Influence of climate modes on tropical cyclone formation in the Australian region

Angelika Werner

    Research output: Contribution to journalConference paper

    Abstract

    Relationships between tropical cyclogenesis (TCG) in the Australian region and modes of various atmospheric and oceanic parameters are investigated for the period 1968-2006. Seven thermal and seven dynamic variables describing the state of moisture transport and wind flow patterns in the atmosphere were analysed. In order to identify the dominant modes of each variable, an empirical orthogonal function (EOF) is applied. The three leading modes of each variable were then considered. This study corroborates previous work showing that El Nino-Southern Oscillation (ENSO) is the leading contributor to TCG in the all-Australian, Western and Eastern Australian regions. The ENSO-linked first EOF of the streamfunction at ? level 0.2101 shows the strongest relationship with TCG variations in the all-Australian and Eastern regions correlating at 0.73 and 0.62, respectively. In the western Australian region, the first EOF of environmental vertical wind shear shows the strongest skill. TCG frequency in the Northern region is mainly affected by the large-scale wind patterns of the subtropics and id-latitudes such as the subtropical jet and the Rossby wave train.
    Original languageEnglish
    Pages (from-to)012014-1-012014-7
    Number of pages7
    JournalIOP Conference Series: Earth and Environmental Science
    DOIs
    Publication statusPublished - 2010
    Event17th National Conference of the Australian Meteorological and Oceanographic Society - Canberra, Australia
    Duration: 27 Jan 201029 Jan 2010

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