dc.creatorFletcher, Michael-Shawn
dc.creatorBenson, Alexa
dc.creatorHeijnis, Hendrik
dc.creatorGadd, Patricia S.
dc.creatorCwynar, Les C.
dc.creatorRees, Andrew B. H.
dc.date.accessioned2015-10-08T19:35:06Z
dc.date.available2015-10-08T19:35:06Z
dc.date.created2015-10-08T19:35:06Z
dc.date.issued2015
dc.identifierQuaternary Science Reviews 122 (2015) 222-232
dc.identifierDOI: 10.1016/j.quascirev.2015.05.002
dc.identifierhttps://repositorio.uchile.cl/handle/2250/134294
dc.description.abstractWe use macroscopic charcoal and sediment geochemistry analysis of two proximal upper montane lakes located at 42 degrees S in southwest Tasmania, Australia, to test the role of the southern hemisphere westerly winds (SWW) and the El Nino-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.
dc.languageen
dc.publisherElsevier
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 Chile
dc.subjectEl Niño-Southern Oscillation (ENSO)
dc.subjectSouthern hemisphere westerly winds (SWW)
dc.subjectTasmania
dc.subjectSouthern Hemisphere
dc.subjectFire
dc.subjectGeochemistry
dc.subjectClimate
dc.subjectHolocene
dc.titleChanges in biomass burning mark the onset of an ENSO-influenced climate regime at 42 degrees S in southwest Tasmania, Australia
dc.typeArtículo de revista


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