Comparisons of radiosonde data to model profiles show that the relative coarseness of the vertical grid can lead to poorly resolved changes in thermodynamic properties. This can lead to the model underestimating cloud cover. A parametrization for area cloud fraction, compatible with a prognostic cloud scheme, is developed and tested. The parametrization is then implemented in a general circulation model and used to produce a weather forecast and a climate simulation. The simulated cloud cover is improved in both models, whilst feedbacks within the climate model lead to an improvement in the surface temperature, particularly in the Northern‐Hemisphere winter. ? Crown Copyright 2010. Published with the permission of the Controller of HMSO and the Queen's Printer for Scotland.
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