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Abstract:
Rossby waves, present in both the Northern and Southern hemispheres, have a significant impact on severe weather patterns. The North Atlantic Oscillation (NAO) affects climate and weather in Europe and North America, and has been linked to extreme weather events (e.g., Hurrell et al., JC, 2003). Additionally, recurrent Rossby wave packets (RRWP) that possess strong zonal wavenumber 4 and 5 components have been associated with heatwaves in southeastern Australia (Mubashshir et al., WCD, 2022). Despite extensive research over the last century, fundamental questions regarding the nature of these high-impact Rossby waves remain unanswered. This study investigates their resonant characteristics, revealing that the NAO exhibits resonant behavior over a 35-day period, while the variability of the aforementioned RRWPs is linked to a quasi-mode (Zadra et al., JAS, 2002) resonating around 10 days. We will discuss the implications of these resonant behaviors in terms of teleconnections and forcing frequencies.
