Cmaqv4 7 1 coming soon
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CMAQv4.7.1 (coming soon). (1) Updates to AQCHEM. Force mass balance for the last time-step in the cloud Imposed a 1 second time-step for the remainder of the cloud lifetime after 100 ‘iterations” Limit oxidized amount to mass available to insure mass conservation

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CMAQv4.7.1 (coming soon)

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Cmaqv4 7 1 coming soon

CMAQv4.7.1 (coming soon)

(1) Updates to AQCHEM

  • Force mass balance for the last time-step in the cloud

    • Imposed a 1 second time-step for the

    • remainder of the cloud lifetime after

    • 100 ‘iterations”

    • Limit oxidized amount to mass

    • available to insure mass conservation

    • Implemented steady state assumption for

    • OH

    • Only let sulfur chemistry control the cloud

    • timestep

    • Previously, reactions of OH, GLY,

    • MGLY, and Hg (for multipollutant model)

    • also controlled the timestep


Cmaqv4 7 1 coming soon1

CMAQv4.7.1 (coming soon)

(2) Updates to Vertical Advection

  • Additional divergence-based

  • constraint on advection timestep

  • Vertical advection now represented

  • with PPM to limit numerical

  • diffusion


Cmaqv4 7 1 coming soon2

CMAQv4.7.1 (coming soon)

(3) Multi-pollutant model updates

  • Bug fix to facilitate inline emissions option

  • Mercury

    • Dicarboxylic acid reduction mechanism applied to aqueous phase oxidized mercury species

    • Cl oxidation pathway based on Donohoue et al 2005 J. Phys. Chem. A 109(34)

  • Modified Acrolein mechanism in CB05 to correct for unreasonably high unit yields of Acrolein from 1,3-Butadiene tracer reactions


Cmaqv4 7 1 coming soon3

CMAQv4.7.1 (coming soon)

(4) Photolysis

  • Expanded lookup tables to facilitate applications across the globe and extended vertical domain to 20km

    • Previous version latitudes 10-60 N

      (5) Instrumented Models

  • DDM

  • Sulfur Tracking

  • Primary Carbon Apportionment


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