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SUMMARY:ENSO teleconnections to the Southern Hemisphere and impacts on wea
 ther systems - Zoe Gillett\, University of New South Wales/DAMTP
DTSTART:20231120T130000Z
DTEND:20231120T140000Z
UID:TALK207868@talks.cam.ac.uk
CONTACT:9780
DESCRIPTION:The El Niño-Southern Oscillation (ENSO) drives stationary Ros
 sby waves that play an important role in Southern Hemisphere weather and c
 limate\, including promoting Australian rainfall variability. However\, th
 e development of these teleconnection patterns\, typically shown on a seas
 onal timescale\, and their interactions with synoptic weather systems are 
 not fully understood. In this seminar\, I will explore the mechanisms invo
 lved in the establishment of ENSO teleconnections in the Southern Hemisphe
 re and their impacts on weather systems. In the first part\, I will examin
 e the mechanisms behind the asymmetric extratropical height response to we
 stward-located and eastward-located ENSO heating using a set of large-ense
 mble experiments with prescribed equatorial diabatic heating anomalies. Th
 e relative importance of non-linear effects will be assessed by contrastin
 g the comprehensive experiments with results from a simple linear model. I
 n the second part\, I will link changes in the large-scale atmospheric cir
 culation during ENSO events to rain-producing synoptic weather systems in 
 eastern Australia\, thereby refining our understanding of how ENSO actuall
 y influences the weather.  
LOCATION:MR5\, CMS
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