Coccolith chemistry reveals secular variations in the global ocean carbon cycle?
International audience The mismatch between the 100 and 400 k.y. components of Pleistocene climate and the relative power of those terms from the eccentricity of the Earth's orbit remains a challenge to the Milankovitch hypothesis. Coccolithophores have the potential to respond to parameters of...
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Online Access: | https://hal.science/hal-01458325 https://doi.org/10.1016/j.epsl.2006.10.016 |
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ftcollegfrance:oai:HAL:hal-01458325v1 2024-06-23T07:56:57+00:00 Coccolith chemistry reveals secular variations in the global ocean carbon cycle? Rickaby, R. E. M. Bard, E. Sonzogni, C. Rostek, F. Beaufort, L. Barker, S. Rees, G. Schrag, D. P. Department of Earth Sciences Oxford University of Oxford Collège de France - Chaire Evolution du climat et de l'océan Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) 2007-01 https://hal.science/hal-01458325 https://doi.org/10.1016/j.epsl.2006.10.016 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2006.10.016 hal-01458325 https://hal.science/hal-01458325 doi:10.1016/j.epsl.2006.10.016 ISSN: 0012-821X Earth and Planetary Science Letters https://hal.science/hal-01458325 Earth and Planetary Science Letters, 2007, 253 (1-2), pp.83-95. ⟨10.1016/j.epsl.2006.10.016⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2007 ftcollegfrance https://doi.org/10.1016/j.epsl.2006.10.016 2024-06-13T23:41:08Z International audience The mismatch between the 100 and 400 k.y. components of Pleistocene climate and the relative power of those terms from the eccentricity of the Earth's orbit remains a challenge to the Milankovitch hypothesis. Coccolithophores have the potential to respond to parameters of orbital forcing other than insolation, and, as a critical component of the ocean carbon cycle, can act to modify the climate response. The first-direct comparison of coccolith fraction Sr/Ca, alkenone abundance and automated coccolithophore counts, shows that CF Sr/Ca is largely driven by changing production of bloom species, with unusually high Sr/Ca ratios. The periods of high CF Sr/Ca and high bloom production mark periods of high global coccolithophore production, which correlate inversely with the low amplitude 100 and higher amplitude 400 k.y. eccentricity orbital frequency similar to 400 k.y. cycles of coccolithophore bloom production correspond to periods of enhanced carbonate accumulation in some parts of the ocean, deep ocean dissolution in others, positive shifts in global ocean delta(13)C, and acmes of Gephyrocapsa caribbeanica and Emiliania huxleyi. The link between production of coccolithophore blooms and eccentricity may be due to orbital control of silica leakage from the Southern Ocean, to the orbitally defined inverse correlation between insolation and growing season length and the asymptotic growth response to these parameters, or to changes in nutrient input from weathering. During the Pleistocene, the eccentricity induced coccolithophore acmes have no apparent influence on atmospheric carbon dioxide (pCO(2)) due to the shift towards small bloom coccolithophores, or to coupling with increased diatom productivity, or the ballast effect of the calcium carbonate rain, such that Pleistocene climate has no significant variance at the largest amplitude eccentricity forcing of 400 k.y. Coccolithophores and their influence on the carbon cycle may act as a filter between the incident orbital forcing and ... Article in Journal/Newspaper Southern Ocean Collège de France: HAL Southern Ocean Earth and Planetary Science Letters 253 1-2 83 95 |
institution |
Open Polar |
collection |
Collège de France: HAL |
op_collection_id |
ftcollegfrance |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Rickaby, R. E. M. Bard, E. Sonzogni, C. Rostek, F. Beaufort, L. Barker, S. Rees, G. Schrag, D. P. Coccolith chemistry reveals secular variations in the global ocean carbon cycle? |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The mismatch between the 100 and 400 k.y. components of Pleistocene climate and the relative power of those terms from the eccentricity of the Earth's orbit remains a challenge to the Milankovitch hypothesis. Coccolithophores have the potential to respond to parameters of orbital forcing other than insolation, and, as a critical component of the ocean carbon cycle, can act to modify the climate response. The first-direct comparison of coccolith fraction Sr/Ca, alkenone abundance and automated coccolithophore counts, shows that CF Sr/Ca is largely driven by changing production of bloom species, with unusually high Sr/Ca ratios. The periods of high CF Sr/Ca and high bloom production mark periods of high global coccolithophore production, which correlate inversely with the low amplitude 100 and higher amplitude 400 k.y. eccentricity orbital frequency similar to 400 k.y. cycles of coccolithophore bloom production correspond to periods of enhanced carbonate accumulation in some parts of the ocean, deep ocean dissolution in others, positive shifts in global ocean delta(13)C, and acmes of Gephyrocapsa caribbeanica and Emiliania huxleyi. The link between production of coccolithophore blooms and eccentricity may be due to orbital control of silica leakage from the Southern Ocean, to the orbitally defined inverse correlation between insolation and growing season length and the asymptotic growth response to these parameters, or to changes in nutrient input from weathering. During the Pleistocene, the eccentricity induced coccolithophore acmes have no apparent influence on atmospheric carbon dioxide (pCO(2)) due to the shift towards small bloom coccolithophores, or to coupling with increased diatom productivity, or the ballast effect of the calcium carbonate rain, such that Pleistocene climate has no significant variance at the largest amplitude eccentricity forcing of 400 k.y. Coccolithophores and their influence on the carbon cycle may act as a filter between the incident orbital forcing and ... |
author2 |
Department of Earth Sciences Oxford University of Oxford Collège de France - Chaire Evolution du climat et de l'océan Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) |
format |
Article in Journal/Newspaper |
author |
Rickaby, R. E. M. Bard, E. Sonzogni, C. Rostek, F. Beaufort, L. Barker, S. Rees, G. Schrag, D. P. |
author_facet |
Rickaby, R. E. M. Bard, E. Sonzogni, C. Rostek, F. Beaufort, L. Barker, S. Rees, G. Schrag, D. P. |
author_sort |
Rickaby, R. E. M. |
title |
Coccolith chemistry reveals secular variations in the global ocean carbon cycle? |
title_short |
Coccolith chemistry reveals secular variations in the global ocean carbon cycle? |
title_full |
Coccolith chemistry reveals secular variations in the global ocean carbon cycle? |
title_fullStr |
Coccolith chemistry reveals secular variations in the global ocean carbon cycle? |
title_full_unstemmed |
Coccolith chemistry reveals secular variations in the global ocean carbon cycle? |
title_sort |
coccolith chemistry reveals secular variations in the global ocean carbon cycle? |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-01458325 https://doi.org/10.1016/j.epsl.2006.10.016 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0012-821X Earth and Planetary Science Letters https://hal.science/hal-01458325 Earth and Planetary Science Letters, 2007, 253 (1-2), pp.83-95. ⟨10.1016/j.epsl.2006.10.016⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2006.10.016 hal-01458325 https://hal.science/hal-01458325 doi:10.1016/j.epsl.2006.10.016 |
op_doi |
https://doi.org/10.1016/j.epsl.2006.10.016 |
container_title |
Earth and Planetary Science Letters |
container_volume |
253 |
container_issue |
1-2 |
container_start_page |
83 |
op_container_end_page |
95 |
_version_ |
1802650350821310464 |