The Influence of Interannual and Decadal Indo-Pacific Sea Surface Temperature Variability on Australian Monsoon Rainfall
Article
Article Title | The Influence of Interannual and Decadal Indo-Pacific Sea Surface Temperature Variability on Australian Monsoon Rainfall |
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ERA Journal ID | 1978 |
Article Category | Article |
Authors | Heidemann, Hanna (Author), Ribbe, Joachim (Author), Cowan, Tim (Author), Henley, Benjamin J. (Author), Pudmenzky, Christa (Author), Stone, Roger (Author) and Cobon, David H. (Author) |
Journal Title | Journal of Climate |
Journal Citation | 35 (1), pp. 425-444 |
Number of Pages | 20 |
Year | 2022 |
Publisher | American Meteorological Society |
Place of Publication | United States |
ISSN | 0894-8755 |
1520-0442 | |
Digital Object Identifier (DOI) | https://doi.org/10.1175/JCLI-D-21-0264.1 |
Web Address (URL) | https://journals.ametsoc.org/view/journals/clim/35/1/JCLI-D-21-0264.1.xml |
Abstract | Monsoonal rainfall in northern Australia (AUMR) varies substantially on interannual, decadal, and longer time scales, profoundly impacting natural systems and agricultural communities. Some of this variability arises in response to sea surface temperature (SST) variability in the Indo-Pacific linked to both El Niño–Southern Oscillation (ENSO) and the interdecadal Pacific oscillation (IPO). Here we use observations to investigate unresolved issues regarding the influence of the IPO and ENSO on AUMR. Specifically, we show that during negative IPO phases, central Pacific (CP) El Niño events are associated with below-average rainfall over northeast Australia, an anomalous anticyclonic pattern to the northwest of Australia, and eastward moisture advection toward the date line. In contrast, CP La Niña events (distinct from eastern Pacific La Niña events) during negative IPO phases drive significantly wet conditions over much of northern Australia, a strengthened Walker circulation, and large-scale moisture flux convergence. During positive IPO phases, the impact of CP El Niño and CP La Niña events on AUMR is weaker. The influence of central Pacific SSTs on AUMR has been stronger during the recent (post-1999) negative IPO phase. The extent to which this strengthening is associated with climate change or merely natural internal variability is not known. |
Keywords | Australia; Atmosphere-ocean interaction; ENSO; Monsoons; Pacific decadal oscillation; Rainfall; Sea surface temperature; Climate variability; Decadal variability |
Related Output | |
Is part of | Interannual and decadal variability of Australian monsoon rainfall and variability in the Pacific Ocean |
ANZSRC Field of Research 2020 | 370202. Climatology |
Public Notes | This article is part of a UniSQ Thesis by publication. See Related Output. |
Byline Affiliations | Centre for Applied Climate Sciences |
School of Sciences | |
Monash University | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6yvx/the-influence-of-interannual-and-decadal-indo-pacific-sea-surface-temperature-variability-on-australian-monsoon-rainfall
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