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A new convective adjustment scheme.

A new convective adjustment scheme is proposed, based on the simultaneous relaxation of temperature and moisture fields towards observed quasi-equilibrium thermodynamic structures, with a relaxation time of order two hours. Separate schemes are used for deep and shallow (non-precipitating) convection.

The schemes are tested using single-column data sets from tropical field experiments (GATE, BOMEX, ATEX) and an arctic air-mass transformation. Preliminary global forecasts show significant improvements in the global surface fluxes and mean tropical temperature tendency over the operational Kuo convection scheme.

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Betts, A. K. and M. J. Miller, 1985: A new convective adjustment scheme. ECMWF Tech. Rep. No. 43. http://www.ecmwf.int/publications/library/ecpublications/_pdf/tr/tr43.pdf