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dc.contributor.authorTrudgill, M. D.
dc.contributor.authorShuttleworth, R.
dc.contributor.authorBostock, H. C.
dc.contributor.authorBurke, A.
dc.contributor.authorCooper, M. J.
dc.contributor.authorGreenop, R.
dc.contributor.authorFoster, G. L.
dc.date.accessioned2021-05-31T23:41:21Z
dc.date.available2021-05-31T23:41:21Z
dc.date.issued2020-12-01
dc.identifier.citationTrudgill , M D , Shuttleworth , R , Bostock , H C , Burke , A , Cooper , M J , Greenop , R & Foster , G L 2020 , ' The flux and provenance of dust delivered to the SW Pacific during the last glacial maximum ' , Paleoceanography and Paleoclimatology , vol. 35 , no. 12 , e2020PA003869 . https://doi.org/10.1029/2020PA003869en
dc.identifier.issn2572-4525
dc.identifier.otherPURE: 271404441
dc.identifier.otherPURE UUID: eb14a171-056f-4ed8-a836-087770272eb1
dc.identifier.otherRIS: urn:2059B3C0DCE408D8ED70E74ECD50FBBC
dc.identifier.otherORCID: /0000-0002-3754-1498/work/85168058
dc.identifier.otherORCID: /0000-0002-1421-7994/work/85168522
dc.identifier.otherWOS: 000603661700003
dc.identifier.otherScopus: 85098134193
dc.identifier.urihttp://hdl.handle.net/10023/23291
dc.descriptionThe funding for the TAN1106 voyage was from the Coasts and Oceans Physical Resources program awarded to the National Institute of Water and Atmospheric Research, New Zealand. This work was funded by NERC studentship NE/L002531/1 to R.S. and NERC grant NE/J021075/1 to G.L.F. R.G. and A.B. were supported by NERC grant NE/M004619/1 awarded to A.B.en
dc.description.abstractAtmospheric dust is a primary source of iron (Fe) to the open ocean, and its flux is particularly important in the high nutrient, low chlorophyll (HNLC) Southern Ocean where Fe currently limits productivity. Alleviation of this Fe limitation in the Subantarctic Zone of the Atlantic by increased dust-borne Fe supply during glacial periods has been shown to increase primary productivity. However, previous work has found no such increase in productivity in the Pacific sector. In order to constrain the relative importance of Southern Ocean Fe fertilization on glacial-interglacial carbon cycles, records of dust fluxes outside of the Atlantic sector of the Southern Ocean at the Last Glacial Maximum (LGM) are required. Here we use grain size and U-series analyses to reconstruct lithogenic and CaCO3 fluxes, and Nd, Sr and Pb isotopes to ascertain the provenance of terrigenous material delivered to four deep-water cores in the SW Pacific Ocean over the last ~30kyr. We find evidence for an increase in the relative proportion of fine-grained (0.5-12 ?m) terrigenous sediment and higher detrital fluxes during the LGM compared to the Holocene. The provenance of the LGM dust varied spatially, with an older, more "continental" signature (low εNd, high 87Sr/86Sr) sourced from Australia in the northern cores, and a younger, more volcanogenic source in the southern cores (high εNd, low 87Sr/86Sr), likely sourced locally from New Zealand. Given this increase in lithogenic flux to the HNLC subantarctic Pacific Southern Ocean during the LGM, factors besides Fe-supply must have regulated the biological productivity here.
dc.language.isoeng
dc.relation.ispartofPaleoceanography and Paleoclimatologyen
dc.rightsCopyright © 2020 American Geophysical Union. All Rights Reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1029/2020PA003869en
dc.subjectDust provenanceen
dc.subjectNd, Sr, Pb isotopesen
dc.subjectSW Pacificen
dc.subject232Th-fluxesen
dc.subjectSubantarctic Zoneen
dc.subjectLast Glacial Maximumen
dc.subjectGE Environmental Sciencesen
dc.subjectDASen
dc.subject.lccGEen
dc.titleThe flux and provenance of dust delivered to the SW Pacific during the last glacial maximumen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Earth & Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews.St Andrews Isotope Geochemistryen
dc.identifier.doihttps://doi.org/10.1029/2020PA003869
dc.description.statusPeer revieweden
dc.date.embargoedUntil2021-06-01


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