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GLOBAL CLIMATE AND CO2:THE ROLE OF OCEANIC CIRCULATION

Objective

TO ENHANCE OUR UNDERSTANDING OF THE ROLE OF OCEAN CIRCULATION CHANGES IN CONTROLLING THE EQUILIBRIUM CONCENTRATION OF CARBON DIOXIDE IN THE ATMOSPHERE.

THE DATA FROM CAMBRIDGE AND GIF-SUR-YVETTE WILL CONSTITUTE AN UNIQUE DATA BASE TO COMPARE WITH THE SIMULATIONS PROVIDED BY THE HAMBURG OCEAN GCM.THE MODELLING PROJECT PLANNED BY THE M P I CONSISTS OF THE FOLLOWING ACTIVITIES:

1) COMPUTATION OF THE MEAN OCEAN CIRCULATION FOR THE VARIOUS CLIMATIC EPOCHS (18.000 B.P., LAST GLACIAL TO INTERGLACIAL TRANSITION, 125,000 B.P.) USING RECONSTRUCTED OR ASSUMED BOUNDARY VALUES AS INPUT DATA.

2) SENSITIVITY STUDIES TO DETERMINE THE SENSITIVITY OF COMPUTED OCEAN CIRCULATION STATES ON BOUNDARY VALUES (E.G. EXTENT OF SEA ICE, WIND FORCING, AIR TEMPERATURE, FRESH WATER INFLUX FROM GLACIER) AND ON PARAMETRIZATION OF PHYSICAL PROCESSES (E.G. DEEP WATER FORMATION).

3) REPEAT OF THE STUDIES (1) AND (2) WITH THE OCEAN CARBON CYCLE MODEL TO ESTIMATE EARLIER CO2 LEVELS IN THE ATMOSPHERE AND OCEAN, 13C/12C RATIOS,.....(THE M.P.I. MODEL IS BASED ON A 7 COMPONENT CARBON CHEMISTRY PLUS PHYTOPLANCTON, DETRITUS, NUTRIENT AND OXYGEN).

4) THEORITICAL AND NUMERICAL MODEL STUDIES OF THE INTERACTIONS BETWEEN ICE SHEETS, OCEAN, ATMOSPHERE AND THE CARBON CYCLE TO ASCERTAIN THE INHERENT STABILITY OR INSTABILITY OF THE COUPLED SYSTEM ON A 10 3 TO 10 5 TIME SCALE.THESE STUDIES WILL INCLUDE MILANKOVITCH AND STOCHASTIC FORCING.THE GOAL IS TO TEST VARIOUS PUBLISHED HYPOTHESIS AND POSSIBLY GAIN NEW INSIGHTS INTO THE CAUSES OF CLIMATE VARIABILITY ON THESE TIME SCALES.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

MAX PLANCK GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V.
Address
Hofgartenstrasse 8
Muenchen
Germany

Participants (2)

Centre National de la Recherche Scientifique (CNRS)
France
Address
Avenue De La Terrasse
91190 Gif-sur-yvette
UNIV OF CAMBRIDGE