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Holocene climatic change in Swedish Lapland inferred from an oxygen-isotope record of lacustrine biogenic silica

Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot 76100, Israel

Gunhild Rosqvist

Department of Physical Geography, University of Stockholm, Stockholm S-106 91, Sweden

Miri Rietti-Shati

Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot 76100, Israel

Lena Rubensdotter

Department of Physical Geography, University of Stockholm, Stockholm S-106 91, Sweden

Christian Bigler

Climate Impacts Research Centre (CIRC), Abisko Naturvetenskapliga Station (ANS), Box 62, S-981 07 Abisko, Sweden

Ruth Yam

Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot 76100, Israel

Wibjörn Karlén

Department of Physical Geography, University of Stockholm, Stockholm S-106 91, Sweden

Holocene climatic variability was studied in a 9500-year lake-sediment sequence from the Abisko region in Swedish Lapland, using the oxygen-isotope ratio in diatom biogenic silica (d¹⁸O_si). Oxygen-and hydrogen-isotope ratios of waters from the Abisko area suggest that in this region the evaporative flux is small and the isotopic composition of most lakes reflects that of the local precipitation. The hydrological setting of the region and sensitivity analysis of isotopic response to changing climatic parameters such as humidity, inflow and evaporation show that the downcore diatom d¹⁸O_si record is primarily controlled by changes in the summer isotopic composition of the lake water. The overall 3.5 depletion in d¹⁸O_si since the early Holocene is interpreted as an increase in the influence of the Arctic polar continental air mass that carries depleted precipitation. We estimate that this change is associated with a 2.5–4°C cooling that has occurred since the early Holocene. In general, the diatom d¹⁸O_si record resembles the average annual air temperature reconstructed for the Greenland ice core GISP2, especially during the past 4000 years, with a pronounced cooling starting at 2000 years BP.

Key Words: Climatic change • lake sediment • diatoms • stable isotopes • oxygen-isotope ratio • biogenic silica • Scandinavia • Holocene

The Holocene, Vol. 11, No. 4, 447-454 (2001)
DOI: 10.1191/095968301678302887


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