Were last glacial climate events simultaneous between Greenland and western Europe? M. Blaauw1, B. Wohlfarth2, J. A. Christen3, L. Ampel4, D. Veres4,*, K. A. Hughen5, F. Preusser6, and A. Svensson7 1School of Geography, Archaeology and Palaeoecology, Queen's University Belfast, UK 2Department of Geology and Geochemistry, Stockholm University, Sweden 3Centro de Investigación en Matemáticas CIMAT, Guanajuato, Mexico 4Department of Physical Geography and Quaternary Geology, Stockholm University, Sweden 5Woods Hole Oceanographic Institution, MA, USA 6Institute for Geology, Bern University, Switzerland 7Ice and Climate Research, Niels Bohr Institute, Univ. of Copenhagen, Copenhagen, Denmark *now at: "Emil Racovita" Institute of Speleology, Cluj-Napoca, Romania
Abstract. During the last glacial period, several large abrupt climate fluctuations
took place on the Greenland ice cap and elsewhere. Often these
Dansgaard/Oeschger events are assumed to have been synchronous, and then used
as tie-points to link chronologies between the proxy archives. However, if
temporally separate events are lumped into one illusionary event, climatic
interpretations of the tuned events will obviously be flawed. Here, we
compare Dansgaard/Oeschger-type events in a well-dated record from
south-eastern France with those in Greenland ice cores. Instead of assuming
simultaneous climate events between both archives, we keep their age models
independent. Even these well-dated archives possess large chronological
uncertainties, that prevent us from inferring synchronous climate events at
decadal to multi-centennial time scales. If possible, tuning of proxy
archives should be avoided.
Citation: Blaauw, M., Wohlfarth, B., Christen, J. A., Ampel, L., Veres, D., Hughen, K. A., Preusser, F., and Svensson, A.: Were last glacial climate events simultaneous between Greenland and western Europe?, Clim. Past Discuss., 4, 1203-1217, doi:10.5194/cpd-4-1203-2008, 2008.