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A COUPLED LAND-SURFACE AND DRY DEPOSITION MODEL AND COMPARISON TO FIELD MEASUREMENTS OF SURFACE HEAT, MOISTURE, AND OZONE FLUXES
Citation:
Pleim, J E. A COUPLED LAND-SURFACE AND DRY DEPOSITION MODEL AND COMPARISON TO FIELD MEASUREMENTS OF SURFACE HEAT, MOISTURE, AND OZONE FLUXES. JOURNAL OF WATER, AIR, AND SOIL POLLUTION Focus 1(5/6):243-252, (2001).
Impact/Purpose:
This task objective is the development and improvement of state-of-the-science meteorology models and contributing process parameterizations for use in advanced air quality simulation model systems such as the Community Multi-scale Air Quality (CMAQ) modeling system and for other modeling studies and situations involving transport and dispersion of pollutants. Components of this work include: (a) improved meteorological and transport modeling, (b) improved meteorological modeling physics, (c) physical modeling of flows- building wakes, complex terrain, urban canyons, (d) modeling of transport and dispersion of specialized situations and (e) develop AERMOD (AMS/EPA Regulatory MODel).
Description:
We have developed a coupled land-surface and dry deposition model for realistic treatment of surface fluxes of heat, moisture, and chemical dry deposition within a comprehensive air quality modeling system. A new land-surface model (LSM) with explicit treatment of soil moisture and evapotranspiration and an indirect soil moisture nudging scheme has been added to a mesoscale meteorology model. The new dry deposition model uses the same aerodynamic and bulk stomatal resistances computed for evapotranspiration in the LSM. This provides consistent land-surface and boundary layer properties across the meteorological and chemical components of the system. The coupled dry deposition model also has the advantage of veing able to respond to changing soil moisture and vegetation conditions. Modeled surface fluxes of sensible and latent heat as well as ozone dry deposition velocities were compared to two field experiments: a soybean field in Kentucky during summer of 1995 and a mixed forest in the Adirondacks of New York in July 1998.