POMI Po Valley Model Intercomparison Exercise CAMx model overview In cooperation with AMA - MI.
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Transcript of POMI Po Valley Model Intercomparison Exercise CAMx model overview In cooperation with AMA - MI.
POMIPo Valley Model Intercomparison
Exercise
CAMx model overview
In cooperation with AMA - MI
Ispra - March 7, 2008 G. Pirovano - CESI Ricerca
CAMx Overview
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 (1st level) and point emissions
– dry deposition: resistance scheme
– wet deposition: both gas and particle; within and below cloud
– Plume in Grid (Pig) submodel implemented
– Nesting Two way flexible nesting implemented
Ispra - March 7, 2008 G. Pirovano - CESI Ricerca
CAMx Overview
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)SO4
=, NO3-, NH4
+, H2O, Na+, Cl-, SOA (secondary)
Ispra - March 7, 2008 G. Pirovano - CESI Ricerca
CAMx Probing tools
OSAT - PSATOzone/Particulate Source Apportionment Technology
PSATPM10
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
CAMx Simulations 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 / derived from 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
CAMx Simulations 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: • EPA’s BEIS, GloBEIS, MEGAN (supports CB05 and SOA updates in
v4.5)
Ispra - March 7, 2008 G. Pirovano - CESI Ricerca
CAMx Simulations outline
– Further analysis (optional):
•CB-05 versus CB-IV•2-way nesting versus 1-way nesting•PSAT analysis