REPORT FROM ICP WORKSHOP

Transcription

1 REPORT FROM ICP WORKSHOP (International Cooperative Programme on Modelling and Mapping of Critical Loads and Levels and Air Pollution Effects, Risks and Trends) CONVENTION ON LONG-RANGE TRANS-BOUNDARY AIR POLLUTION April 2011, Bilthoven, The Netherlands Linda Pardo, US Forest Service

2 Outline Overview of US submission of data Issues for Relevant topics of discussion from meeting

3 Call for data New deposition mapping scale (5 km x 5 km) New values for Empirical CL for N Linking the Very Simple Dynamic Model (VSD+) to a simple vegetation model (VEG)

4 US Submission presented Surface water CL for S+N Forest soils CL S+N Empirical CL Ecoregion based (Pardo et al. 2011) Lichens model (Geiser et al. 2010)

5 Aggregation issues Multiple values for the same grid cell: different habitats When mapping, aggregate: 95 th percentile average area-weighted average

6 J12 12 km x 12 km Grid Single value 12 km Multiple values where EcoRegions intersect the grid 2 1 I12

7 Aggregation issues Which value to use: average, range, min Multiple calculations (crit thresholds) Multiple receptors (organisms) Multiple values (different studies) for the same grid cell: average, area-weighted average, min, range, best

8 Background for Empirical N CLs Based on Pardo et al. in press synthesis By ecoregion Ecoregions Level 1 Map (CEC, EPA) 4 main receptors Mycorrhizal fungi Lichens Herbaceous species and shrubs Forest ecosystems Based on empirical lichens model (Geiser et al. 2010)

9 Commission for Environmental Cooperation. 1997

10 Empirical N Critical loads (kg/ha/yr) Pardo et al Ecoregion I Fungi Lichens Herbaceous Forests Tundra Taiga Northern Forests >7 - <21 >3 - <26 NW Forested Mtns Marine West Coast Eastern Temperate Forests <17.5 >3-8 Great Plains NA Deserts Mediterranean CA Temperate Sierras 4-7 Tropical Wet Forest <5-10

11 Empirical N Critical loads (kg/ha/yr) Pardo et al Ecoregion I Fungi Lichens Herbaceous Forests Tundra 1 1 Taiga Northern Forests 5 4 >7 >3 NW Forested Mtns Marine West Coast Eastern Temperate Forests 5 4 <17.5 >3 Great Plains 12 5 NA Deserts 3 3 Mediterranean CA Temperate Sierras 4 Tropical Wet Forest <5 -Red indicate value used

12 Empirical N Critical loads (kg/ha/yr) Pardo et al Ecoregion I Fungi Lichens Herbaceous Forests Mean Tundra Taiga Northern Forests 5 4 >7 >3 4.2 NW Forested Mtns Marine West Coast Eastern Temperate Forests 5 4 <17.5 >3 7.4 Great Plains NA Deserts Mediterranean CA Temperate Sierras 4 4 Tropical Wet Forest <5 5

13 Aggregation issues Which value to use: average, range, min Multiple calculations (crit thresholds) Multiple receptors (organisms) Multiple values (different studies) for the same grid cell: average, area-weighted average, min, range, best

14 Issues to consider 1. Other ecosystem types besides forests for CL S+N shrubs, grasslands, wetlands 2. What is total ecosystem area (by ecosystem type)? what % are ecosystems of total country area? 3. Show CL/exceedance as cumulative frequency distribution 4. Mapping 95 th percentiles

15 Issues to consider cont d 5. Cost benefit analysis (human health, work loss hours etc.)other ecosystem types besides forests for CL S+N 6. Border issues work with Canada to make border less visible 7. Country reports review others in considering what a US country report would look like 8. Documenting work that was done (and to dos)

16 Issues to consider cont d 9. Biodiversity modelling 10. Data necessary for assessing vegetation response to N (Ellenberg values) 11. VSD+ VEG modelling

17 Next Steps Refining Empirical N CL Geiser model Ecoregion approach improving ability to determine where within the CL range a given site is likely to fall Refinements for CL S+N Critical thresholds Data sources Aggregation Issues Dynamic modelling