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ITEM 4 Common Workplan items ICP Waters ECE/EB.AIR/WG.1/2010/6

ITEM 4 Common Workplan items ICP Waters ECE/EB.AIR/WG.1/2010/6. 1. Targets and ex-post application. MAGIC modeling of calibrated sites in Norway and Czech rep, possible also some other countries Relate results to possibilities for biological recovery (increase in ANC)

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ITEM 4 Common Workplan items ICP Waters ECE/EB.AIR/WG.1/2010/6

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  1. ITEM 4 Common Workplan itemsICP WatersECE/EB.AIR/WG.1/2010/6

  2. 1. Targets and ex-post application • MAGIC modeling of calibrated sites in Norway and Czech rep, possible also some other countries • Relate results to possibilities for biological recovery (increase in ANC) • Use long-term monitoring data on water chemistry and biota when possible • Present results for discussions at JEG-meeting in late October

  3. 2. Robustness • There is generally good agreement between exceedence of critical load for acidity and the acid neutralizing capacity (ANC) in surface waters. • Exceptions are sites with time delays between changes in S+N deposition and response in water chemistry. • Time delays are well explained by known processes in catchments and waters, and can be modelled

  4. There is also good agreement between chemical criteria (ANC) and biological response 2. Robustness

  5. 3. Links with biodiversity • The major effect from S- and N-deposition on aquatic ecosystems is the loss of biodiversity. • 10 000 stocks of brown trout, roach, Arctic char, and perch, have recently disappeared from Fennoscandian lakes (Tammi, 2003). • A major part of the invertebrate fauna is also lost in acidifiedlakes and rivers due to acidification. • Recovery of the biodiversity has begun in many regions, but lags behind chemical recovery.

  6. 3. Links to biodiversity;Areas with lost or damaged fish populations due to acid rain

  7. 3. Links to biodiversity;recovery of fish and ivertebrates due to redusced S-deposition Deposition  water chemistry  biota (fish and inverterates)

  8. 4. Trends in selected monitored/modeled parameters

  9. 4. Trends in selected monitored/modelled parameters Trends in sulphate; 1990-1999, 2000-2009 • Still decreasing sulphate trends in most regions, but trends are slower rate

  10. 4. Trends in selected monitored/modelled parameters Trends in ANC; 1990-1999, 1999-2008 • Still increasing trends in ANC but at a lower rate than in the 90’ies

  11. Increasing trends, but at a lower rate in recent years compared to the 90’ies 4. Trends in selected monitored/modelled parameters -trends in biota (invertebrates)

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