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vol. 10, nr. 3 (2007)
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Reaction of atmospheric precipitation water over Olsztyn area
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Zbigniew Szwejkowski, Stanisław Suchecki, Ewa Dragańska
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Department of Meteorology and Climatology, Warmia and Mazury University, pl Łódzki 1, 10-720 Olsztyn |
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vol. 10 (2007), nr. 3,
pp. 715-725
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abstract:
The study presents an analysis of the acidity of rainfalls as measured by the Hydro-Meteo Regional Station in Olsztyn in the period between 2002 and 2006. The variance of annual and monthly rainfall totals during this period ranged between 491.7 and 715.3 mm. The mean annual pH values of rainfalls over Olsztyn increased year to year from 4.47 in 2002 to 4.87 in 2006. The lowest pH was measured in February and especially in March, with the remainder of the year at a stable level from April to December. No clear difference was observed between the pH of rain- and snowfall, however, we found that the pH values were higher during warmer periods of the year. Olsztyn experienced base (pH 4.6-5.0) rainfall in 28.4% of cases as opposed to slightly-to-very acidic character in only 17.1% of the time. The longer the time window (up to 4 days) between successive rainfalls the lower was the pH, however once the window exceeded 4 days the pH values started to increase. The acidity of rainfall was also influenced by wind direction, with winds from south and southwest linked to higher acidity of rainfall. The regression analysis found significant relationship between the pH values of rainfall over Olsztyn and air temperature, daily rainfall total and wind velocity.
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keywords:
atmospheric precipitation, reaction, Olsztyn
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original in:
Polish
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