EFFECT OF THE NORTH ATLANTIC OSCILLATION ON EXTREME AIR TEMPERATURES AT THE POLISH BALTIC COAST * * * *

Czesław Koźmiński, Boŝena Michalska
2010 Acta Agrophysica   unpublished
Data collected during the period of 1956-2005 at 8 meteorological stations of the Institute of Meteorology and Water Management (IMWM) situated along the Polish Baltic coast were used to provide a quantitative assessment of the North Atlantic Oscillation (NAO) effects on variability of the maximum and minimum air temperatures at the coast. The data were coupled with the NAO (Jones) index values reflecting the difference between normalized atmospheric pressure in Gibraltar (the Azores High) and
more » ... n Reykjavik (the Icelandic Low). In December-March, NAO effects explain 53-68% of the variability of the maximum air temperature along the coast, the variability of the minimum temperature being accounted for in 43-63%. As a rule, the positive NAO phase (index values > 2.0) brings about an increase in the extreme daily temperature, the negative phase (<-2.0) resulting in a significant reduction of the temperature. A unit increase in the NAO index results in the highest increase of the minimum temperature, by 1.4-2.
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