Influence of initial and boundary conditions for ozone modeling in very complex terrains: A case study in the northeastern Iberian Peninsula

  • Authors:

  • Pedro Jiménez;René Parra;José M. Baldasano

  • Affiliations:

  • Barcelona Supercomputing Center-Centro Nacional de Supercomputación (BSC-CNS), Jordi Girona 29, 08034 Barcelona, Spain;Laboratory of Environmental Modeling, Universitat Politècnica de Catalunya (UPC), Avda. Diagonal 647 10.23, 08028 Barcelona, Spain;Barcelona Supercomputing Center-Centro Nacional de Supercomputación (BSC-CNS), Jordi Girona 29, 08034 Barcelona, Spain and Laboratory of Environmental Modeling, Universitat Politècnica d ...

  • Venue:
  • Environmental Modelling & Software
  • Year:
  • 2007

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Abstract

Initial (IC) and boundary conditions (BC) are required in order to solve the set of stiff differential equations included in air quality models. In this work, the influences of IC-BC are analyzed in the northeastern Iberian Peninsula (NEIP) by applying MM5-EMICAT2000-CMAQ. A multiscale-nested configuration has been used to generate the IC-BC. The wider domain (D1) covers an area of 1392x1104km^2 centered in the Iberian Peninsula. Domain 2 (D2) covers an area of 272x272km^2 in the NEIP (D2) with high spatial and temporal resolution. The information related to BC has been supplied to D2 through one-way nesting. Different scenarios were considered (base case, increments of +50% in ozone (O"3) IC, +50% in O"3 BC, +50% in O"3 precursors IC, +50% in O"3 precursors BC and clean BC). The impacts of the IC on a site decrease with simulation time. Focusing on the conditions within the PBL, a 48-h spin-up time is sufficient to reduce the impact factor of IC to 10% or less for O"3 since the influence of pervasive local emissions. The influences of BC are more important for areas near domain boundaries, especially in areas where the contribution of O"3 precursors is due to a short-medium range transport.