Northern hemisphere circulation regimes during the extremes of the EI Nino/Southern Oscillation

Klaus Fraedrich; Klaus Müller; Rainer Kuglin

doi:10.3402/tellusa.v44i1.14941

Northern hemisphere circulation regimes during the extremes of the EI Nino/Southern Oscillation

Tellus

Volume 44 (1992): Issue 1

By: Klaus Fraedrich, Klaus Müller and Rainer Kuglin

Open Access

|Jan 1992

Abstract

Mid-latitude circulation regimes affected by the El Ni±o/Southern Oscillation (ENSO) warm and cold extremes are analysed using a daily data catalogue (after Dzerdzeevskii) of 36 different hemispheric circulation patterns per season. These patterns are combined to form a bimodal structure of predominantly zonal and meridional steering of the cyclones and anticyclones. The largest ENSO response of these modes is observed in winter seasons at the end of the year of the event with enhanced zonality (meridionality) responding to warm (cold) episodes. Individual circulation patterns show that a warm event forces the storm track across the North Pacific into a more zonal direction, in particular its more sensitive tail in the eastern region. Furthermore, the distribution of residence times of the circulation regimes reveals an enhanced warm event response of short period (4–8 days) disturbances associated with a larger zonal wavenumber.

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Articles in this issue

DOI: https://doi.org/10.3402/tellusa.v44i1.14941 | Journal eISSN: 3035-9554

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Language: English

Page range: 33 - 40

Submitted on: Nov 13, 1990

Accepted on: Mar 7, 1991

Published on: Jan 1, 1992

Published by: Stockholm University Press

In partnership with: Paradigm Publishing Services

© 1992 Klaus Fraedrich, Klaus Müller, Rainer Kuglin, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 44 (1992): Issue 1