New Tie points, organic and inorganic data, growth rate and pCO2 reconstructions for the late Miocene Cooling of ODP Hole 177-1088B
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 ove...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.924529 2023-05-15T18:25:49+02:00 New Tie points, organic and inorganic data, growth rate and pCO2 reconstructions for the late Miocene Cooling of ODP Hole 177-1088B Tanner, Thomas Hernández-Almeida, Iván Drury, Anna Joy Guitián, José Stoll, Heather M LATITUDE: -41.136060 * LONGITUDE: 13.562830 * DATE/TIME START: 1997-12-17T09:45:00 * DATE/TIME END: 1997-12-17T23:15:00 2020-11-09 application/zip, 6 datasets https://doi.pangaea.de/10.1594/PANGAEA.924529 https://doi.org/10.1594/PANGAEA.924529 en eng PANGAEA Tanner, Thomas; Hernández-Almeida, Iván; Drury, Anna Joy; Guitián, José; Stoll, Heather M (in review): Decreasing atmospheric CO2 during the Late Miocene Cooling. https://doi.pangaea.de/10.1594/PANGAEA.924529 https://doi.org/10.1594/PANGAEA.924529 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY age model Ocean Drilling Program ODP ODP Site 1088B Dataset 2020 ftpangaea https://doi.org/10.1594/PANGAEA.924529 2023-01-20T07:34:40Z 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 late Miocene cooling based on alkenone carbon isotopic fractionation (εp) measured in sediments from the South Atlantic at 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 a 2-3 fold decline over the late Miocene Cooling 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 400kyr long-eccentricity cycles, in which pCO2 minima coincide with several orbital scale maxima in published high-resolution benthic ????18O records. These may correspond to ephemeral glaciations, potentially in the Northern Hemisphere. Our temperature and planktonic ????18O 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. Dataset Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Southern Ocean ENVELOPE(13.562830,13.562830,-41.136060,-41.136060) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
age model Ocean Drilling Program ODP ODP Site 1088B |
spellingShingle |
age model Ocean Drilling Program ODP ODP Site 1088B Tanner, Thomas Hernández-Almeida, Iván Drury, Anna Joy Guitián, José Stoll, Heather M New Tie points, organic and inorganic data, growth rate and pCO2 reconstructions for the late Miocene Cooling of ODP Hole 177-1088B |
topic_facet |
age model Ocean Drilling Program ODP ODP Site 1088B |
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 late Miocene cooling based on alkenone carbon isotopic fractionation (εp) measured in sediments from the South Atlantic at 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 a 2-3 fold decline over the late Miocene Cooling 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 400kyr long-eccentricity cycles, in which pCO2 minima coincide with several orbital scale maxima in published high-resolution benthic ????18O records. These may correspond to ephemeral glaciations, potentially in the Northern Hemisphere. Our temperature and planktonic ????18O 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 |
Dataset |
author |
Tanner, Thomas Hernández-Almeida, Iván Drury, Anna Joy Guitián, José Stoll, Heather M |
author_facet |
Tanner, Thomas Hernández-Almeida, Iván Drury, Anna Joy Guitián, José Stoll, Heather M |
author_sort |
Tanner, Thomas |
title |
New Tie points, organic and inorganic data, growth rate and pCO2 reconstructions for the late Miocene Cooling of ODP Hole 177-1088B |
title_short |
New Tie points, organic and inorganic data, growth rate and pCO2 reconstructions for the late Miocene Cooling of ODP Hole 177-1088B |
title_full |
New Tie points, organic and inorganic data, growth rate and pCO2 reconstructions for the late Miocene Cooling of ODP Hole 177-1088B |
title_fullStr |
New Tie points, organic and inorganic data, growth rate and pCO2 reconstructions for the late Miocene Cooling of ODP Hole 177-1088B |
title_full_unstemmed |
New Tie points, organic and inorganic data, growth rate and pCO2 reconstructions for the late Miocene Cooling of ODP Hole 177-1088B |
title_sort |
new tie points, organic and inorganic data, growth rate and pco2 reconstructions for the late miocene cooling of odp hole 177-1088b |
publisher |
PANGAEA |
publishDate |
2020 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.924529 https://doi.org/10.1594/PANGAEA.924529 |
op_coverage |
LATITUDE: -41.136060 * LONGITUDE: 13.562830 * DATE/TIME START: 1997-12-17T09:45:00 * DATE/TIME END: 1997-12-17T23:15:00 |
long_lat |
ENVELOPE(13.562830,13.562830,-41.136060,-41.136060) |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Tanner, Thomas; Hernández-Almeida, Iván; Drury, Anna Joy; Guitián, José; Stoll, Heather M (in review): Decreasing atmospheric CO2 during the Late Miocene Cooling. https://doi.pangaea.de/10.1594/PANGAEA.924529 https://doi.org/10.1594/PANGAEA.924529 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.924529 |
_version_ |
1766207494153043968 |