes in sea surface temperatures (SSTs) because of an inhomogeneous distribution of SST changes across the globe during the course of Holocene. While alkenone-based SST reconstructions compiled in the GHOST database (Kim et al., 2004; Kim and Schneider, 2004) suggest a net warming of the surface ocean on a global scale by 0.2 +/- 0.2 degrees C, both data and model results support a significant cooling trend for the North Atlantic during the last 8000 years. In response to the reconstructed cooling of the North Atlantic by 1.1 +/- 0.2 degrees C, a zonally averaged model of oceanic biogeochemistry simulates a drawdown of atmospheric CO2 by 7 +/- 0.8 ppmv, while a reconstructed warming of the Pacific Ocean by 0.6 +/- 0.4 degrees C counterbalances this effect by about 1 ppmv. On a global scale, this model simulates a lowering of atmospheric CO(2) from the Holocene to pre-industrial times by 6 +/- 2 ppmv due to changes in SSTs, while more complex, three-dimensional biogeochemistry model indicates a moderate decrease by 1 ppmv after 300 years of the model integration. Our study suggests that changes in SSTs may have altered atmospheric CO(2) in a direction opposite to the observed trend and that other mechanisms, presumably related to the changes in carbonate chemistry, could be responsible for the CO(2) increase during the Holocene. Article in Journal/Newspaper North Atlantic Max Planck Society: MPG.PuRe Pacific Global Biogeochemical Cycles 22 1 n/a n/a |
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English |
description |
One of the mechanisms proposed to explain the roughly 20 ppmv increase in atmospheric CO(2) concentration from the early to late Holocene is a warming of the ocean surface that reduces CO(2) solubility (Indermuhle et al., 1999). Here we show that this hypothesis is not supported by reconstructed changes in sea surface temperatures (SSTs) because of an inhomogeneous distribution of SST changes across the globe during the course of Holocene. While alkenone-based SST reconstructions compiled in the GHOST database (Kim et al., 2004; Kim and Schneider, 2004) suggest a net warming of the surface ocean on a global scale by 0.2 +/- 0.2 degrees C, both data and model results support a significant cooling trend for the North Atlantic during the last 8000 years. In response to the reconstructed cooling of the North Atlantic by 1.1 +/- 0.2 degrees C, a zonally averaged model of oceanic biogeochemistry simulates a drawdown of atmospheric CO2 by 7 +/- 0.8 ppmv, while a reconstructed warming of the Pacific Ocean by 0.6 +/- 0.4 degrees C counterbalances this effect by about 1 ppmv. On a global scale, this model simulates a lowering of atmospheric CO(2) from the Holocene to pre-industrial times by 6 +/- 2 ppmv due to changes in SSTs, while more complex, three-dimensional biogeochemistry model indicates a moderate decrease by 1 ppmv after 300 years of the model integration. Our study suggests that changes in SSTs may have altered atmospheric CO(2) in a direction opposite to the observed trend and that other mechanisms, presumably related to the changes in carbonate chemistry, could be responsible for the CO(2) increase during the Holocene. |
format |
Article in Journal/Newspaper |
author |
Brovkin, V. Kim, J. Hofmann, M. Schneider, R. |
spellingShingle |
Brovkin, V. Kim, J. Hofmann, M. Schneider, R. A lowering effect of reconstructed Holocene changes in sea surface temperatures on the atmospheric CO 2 concentration |
author_facet |
Brovkin, V. Kim, J. Hofmann, M. Schneider, R. |
author_sort |
Brovkin, V. |
title |
A lowering effect of reconstructed Holocene changes in sea surface temperatures on the atmospheric CO 2 concentration |
title_short |
A lowering effect of reconstructed Holocene changes in sea surface temperatures on the atmospheric CO 2 concentration |
title_full |
A lowering effect of reconstructed Holocene changes in sea surface temperatures on the atmospheric CO 2 concentration |
title_fullStr |
A lowering effect of reconstructed Holocene changes in sea surface temperatures on the atmospheric CO 2 concentration |
title_full_unstemmed |
A lowering effect of reconstructed Holocene changes in sea surface temperatures on the atmospheric CO 2 concentration |
title_sort |
lowering effect of reconstructed holocene changes in sea surface temperatures on the atmospheric co 2 concentration |
publishDate |
2008 |
url |
http://hdl.handle.net/11858/00-001M-0000-0023-E5B5-2 |
geographic |
Pacific |
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Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Global Biogeochemical Cycles |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2006GB002885 http://hdl.handle.net/11858/00-001M-0000-0023-E5B5-2 |
op_doi |
https://doi.org/10.1029/2006GB002885 |
container_title |
Global Biogeochemical Cycles |
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22 |
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1 |
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1775353161130704896 |