Über die statistische Sicherung der jüngsten Schwankungen des Klimas in Österreich

Cehak, Konrad

doi:10.1007/bf02243053

Cited by 7 publications

(5 citation statements)

References 2 publications

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“…Despite the increase of temperature during winter over the last century, which appears real according to Fliri, he does not find a significant linear secular trend for the snow cover duration in Tyrolia. On the other hand, Cehak (1977) and Mohnl (1994) report for most stations in Austria, a decrease in snow cover days; e.g. Mohnl finds a reduction of the snow cover duration by 10-30% over the last 100 years.…”

Section: Discussionmentioning

confidence: 99%

Climate sensitivity of snow cover duration in Austria

2000

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The number of days with snow cover at Austrian climate stations, normalized by the maximum possible snow days within a season, is denoted n. This seasonal relative snow cover duration is considered a function of station height H and of the seasonal mean temperature T over Europe. When T increases, n decreases and vice versa. The function becomes saturated both for high stations at low European temperature (‘always snow’, n=1) and for low stations at high temperature (‘never snow’, n=0). In the saturated regions, the sensitivity s≡∂n(H, T)/∂T is practically zero, while in the transition region, s is extreme. The observed interannual fluctuations of T are considered here as simulation of a possible climate shift. s is determined for the climate stations of Austria from its snow cover record [1961–1990, 84 stations between 153 and 3105 m above sea level (a.s.1.)] by fitting the data of n for each individual station (local mode) as well as for all Austrian stations (global mode) with a hyperbolic tangent function. In the global mode, s reaches an extreme value of −0.34±0.04 K−1 in winter and −0.46±0.13 K−1 in spring. The implications of these results are discussed. Included in this discussion is the fact that a rise in the European temperature by 1 K may reduce the length of the snow cover period in the Austrian Alps by about 4 weeks in winter and 6 weeks in spring. However, these extreme values apply only to the height of maximum sensitivity (575 m in winter, 1373 m in spring); the actual sensitivity of individual stations located at higher or lower levels is less. Copyright © 2000 Royal Meteorological Society

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Section: Discussionmentioning

confidence: 99%

Climate sensitivity of snow cover duration in Austria

2000

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“…Hungary). In Austria, too, (Cehak, 1977) the annual precipitation sums in the period 1931-1975 were dropping prevailingly.…”

Section: Variation Of Annual Precipitation Sums In Central Europementioning

confidence: 98%

Variation of spatial annual precipitation sums in central europe in the period 1881‐1980

Brázdil¹,

Šamaj²,

Valoviĉ³

1985

J. Climatol.

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The analysis of atmospheric precipitation variation in Central Europe in the period 1881-1980 is based on the series of the so-called spatial annual precipitation sums for the F.R.G., the G.D.R., Poland, Bohemia, Moravia, Slovakia and Hungary and for the Baur series. The annual precipitation variation in the above period is studied by means of series of 5-year and ll-year gliding means. Methods of autocorrelation analysis, spectral analysis (partly according to Blackman and Tukey, partly maximum entropy spectral analysis), coherency analysis and numerical bandpass filtering were used for analysing precipitation periodicities and cycles.In the period studied, the western part of Central Europe (the Baur series, F.R.G., also G.D.R.) shows a generally increasing precipitation trend at below-mean sums approximately up to 1920, whereas a more or less decreasing tendency is typical of the remaining series. Periods with analogous lengths appear in precipitation series in the whole of Central Europe and at the same time the lengths of significant periods are shortened from 4.4 and 50a (a = year) in the western part to 3.3 and 3-6a in the eastern part. At the same time, significant coherence among the studied series most frequently appears for periods of 2.5 and 13.3a. Periods with lengths of 2-3 years take a more conspicuous part in the total variance of the corresponding series (about 30 per cent), except in the cases of Slovakia and Hungary, where the maximum share is shifted to oscillations with periods of 3-4 years and for the F.R.G. and the Baur series to the interval of 4-6 years. The course of the filtered series refers to the length and phase instability of the periodicities found, which complicates the use of the knowledge obtained for long-term precipitation forecasting.

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“…In spite of these limitations, some important decreasing precipitation trends have been observed at different stations in central and south Europe and in Cyprus since about the first quarter of this century (Cehak, 1977; 0899-841 8/93/0201 91 ~ 1 1$10.50 83 1993 by the Royal Meteorological Society BraLdil et al, 1985;Colacino and Purini, 1986;Repapis et a)., 1989), in the western USA and in Japan since about 1955 (Diaz and Quayle, 1980;Takahasi, 1989) and in India since the beginning of this century (Soman et ul., 1988). An extensive study of precipitation changes since the mid-nineteenth century using a large number of stations in thc Northern Hemisphere restricted these decreasing trends to low-latitudes (5 -35 N) during the last 40 years (Bradley et al, 1987).…”

Section: Introductionmentioning

confidence: 99%

Decreasing precipitation trend in the Marathon area, Greece

Amanatidis

Παλιατσός

Repapis

et al. 1993

Intl Journal of Climatology

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The long-term precipitation series ) from a 10 rain gauge station network in the Marathon area, Greece, have been statistically examined for trends. Application of the Mann-Kendall rank statistic test to the annual time series revealed a significant decreasing trend in the precipitation over the area. Similar decreasing trends are observed in neighbouring regions to the Marathon area (Athens basin and Beotia). The differences in precipitation trends during the transitional seasons among the three areas seem to be caused by the urbanization process. The seasonal variations and the periodicities of precipitation in the study areas also are examined. Finally, the spatial distribution of precipitation and the relation of precipitation amounts to the station height in the Marathon area are discussed.

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Über die statistische Sicherung der jüngsten Schwankungen des Klimas in Österreich

Cited by 7 publications

References 2 publications

Climate sensitivity of snow cover duration in Austria

Climate sensitivity of snow cover duration in Austria

Variation of spatial annual precipitation sums in central europe in the period 1881‐1980

Decreasing precipitation trend in the Marathon area, Greece

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