Ekstremalne osobliwości w rocznym przebiegu temperatury powietrza w Krakowie w latach 1826-2010

Abstract

Extreme cases of singularities in the annual course of air temperature in Krakow in the period 1826–2010 The aim of this study is to identify extreme cases of the appearance of singularities in the annual air temperature course in the period 1826–2010 in Krakow. In climatological literature the term “singularities” denotes characteristic fluctuations in the annual course of temperature, occurring periodically every year. In this paper a special attention was paid to the duration and long-term variability of distinguished singularities. A 5-degree polynomial was used to smooth out the annual course of temperature. A model of temperature variation was calculated on this basis. Differences between the mean daily temperature values and those calculated from the model was taken into account to distinguish these singularities. It was found that in the period 1826–2010 in Krakow, warm anomalies slightly prevailed over cold anomalies. In the annual course, singularities occurred most frequently in spring, but the greatest differences between the daily mean air temperature and that calculated from the model appeared in winter. However, there was no clear recurrence of the analyzed events (singularities) in the multi-year period.