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GLOBAL CHANGES OVER THE LAST 30 THOUSANDS YEARS

Objective

To describe and model the environmental changes which occurred globally, over the North Atlantic and over the european Continent during the last 30.000 years.

The aim is to reconstruct the evolution of the Geosphere-Biosphere system in Europe and adjacent areas. The work includes:
- radiocarbon dating of continental and marine records;
- estimation of sea surface and atmospheric temperature changes;
- variations of dust, aerosols and trace gases concentration in the atmosphere (CO2, CH4);
- changes in surface and deep water circulation in the North Atlantic, phytoplankton productivity and their impact on the CO2 cycle;
- vegetation changes over Europe and their impact on the carbon storage in continental areas.
A strong effort will be made to derive quantitative estimates of the climatic parameters used in models from the geological data. All the obtained data will be used either as input or as check of output of models simulating the transient behaviour of the climate system over the last 30.000 years. A hierarchy of models will be used: simple geochemical models, 2D and 3D circulation models of the coupled atmosphere, ocean, cryosphere system.
A special attention will be paid to the Younger Dryas cold event (11.000 to 10.000 Years Before Present), which disrupts a smooth transition from glacial to interglacial. It is strong evidence of the climatic system's non-linear response to insolation forcing, for whilst insolation increases continuously, full glacial conditions returned temporarily to the North Atlantic for about 1.000 years. It is hoped that modelling will identify the detailed physical processes responsible for the tempo of deglaciation and the Younger Dryas event.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Centre National de la Recherche Scientifique (CNRS)
Address
Avenue De La Terrasse
91198 Gif-sur-yvette
France

Participants (10)

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
France
Address
Rue Molière 54, Université De Grenoble 1
38402 Saint-martin-d'heres
Christian-Albrechts-Universität Kiel
Germany
Address
Olshausenstraße 40-60
24118 Kiel
MAX-PLANCK-GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V.
Germany
Address
Bundesstra¯e 55
20146 Hamburg
THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF CAMBRIDGE
United Kingdom
Address
Trinity Lane, The Old Schools,
CB2 1TN Cambridge
UNIVERSITAET HOHENHEIM
Germany
Address
Schloss 1
70599 Stuttgart
UNIVERSITE CATHOLIQUE DE LOUVAIN
Belgium
Address
Place De L'universite 1
Louvain-la-neuve
UNIVERSITE DE BORDEAUX I
France
Address
Cours De La Libération 351
33405 Talence
UNIVERSITY OF DURHAM
United Kingdom
Address
Old Shire Hall, Old Elvet
DH1 3HP Durham
University of Bristol
United Kingdom
Address
Senate House Tyndall Avenue
BS8 1TH Bristol
Université d'Aix-Marseille III (Université de Droit d'Économie et des Sciences)
France
Address
3 Avenue Robert Schuman
13628 Aix-en-provence