Changes in biomass burning mark the onset of an ENSO-influenced climate regime at 42°S in southwest Tasmania, Australia

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dc.contributor.authorFletcher, MSen_AU
dc.contributor.authorBenson, Aen_AU
dc.contributor.authorHeijnis, Hen_AU
dc.contributor.authorGadd, PSen_AU
dc.contributor.authorCwynar, Len_AU
dc.contributor.authorRees, ABHen_AU
dc.date.accessioned2021-06-03T03:17:32Zen_AU
dc.date.available2021-06-03T03:17:32Zen_AU
dc.date.issued2015-06-15en_AU
dc.date.statistics2021-05-27en_AU
dc.description.abstractWe use macroscopic charcoal and sediment geochemistry analysis of two proximal upper montane lakes located at 42°S in southwest Tasmania, Australia, to test the role of the southern hemisphere westerly winds (SWW) and the El Niño-Southern Oscillation (ENSO) in governing the climate of this sector of the southern mid-to high-latitudes. Inter-annual climate anomalies in the study area are driven by changes in both ENSO and the Southern Annular Mode (SAM - an index that describes seasonal to decadal shifts in the SWW), making it an ideal location to test assumptions about the varying influence of the SWW and ENSO, two important components of the global climate system, through time. We find multi-millennial scale trends in fire activity that are remarkably consistent with trends in hydroclimate reconstructed at the same latitude in southern South America, providing empirical support for the notion of zonally symmetric changes in the SWW governing the climate at this latitude in the Southern Hemisphere between 12 and 5 cal ka BP. A transition from multi-millennial scale to sub-millennial scale trends in fire activity occurs after ca 5 cal ka BP in concert with the onset of high frequency and amplitude ENSO variability in the tropical Pacific Ocean region. We conclude that the onset of sub-millennial scale trends in ENSO drove changes in fire activity in our study region over the last ca 5 cal ka. Geochemical data reveals divergent local impacts at the two study sites in response to these major climate transitions that are related to local topography and geography. © 2015 Elsevier Ltd.en_AU
dc.identifier.citationFletcher, M.-S., Benson, A., Heijnis, H., Gadd, P. S., Cwynar, L. C., & Rees, A. B. (2015). Changes in biomass burning mark the onset of an ENSO-influenced climate regime at 42°S in southwest Tasmania, Australia. Quaternary Science Reviews, 122, 222-232. doi:10.1016/j.quascirev.2015.05.002en_AU
dc.identifier.issn0277-3791en_AU
dc.identifier.journaltitleQuaternary Science Reviewsen_AU
dc.identifier.pagination222-232en_AU
dc.identifier.urihttps://doi.org/10.1016/j.quascirev.2015.05.002en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10811en_AU
dc.identifier.volume122en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectSouthern Oscillationen_AU
dc.subjectWinden_AU
dc.subjectSouthern Hemisphereen_AU
dc.subjectClimatesen_AU
dc.subjectTasmaniaen_AU
dc.subjectAustraliaen_AU
dc.subjectFiresen_AU
dc.subjectGeochemistryen_AU
dc.subjectBiomassen_AU
dc.subjectQuaternary perioden_AU
dc.titleChanges in biomass burning mark the onset of an ENSO-influenced climate regime at 42°S in southwest Tasmania, Australiaen_AU
dc.typeJournal Articleen_AU
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