CPD Climate of the Past Discussions CPD 1814-9359 Copernicus GmbH Göttingen, Germany 10.5194/cpd-5-1609-2009 Reconstructing past atmospheric circulation changes using oxygen isotopes in lake sediments from Sweden Jonsson C. E. 1 Andersson S. 1 Rosqvist G. C. 1 Leng M. J. 2 Department of Physical Geography and Quaternary Geology, Stockholm University, 106 91 Stockholm, Sweden NERC Isotope Geosciences Laboratory, British Geological Survey, Nottingham NG12 5GG, UK 11 06 2009 5 3 1609 1644 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.clim-past-discuss.net/5/1609/2009/cpd-5-1609-2009.html The full text article is available as a PDF file from http://www.clim-past-discuss.net/5/1609/2009/cpd-5-1609-2009.pdf

Here we use lake sediment studies from Sweden to illustrate how Holocene-aged oxygen isotope records (from lakes located in different hydrological settings) can provide information about climate change. In particular changes in precipitation, atmospheric circulation and water balance. We highlight the importance of understanding the present and past lake hydrology, and the relationship between climate parameters and the oxygen isotopic composition of precipitation (&delta;<sup>18</sup>O<sub><i>p</i></sub>) and lake waters (&delta;<sup>18</sup>O<sub>lakewater</sub>) for interpretation of the oxygen isotopic record from the sediments (&delta;<sup>18</sup>O). Both precipitation reconstructions from northern Sweden and water balance reconstructions from south and central Sweden show that the atmospheric circulation changed from zonal to a more meridional air flow over the Holocene. Superimposed on this Holocene trend are &delta;<sup>18</sup>O<sub><i>p</i></sub> minima resembling intervals of the negative phase of the North Atlantic Oscillation (NAO), thus suggesting that the climate of northern Europe is strongly influenced by atmospheric and oceanic circulation changes over the North Atlantic.

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