Central Pacific El Niño as a precursor to summer drought-breaking rainfall over southeastern Australia
Article
Article Title | Central Pacific El Niño as a precursor to summer drought-breaking rainfall over southeastern Australia |
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ERA Journal ID | 1874 |
Article Category | Article |
Authors | Freund, Mandy B., Marshall, Andrew G., Wheeler, Matthew C. and Brown, Jaclyn N. |
Journal Title | Geophysical Research Letters |
Journal Citation | 48 (7) |
Article Number | e2020GL091131 |
Number of Pages | 9 |
Year | 2021 |
Publisher | John Wiley & Sons |
Place of Publication | United States |
ISSN | 0094-8276 |
1944-8007 | |
Digital Object Identifier (DOI) | https://doi.org/10.1029/2020GL091131 |
Web Address (URL) | https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020GL091131 |
Abstract | Using an extended 120-year record of El Niño events, we distinguish between central Pacific (CP) and eastern Pacific (EP) types to show that the strength of CP events is a factor in the amplitude and sign of the impact on rainfall over southeastern Australia. Both weak and strong CP events cause widespread rainfall deficits in Australia during the onset phase from April to September. However, this relationship reverses over southeastern Australia including the Murray Darling Basin river catchment region for the strongest CP events after October, leading to positive rainfall anomalies during the mature phase of strong CP El Niños. This reversal can be explained by a change in the circulation over eastern Australia from drier, more westerly orientated flow to moister, more easterly onshore flow. These findings may help with seasonal prediction efforts to predict drought-breaking rain such as occurred in early 2020. |
Keywords | El Niño |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 370105. Atmospheric dynamics |
Public Notes | The accessible file is the accepted version of the paper. Please refer to the URL for the published version. |
Byline Affiliations | Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia |
Australian Bureau of Meteorology |
https://research.usq.edu.au/item/zz60x/central-pacific-el-ni-o-as-a-precursor-to-summer-drought-breaking-rainfall-over-southeastern-australia
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