Equilibrium Sensitivity of a Climate Model to an Increase in the Atmospheric CO2 Concentration Using Different Methods to Account for Cloudiness

Variations in the equilibrium sensitivity of the INM-CM4-8 climate model to a quadrupling of the CO 2 concentration are considered if changes in the cloudiness parameterization are specified in this model. It is shown that regulating the account for various mechanisms of formation and dissipation of...

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Bibliographic Details
Published in:Izvestiya. Atmospheric and oceanic physics 2021-03, Vol.57 (2), p.127-132
Main Author: Volodin, E. M.
Format: Article
Language:English
Subjects:
Atmospheric boundary layer
Atmospheric models
Boundary layers
Carbon dioxide
Carbon dioxide atmospheric concentrations
Carbon dioxide concentration
Climate
Climate models
Climatology
Cloud cover
Cloud formation
Cloudiness
Clouds
Convective clouds
Earth and Environmental Science
Earth Sciences
Equilibrium
Geophysics/Geodesy
Parameterization
Sensitivity
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Summary:Variations in the equilibrium sensitivity of the INM-CM4-8 climate model to a quadrupling of the CO 2 concentration are considered if changes in the cloudiness parameterization are specified in this model. It is shown that regulating the account for various mechanisms of formation and dissipation of cloudiness can lead to a change in the equilibrium sensitivity of the model from 3.6 to 8.1°C, which covers more than half of the range of variation in this value in the modern climate models. To do this, the mechanisms of cloudiness formation in the atmospheric boundary layer and dissipation of clouds are regulated by mixing with unsaturated surrounding air. Regulating the mechanism of convective cloud formation influences the sensitivity, but to a lesser extent.
ISSN:0001-4338
1555-628X
DOI:10.1134/S0001433821020122