1 / 21

Critical Loads Meeting at Mission Inn, Riverside CA February 15-18 2005 Jack Cosby

Critical Loads Meeting at Mission Inn, Riverside CA February 15-18 2005 Jack Cosby University of Virginia Scientific Justification for Using the Critical Loads Approach Geochemical Processes Patterns of Response Dynamics of Response. Critical Loads Meeting at Mission Inn, Riverside CA

kasi
Download Presentation

Critical Loads Meeting at Mission Inn, Riverside CA February 15-18 2005 Jack Cosby

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Critical Loads Meeting at Mission Inn, Riverside CA February 15-18 2005 Jack Cosby University of Virginia Scientific Justification for Using the Critical Loads Approach Geochemical Processes Patterns of Response Dynamics of Response

  2. Critical Loads Meeting at Mission Inn, Riverside CA February 15-18 2005 Jack Cosby University of Virginia Scientific Justification for Using the Critical Loads Approach Geochemical Processes Patterns of Response Dynamics of Response

  3. Atmosphere Al(OH)3 CO2 H+ Al 3+ Soil and Soil Water Al-X BC-X BC+ BC+ ANC > 0.0 Stream Water HCO3 HCO3

  4. Atmosphere Al(OH)3 CO2 Al 3+ H+ Soil and Soil Water Al-X Al 3+ CO2 Al 3+ ANC = 0.0 HCO3 H+ OH - Stream Water Al(OH)3 HCO3

  5. Atmosphere Long-term Steady-state Condition Weathering rate = ANC production rate Al(OH)3 CO2 H+ Al 3+ Soil and Soil Water Al-X BC-X BC+ Primary Mineral BC+ Weathering BC+ ANCSS > 0.0 Stream Water HCO3 HCO3

  6. H2SO4 Atmosphere Effects of Acidic Deposition on Soils and Drainage Waters Al(OH)3 CO2 H+ Al 3+ Soil and Soil Water Al-X BC-X BC+ BC+ Weathering BC+ ANCSS > 0.0 Stream Water HCO3 HCO3

  7. H2SO4 Atmosphere Initial Response to Acidic Deposition - without mobile anion - Buffering by adsorption of sulphate anion Al(OH)3 CO2 H+ Al 3+ SO4-X Soil and Soil Water Al-X BC-X H+OH- BC+ BC+ Weathering BC+ ANC > 0.0 Stream Water 2- HCO3 SO4 HCO3

  8. H2SO4 Atmosphere Initial Response to Acidic Deposition - with mobile anion - Buffering by cation exchange Al(OH)3 H+ CO2 H+ Al 3+ SO4-X Soil and Soil Water Al-X BC-X BC+ BC+ Weathering ANC > 0.0 ( neutral salt of sulphate ) BC+ Stream Water 2- 2- 2- HCO3 SO4 SO4 SO4 HCO3

  9. H2SO4 Atmosphere Long-term Response to Acidic Deposition depletion of soil base saturation Al(OH)3 H+ CO2 H+ Al 3+ SO4-X Soil and Soil Water Al-X BC+ Al 3+ BC+ Weathering CO2 BC+ Al 3+ Final ANC depends on relative magnitudes of BC and SO4 2- 2- 2- HCO3 SO4 SO4 SO4 Stream Water H+ OH - ??? Al(OH)3 HCO3

  10. H2SO4 Atmosphere Long-term Response to Acidic Deposition depletion of soil base saturation Al(OH)3 H+ CO2 H+ Al 3+ SO4-X Soil and Soil Water Al-X BC+ Al 3+ BC+ Weathering CO2 BC+ Al 3+ 2- 2- 2- If BC > SO4 ANC > 0.0 ( but < ANCSS ) HCO3 SO4 SO4 SO4 Stream Water H+ OH - Al(OH)3 HCO3 HCO3

  11. H2SO4 Atmosphere Long-term Response to Acidic Deposition depletion of soil base saturation Al(OH)3 H+ CO2 H+ Al 3+ SO4-X Soil and Soil Water Al-X BC+ Al 3+ BC+ Weathering CO2 BC+ Al 3+ 2- 2- 2- HCO3 SO4 SO4 SO4 If SO4 > BC ANC < 0.0 Stream Water H+ OH - H+ Al3+ Al(OH)3 HCO3

  12. Atmosphere Initial Recovery from Acidic Deposition replenishment of soil base saturation Al(OH)3 CO2 H+ Al 3+ Soil and Soil Water Al-X BC+ Al 3+ BC+ Weathering CO2 Al 3+ HCO3 ANC ~ 0.0 ( ANC < ANCSS ) Stream Water H+ OH - Al(OH)3 HCO3

  13. Atmosphere Final Recovery from Acidic Deposition soil base saturation restored Al(OH)3 CO2 H+ Al 3+ Soil and Soil Water Al-X BC-X BC+ BC+ Weathering BC+ Stream Water ANC = ANCSS HCO3 HCO3

  14. Critical Loads Meeting at Mission Inn, Riverside CA February 15-18 2005 Jack Cosby University of Virginia Scientific Justification for Using the Critical Loads Approach Geochemical Processes Patterns of Response Dynamics of Response

  15. Use Dynamic Model for Quantitative Understanding of Changes in Soil Properties Responsible for Time Scales of Acidification and Recovery

  16. Use Dynamic Model for Quantitative Understanding of Changes in Soil Acid-Base Properties During Acidification and Recovery

  17. Use Dynamic Model for Quantitative Understanding of Changes in Soil Acid-Base Properties During Acidification and Recovery

  18. Use Dynamic Model for Quantitative Understanding of Changes in Soil Acid-Base Properties During Acidification and Recovery

  19. Use Dynamic Model for Quantitative Understanding of Changes in Soil Acid-Base Properties During Acidification and Recovery

  20. Critical Loads Meeting at Mission Inn, Riverside CA February 15-18 2005 Jack Cosby University of Virginia Scientific Justification for Using the Critical Loads Approach Geochemical Processes Patterns of Response Dynamics of Response

  21. Stage 1 Stage 2 Stage 3 Stage 4 Stage 5 Critical load Acid deposition Chemical target (ANC) Chemical response Biological response Critical response DDT RDT t1 t2 t3 t4 t5 t6 Recovery delay timeFrom the UN ECE ICP mapping and modeling (Max Posch) DDT: Damage delay time RDT: Recovery delay time

More Related