What happened at the end of the mid-Pleistocene transition in the Southern Hemisphere? Insights from western Tasmania, Australia

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dc.contributor.authorFletcher, MSen_AU
dc.contributor.authorLisé-Pronovost, Aen_AU
dc.contributor.authorMallett, Ten_AU
dc.contributor.authorMariani, Men_AU
dc.contributor.authorCooley, Sen_AU
dc.contributor.authorMay, JHen_AU
dc.contributor.authorGadd, PSen_AU
dc.contributor.authorHerries, Aen_AU
dc.contributor.authorBlaauw, Men_AU
dc.contributor.authorHeijnis, Hen_AU
dc.contributor.authorHodgson, DAen_AU
dc.contributor.authorPedro, JBen_AU
dc.date.accessioned2024-02-23T01:02:14Zen_AU
dc.date.available2024-02-23T01:02:14Zen_AU
dc.date.issued2019-07-30en_AU
dc.date.statistics2023-03-24en_AU
dc.description.abstractThe current southward shift in the southern westerlies that is stripping southern Australia of rainfall is unprecedented over the past 12 kyrs years at least, and is due to the effects of both the anthropogenic hole in the ozone layer and greenhouse gas-driven global warming. Predictions of future climate suggest the Earth is moving in to a “super-interglacial” (peak warming) because of anthropogenic greenhouse gas release. “Super-interglacials”, which are warmer than today, are uncommon in the geological record. A recent increase in the frequency of these peak warming events since ca. 450 ka (the end of the mid-Pleistocene transition; MPT) is associated with a 7° latitude southward shift of the southern westerlies and an increase in atmospheric CO2 that warmed the atmosphere - a stark similarity to current trends. Here, we present multi-proxy analyses of two closely spaced (<50 km) sediment cores that comprise a complete sequence from the mid-Pleistocene to the present from western Tasmania, Australia - in the mid-latitudes of the Southern Hemisphere. Lake Selina is a modern-day lake with a continuous ca. 230 kyr sediment sequence, while Darwin Crater is a palaeo-lake within a meteorite impact crater that formed at ca. 816 ka and which completely in-filled during MIS5 (ca. 120 ka). We report on petrophysical whole core logging, lithological core description, spectrophotometry, grain size, natural gamma ray, paleo- and rock-magnetism, loss-on-ignition, pollen analyses and micro-XRF geochemisrty. The composite record is unique in the Australian sector of the Southern Hemisphere and we discuss the data in the context of the global and regional changes that occurred at the end of MPT, paying particular attention to impact of the shift toward warmer super-interglacials, the large-scale southward shift of the southern westerlies and higher atmospheric CO2 content that occurred at ca. 450 ka (MIS11 to present).en_AU
dc.identifier.articlenumberP-4494en_AU
dc.identifier.citationFletcher, M.-S., Lisé-Pronovost, L., Mallett, T., Mariani, M., Cooley, S., May, J.-H., Gadd, P., Herroes, A., Blaauw, M., Heijnis, H., Hodgson, D., & Pedro, J. (2019). What happened at the end of the mid-Pleistocene transition in the Southern Hemisphere? Insights from western Tasmania, Australia. Poster presented to the 20th INQUA Congress, 25th - 31st July 2019, Dublin, Ireland, (P-4494). Retrieved from: https://virtual.oxfordabstracts.com/#/event/public/574/submission/1834en_AU
dc.identifier.conferenceenddate2019-07-31en_AU
dc.identifier.conferencename20th INQUA Congressen_AU
dc.identifier.conferenceplaceDublin, Irelanden_AU
dc.identifier.conferencestartdate2019-07-25en_AU
dc.identifier.urihttps://virtual.oxfordabstracts.com/#/event/public/574/submission/1834en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15410en_AU
dc.language.isoenen_AU
dc.publisherInternational Union for Quaternary Research (INQUA)en_AU
dc.subjectPleistocene Epochen_AU
dc.subjectSouthern Hemisphereen_AU
dc.subjectAustraliaen_AU
dc.subjectRainen_AU
dc.subjectWindsen_AU
dc.subjectTasmaniaen_AU
dc.subjectOzone layeren_AU
dc.subjectGreenhouse gasesen_AU
dc.subjectGreenhouse effecten_AU
dc.titleWhat happened at the end of the mid-Pleistocene transition in the Southern Hemisphere? Insights from western Tasmania, Australiaen_AU
dc.typeConference Posteren_AU
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