(
2009-03)
Blaauw, Maarten; Wohlfarth, Barbara; Christen, J. Andres; Ampel, Linda; Veres, Daniel; Hughen, Konrad A.; Preusser, Frank; Svensson, Anders
Several large abrupt climate fluctuations during the last glacial have been recorded in Greenland ice
cores and archives from other regions. Often these Dansgaard-Oeschger
events are assumed to have
been synchronous over wide areas, and then used as tie-points
to link chronologies between the proxy
archives. However, it has not yet been tested independently whether or not these events were indeed
synchronous over large areas. Here, we compare Dansgaard-Oeschgertype
events in a well-dated
record
from southeastern
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, comparisons between proxy archives should be
based on independent, non-tuned
time-scales.
