EGU2020-3951
https://doi.org/10.5194/egusphere-egu2020-3951
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

On the Resonances and Teleconnections of the North Atlantic and Madden-Julian Oscillations

Gilbert Brunet1, Yosvany Martinez2, Hai Lin2, and Natacha Bernier2
Gilbert Brunet et al.
  • 1Bureau of Meteorology, Melbourne, Australia.
  • 2Environment Canada, Dorval, Canada.

The key to better prediction of S2S variability and weather regimes in a changing climate lies with improved understanding of the fundamental nature of S2S phase space structure and associated predictability and dynamical processes. The latter can be decomposed into a finite number of relatively large-scale discrete-like Rossby waves with coherent space-time characteristics using Empirical Normal Mode (ENM) analysis. ENM analysis is based on principal component analysis, conservation laws and normal mode theories. These modes evolve in a complex manner through nonlinear interactions with themselves and transient eddies and weak dissipative processes. Within this atmospheric dynamic framework, we will discuss the teleconnections and the 35-day wave resonance of the North Atlantic Oscillation using recent diagnostics and numerical experiments.

References

Brunet, G. and J. Methven, 2018: Identifying wave processes associated with predictability across time scales: An empirical normal mode approach. Book chapter in Sub-seasonal to seasonal prediction: The gap between weather and climate forecasting. Editors A.W. Robertson and F. Vitart, Elsevier. p.1-42

Brunet, G. 1994:  Empirical normal mode analysis of atmospheric data. J. Atmos. Sci., 51, 932-952.

Lin, H., G. Brunet, and J. Derome, 2009: An observed connection between the North Atlantic Oscillation and the Madden-Julian Oscillation.  J. Climate, 22, 364-380.

Lin, H., G. Brunet and J. Derome 2007: Intraseasonal Variability in a Dry Atmospheric Model, J. Atmos. Sci., 64, 2442-2441.

How to cite: Brunet, G., Martinez, Y., Lin, H., and Bernier, N.: On the Resonances and Teleconnections of the North Atlantic and Madden-Julian Oscillations, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-3951, https://doi.org/10.5194/egusphere-egu2020-3951, 2020

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