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Published byEarl Peters Modified over 9 years ago
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Past and current water composition of surface waters in Latvia MĀRIS KĻAVIŅŠ, ILGA KOKORĪTE, VALERY RODINOV University of Latvia
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Chemical composition of surface waters of Latvia
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Piper diagram of surface waters of Latvia
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Long term changes of surface waters
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Changes of COD and water color
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Trends of water composition changes accordingly to (1977.-2001.) MANN- KENDALL test Increasing concentrations, p<0,05 Decreasing concentrations, p<0,05
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Factors influencing water composition? Changes in human loading Changes in landuse Climate change
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Changes of human loading
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Impact of landuse un concentrations of nutrients
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Export of SO 4 2-, kg/km 2 /year
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Export of nitrates kg/km 2 /year
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River discharge – major factor controlling concentrations and loading of dissolved substances Gauja - Sigulda (1977.-1997.)
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River discharge – major factor controlling concentrations and loading of dissolved substances
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Changes of temperature and precipitation for the Meteorological Station Rīga-University
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Long term changes of river ice regime
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Long term changes of river discharge
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Major large scale atmospheric circulation processes
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Long term changes of large scale atmospheric circulation processes
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Deviation of large scale atmospheric circulation processes
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Long term change of mean annual discharge of the rivers in Baltic region and precipitations. 1 – precipitation (Station Rīga-University); 2 - Nemunas River; 3 - Daugava River; 4 – Narva River; 5 – Parnu River. Data were smoothed with a 6-year moving average.
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Changes of Venta and Pärnu discharges and index of NAO data were smoothed with a 10-year moving average
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Long term changes of water runoff and inorganic ion export
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Factors influencing aquatic chemistry are diverse and they should be considered at the development of monitoring programs
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Thank you!
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