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Evolution of west‐east contrast in the subarctic pacific gyre during the plio‐pleistocene based on palynological evidence at ODP sites 882 and 887

2024-09Journal article Open access
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dc.contributor.authorZorzi, Coralie
dc.contributor.authorVernal, A. de
dc.date.accessioned2024-11-06T12:09:38Z
dc.date.available2024-11-06T12:09:38Z
dc.date.issued2024-09
dc.description.abstractFragmentary and contradictory evidence prevents a clear understanding of the possible role of the North Pacific Ocean surface on the ice-sheet evolution. New palynological data encompassing the Pliocene and Pleistocene at Ocean Drilling Program Site 882 in the northwest Pacific document sea-surface conditions from dinoflagellate cysts in addition to atmospheric trajectories from pollen grains and spores. The comparison of the Site 882 record with that of Site 887 from the northeast Pacific also permits documenting West to East contrasts across the subarctic North Pacific. The dinocyst assemblages at the two sites indicate strong temperature contrasts until 4.2 Ma, with much warmer conditions in the East. From 4.2 to 3.6 Ma, dinocyst assemblages of both sites are characterized by alternated dominance of the extinct taxa Habibacysta tectata and Impagidinium detroitense suggesting homogenous and cool conditions across the subarctic Pacific gyre. A major transition is recorded in the palynological assemblages at Site 882 around 2.7 Ma. It is marked by the highest occurrence of Habibacysta tectata and high percentages of Filisphaera microornata additionally to thermophilic taxa. Dinocyst record indicates high seasonality and warmer surface conditions due to reinforced stratification, which support the hypothesis of high evaporation at the origin of atmospheric moisture supply to high latitudes. During the last 1.2 Ma, the increase of Operculodinium centrocarpum relative to Nematosphaeropsis labyrinthus is tentatively interpreted as a reinforced influence of the subtropical waters. Hence, we suggest that the warm surface ocean fostered the inception and growth of northwestern North American ice-sheets during the Pliocene and Pleistocene. Dinocyst assemblages in the subarctic Pacific record changes in temperature and productivity through the Plio-Pleistocene The major transitions reflect halocline onset at 2.7 Ma and a major cooling at 1.7 Ma Subarctic ocean temperature and Westerlies migration may have affected northward moisture supply and ice-sheet growth over North America.eng
dc.identifier.doi10.1029/2024pa004873
dc.identifier.issn2572-4517
dc.identifier.issn2572-4525
dc.identifier.urihttp://hdl.handle.net/10400.1/26216
dc.language.isoeng
dc.peerreviewedyes
dc.publisherAmerican Geophysical Union
dc.relationAlgarve Centre for Marine Sciences
dc.relationAlgarve Centre for Marine Sciences
dc.relationCentre for Marine and Environmental Research
dc.relation.ispartofPaleoceanography and Paleoclimatology
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectNorth Pacific Ocean
dc.subjectPliocene
dc.subjectDinocysts
dc.subjectPollen grains
dc.subjectBiozonation
dc.subjectSea surface reconstructions
dc.titleEvolution of west‐east contrast in the subarctic pacific gyre during the plio‐pleistocene based on palynological evidence at ODP sites 882 and 887eng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleCentre for Marine and Environmental Research
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0101%2F2020/PT
oaire.citation.issue9
oaire.citation.startPagee2024PA004873
oaire.citation.titlePaleoceanography and Paleoclimatology
oaire.citation.volume39
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameZorzi
person.givenNameCoralie
person.identifier.orcid0000-0002-4910-5255
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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