The modulation of tropical cyclone activity in the Australian region by the Madden-Julian Oscillation

Hall, Jonty D., Matthews, Adrian J. ORCID: https://orcid.org/0000-0003-0492-1168 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.

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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 yr 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 northwest of Australia. The relationship between tropical cyclone activity and the MJO was strengthened during El Niño periods. Variations 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 Environmental Sciences
Related URLs:
Depositing User: Rosie Cullington
Date Deposited: 21 Mar 2011 10:16
Last Modified: 15 Dec 2022 01:49
URI: https://ueaeprints.uea.ac.uk/id/eprint/26329
DOI: 10.1175/1520-0493(2001)129<2970:TMOTCA>2.0.CO;2

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