Past and current water composition of surface waters in Latvia MĀRIS KĻAVIŅŠ, ILGA KOKORĪTE, VALERY RODINOV University of Latvia.

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Presentation transcript:

Past and current water composition of surface waters in Latvia MĀRIS KĻAVIŅŠ, ILGA KOKORĪTE, VALERY RODINOV University of Latvia

Chemical composition of surface waters of Latvia

Piper diagram of surface waters of Latvia

Long term changes of surface waters

Changes of COD and water color

Trends of water composition changes accordingly to ( ) MANN- KENDALL test Increasing concentrations, p<0,05 Decreasing concentrations, p<0,05

Factors influencing water composition? Changes in human loading Changes in landuse Climate change

Changes of human loading

Impact of landuse un concentrations of nutrients

Export of SO 4 2-, kg/km 2 /year

Export of nitrates kg/km 2 /year

River discharge – major factor controlling concentrations and loading of dissolved substances Gauja - Sigulda ( )

River discharge – major factor controlling concentrations and loading of dissolved substances

Changes of temperature and precipitation for the Meteorological Station Rīga-University

Long term changes of river ice regime

Long term changes of river discharge

Major large scale atmospheric circulation processes

Long term changes of large scale atmospheric circulation processes

Deviation of large scale atmospheric circulation processes

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.

Changes of Venta and Pärnu discharges and index of NAO data were smoothed with a 10-year moving average

Long term changes of water runoff and inorganic ion export

Factors influencing aquatic chemistry are diverse and they should be considered at the development of monitoring programs

Thank you!