THE ROLE OF A DEEP CONVECTIVE STORM OVER THE TROPICAL PACIFIC-OCEAN IN THE REDISTRIBUTION OF ATMOSPHERIC CHEMICAL-SPECIES

A deep convective storm observed during the Central Equatorial Pacific Experiment (CEPEX) has been simulated using the two-dimensional version of a three-dimensional cloud dynamics, microphysics, and chemistry model. The simulated storm is characterized by the penetration of the cloud tower into the lower stratosphere and by a widespread cloud anvil. Clear evidence of vertical transport of water vapor through the convective turret to the upper troposphere has been found. A large amount of small ice crystals formed in; the cloud top and in the anvil together with graupels induced by frozen raindrops. Intense mixing of boundary layer air into the cloud caused by the deep convection can result in low ozone area inside the cloud turret and inside the anvil. However, simultaneously, stratospheric air with high ozone volume mixing ratio was brought into the cloud region in the troposphere, especially in the upper part of the anvil, which could play a significant role in the tropical tropospheric O-3 budget. Due to the deep convection, a significant fraction of boundary layer dimethyl sulfide (DMS) or other ocean-derived chemicals is also transferred to the free troposphere, but we find no evidence for significant transport to the stratosphere.