Critical Loads - Monitoring Strategy - Section 2a

Improving Critical Loads: General Guidelines

  1. Identify the CL exceedance estimates in need of refinement through additional monitoring (as opposed to estimates requiring the development of target loads). 
    • Examples include: CLs of acidity for surface waters, terrestrial CLs of acidity for forested ecosystems, or empirical CLs of nutrient nitrogen.
  2. If several CLs are exceeded and in need of refinement, prioritize monitoring efforts using the findings from Step 2 of the Critical Load Strategy.  In Step 2 you determined whether acidification, nutrient nitrogen, or both were concerns for the forest. 

  3. Identify the resource(s) that must be monitored to refine the CL exceedance estimates identified above.  
    • Examples include: surface water chemistry samples to refine CLs of acidity for surface waters, surface water or soil chemistry samples to refine CLs of acidity for forested ecosystems, or lichen monitoring to refine empirical CLs of nutrient nitrogen.

      More details are available in the following monitoring sections.
  4. Have a clear objective for monitoring. 
    • For example: establish an initial surface water survey to calculate CLs of acidity across the forest, expand the existing surface water chemistry data to improve reliability of forest-wide CL estimates and allow development of a TL, refine terrestrial CLs of acidity for forested ecosystems in sensitive watersheds, refine the nutrient N CLs for lichens.
  5. Always use national and regional protocols when available.
  6. Use the CL Implementation Strategy to stratify potential monitoring sites. 
    • For example: the CLs of acidity for forested ecosystems can be used to identify area at high risk.