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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

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CMAQv4.7.1 (coming soon)

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  1. 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

  2. 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

  3. 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

  4. 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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