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.
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