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Calibration of the speleothem delta function: an absolute temperature record for the Holocene in northern Norway

Department of Geology, Bergen University, Allégaten 41, N-5007 Bergen, Norway

Joyce Lundberg

Department of Geography, Carleton University, Ottawa, Ontario K1S 5B6, Canada

The speleothem delta function (SDF) provides a new transfer function between the d₁₈O signal of speleothem calcite and surface ground temperature. The function is based on physical principles, relating d₁₈O of the calcite to thermodynamic fractionation, and to the dripwater function, which in turn relates d₁₈O of dripwaters to that of the local precipitation and thus to the modification of source water in relationship to the geographical position of the site. The SDF must be calibrated against at least two reliable and well-dated palaeotemperature points. The end product is a reconstruction of absolute cave and surface temperatures. The technique is tested using a Holocene speleothem from north Norway, SG93, dated by 12 TIMS U-Th dates. The reconstructed temperature curve is presented and compared with the GISP2 ice-core record and with the historic record. In both cases the correlation with SG93 is impressive, indicating the validity of the technique.

Key Words: Speleothem • palaeoclimate • proxy • transfer function • oxygen isotopes • 18O • speleothem delta function • uranium-thorium dating • Holocene • Norway

The Holocene, Vol. 9, No. 6, 659-669 (1999)
DOI: 10.1191/095968399667823929


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