Abstract
The aim of this work was 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 from 14 to 25 October 2008. This goal was achieved through examining the behavior of the tropical cyclone tilt under vertically varying background flows in association with the cyclone development. Thus, the vertical wind shear (VWS) was estimated as one of the most important dynamical parameters related to TC formation and intensity changes. Moreover, we estimated the variations in the daily values of TOC during the period of cyclone activity. We found that the magnitude of VWS increased during the growth period, and VWS weakened during the decay period. Anomalies of daily TOC were found to reduce steadily before and during the cyclone formation, followed by an increasing trend after the dissipation of cyclone. It was also found that during the development of the tropical cyclone, an outflow developed in the upper levels, having high velocities that extended beyond the tropopause up to the lower stratosphere. As a result, the lowest value of TOC during the tropical cyclone was due to a large amount of injected water vapor from the troposphere into the stratosphere through the convection processes. This was mostly photo-dissociated into OH and atomic O by deep solar radiation in the upper and lower stratosphere, leading to a severe reduction in stratospheric ozone.
Highlights
Tropical cyclones play an important role in the stratosphere–troposphere exchange through their associated deep convection [1,2]
This paper aimed to study the variation in total ozone column amount (TOC) over the northwest Indian Ocean during the life cycle of the tropical cyclone that occurred throughout the period 14 to
The vertical wind shear was estimated to be one of the most important dynamical parameters of the largescale environment related to tropical cyclone (TC) formation, structure, and intensity changes
Summary
Tropical cyclones play an important role in the stratosphere–troposphere exchange (upward and downward transport) through their associated deep convection [1,2]. Tropical cyclones often develop with considerable shifts between the centers of the circulation at the surface and the upper level The direction of these shifts in the centers of circulation (slope or tilt) is in the direction of the convective cloud mass, which in the first stage of formation moves from the surface centers, whereas this slope decreases to become aligned vertically when the cyclone intensifies. The study was planned as follows: first, we chose the example of the tropical cyclone and studied its synoptic condition; second, we examined its development through the slope of the line connecting the center of the cyclone at different levels (vertical axis tilt) by estimating the wind shear between the levels 1000 and 100 hPa during the cyclone’s life cycle. We examined the variation in TOC during the activity of the tropical cyclone
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