Were last glacial climate events simultaneous between Greenland and western Europe?
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.