Fale termiczne nad Polską w zimie w zależności od pola wiatru w Europie

• Autorzy: Degirmendzić J.

Warianty tytułu

EN

Thermal waves in Poland during winter in relation to the wind field in Europe

• Języki publikacji: PL

Abstrakty

EN

The main goal of this paper is to analyze transformation of wind field over Europe associated with change of intensity of thermal wave in Poland during winter. Thermally anomalous periods were distinguished on the basis of daily mean temperature record at 52.5°N, 20°E grid point. Wind field was defined by meridional and zonal wind components. Both, temperature and wind data were retrieved from NCEP/NCAR Reanalysis. The analysis was performed for the period of 1950-2001 and 850 hPa isobaric level. Cold/heat waves were categorized into three thermal classes - extreme, moderate and weak. In order to analyze wind field the following parameters were employed: relative vorticity, wind speed and directional steadiness of wind vector. Additionally, the structure of streamlines was analyzed. Temperature rise in Poland is forced by the development of dipole-like structure, clearly seen on the map of anomalies of relative vorticity. Positive anomalies are situated over Norwegian See, eastern Atlantic and Scandinavia, while negative vorticity advection is observed in southern Europe. Simultaneously with dipole development the increase of wind speed in middle Europe is also noted - supposedly it constitutes significant feature of wind field responsible for temperature increase in Poland in winter. In case of extreme heat waves the source region of warm advection is shifted southwards. Streamline pattern indicates more parallel flow over the Atlantic to the Iberian Peninsula and change of wind direction over Poland, from westerly to south-westerly. Intensive transport of heat over the northern Europe reduces temperature contrast at the Mediterranean front, which consequently decelerates western flow and lowers directional steadiness of wind vector down to 50% over the southern part of continent. Field of vorticity anomalies corresponding to the cold waves occurrence over Poland posseses dipole-like structure, however its polarization is reversed. Anticyclonic vorticity advection occurs in northern Europe and northern Atlantic while southern Europe experiences increase of cyclonic vorticity. Cooling in central Europe is associated with transformation of circulation field into blocking type - simultaneously the source region of cold advection shifts northwards over the Scandinavia (around 70°N). Enhanced thermal contrasts over southern Europe together with air masses inflow from the north, i.e. possessing surplus of cyclonic vorticity, strengthen the Mediterranean front.

Słowa kluczowe

PL

pole wiatru; fala termiczna; fala ciepła; fala chłodu; Polska; Europa

EN

wind field; thermal wave; Poland

• Wydawca: Polskie Towarzystwa Geofizyczne ; Komitet Geofizyki PAN
• Czasopismo: Przegląd Geofizyczny
• Rocznik: 2004
• Tom: Z. 1-2
• Strony: 11--23
• Opis fizyczny: Bibliogr. 22 poz., tab., wykr.

Twórcy

autor

Degirmendzić J.

• Zakład Dynamiki Środowiska i Bioklimatologii UŁ

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