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North Atlantic Midlatitude Surface-Circulation Changes Through the Plio-Pleistocene Intensification of Northern Hemisphere Glaciation

Bolton, Clara T; Bailey, Ian; Friedrich, O.; Tachikawa, K; de Garidel-Thoron, Thibault; Vidal, Sillvia M.; Sonzogni, Corinne; Marino, Gianluca; Rohling, Eelco; Robinson, Marci; Ermini, Magali; Koch, Mirjam; Cooper, M.J.; Wilson, Paul A.

Description

The North Atlantic Current (NAC) transports warm salty water to high northern latitudes, with important repercussions for ocean circulation and global climate. A southward displacement of the NAC and Subarctic Front, which separate subpolar and subtropical water masses, is widely suggested for the Last Glacial Maximum (LGM) and may have acted as a positive feedback in glacial expansion at this time. However, the role of the NAC during the intensification of Northern Hemisphere glaciation (iNHG)...[Show more]

dc.contributor.authorBolton, Clara T
dc.contributor.authorBailey, Ian
dc.contributor.authorFriedrich, O.
dc.contributor.authorTachikawa, K
dc.contributor.authorde Garidel-Thoron, Thibault
dc.contributor.authorVidal, Sillvia M.
dc.contributor.authorSonzogni, Corinne
dc.contributor.authorMarino, Gianluca
dc.contributor.authorRohling, Eelco
dc.contributor.authorRobinson, Marci
dc.contributor.authorErmini, Magali
dc.contributor.authorKoch, Mirjam
dc.contributor.authorCooper, M.J.
dc.contributor.authorWilson, Paul A.
dc.date.accessioned2020-03-31T00:26:35Z
dc.date.available2020-03-31T00:26:35Z
dc.identifier.issn1944-9186
dc.identifier.urihttp://hdl.handle.net/1885/202522
dc.description.abstractThe North Atlantic Current (NAC) transports warm salty water to high northern latitudes, with important repercussions for ocean circulation and global climate. A southward displacement of the NAC and Subarctic Front, which separate subpolar and subtropical water masses, is widely suggested for the Last Glacial Maximum (LGM) and may have acted as a positive feedback in glacial expansion at this time. However, the role of the NAC during the intensification of Northern Hemisphere glaciation (iNHG) at ~3.5 to 2.5 Ma is less clear. Here we present new records from Integrated Ocean Drilling Program Site U1313 (41°N) spanning ~2.8–2.4 Ma to trace the influence of Subarctic Front waters above this mid‐latitude site. We reconstruct surface and permanent pycnocline temperatures and seawater δ18O using paired Mg/Ca‐δ18O measurements on the planktic foraminifers Globigerinoides ruber and Globorotalia crassaformis and determine abundances of the subpolar foraminifer Neogloboquadrina atlantica. We find that the first significant glacial incursions of Subarctic Front surface waters above Site U1313 did not occur until ~2.6 Ma. At no time during our study interval was (sub)surface reorganization in the midlatitude North Atlantic analogous to the LGM. Our findings suggest that LGM‐like processes sensu stricto cannot be invoked to explain interglacial‐glacial cycle amplification during iNHG. They also imply that increased glacial productivity at Site U1313 during iNHG was not only driven by southward deflections of the Subarctic Front. We suggest that nutrient injection from cold‐core eddies and enhanced glacial dust delivery may have played additional roles in increasing export productivity in the midlatitude North Atlantic from 2.7 Ma.
dc.description.sponsorshipt. Funding for this research was provided by IODP France (C. T. B.) and the German Research Foundation (DFG) (grant OF 2544/2 to O. F.). I. B. is grateful to the UK IODP for financial support for shipboard and post-cruise participation in IODP Exp. 306. C. T. B., K. T., T. D. G., L. V., C. S., and M. E. acknowledge OSU Pythéas. M. M. R. acknowledges support by the USGS Land Change Science Program.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherWiley
dc.rights© 2018. American Geophysical Union.
dc.sourcePaleoceanography and Paleoclimatology
dc.titleNorth Atlantic Midlatitude Surface-Circulation Changes Through the Plio-Pleistocene Intensification of Northern Hemisphere Glaciation
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume33
dc.date.issued2018
local.identifier.absfor040399 - Geology not elsewhere classified
local.identifier.absfor040599 - Oceanography not elsewhere classified
local.identifier.ariespublicationu3102795xPUB73
local.publisher.urlhttps://www.wiley.com/en-gb
local.type.statusPublished Version
local.contributor.affiliationBolton, Clara T, Aix-Marseille University
local.contributor.affiliationBailey , Ian, University of Exeter
local.contributor.affiliationFriedrich, O., Universität Heidelberg
local.contributor.affiliationTachikawa, K, CEREGE UMR UAMIII CNRS CDF IRD
local.contributor.affiliationde Garidel-Thoron, Thibault, Aix Marseille Université
local.contributor.affiliationVidal, Sillvia M., Montreal General Hospital Dental Clinic
local.contributor.affiliationSonzogni, Corinne, Aix Marseille Université
local.contributor.affiliationMarino, Gianluca, College of Science, ANU
local.contributor.affiliationRohling, Eelco, College of Science, ANU
local.contributor.affiliationRobinson, Marci, US Geological Survey
local.contributor.affiliationErmini, Magali , Aix Marseille Université
local.contributor.affiliationKoch, Mirjam , Institut für Geowissenschaften, GoetheUniversität Frankfurt
local.contributor.affiliationCooper, M.J., University of Southampton
local.contributor.affiliationWilson, Paul A., National Oceanography Centre
local.bibliographicCitation.issue11
local.bibliographicCitation.startpage1186
local.bibliographicCitation.lastpage1205
local.identifier.doi10.1029/2018PA003412
local.identifier.absseo960399 - Climate and Climate Change not elsewhere classified
dc.date.updated2019-11-25T07:45:53Z
local.identifier.scopusID2-s2.0-85056363036
dcterms.accessRightsOpen Access
dc.provenancehttp://sherpa.ac.uk/romeo/issn/0883-8305/..."Publisher's version/PDF may be used 6 months after publication on an Institutional Repository or Governmental Repository only" from Sherpa/Romoe as at 31/03/2020.
CollectionsANU Research Publications

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