Regional differences in the influence of the North Atlantic Oscillation on seasonal river runoff in Poland
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Date
2011
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Wydział Nauk Geograficznych i Geologicznych Uniwersytetu im. Adama Mickiewicza
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Abstract
In this paper, an analysis of monthly and seasonal runoff volumes in two stages of the North Atlantic
Oscillation are presented. The analysis embraced runoff at 146 profiles located on 96 Polish rivers during the
years 1951–2000. The changes in the runoff conditions of Polish rivers in the two NAO stages and their spatial
diversity were determined based on the differences between runoff observed in the years of exceptionally high
(NAODJFM > 2,0) and low (NAODJFM < –2,0) values of the winter NAO index. The results of the research indicate
that the influence of the North Atlantic Oscillation on the runoff of Polish rivers is diverse in terms of time and
space. A classification of rivers was made in terms of the similarity of deviations of their seasonal runoff between
the different NAODJFM stages. In the classification procedure use was made of Ward’s method of hierarchical
grouping. In this way, five classes of the river profiles under analysis were obtained. Environmental conditions
in the catchments and hydrological regime features clearly influence the regional differences in the impact of the
North Atlantic Oscillation on the flow of rivers.
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Keywords
North Atlantic Oscillation, river runoff, river typology, Poland
Citation
Quaestiones Geographicae vol. 30 (3), 2011, pp. 127-136
ISBN
978-83-62662-62-3