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Sensitivity of direct effect to aerosol treatment (first results)

Sensitivity of direct effect to aerosol treatment (first results) . Peter Hess. Current Aerosol Types . - Dust : 4 size bins - Seasalt : 4 size bins - OC1, OC2 : OC1->OC2 (1.2 days) - BC1, BC2 : BC1->BC2 (1.2 days) - Sulfate (Several different Treatments)

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Sensitivity of direct effect to aerosol treatment (first results)

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  1. Sensitivity of direct effect to aerosol treatment (first results) Peter Hess

  2. Current Aerosol Types -Dust: 4 size bins -Seasalt: 4 size bins -OC1, OC2: OC1->OC2 (1.2 days) -BC1, BC2: BC1->BC2 (1.2 days) -Sulfate (Several different Treatments) -Ammonium nitrate (Only when running w/ chemistry) -SOA (Only when running w/ chemistry)  All are considered externally mixed.

  3. Prescribed (4th Assessment Report) No Chemistry Option Prognostic OC, BC, Dust, SeaSalt Sulfate with input oxidants (NO3, O3, HO2) No NH4NO3 Chemistry Option Prognostic OC, BC, Dust, SeaSalt Sulfate NH4NO3, simple partitioning with SO4. SOA Aerosol Parameterizations(Simple -> Complex) C SO NH4NO3 C S NH4NO3

  4. Recommendation for 5th Assessment • Accuracy of Input Oxidant Approach ? • Importance of Ammonium Nitrate ? • Do we need to include in some form?

  5. Simulations (Complex to Simple) • Aerosols: All Chemistry: Yes 2) Aerosols: No ammonium nitrate, SOA Chemistry: Yes • Aerosols: All, but SO2 emissions at 50% Chemistry: Yes • Aerosols: All, but sulfate diagnosed using Rasch code (designed for prescribed oxidants) Chemistry: Yes • Aerosols: Sulfate from Rasch code. Chemistry: Input oxidants NH4NO3 S C C NH4NO3 S C NH4NO3 S NH4NO3 SO C C NH4NO3 SO

  6. MISER 0.6 CAM C 0.3 NH4NO3 S 0.0

  7. Pfister et al, 2007

  8. (courtesy Colette Heald)

  9. Full Chemistry vs Prescribed Oxidants Difference Fields: C NH4NO3 S NH4NO3 SO minus C 0.2 0.0 AOD -0.2

  10. IMPACT of AMMONIUM NITRATE Difference Fields: C NH4NO3 S C NH4NO3 S minus 0.2 0.0 AOD -0.2 6. 3. 0. FSNTOAC (w/m2) -3. -6.

  11. IMPACT of AMMONIUM NITRATE Difference Fields: C NH4NO3 S C NH4NO3 S minus 0.25 0.2 AOD NH4NO3 0.1 0.0 -0.25 -0.2 AOD SO4 -0.1 0.0

  12. IMPACT of AMMONIUM NITRATE w/ 50% SO2 Emissions C NH4NO3 S C NH4NO3 S 50% minus 0. AOD -.3 -.6 -.01 -.12 FSNTOAC (w/m2) -1. -3.5

  13. IMPACT of AMMONIUM NITRATE w/ 50% SO2 Emissions Difference Fields: C NH4NO3 S C NH4NO3 S minus 0.25 0.0 AOD -0.25 6. 3. FSNTOAC (w/m2) 0. -3. -6.

  14. Full Chemistry vs Prescribed Oxidants Difference Fields: C NH4NO3 S C NH4NO3 SO minus Maximum AOD is 0.1

  15. Prescribed vs Active Chemistry Difference Fields: C NH4NO3 S0 C NH4NO3 SO minus 0.12 AOD 0.0

  16. Conclusions • Sulfate with input oxidants – works well! • Large regional differences with NH4NO3 • Next Steps?

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