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vol. 10, nr. 1 (2007)
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Evaluation of drought intensity in the Szczecin Lowlands in 2006 in comparison to a multi-year period
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Bożena Michalska, Eliza Kalbarczyk
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Department of Meteorology and Climatology, Agricultural University, ul. Papieża Pawła VI nr 3, 71-769 Szczecin |
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vol. 10 (2007), nr. 1,
pp. 159-173
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abstract:
In the present study, diurnal (24 hr) meteorological data (air temperature and precipitation) from 1st April to 30th September, 2006, and decade data from the years 1957-2006 gathered at the meteorological station in Lipnik near Stargard Szczeciński were used. The thermal classification of the months from April to September, 2006, was carried out on the basis of the value of the standard temperature deviation () from the norm, i.e. from the average air temperature of the multi-year period of 1957-2006 as it was assumed in the study. The precipitation was classified according to Kaczorowska's criterion and the standardized precipitation index SPI. On the basis of the criteria used in the study, June 2006 was regarded as a very warm and dry month, and July as extremely warm, the warmest in the Szczecin Lowlands for 50 years. The value of the SPI was -1.74. More intensive droughts occurred in July 1969 and in September 1959, 1969, 1982. The whole vegetation period (April-September) of 2006 is regarded as moderately dry (75,1% of the precipitation norm) and very warm (with a temperature deviation of 2.3oC above the norm). Decreasing values of SPI in most months of the vegetation period, especially in August, indicate an increasing risk of drought in the Szczecin Lowlands.
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keywords:
standardized precipitation index SPI, drought intensity, multi-year variability
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original in:
Polish
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