Abstract
This paper aimed to study the variation in the total ozone column amount
(TOC) during the life cycle of the tropical cyclone (TC) that occurred
over the northwest Indian Ocean in October 2008. The characteristics of
TC tilts with vertically varying background flows were inspected
preliminarily also in the current study. The vertical wind shear (VWS)
was estimated as one of the most important dynamical parameters of the
large-scale environment related to TC formation, structure, and
intensity changes. It is found that the magnitude of VWS increased
during the growth period, meanwhile, VWS weakened during the decay
period. Anomalies of daily TOC have been calculated and found related to
the strengthening of the cyclonic system. During the development of the
tropical cyclone, an outflow develops in the upper levels with high
velocities that can extend beyond tropopause up to the lower
stratosphere. As a result, the lowest value of TOC during the tropical
cyclone was owing to a large amount of injected water vapor from the
troposphere into the stratosphere through the convection processes which
was mostly photo-dissociated into OH plus atomic O by deep solar
radiation in the upper and lower stratosphere leading to severe
reduction of stratospheric ozone