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Palaeoclimates modelling intercomparison

Objective

To investigate the skill of present climate models to
simulate past climates, and how differences between models
are linked to the models parametrizations of climate system
processes.


THE PRESENT EC PROPOSAL IS PART OF AN INTERNATIONAL PROJECT : THE PALEOCLIMATE MODELING INTERCOMPARISON PROJECT (PMIP) WHICH IS COORDINATED BY SYLVIE JOUSSAUME AND KARL TAYLOR (LAWRENCE LIVERMORE NATIONAL LABORATORY). THE MAIN PURPOSE OF PMIP IS TO INVESTIGATE THE PHYSICAL MECHANISMS OF CLIMATE CHANGE AND HOW THEY ARE SENSITIVE TO THE PARAMETERIZATIONS USED IN THE VARIOUS CLIMATE MODELS. THIS PROJECT WAS THE MAIN CONCLUSION OF THE 1991 NATO ADVANCED RESEARCH WORKSHOP 0N ''PALEOCLIMATE MODELING'' ORGANIZED IN SACLAY BY J. JOUZEL AND S. JOUSSAUME. IT INVOLVES THE PARTICIPATION 0F A DOZEN MODELING GROUPS WORKING WITH ATMOSPHERIC GENERAL CIRCULATION MODELS (AGCMS). ITS PURPOSE IS To COMPARE PALEOCLIMATE SIMULATIONS PERFORMED WITH IDENTICAL BOUNDARY CONDITIONS (INSOLATION, ICE-SHEET DISTRIBUTION, AND C02 CONCENTRATION). TWO SPECIFIC SNAPSHOTS HAVE BEEN CHOSEN FOR INITIAL INVESTIGATION :6 000 YEARS BEFORE PRESENT (BP) WHEN SUMMER INSOLATION WAS ENHANCED IN THE NORTHERN HEMISPHERE, AND 21 000 YEARS BP, CORRESPONDING To THE LAST GLACIAL MAXIMUM.
WITHIN THE PRESENT PROPOSAL, THE FOUR EUROPEAN LABORATORIES INVOLVED IN PMIP(BREMEN UNIVERSITY WITH THE ECHAM MODEL, LMCE WITH THE LMD MODEL, UKMO & UGAMP) WILL PERFORM THE SIMULATIONS AND MODEL-MODEL COMPARISONS, AND THE LUND UNIVERSITY WILL USE A VEGETATION MODEL AS A DIAGNOSTIC TOOL TO COMPARE THE RESULTS FROM THE FOUR MODELS. TO PROMOTE MODEL-MODEL COMPARISONS, WE PROPOSE TO ORGANIZE A FIRST PMIP WORKSHOP AT THE END OF 1994 To GATHER MODELERS FROM EUROPE (THE PARTICIPANTS 0F THIS PROPOSAL) TOGETHER WITH THE PARTICIPANTS FROM UNITED STATES, CANADA, JAPAN AND AUSTRALIA. FOR MODEL-DATA COMPARISONS, WE PROPOSE TO COORDINATE THE WORK OF THE PRESENT PROPOSAL WITH THE OTHER EC PROJECTS SUPPORTING DATA WORK, BY ORGANIZING A SECOND WORKSHOP GATHERING EC MODELERS AND DATA PEOPLE TO IDENTIFY AND UNDERSTAND THE CONSISTENCIES AND INCONSISTENCIES BETWEEN MODEL RESULTS AND PALEODATA ESTIMATES.
THIS PROJECT WHICH IS THE FIRST AGCM INTERCOMPARISON FOR PALEOCLIMATE SIMULATIONS WILL CONTRIBUTE TO A BETTER KNOWLEDGE 0F THE PHYSICAL PROCESSES GOVERNING THE CLIMATE OF 6 KYR AND 21 KYR BP AND HELP To VALIDATE THE SENSIVITY OF CLIMATE MODELS FOR FUTURE CLIMATE CHANGES

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Commissariat à l'Energie Atomique (CEA)
Address
Centre D'etudes De Saclay
91191 Gif-sur-yvette
France

Participants (4)

Lunds Universitet
Sweden
Address
13,Sölvegatan
223 62 Lund
SECRETARY OF STATE FOR DEFENCE - MINISTRY OF DEFENCE
United Kingdom
Address
London Road, Sutton House Room Sg/12
RG12 2SZ Bracknell
UNIVERSITAET BREMEN
Germany
Address
Klagenfurter Strasse
28359 Bremen
UNIVERSITY OF READING
United Kingdom
Address
Earley Gate 2, Whiteknights, Palmer Building
RG6 2AU Reading / Silchester