Analysis of the dynamism and Hazards of Nilofar Tropical Storm

Document Type : Research Article

Authors

1 Assistance Professor, Tarbiat Modares University

2 Ph.D. student in Climatology, Tarbiat Modares University

3 Associated Professor, Tarbiat Modares University

Abstract

Tropical storm is a one of the major hazards that threat the southern coastal zones of Iran. Understanding of such hazards and knowledge of the time of their occurrence could be useful in the management of accidents caused by them. The aim of this study is analysis of the dynamism and hazards of recent tropical storm formed over the Arabian Sea is known as the Hurricane Nilofar. The data used include re-analyzed data of SLP (Sea Level Pressure), Geopotential Height, wind (U and V components), Omega, specific humidity, CAPE (Convective Available Potential Energy), Vorticity advection and SST (Sea Surface Temperature) for Nilofar storm activity in end days of October 2014 obtained and plotted than were analyzed. The results showed that the depth of the trough level of 500 mb with the axis southwest - northeast, creates a cut of low on 25 and 26 October on the Arabian Sea that following the practice causing a divergence in the eastern side of the cut of low on level of 500 mb and creating a strong convergence zone in the lower levels of the atmosphere and on the surface of the sea. Eastward movement of trough on third day of the formation of hurricanes and out of the activity storm, also, its change the mechanism of action following the availability of energy from the ocean surface (conversion of thermal energy into mechanical) to strengthen the updraft and downdraft currents on the wall of the eye and eye of storm has helped, as of this day and the next day the storm activity, increase speed to low level jet stream than the upper levels of atmosphere, causing the energy source the storm is chanced from upper levels to the lower levels of the atmosphere, also the interaction of tongues and anticyclonic centers located on the Arabian Sea, direction and movement of the storm has created to overturn it on 31 October.

Keywords

References

 
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