Zbigniew Ustrnul

Research notes

Synoptic - climatic structure of the extreme air thermal phenomena in Poland

Zbigniew Ustrnul

Geographia Polonica (2000) vol. 73, iss. 2, pp. 99-110 | Full text

Further information

Abstract:

The influence of atmospheric circulation upon extreme temperatures in Poland is being analysed. Maximum and minimum temperature values have been collected from 19 meteorological (synoptic) stations for the period 1951-1999. Simultaneously, a catalogue of circulation types after Osuchowska-Klein has also been used. An analysis of mean monthly and seasonal values is provided, as well as the conditional probability of selected temperature thresholds during the occurrence of particular types. Days with maximum temperatures over 25°C, minimum temperatures below -15°C and the absolute extremes for the selected stations have been investigated in detail. This confirmed a significant influence of atmospheric circu-lation upon the occurrence of extreme temperatures much larger than other local factors. The last part contains an analysis of the number of days with given thermal characteristics with respect to circulation indices.

Keywords: maximum and minimum temperature, extreme temperature values, atmos-pheric circulation, synoptic climatology

Zbigniew Ustrnul, Institute of Meteorology and Water Management P. Borowego 14, 30-215 Kraków, Poland

Articles

Variability of the Air Temperature in Central Europe in the Years 1792-1995

Janina Trepińska, Zbigniew Ustrnul, Leszek Kowanetz

Geographia Polonica (1997) vol. 70, pp. 43-52 | Full text

Further information

Abstract:

Use was made of the longest-existing series of air temperature observations from Central Europe, specifically those for Warsaw, Kraków, Prague and Vienna. It was, above all, the course of mean annual values for air temperature that was analyzed, thus allowing this study to serve also as a basis for further, more precise studies including the variability and cyclicity of air temperature values in particular months. The application and attempted interpretation of periodograms drawn up on the basis of data for January, April, July and October has confirmed the above opinion. In general, considerable concurrence in the courses of mean air temperature values at the selected stations may be noted, and hence the influence of the same circulation mechanisms shaping air temperature over a large area during the two centuries.

Keywords: long air temperature series, mean annual air temperature, variability, periodicity

Janina Trepińska, Institute of Geography, Jagellonian University ul. Grodzka 64, 31-044 Kraków, Poland
Zbigniew Ustrnul, Institute of Meteorology and Water Management P. Borowego 14, 30-215 Kraków, Poland
Leszek Kowanetz, Institute of Geography, Jagellonian University ul. Grodzka 64, 31-044 Kraków, Poland