Atypical influence of the 2007 La Nina on rainfall and temperature in southeastern Australia
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Author
Gallant, Ailie J. E.; Karoly, David J.Date
2009Source Title
Geophysical Research LettersPublisher
American Geophysical UnionAffiliation
Science - Earth SciencesMetadata
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Journal ArticleCitations
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 AccessDescription
© 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; AustraliaExport Reference in RIS Format
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