Dodla, V. Bhaskar Rao (Department of Meteorology nd Oceanography, Andhra University, Visakhapatnam, India)
Surireddi, SVS Ramakrishna (same affiliation)
An axi-symmetric primitive equation model in z-coordinate system has been designed to study the evolution of the vortex into a cyclonic system. With three different convective schemes of Arakawa-Schubert (1974), Greil (1991) and Emmanuel (1991). The initial potential temperature, correspond to the Jordan (1958) data. A perturbation in the potential temperature has been introduced in the central 200 km to yield a weak balanced vortex with a maximum tangential velocity of 8 m/sec at 128 km level. The initial radial wind is zero and the specific humidity field is uniform horizontally. Deadorff (1972) PBL has been introduced to calculate the ocean- atmosphere interaction. The model integration has been performed up to 240 hr and the evolution of the vortex is examined using the three convective schemes. All the three schemes clearly indicate the evolution of a cyclonic system with slightly different intensities. The significant differences of the three experiments are discussed.