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Holocene changes in atmospheric circulation recorded in the oxygen-isotope stratigraphy of lacustrine carbonates from northern Sweden

Department of Quaternary Geology, Lund University, Tornav. 13, SE-223 63 Lund, Sweden; dan.hammarlundKgeol.lu.se

Lena Barnekow

Department of Quaternary Geology, Lund University, Tornav. 13, SE-223 63 Lund, Sweden

H. J.B. Birks

Botanical Institute, University of Bergen, Allég. 41, N-5007 Bergen, Norway, and Environmental Change Research Centre, University College London, 26 Bedford Way, London, WC1H 0AP, UK

Bjørn Buchardt

Geological Institute, University of Copenhagen, Øster Voldg. 10, DK-1350 Copenhagen K, Denmark

Thomas W.D. Edwards

Department of Earth Sciences and Quaternary Sciences Institute, University of Waterloo, Waterloo, ON N2L 3G1, Canada

The oxygen-isotope composition of local precipitation (d¹⁸O_P) is reconstructed from carbonate lake-sediment components in a sediment core covering the last 10000 calendar years from Lake Tibetanus, a small, hydrologically open, groundwater-fed lake in the Abisko area, northern Sweden. Comparison of the d¹⁸O_P history with a pollen-based palaeotemperature record from the same core clearly reveals pronounced deviations from the normally expected temporal d¹⁸O_P-temperature relation (so-called ‘Dansgaard relation’) that may be a function of changing oceanicity. The transition from relatively moist, maritime conditions in the early Holo cene to a much drier climate after 6500 cal. BP is re‘ ected by major changes in forest extent and composition as recorded by pollen and plant macrofossil data. At the time of maximum in‘ uence of westerly air-mass circulation (high zonal index) c. 9500 cal. BP, brought about by high summer insolation and enhanced meridi onal pressure gradients, d¹⁸O_P at Lake Tibetanus was about 2 higher than would be predicted by the modern isotope-temperature relation. The occurrence of long-term changes in d¹⁸O_P-temperature relations, which are more sensitive measures of palaeoclimate than either d¹⁸O_P or temperature alone, needs to be taken into account when extracting palaeoclimatic information from continental oxygen-isotope records.

Key Words: Palaeoclimate • atmospheric circulation • stable isotopes • oxygen-isotope stratigraphy • lacustrine carbonates • pollen-climate transfer functions • Holocene • northern Sweden

The Holocene, Vol. 12, No. 3, 339-351 (2002)
DOI: 10.1191/0959683602hl548rp


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