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dc.contributor.author
Tanner, Thomas
dc.contributor.author
Hernández-Almeida, Iván
dc.contributor.author
Drury, Anna J.
dc.contributor.author
Guitián, José
dc.contributor.author
Stoll, Heather
dc.date.accessioned
2021-01-11T09:59:10Z
dc.date.available
2021-01-03T03:35:59Z
dc.date.available
2021-01-11T09:59:10Z
dc.date.issued
2020-12
dc.identifier.issn
2572-4525
dc.identifier.issn
2572-4517
dc.identifier.other
10.1029/2020PA003925
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/458845
dc.description.abstract
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. ©2020. American Geophysical Union. All Rights Reserved.
en_US
dc.language.iso
en
en_US
dc.publisher
Wiley
en_US
dc.title
Decreasing Atmospheric CO2 During the Late Miocene Cooling
en_US
dc.type
Journal Article
dc.date.published
2020-12-10
ethz.journal.title
Paleoceanography and Paleoclimatology
ethz.journal.volume
35
en_US
ethz.journal.issue
12
en_US
ethz.pages.start
e2020PA003925
en_US
ethz.size
25 p.
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Hoboken, Nj
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02704 - Geologisches Institut / Geological Institute::09601 - Stoll, Heather / Stoll, Heather
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02704 - Geologisches Institut / Geological Institute::09601 - Stoll, Heather / Stoll, Heather
ethz.date.deposited
2021-01-03T03:36:10Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2021-01-11T09:59:18Z
ethz.rosetta.lastUpdated
2021-02-15T23:05:28Z
ethz.rosetta.versionExported
true
ethz.COinS
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