Analysis of the monthly zonal index valu
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T. J. Makrogiannis; H. S. Sahsamanoglou; A. A. Flocas; A. A. Bloutsos
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Article
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2007
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John Wiley and Sons
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English
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## Abstract Mean monthly zonal index (__ZI__~m~) values over the North Atlantic and Europe, during the period 1873โ1988, are studied. The frequency distribution of the percentage occurrence of the mean monthly __ZI__~m~ values and the length of the spells of low and high __ZI__~m~ values show that