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Simulation of hurricane-type vortices in a general circulation model Cover

Simulation of hurricane-type vortices in a general circulation model

Open Access
|Jan 1982

Abstract

A study of intense hurricane-type vortices in the ECMWF operational model is reported. These vortices develop around day 4 in the forecast and occur in the tropical belt in areas and at times where intense tropical cyclones normally occur. The frequency resembles that observed over most tropical regions with a pronounced maximum in the western North Pacific. The life time of the vortices and their 3-dimensional structure agree in some fundamental way with observations although, because of the resolution, the systems are less intense than the observed ones. The general large-scale conditions for active and inactive cyclone periods are discussed. The model cyclones are sensitive to the sea-surface temperature and do not develop with sea surface temperatures lower than 28–29°C. The dynamical conditions favouring cyclone development are characterized by intense large-scale divergence in the upper troposphere. Cyclogenesis appears to take place when these conditions are found outside the equatorial zone and over oceans where the water is sufficiently warm.

Language: English
Page range: 440 - 457
Submitted on: Jul 27, 1981
Accepted on: Dec 29, 1981
Published on: Jan 1, 1982
Published by: Stockholm University Press
In partnership with: Paradigm Publishing Services

© 1982 L. Bengtsson, H. Böttger, M. Kanamitsu, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.