http://www.ncdc.noaa.gov/cdo/f?p=519:1:::::P1_study_id:8656

ONLINE RESOURCE (When Citing Data):
http://www.ncdc.noaa.gov/paleo/study/8656

CITATION INFORMATION (ORIGINAL REFERENCE):

Brauer, A., Haug, G.H., Dulski, P., Sigman, D.M., Negendank, J.F.W. 2008. An
abrupt wind shift in western Europe at the onset of the Younger Dryas cold
period. Nature Geoscience, 1, 520-523.

SUMMARY/ABSTRACT: The Younger Dryas cooling 12,700 years ago is one of the
most abrupt climate changes observed in Northern Hemisphere palaeoclimate
records. Annually laminated lake sediments are ideally suited to record the
dynamics of such abrupt changes, as the seasonal deposition responds
immediately to climate, and the varve counts provide an accurate estimate of
the timing of the change. Here, we present sub-annual records of varve
microfacies and geochemistry from Lake Meerfelder Maar in western Germany,
providing one of the best dated records of this climate transition. Our data
indicate an abrupt increase in storminess during the autumn to spring
seasons, occurring from one year to the next at 12,679 yr BP, broadly
coincident with other changes in this region. We suggest that this shift in
wind strength represents an abrupt change in the North Atlantic westerlies
towards a stronger and more zonal jet. Changes in meridional overturning
circulation alone cannot fully explain the changes in European climate; we
suggest the observed wind shift provides the mechanism for the strong
temporal link between North Atlantic Ocean overturning circulation and
European climate during deglaciation.


STUDY NOTES:

Varve thickness and iron content data for Lake Meerfelder Maar, western
Germany, across the Younger Dryas cold interval at sub-annual resolution.

** Note by FZ (Jun 16,2015): FeK data (measured over a period of only 50 years) seem to show 
a break point at about 12677.7 BP (10727.7; ~10730 AD): Fe counts/sec change
abruptively from about 2000 to about 3000. Also the slope change from
negative (before break point) to positive (after break point) value.
Another jump appears in the Fe counts before 12660 BP (10710 AD); its amount
may be about 700  counts/sec (1300 to 2000). If the Younger Dry is quoted to
be started at 12700 yrs BP, fek-fit plots can give a more precise starting 
date at 12677.7 BP (10727 AD).
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fz 14.5.15