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2022-09-27

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cc by (c) Mezzina, Bianca, 2022
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/192697

Tropospheric pathways of the late-winter ENSO teleconnection to Europe

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Recurs relacionat

https://doi.org/10.1007/s00382-022-06508-6

Resum

The late-winter signal associated with the El Niño-Southern Oscillation (ENSO) over the European continent is unsettled. Two main anomalous patterns of sea-level pressure (SLP) can be identified: a "wave-like" pattern with two opposite-signed anomalies over Europe, and a pattern showing a single anomaly ("semi-isolated"). In this work, potential paths of the tropospheric ENSO teleconnection to Europe and their role in favoring a more wave-like or semi-isolated pattern are explored. Outputs from historical runs of two versions of the MPI-ESM coupled model, which simulate these two types of patterns, are examined. A novel ray-tracing approach that accounts for zonal asymmetries in the background flow is used to test potential propagation paths in these simulations and in observations; three source regions are considered: the tropical Pacific, the North America/North Atlantic, and the tropical Atlantic. The semi-isolated pattern is suggested to be related to the well-known Rossby wave train emanating from the tropical Pacific, either via a split over northern North America or via reflection due to inhomogeneities in the background flow. The wave-like pattern, in turn, appears to be related to a secondary wave train emerging from the tropical Atlantic. The competition between these two pathways contributes to determining the actual surface response.

Matèries

Corrent del Niño, Climatologia, Canvi climàtic

Matèries (anglès)

El Niño Current, Climatology, Climatic change

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Articles publicats en revistes (Física Aplicada)

Citació

MEZZINA, Bianca, et al. Tropospheric pathways of the late-winter ENSO teleconnection to Europe. Climate Dynamics. 2022. ISSN 0930-7575. [consulted: 28 of August of 2026]. Available at: https://hdl.handle.net/2445/192697

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