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Variability of atmospheric circulation in Central Europe in the summer season 1881–1998 (on the basis of the Hess-Brezowski classification)

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This paper analyses the trends and fluctuations of three different indices of circulation above Central Europe in the summer seasons of the period 1881-1998. The daily atmospheric circulation subtypes according to the Hess-Brezowski classification were used as research material. The method applied in the process was prepared by MURRAY and LEWIS (1966) and modified by NIEDZWIEDZ (2000). Appropriate values of the westerly zonal circulation index (W index), the southerly meridional circulation index (S index) and the cyclonicity index (C index) were assigned to each circulation subtype. It was found that in the summer seasons of 1881-1998 the westerly zonal circulation index underwent a reduction while the southerly meridional circulation index was augmented. The observed reduction of the westerly zonal circulation index is mainly the result of a decrease in the number of days characterised by a circulation with a westerly component NW and an increase in the number of days with a circulation containing an easterly component E. At the same time, there was a clear rise of the SW circulation within the westerly zonal circulation

In diesem Artikel werden die Trends und Schwankungen von drei verschiedenen Zirkulationsindizes über Mitteleuropa in den Sommermonaten 1881-1998 analysiert. Als Untersuchungsgrundlage wurden die täglichen atmosphärischen Zirkulations-Subtypen entsprechend der Hess-Brezowski Klassifikation verwendet. Die hierbei angewandte Methode wurde von MURRAY und LEWIS (1966) entwickelt und von NIEDZWIEDZ (2000) modifiziert. Zur Indexierung der Zirkulations-Subtypen wurden jeweils passende Werte des westlichen zonalen Zirkulationsindexes (W Index), des südlichen meridionalen Zirkulationsindexes (S Index) und des Zyklonizitäts-Index (C Index) den Zirkulations-Subtypen zugeordnet. Dabei stellte sich heraus, dass sich in den Sommermonaten von 1881-1998 die Werte des westlichen zonalen Zirkulationsindexes verringerten, während der südliche meridionale Zirkulationsindex zunahm. Die festgestellte Verringerung des westlichen zonalen Zirkulationsindexes resultiert hauptsächlich aus einer Abnahme der Tage, welche von einer Zirkulation mit einer westlichen Komponente NW geprägt sind, bei einer entsprechenden Zunahme der Tage mit einer östlichen Komponente E. Gleichzeitig ließ sich ein klarer Anstieg der SW Zirkulation innerhalb der westlichen Zirkulationszone feststellen.
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Document Type: Research Article

Publication date: 2003-06-01

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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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