Circumglobal Rossby wave patterns during boreal winter highlighted by space–time spectral analysis

Riboldi, Jacopo; Rousi, Efi; D'Andrea, Fabio; Rivière, Gwendal; Lott, François

doi:https://doi.org/10.5194/wcd-3-449-2022

Articles | Volume 3, issue 2

https://doi.org/10.5194/wcd-3-449-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/wcd-3-449-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 3, issue 2

Research article

|

08 Apr 2022

Research article |

| 08 Apr 2022

Circumglobal Rossby wave patterns during boreal winter highlighted by space–time spectral analysis

Jacopo Riboldi, Efi Rousi, Fabio D'Andrea, Gwendal Rivière, and François Lott

Supplement

https://doi.org/10.5194/wcd-3-449-2022-supplement

Data sets

The ERA-Interim reanalysis dataset European Centre for Medium-range Weather Forecast (ECMWF) https://www.ecmwf.int/en/forecasts/datasets/archive-datasets/reanalysis-datasets/era-interim

An All-Season Real-Time Multivariate MJO Index: Development of an Index for Monitoring and Prediction (http://www.bom.gov.au/climate/mjo/graphics/rmm.74toRealtime.txt) M. C. Wheeler and H. H. Hendon https://doi.org/10.1175/1520-0493(2004)132<1917:AARMMI>2.0.CO;2

Short summary

A revisited space and time spectral decomposition allows us to determine which harmonics dominate the upper-tropospheric flow evolution over a given time period as well as their propagation. This approach is used to identify Rossby wave patterns with a circumglobal extent, affecting weather evolution over different Northern Hemisphere regions. The results cast light on the processes originating and supporting these wave patterns, advocating at the same time for the usefulness of the technique.