The combined influence of the Madden-Julian Oscillation and El Niño-Southern Oscillation on Australian rainfall and temperature
Keynote
Paper/Presentation Title | The combined influence of the Madden-Julian Oscillation and El Niño-Southern Oscillation on Australian rainfall and temperature |
---|---|
Presentation Type | Keynote |
Authors | Cowan, T., Wheeler, M. and Marshall, A. |
Conference/Event | 29th Annual Conference of the Australian Meteorological and Oceanographic Society |
Event Details | 29th Annual Conference of the Australian Meteorological and Oceanographic Society Delivery Online Event Date 28 Nov 2022 to end of 01 Dec 2022 Event Location Adelaide Event Venue Adelaide Convention Centre Event Web Address (URL) |
Abstract | Australia's interannual climate is strongly linked with modes like El Niño-Southern Oscillation (ENSO), while on intraseasonal timescales, the Madden-Julian Oscillation (MJO) can increase the likelihood of wet or dry conditions. Knowing how the MJO can influence the weekly weather can be advantageous to users of multi-week climate outlooks. Coinciding with the Bureau of Meteorology's update to its Tropical Monitoring webpage, we investigate the joint ENSO and MJO influence on temperature and rainfall across Australia. During the El Niño years, the dry MJO phases 8, 1 and 2 in summer decrease the chances of above median weekly rainfall probabilities to around 25% in the Top End, compared to ~35% in La Niña and neutral ENSO years. For MJO phase 8, this coincides with warm daytime temperature anomalies exceeding 2°C in the tropical north. The chances of increased summer rainfall in wet MJO phase 5 appears unaffected by the state of ENSO, and there are only marginally differences in phase 6 between El Niño and La Niña years. The largest El Niño/ La Niña contrast for rainfall occurs in spring over eastern Australia, suggesting ENSO has a far greater control than the MJO in that season. Similar contrasts between El Niño and La Niña are seen in spring and winter temperatures, with El Niño enhancing spring maximum temperatures across southern Australian in MJO phase 3 and driving cooler winter minimums throughout southern Queensland in phase 7. This research highlights both the spatial and temporal intricacies of ENSO and MJO teleconnections. |
ANZSRC Field of Research 2020 | 370105. Atmospheric dynamics |
370108. Meteorology | |
370109. Tropospheric and stratospheric physics | |
Byline Affiliations | Centre for Applied Climate Sciences (Research) |
Australian Bureau of Meteorology |
https://research.usq.edu.au/item/zyyzv/the-combined-influence-of-the-madden-julian-oscillation-and-el-ni-o-southern-oscillation-on-australian-rainfall-and-temperature
0
total views0
total downloads0
views this month0
downloads this month