Centennial-scale trends in the Southern Annular Mode revealed by hemisphere-wide fire and hydroclimatic trends over the past 2400 years

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dc.contributor.authorFletcher, MSen_AU
dc.contributor.authorBenson, Ben_AU
dc.contributor.authorBowman, DMJSen_AU
dc.contributor.authorGadd, PSen_AU
dc.contributor.authorHeijnis, Hen_AU
dc.contributor.authorMariani, Men_AU
dc.contributor.authorSaunders, KMen_AU
dc.contributor.authorWolfe, BBen_AU
dc.contributor.authorZawadzki, Aen_AU
dc.date.accessioned2021-06-10T03:44:53Zen_AU
dc.date.available2021-06-10T03:44:53Zen_AU
dc.date.issued2018-02-15en_AU
dc.date.statistics2021-06-04en_AU
dc.description.abstractMillennial-scale latitudinal shifts in the southern westerly winds (SWW) drive changes in Southern Ocean upwelling, leading to changes in atmospheric CO2 levels, thereby affecting the global climate and carbon cycle. Our aim here is to understand whether century-scale shifts in the SWW also drive changes in atmospheric CO2 content. We report new multiproxy lake sediment data from southwest Tasmania, Australia, that show centennial-scale changes in vegetation and fire activity over the past 2400 yr. We compare our results with existing data from southern South America and reveal synchronous and in-phase centennial-scale trends in vegetation and fire activity between southwest Tasmania and southern South America over the past 2400 yr. Interannual to centennial-scale rainfall anomalies and fire activity in both these regions are significantly correlated with shifts in the SWW associated with the Southern Annular Mode (SAM; atmospheric variability of the Southern Hemisphere). Thus, we interpret the centennial-scale trends we have identified as reflecting century-scale SAM-like shifts in the SWW over the past 2400 yr. We identify covariance between our inferred century-scale shifts in the SWW and Antarctic ice core CO2 values, demonstrating that the SWW-CO2 relationship operating at a millennial scale also operates at a centennial scale through the past 2400 yr. Our results indicate a possible westerly-driven modulation of recent increases in global atmospheric CO2 content that could potentially exacerbate current greenhouse gas–related warming. © 2021 Geological Society of Americaen_AU
dc.identifier.citationFletcher, M.-S., Benson, A., Bowman, D. M., Gadd, P. S., Heijnis, H., Mariani, M., Saunders, K. M., Wolfe, B. B. & Zawadzki, A. (2018). Centennial-scale trends in the Southern Annular Mode revealed by hemisphere-wide fire and hydroclimatic trends over the past 2400 years. Geology, 46(4), 363-366. doi:10.1130/G39661.1en_AU
dc.identifier.issn1943-2682en_AU
dc.identifier.issue4en_AU
dc.identifier.journaltitleGeologyen_AU
dc.identifier.pagination363-366en_AU
dc.identifier.urihttps://doi.org/10.1130/G39661.1en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10852en_AU
dc.identifier.volume46en_AU
dc.language.isoenen_AU
dc.publisherGeological Society of Americaen_AU
dc.subjectAustralasiaen_AU
dc.subjectAustraliaen_AU
dc.subjectCarbonen_AU
dc.subjectCarbon 14en_AU
dc.subjectCenozoic Eraen_AU
dc.subjectCharcoalen_AU
dc.subjectFiresen_AU
dc.subjectDrill coresen_AU
dc.titleCentennial-scale trends in the Southern Annular Mode revealed by hemisphere-wide fire and hydroclimatic trends over the past 2400 yearsen_AU
dc.typeJournal Articleen_AU
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