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Warunki meteorologiczne na Równinie Kaffiöyra (NW Spitsbergen) w okresie od 13 lipca do 9 września 1999 roku

Araźny A.

Problemy Klimatologii Polarnej

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2000

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nr 10

73—92

EN

The article presents results of meteorological observations carried out in the summer of 1997 on the Kaffiöyra Plain during 13rd Toruń Polar Expedition. The measurements were carried out four climatological time a day (01, 07, 13 and 19 LMT) from 21st July to 1st September 1997 i.e. 43 days. The values of meteorological elements are presented in tab. 2 and fig. 2. Apart from the 1997 summer data, there have also been presented for comparison mean values of basic meteorological elements from comparable period s (July 21 - August 31 ) of all the summer seasons when the Toruń Polar Expeditions operated on Spitsbergen (tab. 4). The summer season in 1997 was very wet, with domination of strong winds and average sunshine, thermic and humidity conditions. During the research period cyclonic situations dominated (52.4%), on 47.6%, of the days the weather conditions were formed by anticyclones.

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Warunki meteorologiczne na równinie Kaffiöyra (NW Spitsbergen) w okresie od 3 VII do 31 VIII 2000 roku

Przybylak R., Szczeblewska E.

Problemy Klimatologii Polarnej

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2000

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nr 10

111--137

EN

The paper presents the results of meteorological measurements carried out in the Kaffiöyra Plain in the summer season of 2000 during the 19th Toruń Polar Expedition. Area, range and methodology of measurements were analogical as in the previous expeditions. The bulk of meteorological observations has been done near the Polar Station of N. Copernicus University (φ = 78°41 'N, λ = 11°51'E, h = 11.5 m a.s.1.) located in the northern part of Kaffiöyra (NW Spitsbergen), The standard measurements of all main meteorological elements were carried out four times a day (at 00, 06, 12 and 18 GMT). The best summary of obtained results present tab. 2 and fig. 1. It can be seen from them that generally air temperature oscillated between 2 and 8°C. Minimum temperature in two periods dropped below O°C, while maximum temperature did not exceed 10°C. Precipitation (including trace precipitation) were observed with frequency slightly higher than 50% of days. Most of daily precipitation sums did not exceed 4 mm. Majority of the analysed elements (wind velocity, cloudiness, air temperature, water vapour pressure and precipitation) had higher values in July than in August. In comparison with previous 11 summer seasons, when meteorological measurements were done in Kaffiöyra, summer in 2000 was characterized by: l) the highest frequency of cyclones, 2) the highest/lowest frequency of winds from the northern (NW, NNW and N) and southern (SE, SSE and S) sectors, respectively, 3) below/above normal cloudiness and sunshine duration, respectively, and 4) significantly below long-term mean air temperature and atmospheric precipitation.

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Warunki meteorologiczne na Kaffiöyrze (NW Spitsbergen) w okresie od 13 lipca do 9 września 1999 roku

Kejna M.

Problemy Klimatologii Polarnej

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2000

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nr 10

93--110

EN

The meteorological investigations were carried out in the summer season of 1999 (from July 13 to September 9) during XVIIth, Polar Expeditions of Nicholas Copernicus University. Area, range and methodology of measurement were continuations of investigations made during the previous expeditions. The main meteorological observations were conducted in Polar Station of N. Copernicus University (φ = 78°41 'N, λ=1l°51 'E, h = 11.5 m a.s.l.), situated in northern part of the Kaffiöyra (NW Spitsbergen). Moreover on Waldemar Glacier were carried out registration of air temperature. air humidity and precipitations (3 stands). In the paper are presented the results of the base station. In summer 1999 the weather on Spitsbergen was governed by cyclones (52%) moved on the east from Iceland depression and anticyclone situated on Barents Sea (45%). Frequency of air masses advection from east and north was greater than during previous expeditions. At the second decade of July weather was very warm (maximum of air temperature 18.1 °C) and sunny (82.7 hours). The high temperatures occurred during foehn phenomena. The comparison between summer season 1999 and mean values from the years 1975-1999 in the common period (21.07-31.08) shows that this season was characterised by cloudiness (8.9) greater than mean many years' values, sunshine duration (150.1 hours), air humidity (85%) and wind velocity (3.8 m/s) below norm and air temperature (4.9°C) near mean many years’ values. In summer 1999 there weren 't frosty days and snow cover.