EGU2020-5168
https://doi.org/10.5194/egusphere-egu2020-5168
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Are Recurrent Rossby wave packets linked to persistent extreme weather events in the Southern Hemisphere?

Syed Mubashshir Ali1, Olivia Martius1,2, and Matthias Röthlisberger3
Syed Mubashshir Ali et al.
  • 1Institute of Geography and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland (mubashshir.ali@giub.unibe.ch)
  • 2Mobiliar Lab for Natural Risks, Bern, Switzerland
  • 3Institute for Atmospheric and Climate Science, ETH Zürich, Zürich, Switzerland

Synoptic-scale Rossby wave-packets have a recurrent pattern during several episodes of persistent surface weather which is termed as 'recurrent Rossby wave-packets' (RRWP). They result in a statistically significant increase in winter cold and summer hot spells over large areas of the Northern Hemisphere mid-latitudes.

We present a global climatology of the RRWPs to study its spatial and seasonal variation. We also investigate the link of RRWPs to persistent surface extremes in the Southern Hemisphere (SH).  We find that RRWPs result in a statistically significant increase in winter cold and summer hot spells over broad areas in Australia and South America. Furthermore, we discuss the effects of climatological oscillations (Madden Julian Oscillation, ENSO, etc) on influencing the RRWPs.

How to cite: Ali, S. M., Martius, O., and Röthlisberger, M.: Are Recurrent Rossby wave packets linked to persistent extreme weather events in the Southern Hemisphere?, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-5168, https://doi.org/10.5194/egusphere-egu2020-5168, 2020

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