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Surface water ecosystems

ICP waters; use of data from EMEP …and some results Brit Lisa Skjelkvåle and Heleen de Wit Norwegian Institute for Water Research. ICP Waters: International cooperative programme on assessment and monitoring effects of air pollution on rivers and lakes Programme aims.

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Surface water ecosystems

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  1. ICP waters; use of data from EMEP …and some resultsBrit Lisa Skjelkvåle and Heleen de WitNorwegian Institute for Water Research

  2. ICP Waters: International cooperative programme on assessment and monitoring effects of air pollution on rivers and lakesProgramme aims • Assess the degree and geographic extent of the impact of atmospheric pollution, in particular acidification, on surface waters • Collect information to evaluate dose/response relationships • Describe and evaluate long-term trends and variation in aquatic chemistry and biota attributable to atmospheric pollution

  3. Surface water ecosystems

  4. The recovery process • (conceptual model by Posch et al.) • Simplified description of development of • acid deposition, • a lake chemical variable (ANC) • the corresponding biological response Damage Recovery

  5. Lake Saudlandsvatn in Southern Norway

  6. Observations L.Saudlandsv Reference. Hestagen et al 2011, Sci Tot Environ

  7. Ex-post depositionscenarios for L.SaudlandsvatnReference:WGE Joint report

  8. Ex-post water chemistryscenarios for L.SaudlandsvatnNAT – scenario MAGICReference:WGE Joint report

  9. Exceedance of CL for acidification of surface waters in Norway using NAT, PRI and MFR scenarios The calculated exceedance of critical loads for acidification of surface waters, using the FAB model (Reference: Letter to KLIF, T. Larssen Dec 2010)

  10. ICP Waters network Chemistry at all sites Biology at selected sites and not in all countries

  11. Trends in ANC 1990-1999 and 1999-2008 ICP Waters sites All median trend slopes in all regions are positiv Slightly lower increase 1999-2008 than 1990-1999

  12. Some reflections • The aim of the effects work is to: • document the effects of decreases or increases in air pollution by monitoring sensitive parts of natural and seminatural ecosytems, health and materials • document need for further emission reductions • From ICP Waters reporting: • The consistent pattern of chemical recovery across a large number of sites is the strongest evidence that emission control programmes are effective. In many areas, water quality is now sufficient for the return of acid-sensitive aquatic biota.

  13. ..and some more reflections • ICP Waters needs: • Measured precipitation chemistry for relating observed trends in water chemistry with observed precipitation chemistry • Historical S and N (and base cation) deposition for calibrating dynamic models • Future S and N deposition scenarios for calculating • possible water chemical responses • possible biological responses • exceedance of CL • Better cooperation EMEP - WGE; • define joint projects and publish results together

  14. Thank you!

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