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Content archived on 2024-04-15

MODELLING CHANGES IN CLIMATE DUE TO ENHANCED CO2

Objective



THE DEVELOPMENT OF THE PARAMETRIZATIONS OF CLOUD DISTRIBUTION AND CLOUD OPTICAL PROPERTIES WILL BE COMPLETED. SIMULATIONS OF PRESENT DAY CLIMATE WILL BE CARRIED OUT AND COMPARED WITH OBSERVATIONAL DATA, INCLUDING DATA FROM ISCCP. SIMULATIONS FROM THE VARIOUS MODELS AT THE MET OFFICE AND LMD WILL BE COMPARED, AND, WHERE POSSIBLE, THE DIFFERENCES IN THE SIMULATIONS WILL BE EXPLAINED IN TERMS OF THE MODEL USED. THE EMPHASIS WILL BE ON COMPARING CLOUD WATER, CLOUD COVER AND RADIATIVE FLUXES SIMULATED IN THE VARIOUS MODELS, THOUGH SOME COMPARISON OF THE LOW LEVEL FLOW AND THE SURFACE FLUXES OF HEAT, MOISTURE AND MOMENTUM IN SIMULATIONS WITH PRESCRIBED SSTS WILL BE MADE. IN PLANNING EXPERIMENTS, THE COMPABILITY OF DIAGNOSTICS FROM THE MET OFFICE AND LMD WILL BE TAKEN INTO ACCOUNT.

SIMULATIONS WITH ENHANCED CO2 WILL BE MADE WITH VARIOUS MODELS. THE RESPONSES OF THE MET OFFICE AND LMD MODELS TO ENHANCED CO2 WILL BE COMPARED. THE EMPHASIS WILL BE ON UNDERSTANDING THE MODELS' RESPONSES AND EXPLAINING THE DISCREPANCIES BETWEEN THE MODELS. IN PLANNING EXPERIMENTS, THE DIAGNOSTICS REQUIRED FOR PART C. BELOW WILL BE TAKEN INTO ACCOUNT.

FUTURE CO2 EXPERIMENTS INCLUDE :

1. SIMULATIONS WITH SST CHANGES DERIVED FROM LOW RESOLUTION MIXED LAYER EXPERIMENTS.
2. SIMULATIONS USING THE HIGHER RESOLUTION MODEL COUPLED TO A MIXED LAYER OCEAN.

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Meteorological Office
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