Bjerknes' hypothesis on the coldness during AD 1790-1820 revisited

  • van der Schrier G
  • Barkmeijer J
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The aim of this paper is to re-examine and quantify a hypothesis first put forward by J. Bjerknes concerning the anomalous coldness during the AD 1790–1820 period in western Europe. Central to Bjerk- nes’ hypothesis is an anomalous interaction between ocean and atmosphere studied here using an ocean- atmosphere coupled climate model of intermediate complexity. A reconstruction of the sea-level pressure pattern over the North Atlantic sector averaged over the period 1790–1820 is assimilated in this model, using a recently developed technique which has not been applied to paleoclimatic modelling before. This technique en- sures that averaged over the simulation the reconstructed pattern is retrieved whilst leaving atmospheric and cli- matic variability to develop freely. In accordance with Bjerknes’ hypothesis, the model results show anomalous southward advection of polar waters into the north- eastern North Atlantic in the winter season, lowering the sea-surface temperatures (SSTs) there with 0.3–1.0?C. This SST anomaly is persistent into the summer season. A decrease in western European winter surface air temperatures is found which can be related almost completely to advection of cold polar air. The decrease in summer surface air temperatures is related to a combination of low SSTs and anomalous atmospheric circulation. The modelled winter and summer tempera- tures in Europe compare favourably with reconstructed temperatures. Enhanced baroclinicity at the Atlantic In the original article (Climate Dynamics (2005) 24: 355-371; http:// figures 4, 7, 8, 10, 11 and 13 were unfortunately incorrect. The correct version is shown here. G. van der Schrier (&) Climatic Research Unit, UEA, Norwich, NR4 7TJ, UK E-mail: Tel.: +44-1603-592318 J. Barkmeijer Royal Netherlands Meteorological Institute (KNMI), De Bilt, NL seaboard seaboard and over Baffin Island is observed along with more variability in the position of the North Atlantic storm tracks. The zone of peak winter storm frequency is drawn to the European mid-latitudes.

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  • G. van der Schrier

  • J. Barkmeijer

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