lec18 (1) - 12 Examples of Chemical Transport Models,...

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12 Examples of Chemical Transport Models, contd. (b) NCAR Community Climate Model (CCM)(1994) CCM2 characteristics (P. Rasch & D. Williamson) Vertical: () s P terrain following below 100mb level P 18 levels P above 100mb level lid at 2.9mb σ= Horizontal: Spectral (T42 with 128 longitude and 64 latitude (gaussian- quadrature grid) Time: , semi-implicit leap-frog t2 0 m i n Δ= Transport: semi-Lagrangian* scheme for all chemical species (including ) applied on the above grid 2 HO Subgrid-scale processes: planetary boundary layer includes eddy diffusivity and counter-gradient transport, bulk atmosphere includes vertical diffusion scheme and gravity wave effects, moist convection by the three-level (entrainment, condensation, detrainment) “Hack” scheme *Semi-Lagrangian computes current states from past states using integration of Lagrangian form of continuity equation along a back trajectory with the point of origin values obtained by interpolation from adjacent grids point of origin ( ξ ) [] n1 n ii ij i trajectory PL XX
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This note was uploaded on 11/27/2011 for the course CHEMICAL E 20.410j taught by Professor Rogerd.kamm during the Spring '03 term at MIT.

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lec18 (1) - 12 Examples of Chemical Transport Models,...

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