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    Atypical influence of the 2007 La Nina on rainfall and temperature in southeastern Australia

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    Atypical influence of the 2007 La Nina on rainfall and temperature in southeastern Australia (355.0Kb)

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    Author
    Gallant, Ailie J. E.; Karoly, David J.
    Date
    2009
    Source Title
    Geophysical Research Letters
    Publisher
    American Geophysical Union
    University of Melbourne Author/s
    GALLANT, AILIE; Karoly, David
    Affiliation
    Science - Earth Sciences
    Metadata
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    Document Type
    Journal Article
    Citations
    Gallant, A. J. E., & Karoly, D. J. (2009). Atypical influence of the 2007 La Nina on rainfall and temperature in southeastern Australia. Geophysical Research Letters, 36, doi:10.1029/2009GL039026.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/32774
    Description

    © 2009 American Geophysical Union

    Abstract
    Interannual climate variations associated with El Niño – Southern Oscillation (ENSO) dominate rainfall and temperature variability in southeastern Australia's Murray-Darling Basin (MDB), an important region for agricultural productivity. Following a decade-long dry period, a La Niña during 2007 failed to provide above average rainfall and cool temperatures in the southern half of the MDB, typical of most La Niña events for the region. Instead, annual (winter half-year) rainfall was 17% (35%) below average and maximum temperatures 0.91°C (1.26°C) above average. Based on the past variability between La Niña events, the combined probability of such anomalies is less than 2%. It is likely that these anomalies contain some contribution from a positive Indian Ocean Dipole (IOD). However, the IOD and other large-scale circulation features are unlikely to explain the atypical conditions that occurred in the southern MDB during the 2007 La Niña.
    Keywords
    La Nina; climate variability; Australia

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