Temperature-dependent remineralization and carbon cycling in the warm Eocene oceans
Metabolic rates in heterotrophic bacteria are more sensitive to temperature than rates of primary production (e.g., López-Urrutia et al., 2006; Regaudie-de-Gioux and Duarte, 2012). Consequently, faster bacterial respiration rates in a warmer ocean may result in more efficient remineralization of sin...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:69537 2023-05-15T18:01:01+02:00 Temperature-dependent remineralization and carbon cycling in the warm Eocene oceans John, Eleanor H. Wilson, Jamie D. Pearson, Paul Nicholas Ridgwell, Andy 2014-11-01 https://orca.cardiff.ac.uk/id/eprint/69537/ https://doi.org/10.1016/j.palaeo.2014.05.019 unknown Elsevier John, Eleanor H. https://orca.cardiff.ac.uk/view/cardiffauthors/A2909665.html, Wilson, Jamie D. https://orca.cardiff.ac.uk/view/cardiffauthors/A249157H.html, Pearson, Paul Nicholas https://orca.cardiff.ac.uk/view/cardiffauthors/A0179150.html orcid:0000-0003-4628-9818 orcid:0000-0003-4628-9818 and Ridgwell, Andy 2014. Temperature-dependent remineralization and carbon cycling in the warm Eocene oceans. Palaeogeography, Palaeoclimatology, Palaeoecology 413 , pp. 158-166. 10.1016/j.palaeo.2014.05.019 https://doi.org/10.1016/j.palaeo.2014.05.019 doi:10.1016/j.palaeo.2014.05.019 QE Geology Article PeerReviewed 2014 ftunivcardiff https://doi.org/10.1016/j.palaeo.2014.05.019 2022-10-27T22:41:41Z Metabolic rates in heterotrophic bacteria are more sensitive to temperature than rates of primary production (e.g., López-Urrutia et al., 2006; Regaudie-de-Gioux and Duarte, 2012). Consequently, faster bacterial respiration rates in a warmer ocean may result in more efficient remineralization of sinking organic matter higher in the water column, with implications for carbon and nutrient cycling during warm climate states. This is supported by a series of reconstructed δ13CDIC: depth profiles based on well-preserved planktonic foraminifera assemblages from Tanzania from the warm Eocene epoch (55.5–33.7 Ma) when global surface and deep ocean temperatures exceeded those of the modern day (John et al., 2013). These results indicate relatively sharp δ13CDIC gradients in the upper water column which supports the hypothesis that high metabolic rates in warm Eocene oceans led to more efficient recycling of organic matter and reduced burial rates of organic carbon (Olivarez Lyle and Lyle, 2006). Shallower remineralization depths would also cause an upward displacement and intensification of the oxygen minimum zone which is consistent with evidence for a pelagic ecosystem that was focused in a narrow depth range near the surface during the warm early and middle Eocene. Here we use the Earth System model, cGENIE, that incorporates a new temperature dependence of remineralization rates to illustrate the potential effects of temperature on particulate organic carbon fluxes and hence vertical δ13CDIC gradients. Modeled δ13CDIC vertical profiles off the coast of Tanzania for the Eocene agree well with the reconstructed δ13CDIC profiles, supporting our interpretations based on temperature-dependent remineralization. Article in Journal/Newspaper Planktonic foraminifera Cardiff University: ORCA (Online Research @ Cardiff) Duarte ENVELOPE(-60.950,-60.950,-64.200,-64.200) Palaeogeography, Palaeoclimatology, Palaeoecology 413 158 166 |
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Cardiff University: ORCA (Online Research @ Cardiff) |
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ftunivcardiff |
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unknown |
topic |
QE Geology |
spellingShingle |
QE Geology John, Eleanor H. Wilson, Jamie D. Pearson, Paul Nicholas Ridgwell, Andy Temperature-dependent remineralization and carbon cycling in the warm Eocene oceans |
topic_facet |
QE Geology |
description |
Metabolic rates in heterotrophic bacteria are more sensitive to temperature than rates of primary production (e.g., López-Urrutia et al., 2006; Regaudie-de-Gioux and Duarte, 2012). Consequently, faster bacterial respiration rates in a warmer ocean may result in more efficient remineralization of sinking organic matter higher in the water column, with implications for carbon and nutrient cycling during warm climate states. This is supported by a series of reconstructed δ13CDIC: depth profiles based on well-preserved planktonic foraminifera assemblages from Tanzania from the warm Eocene epoch (55.5–33.7 Ma) when global surface and deep ocean temperatures exceeded those of the modern day (John et al., 2013). These results indicate relatively sharp δ13CDIC gradients in the upper water column which supports the hypothesis that high metabolic rates in warm Eocene oceans led to more efficient recycling of organic matter and reduced burial rates of organic carbon (Olivarez Lyle and Lyle, 2006). Shallower remineralization depths would also cause an upward displacement and intensification of the oxygen minimum zone which is consistent with evidence for a pelagic ecosystem that was focused in a narrow depth range near the surface during the warm early and middle Eocene. Here we use the Earth System model, cGENIE, that incorporates a new temperature dependence of remineralization rates to illustrate the potential effects of temperature on particulate organic carbon fluxes and hence vertical δ13CDIC gradients. Modeled δ13CDIC vertical profiles off the coast of Tanzania for the Eocene agree well with the reconstructed δ13CDIC profiles, supporting our interpretations based on temperature-dependent remineralization. |
format |
Article in Journal/Newspaper |
author |
John, Eleanor H. Wilson, Jamie D. Pearson, Paul Nicholas Ridgwell, Andy |
author_facet |
John, Eleanor H. Wilson, Jamie D. Pearson, Paul Nicholas Ridgwell, Andy |
author_sort |
John, Eleanor H. |
title |
Temperature-dependent remineralization and carbon cycling in the warm Eocene oceans |
title_short |
Temperature-dependent remineralization and carbon cycling in the warm Eocene oceans |
title_full |
Temperature-dependent remineralization and carbon cycling in the warm Eocene oceans |
title_fullStr |
Temperature-dependent remineralization and carbon cycling in the warm Eocene oceans |
title_full_unstemmed |
Temperature-dependent remineralization and carbon cycling in the warm Eocene oceans |
title_sort |
temperature-dependent remineralization and carbon cycling in the warm eocene oceans |
publisher |
Elsevier |
publishDate |
2014 |
url |
https://orca.cardiff.ac.uk/id/eprint/69537/ https://doi.org/10.1016/j.palaeo.2014.05.019 |
long_lat |
ENVELOPE(-60.950,-60.950,-64.200,-64.200) |
geographic |
Duarte |
geographic_facet |
Duarte |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
John, Eleanor H. https://orca.cardiff.ac.uk/view/cardiffauthors/A2909665.html, Wilson, Jamie D. https://orca.cardiff.ac.uk/view/cardiffauthors/A249157H.html, Pearson, Paul Nicholas https://orca.cardiff.ac.uk/view/cardiffauthors/A0179150.html orcid:0000-0003-4628-9818 orcid:0000-0003-4628-9818 and Ridgwell, Andy 2014. Temperature-dependent remineralization and carbon cycling in the warm Eocene oceans. Palaeogeography, Palaeoclimatology, Palaeoecology 413 , pp. 158-166. 10.1016/j.palaeo.2014.05.019 https://doi.org/10.1016/j.palaeo.2014.05.019 doi:10.1016/j.palaeo.2014.05.019 |
op_doi |
https://doi.org/10.1016/j.palaeo.2014.05.019 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
413 |
container_start_page |
158 |
op_container_end_page |
166 |
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1766170324281327616 |