Reconstructing Large-scale Variability from Palaeoclimatic Evidence by Means of Data Assimilation Through Upscaling and

This chapter describes a newly developed approach for extracting the climate signal from proxy records, termed DATUN (Data Assimilation Through Upscaling and Nudging).

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Springer-Verlag Berlin Heidelberg GmbH

Hubertus Fischer • Thomas Kumke • Gerrit Lohmann • G6tz Fl6ser • Heinrich Miller • Hans von Storch • J6rg EW. Negendank (Editors)

The Climate in Historical Times Towards a Synthesis of Holocene Proxy Data and Climate Models With 166 Figures, 13 in Colour, and

Springer

11

Tables

Volume editors: DR. HUBERTUS FISCHER PROFESSOR DR. HEINRICH MILLER

Alfred Wegener Institute for Polar ;ild lVIarine Research Columbllsstrasse 27568 Bremerhaven, Germany DR. GERRlT LOH1VlANN

University of Bremen Geoscience Department Klagenfurter Strasse 28359 Bremen, Germany PROFESSOR DR. JORG

DR. THOMAS KUMKE

Alfred Wegener Institute for Polar and Marine Research Telegrafenberg, HallS A43 14473 Potsdam, Germany

DR. GOTZ FLbsER PROFESSOR DR. HANS VON STORCH

GKSS Research Centre lVlax-Planck-Strasse 1 21502 Geesthacht, Germany

EW. NEGENDANK

GeoF OrSChlll1gsZentrllm Potsdam Telegrafenberg, Halls C 14473 Potsdam, Germany

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Preface

An Introduction to the KIHZ Project The description of the climate system and the quantification of its natural variability and dynamics is essential to assess an ongoing anthropogenic climate change and to validate climate and biogeochemical models to allow for reliable projections into the future. Because the spatio-temporal coverage of direct meteorological observations is rather limited, high-resolution and absolutely dated climate archives represent the only key to a quantification of seasonal to millenia