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Anomalnie wysokie miesięczne opady atmosferyczne w Polskich Karpatach i na ich przedpolu (1881–2010)

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Twardosz R., Cebulska M.

Prace Geograficzne

2014

issue 138

Anomalously high monthly precipitation totals in the Polish Carpathian Mountains and their foreland (1881–2010)The study addresses the problem of river flooding and other dangerous natural processes as well as phenomena resulting from persistent heavy rainfall. Annual and multi-annual records of anomalously heavy precipitation were investigated using data from 16 weather stations in the Polish Carpathian Mountains and their foreland from the period 1881–2010. The anomalously high precipitation was studied in terms of its annual and multi-annual pattern, time of occurrence, spatial extent and the coinciding atmospheric circulation. The anomalously high monthly totals were defined as those, which exceeded the upper quartile plus 1.5x the interquartile range. It was found that during the 130 years of the study period, there were 200 anomalously heavy precipitation months (AHMs), which occurred in 106 years. Most of them were only recorded at either a single station or at two neighbouring stations, which would suggest that precipitation of this magnitude depends not just on circulation circumstances, but also on local factors. No statistical change was found in the long-term A H M occurrence pattern. There were two instances, where an A H M was recorded simultaneously at all 16 stations, in May 1940 and 2010, and they both contributed to catastrophic floods. The latter of the events involved both the highest absolute totals (exceeding 500 mm) and the highest relative totals (i.e. the percentage of the long-term average close to 500%). The A H Ms tended to coincide with cyclonic circulation. Between October and March, this was the western cyclonic circulation ( Wc ), while for the remaining part of the year it was cyclonic trough (Bc).

Zmienność czasowa najwyższych miesięcznych sum opadów atmosferycznych w Polskich Karpatach Zachodnich (1951-2005)

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Cebulska M., Twardosz R.

Prace Geograficzne

2012

issue 128

127-138

W artykule zbadano wieloletni i roczny przebieg najwyższych miesięcznych sum opadów atmosferycznych w Polskich Karpatach Zachodnich na podstawie danych z 6 stacji: Nowy Sącz, Sanok, Bielsko-Biała, Maków Podhalański, Krynica i Zakopane z okresu 1951–2005 oraz wyznaczono ich wartości prawdopodobne. Wykazano, że najwyższe miesięczne sumy opadów mogą występować w ciągu całego roku, z największą częstością w miesiącach letnich. Nie stwierdzono istotnych statystycznie trendów zmian wieloletnich, a jedynie krótkookresowe fluktuacje.

The authors have investigated long-term and annual patterns in maximum monthly precipitation totals in the Western Carpathian Mts. in Poland. Data from six stations (Nowy Sącz, Sanok, Bielsko-Biała, Maków Podhalański, Krynica and Zakopane) spanning the period 1951–2005 were used both in their raw form and as derived probabilities. The study showed that the highest monthly precipitation totals were likely to occur throughout the year, but most frequent were in the summer months. No long-term statistically significant trends were identified, just shorter-term fluctuations. All of the stations recorded high precipitation totals in last years of the 20th c. and in 2001 too, while lower totals were recorded in the mid-1990s. During the first five years of the 21st c., the trend to a decrease was found at most of the stations. At some of them peak monthly totals exceeded the monthly average figures by more than 350%. For precipitation totals with a 1% probability of exceedance, the highest totals were obtained from Gumbel distribution and the lowest from the normal distribution at all of the stations. In high probability ranges (e.g. p = 20%) the highest precipitation was derived from Weibull distribution. The highest maximum monthly totals recorded during the period 1995–2005 corresponded approximately to a 1% probability of exceedance. The only exception was the station at Maków Podhalański, where the highest monthly precipitation of 521.1 mm was at 88.1 mm higher than the figure derived from the theoretical distribution with p = 1%.

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2 Prace Geograficzne

2 Cebulska M.

2 Twardosz R.

1 2014

1 2012

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Anomalnie wysokie miesięczne opady atmosferyczne w Polskich Karpatach i na ich przedpolu (1881–2010)

Zmienność czasowa najwyższych miesięcznych sum opadów atmosferycznych w Polskich Karpatach Zachodnich (1951-2005)