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The sulphate aerosols mass and number concentration during the Indian OceanExperiment (INDOEX) Intensive Field Phase-1999 (INDOEX-IFP) has beensimulated using an interactive chemistry GCM. The model considers aninteractive scheme for feedback from chemistry to meteorology with internallyresolving microphysical properties of aerosols. In particular, theinteractive scheme has the ability to predict both particle mass and numberconcentration for the Aitken and accumulation modes as prognostic variables.  On the basis of size distribution retrieved from the observations made alongthe cruise route during IFP-1999, the model successfully simulates the orderof magnitude of aerosol number concentration. The results show the southwardmigration of minimum concentrations, which follows ITCZ (Inter TropicalConvergence Zone) migration. Sulphate surface concentration during INDOEX-IFPat Kaashidhoo (73.46° E, 4.96° N) gives an agreement within afactor of 2 to 3. The measured aerosol optical depth (AOD) from all aerosolspecies at KCO was 0.37 ± 0.11 while the model simulated sulphate AODranged from 0.05 to 0.11. As sulphate constitutes 29% of the observed AOD,the model predicted values of sulphate AOD are hence fairly close to themeasured values. The model thus has capability to predict the verticallyintegrated column sulphate burden. Furthermore, the model results indicatethat Indian contribution to the estimatedsulphate burden over India is more than 60% with values upto 40% overthe Arabian Sea

Tropospheric distribution of sulphate aerosols mass and number concentration during INDOEX-IFP and its transport over the Indian Ocean: a GCM study