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vol. 16, nr. 1 (2010)

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Oddziaływanie oscylacji północnoatlantyckiej na ekstremalne temperatury powietrza w strefie polskiego wybrzeża Bałtyku
Czesław KoĽmiński1, Bożena Michalska2
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1 Department of Marine Climatology and Meteorology, Szczecin University ul. W±ska 13, 71-415 Szczecin
2 Department of Meteorology and Climatology, West Pomeranian University of Technology ul. Papieża Pawła VI, 3, 71-434 Szczecin

vol. 16 (2010), nr. 1, pp. 79-91
abstract: Data collected during the period of 1956-2005 at 8 meteorological stations of the Institute of Me-teorology 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 in 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 1.4-2.1oC, in February and January, and in the increase of the maximum temperature by 0.9-1.5oC in those months.
keywords: extreme air temperature; NAO index; Polish Baltic coast
original in: English