Decadal cyclone variability in the North Atlantic

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Abstract:

The unstable midlatitude ocean-atmosphere coupling motivates the definition of two decadal regimes with distinct implications for the North Atlantic cyclone variability. Phases with low (high) decadal variability of the North Atlantic Oscillation, which are connected with an annular (sectoral) spatial scale of the geopotential height teleconnection pattern, are identified as a hemispheric (regional) regime. In the hemispheric regime during a positive El Niño/Southern Oscillation (ENSO) index (warm event), the North Atlantic cyclones and the regions of enhanced precipitation shift southward while over northern Europe the cyclone activity and the rainfall are reduced. During the regional regime this impact of ENSO on the Atlantic storm track is extremely small and a clear interpretation over Europe is inhibited.

German
Die instabile Atmosphäre-Ozean-Wechselwirkung in den mittleren Breiten begründet die De finition zweier dekadischer Regime mit charakteristischen Auswirkungen auf die Variabilität der nordatlantischen zyklonalen Aktivität. Phasen mit niedriger (hoher) dekadischer Variabilität der Nordatlantischen Oszillation, die mit annularen (sektoralen) räumlichen Skalen der Geopotential-Telekonnektionsmuster zusammenhängen, werden als hemisphärische (regionale) Regime identi fiziert. Im hemisphärischen Regime bei einem positiven El Niño/Southern Oscillation (ENSO) Index (Warmereignis) verschieben sich die nordatlantischen Zyklonen und die Regionen erhöhten Niederschlags südwärts, während die zyklonale Aktivität und der Niederschlag über Nordeuropa reduziert sind. Im regionalen Regime ist der ENSO-Ein fluss auf den nordatlantischen Stormtrack sehr schwach und eine eindeutige Interpretation über Europa nicht möglich.

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2005/0075

Publication date: December 1, 2005

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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