Late Holocene temperature variability in Tasmania inferred from borehole
Asadusjjaman Suman, Fiona Dyer, and Duanne White
Institute for Applied Ecology, University of Canberra, ACT 2601, Australia
Received: 29 Nov 2016 – Accepted for review: 04 Dec 2016 – Discussion started: 15 Dec 2016
Abstract. Thirty six borehole temperature depth profiles were analysed to reconstruct the Ground Surface Temperature History (GSTH) from eastern Tasmania for the past five centuries. We used the Singular Value Decomposition method to invert borehole temperatures to produce temperature histories. The quality of borehole data was classified as high or low based on model misfit. The quality of the borehole data was not dependent on topography, or land use. Analysis reveals that 3–5 high quality borehole temperature depth profiles were adequate to reconstruct robust paleotemperature records from any area. Temperature changes were greatest around the north east coast and decreases towards midland of Tasmania. Warm East Australian Current (EAC) flow towards north east coast of Tasmania during summer was considered a prime driver of warmer temperatures observed for the north east coast. Average, GSTH reconstructed from Tasmanian boreholes shows temperature increases about 1.2 ± 0.2 °C during the past five centuries. Some boreholes show temperature cooling in the beginning of 20th Century that may be an indication of late LIA response in Tasmania. Reconstructed temperatures were consistent with meteorological records and other proxy records from Tasmania during their period of overlap.
Suman, A., Dyer, F., and White, D.: Late Holocene temperature variability in Tasmania inferred from borehole
temperature data, Clim. Past Discuss., doi:10.5194/cp-2016-127, in review, 2016.