Study of the variability of convective heating and moistening using Simplified Arakawa-Schubert convection scheme during INDOEX IFP-99

A single column model (SCM) is used to study the thermodynamic characterist ics of atmosphere over Indian ocean in two cases during INDOEX-99 (Sagar Ka nya cruise), The first case represents a convectively-active (cloudy) day ( 4 February) and another convectively-suppressed (fair-weather) day (8 Febru ary). The objective of this paper is to study the variability of convective heating and moistening in the above two cases using Simplified Arakawa-Sch ubert convection scheme incorporated in the single column model. Vertical p rofiles of temperature, specific humidity, wind (u, v, w), sensible and lat ent heat fluxes, temperature and moisture advective forcings were used for the initialiazation of the SCM, The first three inputs of the above variabl es were obtained from the analysed data of the TS() Global Circulation Mode l in which INDOEX data were used for the data assimilation. The large scale advective forcings were also taken from the T80 GCM over the INDOEX observ ation points. The SCM has been integrated with 15 min time step in a fully prognostic may to obtain the convective heating, moistening, convective rai nfall and cloud base mass flux for the above two dates. The results showed that the convective heating and moistening were larger on the cloudy day th an those on the fair-weather day. The distribution of hourly averaged value s of convective heating and moistening showed the existence of multiple clo ud types on the cloudy day.