POMI Po Valley Model Intercomparison Exercise CAMx model overview In cooperation with AMA - MI.

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Presentation transcript:

POMI Po Valley Model Intercomparison Exercise CAMx model overview In cooperation with AMA - MI

Ispra - March 7, 2008 G. Pirovano - CESI Ricerca CAMxOverview CAMx v. 4.5 (Environ International Corporation, Ca) Eulerian photochemical transport and dispersion model –grid configuration : horizontal - cartesian projections and geodetic (lat/lon) vertical - generic terrain following (w is internally computed) 1- and 2-way nesting allowed –horizontal advection scheme : Bott (Bott A., 1989 ) or Piecewise Parabolic Method (PPM) (Colella & Woodward, 1984) –vertical advection/diffusion scheme : fully implicit –emissions:Diffuse (1 st level) and point emissions –dry deposition : resistance scheme –wet deposition : both gas and particle; within and below cloud –Plume in Grid (Pig) submodel implemented –NestingTwo way flexible nesting implemented

Ispra - March 7, 2008 G. Pirovano - CESI Ricerca CAMxOverview CAMx v. 4.5 (Environ International Corporation, Ca) Eulerian photochemical transport and dispersion model –chemical modules : gas phase: SAPRC99 / CB-IV / CB-05 gas phase integrator: CMC / IEH / LSODE thermod. equilibrium:ISORROPIA SOA:SOAP (Strader et al., 1998) –aerosol dynamic:Coarse/Fine modes or size bin approach –chemical species: Crustal, Primary Organic, Elemental Carbon (primary) SO 4 =, NO 3 -, NH 4 +, H 2 O, Na +, Cl -, SOA (secondary)

Ispra - March 7, 2008 G. Pirovano - CESI Ricerca CAMxProbing tools OSAT - PSAT Ozone/Particulate Source Apportionment Technology PSAT PM10 S1 S2 Other PSAT Advantages Time saving (one simulation) Mass consistency Fully traceable Tracks sulfate, nitrate, organics, primary groups Tracks by category + region

Ispra - March 7, 2008 G. Pirovano - CESI Ricerca CAMxSimulations outline –Meteorology : Horizontal Interpolation onto the output grid (if needed) Aggregation of vertical levels (only over PBL) - No Interpolation Kv Computation:TKE / Similarity theory (e.g. CMAQ approach) Water Content:3D prognostic fields / derivedfrom rainfall rate –Boundary Conditions: Horizontal and vertical interpolation of the large scale fields onto CAMx grid Chemical speciation and size disaggregation

Ispra - March 7, 2008 G. Pirovano - CESI Ricerca CAMxSimulations outline –Anthropogenic emissions : Application of SMOKE emission model Speciation and lumping of NMVOC Speciation and size disaggregation of PM emissions –Sea salt emissions: CAMx pre-processor, function of wind speed –Biogenic Emissions: EPAs BEIS, GloBEIS, MEGAN (supports CB05 and SOA updates in v4.5)

Ispra - March 7, 2008 G. Pirovano - CESI Ricerca CAMxSimulations outline –Further analysis (optional): CB-05 versus CB-IV 2-way nesting versus 1-way nesting PSAT analysis