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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 111, XXXX, DOI:10.1029/2005JD006765, Retrieving a common accumulation record from Greenland ice
 

Summary: JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 111, XXXX, DOI:10.1029/2005JD006765,
Retrieving a common accumulation record from Greenland ice
cores for the past 1800 years
K. K. Andersen, P. D. Ditlevsen, S. O. Rasmussen, H. B. Clausen, B. M. Vinther,
S. J. Johnsen and J. P. Steffensen
Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
Received 13 October 2005; revised 18 February 2006; accepted 24 April 2006.
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Abstract. In the accumulation zone of the Greenland ice sheet the annual accumula-
tion rate may be determined through identification of the annual cycle in the isotopic
climate signal and other parameters that exhibit seasonal variations. On an annual ba-
sis the accumulation rate in different Greenland ice cores is highly variable, and the de-
gree of correlation between accumulation series from different ice cores is low. However,
when using multi year averages of the different accumulation records the correlation in-
creases significantly. A statistical model has been developed to estimate the common cli-
mate signal in the different accumulation records through optimization of the ratio be-
tween the variance of the common signal and of the residual. Using this model a com-
mon Greenland accumulation record for the past 1800 years has been extracted. The record
shows significant 11.9 years periodicity. A sharp transition to very dry conditions is found
just before A. D. 1200 and very dry conditions during the 13th century together with

  

Source: Andersen, Katrine Krogh - Niels Bohr Institute for Astronomy, Physics and Geophysics, KÝbenhavns Universitets

 

Collections: Geosciences; Environmental Sciences and Ecology