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dc.contributor.authorKender, S
dc.contributor.authorAturamu, A
dc.contributor.authorZalasiewicz, J
dc.contributor.authorKaminski, MA
dc.contributor.authorWilliams, M
dc.date.accessioned2019-12-03T13:05:40Z
dc.date.issued2019-12-03
dc.description.abstracthe Mid-Brunhes Transition (MBT) saw an increase in the amplitude of glacial cycles expressed in ice core and deep ocean records from about 400 ka, but its influence on high-latitude climates is not fully understood. The Arctic Ocean is thought to have warmed and exhibited reduced sea ice, but little is known of sea ice marginal locations such as the Bering Sea. The Bering Sea is the link between the Arctic and Pacific Ocean and is an area of high productivity and CO2 ventilation; it hosts a pronounced oxygen minimum zone (OMZ) and is thought to be the location of Glacial North Pacific Intermediate Water (GNPIW) formation in the Pleistocene. To understand palaeoceanographic change in the region, we analysed benthic foraminiferal faunas from Bowers Ridge (Site U1342, 800 m of water depth) over the past 600 kyr, as they are uniquely well preserved and sensitive to changes in deep and surface ocean conditions. We identified and imaged 71 taxa and provide a full taxonomy. Foraminiferal preservation is markedly higher during glacials, indicating the presence of less corrosive GNPIW. The most abundant species are Bulimina exilis, Takayanagia delicata, Alabaminella weddellensis, Gyroidina sp. 2, Cassidulina laevigata, Islandiella norcrossi, and Uvigerina bifurcata, consistent with broadly high net primary production throughout the last 600 kyr. Correspondence analysis shows that the most significant Assemblage 1 comprises B. exilis, T. delicata, Bolivina spissa, and Brizalina, which occur sporadically within intervals of laminated, biogenic-rich sediment, mostly during glacials and also some deglacials, and are interpreted as indicating very high productivity. Other assemblages contain the phytodetritivore species A. weddellensis, I. norcrossi, and C. laevigata, indicative of seasonal phytoplankton blooms. Before the MBT, more numerous intervals of the very high-productivity Assemblage 1 and A. weddellensis occur, which we suggest reflect a time of more sea-ice-related seasonal stratification and ice edge blooms. Our inference of a decrease in sea ice meltwater stratification influence in the central Bering Sea after the MBT is consistent with records showing that the Arctic and Pacific Ocean warmed during glacials and suggests that high-latitude productivity and sea ice changes were an important feature of this climate event.en_GB
dc.description.sponsorshipEkiti State Universityen_GB
dc.description.sponsorshipInternational Ocean Discovery Program (UK IODP)en_GB
dc.description.sponsorshipKing Abdulaziz City for Science and Technology (KACST)en_GB
dc.identifier.citationVol. 38, pp. 177 - 187en_GB
dc.identifier.doi10.5194/jm-38-177-2019
dc.identifier.urihttp://hdl.handle.net/10871/39927
dc.language.isoenen_GB
dc.publisherCopernicus Publications / Micropalaeontology Societyen_GB
dc.relation.urlhttps://doi.org/10.5194/jm-38-177-2019-supplementen_GB
dc.rights© Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License.en_GB
dc.titleBenthic foraminifera indicate Glacial North Pacific Intermediate Water and reduced primary productivity over Bowers Ridge, Bering Sea, since the Mid-Brunhes Transitionen_GB
dc.typeArticleen_GB
dc.date.available2019-12-03T13:05:40Z
dc.descriptionThis is the final version. Available on open access from Copernicus Publications via the DOI in this recorden_GB
dc.descriptionData availability. All of the data underlying this research are available in the Supplement: https://doi.org/10.5194/jm-38-177-2019-supplementen_GB
dc.identifier.eissn2041-4978
dc.identifier.journalJournal of Micropalaeontologyen_GB
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_GB
dcterms.dateAccepted2019-11-11
rioxxterms.versionVoRen_GB
rioxxterms.licenseref.startdate2019-11-11
rioxxterms.typeJournal Article/Reviewen_GB
refterms.dateFCD2019-12-03T13:02:53Z
refterms.versionFCDVoR
refterms.dateFOA2019-12-03T13:05:52Z
refterms.panelBen_GB


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© Author(s) 2019. This work is distributed under
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Except where otherwise noted, this item's licence is described as © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License.