Jayanti Pal, Department of Atmospheric Sciences, University of Calcutta, Kolkata- 700 019, INDIA;Department of Atmospheric Sciences, Central University of Rajasthan, Rajasthan - 305817, INDIA

Ishita Sarkar, Department of Atmospheric Sciences, University of Calcutta, Kolkata- 700 019, INDIA

Indrani Ganguly, Department of Atmospheric Sciences, University of Calcutta, Kolkata- 700 019, INDIA;Department of Geological and Atmospheric Sciences, Iowa State University, Ames, Iowa 50011-3212, USA

Abstract
An attempt is made to perceive the dynamics for track evolution process of tropical cyclones over Bay of Bengal (BOB) by merging the satellite retrievals and reanalyses datasets. The systems investigated are the cyclonic storms KYANT, NADA and MAARUTHA belonging to the same category with different tracks. The cyclonic storm KYANT had looping track and had no landfall. However, NADA had westward track with landfall at southeast coast of India. The cyclonic storm MAARUTHA, on the other hand, had an eastward track with landfall over Myanmar. The analyses depict that the cloud clusters developed under different surface currents for the three systems. The result shows that the cloud clusters initially developed under surface westerly current for MAARUTHA. A tilt in vertical profile of vorticity is observed with the track of KYANT and NADA while no such tilt is observed for MAARUTHA. The upper level divergence field is observed for NADA and MAARUTHA however, the divergence field in upper level was not discernible for KYANT. The result shows that the dynamics of the track evolution process for each system over the same ocean basin is rather different albeit the systems belong to the same category. Thus, the simulation of the track of cyclonic systems of the same category over a specific ocean basin with a single numerical model may not disseminate dependable information unless the surface current at the initial stage, vertical profile of vorticity and upper level divergence for each system are analysed and assimilated in the model correctly.

Keywords
Cyclonic Storm, track evolution process, Scatterometer, wind structure

Cite this paper
Sutapa Chaudhuri, Jayanti Pal, Ishita Sarkar, Indrani Ganguly, Satellite - based Tropical Cyclone Track Assessment over Bay of Bengal using the GRIDSAT- B1 and SCATSAT- 1 retrievals and reanalysis data , SCIREA Journal of Geosciences. Volume 4, Issue 1, February 2020 | PP. 15-49.

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