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Title: Understanding the tropical cyclone Gonu
Authors: Charabi Yassine 
Najar KAA 
Salvekar PS 
Issue Date: 2010
Publisher: Indian Ocean Tropical Cyclones and Climate Change
Source: Najar, KAA and Salvekar, PS (2010) Understanding the tropical cyclone Gonu. In: Indian Ocean Tropical Cyclones and Climate Change. Springer Netherlands, pp. 359-369. ISBN 978-904813108-2
Abstract: Tropical cyclones are non-frontal synoptic-scale warm-core low-pressure systems that originate over the tropical or subtropical oceans and contain organized deep convection and a well-defined cyclonic surface wind circulation. Tropical cyclones form over warm ocean waters, which supply energy to the atmosphere in the form of latent and sensible heat. Under favorable atmospheric thermodynamical conditions associated with low-level convergence a surface low develops into a cyclonic storm. The movement of the tropical cyclone is generally known by the knowledge of the upper atmospheric conditions and the prevailing circulations. Based on intensity, tropical cyclones in the Atlantic, Eastern, and Western Pacific are classified as a tropical depression for a weaker system with V max 17 m/s (62 km/h), a tropical storm for a moderate system with 18 m/s V max 32 m/s, and a hurricane or typhoon for a strong system with V max 33 m/s. Hurricanes are called major hurricanes when V max 50 m/s and typhoons are classified as super typhoons when V max 67 m/s. The maximum wind speed of a strong tropical cyclone may exceed 100 m/s, which may produce storm surge by driving an ocean rise of several meters along the coast. On the average about five tropical cyclones occur annually over the Bay of Bengal (Bhaskar Rao DV, Ashok K (1999) in the north Indian Ocean, which contributes 6 of the global annual frequency. Based on the maximum sustained winds associated with the system and geographical location of their occurrences, they are classified as depression, tropical storm, severe cyclone, or hurricane (Asnani 1993). There are two cyclone seasons in the north Indian Ocean, viz., pre-monsoon (especially May) and post-monsoon (October and November). A few cyclones can also form in the transitional monsoon months, June and September (i.e., arrival and withdrawl phase of the Indian summer monsoon).
ISBN: 978-904813108-2
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