The Modulation of Tropical Cyclone Activity in the Australian Region by the Madden–Julian Oscillation

Hall, Jonty D., Matthews, Adrian J. and Karoly, David J. (2001) The Modulation of Tropical Cyclone Activity in the Australian Region by the Madden–Julian Oscillation. Monthly Weather Review, 129 (12). pp. 2970-2982. ISSN 0027-0644

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Abstract

The observed relationship between tropical cyclone activity in the Australian region and the Madden-Julian Oscillation (MJO) has been examined using 20 years of outgoing longwave radiation, NCEP-NCAR reanalysis and best track tropical cyclone data. The MJO strongly modulates the climatological pattern of cyclogenesis in the Australian region, where significantly more (fewer) cyclones form in the active (inactive) phase of the MJO. This modulation is more pronounced to the north-west of Australia. The relationship between tropical cyclone activity and the MJO was strengthened during El Nino periods. Variation of the large-scale dynamical conditions necessary for cyclogenesis were explored, and it was found that MJO-induced perturbations of these parameters correspond with the observed variation in cyclone activity. In particular, 850-hPa relative vorticity anomalies attributable to the MJO were found to be an excellent diagnostic of the changes in the large-scale cyclogenesis patterns.

Item Type: Article
Faculty \ School: Faculty of Science > School of Mathematics
Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: Vishal Gautam
Date Deposited: 18 Mar 2011 14:52
Last Modified: 21 Apr 2020 21:00
URI: https://ueaeprints.uea.ac.uk/id/eprint/20940
DOI: 10.1175/1520-0493(2001)129<2970:TMOTCA>2.0.CO;2

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