Late glacial and Holocene climate change in the subantarctic Auckland Islands

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dc.contributor.authorGilmer, Gen_AU
dc.contributor.authorMoy, CMen_AU
dc.contributor.authorVandergoes, MJen_AU
dc.contributor.authorGadd, PSen_AU
dc.contributor.authorRiesselman, CRen_AU
dc.contributor.authorJacobsen, GEen_AU
dc.contributor.authorWilson, GSen_AU
dc.contributor.authorVisinand, Cen_AU
dc.date.accessioned2021-06-10T01:38:23Zen_AU
dc.date.available2021-06-10T01:38:23Zen_AU
dc.date.issued2017-12-14en_AU
dc.date.statistics2021-06-08en_AU
dc.descriptionPaper was not presented at Conference - marked Withdrawn on website.en_AU
dc.description.abstractSituated within the core of the Southern Hemisphere westerly winds, and between the subtropical and subantarctic fronts, the New Zealand subantarctic islands are uniquely positioned to evaluate past ocean and atmospheric change in the middle to high southern latitudes. We collected a series of sediment cores from Auckland Island fjords to produce a high-resolution record of climate change following the Last Glacial Maximum. Physical property and organic geochemical data, Itrax XRF, and visual core descriptions indicate the cores capture several phases of sedimentation. From these studies, we identify four primary sedimentary facies: 1) a deglacial facies exhibiting mm-scale laminae defined by magnetic susceptibility and density contrasts and high counts of elements associated with terrigenous sources; 2) a lacustrine facies defined by very low density, high organic carbon concentrations and low counts of lithophilic elements; 3) a marine transgression facies with moderate density, moderate bioturbation and alternating marine and lacustrine sedimentary components; 4) a marine facies that contains biogenic carbonate. Radiocarbon results indicate deglacial sedimentation was underway in the basin by approximately 19,000 cal yr BP. Lacustrine deposition in ice-free conditions began around 15,600 cal yr BP and continued until marine transgression at approximately 9,500 cal yr BP. During the early Holocene between 11 and 9.5 ka, we observe elevated n-alkane δD values and an overall increase in redox-sensitive elements that signal a combination of warmer atmospheric temperatures and reduced westerly wind strength that drives fjord stratification. Poleward-shifted westerlies south of the Auckland Islands could accommodate these results, but there are few records to corroborate this interpretation. We will discuss these results within the context of developing New Zealand and subantarctic paleoclimate records in order to provide a more comprehensive record of past change.en_AU
dc.identifier.booktitleAGU Fall Meting Abstractsen_AU
dc.identifier.citationGilmer, G., Moy, C. M., Vandergoes, M., Gadd, P., Riesselman, C. R., Jacobsen, G. E., Wilson, G. S. & Visinand, C. (2017). Late glacial and Holocene climate change in the subantarctic Auckland Islands. In AGU Fall Meeting Abstracts, New Orleans, Louisiana, 11 to 15 December 2017. Retrieved from: https://agu.confex.com/agu/fm17/meetingapp.cgi/Paper/268508en_AU
dc.identifier.conferenceenddate15 December 2017en_AU
dc.identifier.conferencenameAGU Fall Meetingen_AU
dc.identifier.conferenceplaceNew Orleans, USAen_AU
dc.identifier.conferencestartdate11 December 2017en_AU
dc.identifier.otherPP43B-1350en_AU
dc.identifier.urihttps://agu.confex.com/agu/fm17/meetingapp.cgi/Paper/268508en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10840en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Union (AGU)en_AU
dc.subjectClimate modelsen_AU
dc.subjectClimatesen_AU
dc.subjectClimatic changeen_AU
dc.subjectAtmospheric circulationen_AU
dc.subjectOceanographyen_AU
dc.subjectBiogeochemistryen_AU
dc.subjectQuaternary perioden_AU
dc.subjectNew Zealanden_AU
dc.titleLate glacial and Holocene climate change in the subantarctic Auckland Islandsen_AU
dc.typeConference Abstracten_AU
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