Decreasing Atmospheric CO2 During the Late Miocene Cooling
A pronounced late Miocene cooling (LMC) from ~7 to 5.7 Ma has been documented in extratropical and tropical sea surface temperature records, but to date, available proxy evidence has not revealed a significant pCO2 decline over this event. Here, we provide a new, high‐resolution pCO2 proxy record ov...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:10118747 2023-12-24T10:25:05+01:00 Decreasing Atmospheric CO2 During the Late Miocene Cooling Tanner, T Hernández-Almeida, I Drury, AJ Guitián, J Stoll, H 2020-12 text https://discovery.ucl.ac.uk/id/eprint/10118747/7/Drury_2020PA003925.pdf https://discovery.ucl.ac.uk/id/eprint/10118747/ eng eng https://discovery.ucl.ac.uk/id/eprint/10118747/7/Drury_2020PA003925.pdf https://discovery.ucl.ac.uk/id/eprint/10118747/ open Paleoceanography and Paleoclimatology , 35 (12) , Article e2020PA003925. (2020) Article 2020 ftucl 2023-11-27T13:07:38Z A pronounced late Miocene cooling (LMC) from ~7 to 5.7 Ma has been documented in extratropical and tropical sea surface temperature records, but to date, available proxy evidence has not revealed a significant pCO2 decline over this event. Here, we provide a new, high‐resolution pCO2 proxy record over the LMC based on alkenone carbon isotopic fractionation (εp) measured in sediments from the South Atlantic at Ocean Drilling Program (ODP) Site 1088. We apply a recent proxy calibration derived from a compilation of laboratory cultures, which more accurately reflects the proxy sensitivity to pCO2 changes during late Quaternary glacial‐interglacial cycles, together with new micropaleontological proxies to reconstruct past variations in algal growth rate, an important secondary influence on the εp. Our resulting pCO2 record suggests an approximately twofold to threefold decline over the LMC and confirms a strong coupling between climate and pCO2 through the late Miocene. Within this long‐term trend are pCO2 variations on sub‐myr timescales that may reflect 400‐kyr long‐eccentricity cycles, in which pCO2 minima coincide with several orbital‐scale maxima in published high‐resolution benthic δ18O records. These may correspond to ephemeral glaciations, potentially in the Northern Hemisphere. Our temperature and planktonic δ18O records from Site 1088 are consistent with substantial equatorward movement of Southern Ocean frontal systems during the LMC. This suggests that potential feedbacks between cooling, ocean circulation and deep ocean CO2 storage may warrant further investigation during the LMC. Article in Journal/Newspaper Southern Ocean University College London: UCL Discovery Southern Ocean |
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University College London: UCL Discovery |
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language |
English |
description |
A pronounced late Miocene cooling (LMC) from ~7 to 5.7 Ma has been documented in extratropical and tropical sea surface temperature records, but to date, available proxy evidence has not revealed a significant pCO2 decline over this event. Here, we provide a new, high‐resolution pCO2 proxy record over the LMC based on alkenone carbon isotopic fractionation (εp) measured in sediments from the South Atlantic at Ocean Drilling Program (ODP) Site 1088. We apply a recent proxy calibration derived from a compilation of laboratory cultures, which more accurately reflects the proxy sensitivity to pCO2 changes during late Quaternary glacial‐interglacial cycles, together with new micropaleontological proxies to reconstruct past variations in algal growth rate, an important secondary influence on the εp. Our resulting pCO2 record suggests an approximately twofold to threefold decline over the LMC and confirms a strong coupling between climate and pCO2 through the late Miocene. Within this long‐term trend are pCO2 variations on sub‐myr timescales that may reflect 400‐kyr long‐eccentricity cycles, in which pCO2 minima coincide with several orbital‐scale maxima in published high‐resolution benthic δ18O records. These may correspond to ephemeral glaciations, potentially in the Northern Hemisphere. Our temperature and planktonic δ18O records from Site 1088 are consistent with substantial equatorward movement of Southern Ocean frontal systems during the LMC. This suggests that potential feedbacks between cooling, ocean circulation and deep ocean CO2 storage may warrant further investigation during the LMC. |
format |
Article in Journal/Newspaper |
author |
Tanner, T Hernández-Almeida, I Drury, AJ Guitián, J Stoll, H |
spellingShingle |
Tanner, T Hernández-Almeida, I Drury, AJ Guitián, J Stoll, H Decreasing Atmospheric CO2 During the Late Miocene Cooling |
author_facet |
Tanner, T Hernández-Almeida, I Drury, AJ Guitián, J Stoll, H |
author_sort |
Tanner, T |
title |
Decreasing Atmospheric CO2 During the Late Miocene Cooling |
title_short |
Decreasing Atmospheric CO2 During the Late Miocene Cooling |
title_full |
Decreasing Atmospheric CO2 During the Late Miocene Cooling |
title_fullStr |
Decreasing Atmospheric CO2 During the Late Miocene Cooling |
title_full_unstemmed |
Decreasing Atmospheric CO2 During the Late Miocene Cooling |
title_sort |
decreasing atmospheric co2 during the late miocene cooling |
publishDate |
2020 |
url |
https://discovery.ucl.ac.uk/id/eprint/10118747/7/Drury_2020PA003925.pdf https://discovery.ucl.ac.uk/id/eprint/10118747/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Paleoceanography and Paleoclimatology , 35 (12) , Article e2020PA003925. (2020) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/10118747/7/Drury_2020PA003925.pdf https://discovery.ucl.ac.uk/id/eprint/10118747/ |
op_rights |
open |
_version_ |
1786200492674646016 |