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vol. 3, nr. 1 (2004)
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Standardized climatic water balance as drought index
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Leszek Łabędzki1, Bogdan B±k2
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1 Institute for Land Reclamation and Grassland Farming, Regional Research Centre,Al. Ossolińskich 12, 85-093 Bydgoszcz |
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2 Bydgoszcz Weather Bureau, ul. Bołtucia 10/20, 85-791 Bydgoszcz |
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vol. 3 (2004), nr. 1,
pp. 117-124
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abstract:
Assessing drought severity is an element of drought monitoring. The assessment of severity and frequency of dry periods in a given severity class depends on the assumed criteria of drought. Using the series of precipitation records in the growing seasons of 1972-2002 from the meteorological station Frydrychowo-IMUZ located in the upper Notec river valley, the standardized climatic water balance SB is calculated. Three classes of drought have been distinguished in the range of negative values of SB: moderately dry, very dry and extremely dry. Frequencies of months and growing seasons in a given class have been determined. The results are compared with the classification based on the relative precipitation index RPI and the standardized precipitation index SPI. According to SB, 69 months occurred in three classes of drought altogether, according to SPI - 60 months and according to RPI - 82 months. Taking into account meteorological conditions of evaporation in the SB index, diminished the assessment of drought severity (periods were classified in the lower class of drought) in comparison with the indices based only on precipitation.
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keywords:
drought, climatic water balance, SPI
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original in:
Polish
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