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Przebieg roczny wilgotności względnej w Arktyce Norweskiej w okresie 1971-2000

100%

Araźny A.

tom nr 13

107-115

The paper presents the analysis of the spatial variability of relative humidity in the Norwegian Arctic during the year (Fig.1, Table 2) for 6 meteorological stations (Table 1). We determined the frequency of relative humidity according intervals (Fig. 2) and examined its connection with atmospheric circulation indices (Table 3, Fig. 3). In the Norwegian Arctic 3 types of courses of the relative humidity have been distinguished on the basis of mean monthly values, amplitudes and occurrence frequency in distinguished intervals: 1) very wet - characterised by monthly and annual mean values of the relative humidity higher than 80%, small annual amplitudes up to 10%. This type includes the stations Bjornoya, Hopen i Jan Mayen. During the year at these stations very wet air dominates (236, 218 and 175 days, respectively). 2) wet - characterised by large annual amplitudes over 10%. Mean monthly values exceeding 80% occur only in summer and early autumn. This type occurs at the stations Hornsund and Ny-Alesund. At these stations wet air is the most frequent: 181 and 141 days during the year, respectively. 3) moderately wet - characterised by even level in every month below 80%, very small annual amplitude up to 5%. This type occurs at Svalbard Lufthavn where wet (171 days) and moderately dry (135 days) air is the most frequent.

Variability of the predicted insulation index of clothing in the Norwegian Arctic for the period 1971-2000

88%

Araźny A. , Araźny A.

Zmienność parametrów termicznych w Arktyce Norweskiej w okresie 1951-1990

75%

Przybylak R.

tom nr 9

23--36

In the paper, changes in mea n annual intraseasonal (within season) and interannual (between years) temperature variability have been analysed over the Norwegian Arctic for the period 1951 to 1990. The daily maximum (TMAX) r mean (TSR), minimum (TMIN) temperatures and the diurnal temperature range (AMP) for the Jan Mayen and Hopen stations were examined. The temperature variability parameters and the method of computations was the same as in Plummer (1996), except the computation method of the long-term daily mean values, which here were obtained by averaging daily data from the period 1951-1990. Plummer have received these series by performing a Fourier analysis of their monthly mea n and interpolating from their respective average annual cycles. In the Norwegian Arctic, similarly as for Australia (Plummer 1996), trends in intraseasonal temperature variability were mixed and in all cases not statistically significant (Figs 1-8). These results are in good agreement with the observed lack of warming in the studied area over the period 1951-1990 (Przybylak 1996, 1997). Most sensitive to high-frequency temperature variability, of the four thermic parameters, is TMAX. Plummer (1996) also found similar results for Australia. The range of changes in intraseasonal variability and their values decreases when the time-scale of averaging intervals increases. Small, not statistically significant, increases in interannual variability for all thermic parameters were observed in the studied area (Fig. g). The greatest interannual variability in both analysed stations shows TMIN and the lowest AMP. In Australia Plummer found TMAX as the most sensitive to this kind of variability.

Variability of the predicted insulation index of clothing in the Norwegian Arctic for the period 1971-2000

75%

Arazny A.

Polish Polar Research

2006

tom 27

nr 4

341-357

This paper presents the spatial distribution of changes in the value of the predicted insulation index of clothing (Iclp) in the Norwegian Arctic for the period 1971-2000. For this study, data from six meteorological stations were used: Ny-Ålesund, Svalbard Airport, Hornsund, Hopen, Bjørnøya and Jan Mayen. The impact on the atmospheric circulation to the course of the Iclp index was analyzed using the catalogue of circulation types by Niedźwiedź (1993, 2002), the circulation index according to Murray and Lewis (1966) modified by Niedźwiedź (2001), the North Atlantic Oscillation Index according to Luter- bacher et al. (1999,2002), and the Arctic Oscillation Index (Thompson and Wallace 1998).