La Niña Modoki impacts Australia autumn rainfall variability
Article
Article Title | La Niña Modoki impacts Australia autumn rainfall variability |
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ERA Journal ID | 1874 |
Article Category | Article |
Authors | Cai, W. and Cowan, T. |
Journal Title | Geophysical Research Letters |
Journal Citation | 36 (12) |
Number of Pages | 4 |
Year | 2009 |
Publisher | John Wiley & Sons |
ISSN | 0094-8276 |
1944-8007 | |
Digital Object Identifier (DOI) | https://doi.org/10.1029/2009GL037885 |
Web Address (URL) | https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2009GL037885 |
Abstract | [1] Both El Niño-Southern Oscillation (ENSO) and ENSO Modoki affect Australian rainfall but the commonalities and contrasts of their impacts have not been fully explored. We show that both types feature a strong asymmetry between impacts of La Niña and El Niño in austral autumn (March–May); the La Niña-Australian rainfall teleconnection is statistically significant, whereas the El Niño-Australian rainfall relationship is not. A La Niña Modoki cold anomaly near the Dateline is effective in shifting convection westward, causing an autumn rainfall increase over northwestern Australia extending to the northern Murray-Darling Basin, rather than over the east as in a conventional La Niña. During an El Niño Modoki, the tendency for lower Australian rainfall is far weaker. The asymmetry explains the strong inter-ENSO variations in rainfall anomalies, including 1983, when a strong El Niño residual was associated with a wet autumn. Our results highlight the importance of considering the influence from La Niña Modoki in predicting ENSO's impacts. |
ANZSRC Field of Research 2020 | 370202. Climatology |
370105. Atmospheric dynamics | |
370803. Physical oceanography | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia |
https://research.usq.edu.au/item/z09v5/la-ni-a-modoki-impacts-australia-autumn-rainfall-variability
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