Zmienność warunków meteorologicznych w Hornsundzie (SW Spitsbergen) w okresie 1 VII 1999 - 30 VI 2000 roku

Measurements and meteorological observations at Hornsund were carried out in the frame of the 22nd Polish Polar Expedition "Spitsbergen 1999/2000" research work. This was the consecutive year-long expedition organized by the Geophysical Institute of the Polish Academy of Sciences. Circulation factors have a great influence on the meteorological conditions at Hornsund. The mean annual atmospheric pressure at the sea level (1005.0 hPa) was lower than its long-term average. The mean wind velocity was 5.8 m/s. There were 971.9 hours with sunshine. The analysed year was characterised by high air temperature as for the Arctic conditions. The mean annual air temperature was -3.7°C, and was 1.1OChigher then its long-term average. The analysis of the air temperature trend in the period 1978-2000 shows a systematic warming about 0.07°C/year on the southern Spitsbergen. The annual sum of precipitation was 500.9 mm, i.e. about 77 mm higher then the long-term average. In September the highest monthly precipitation sum (230.0 mm) was measured till now.