Hourly total gaseous mercury (TGM) concentrations at three monitoring sites (receptors) in Ontario were predicted for four selected periods at different seasons in 2002 using the Stochastic Time-Inverted Lagrangian Transport (STILT) model, which transports Lagrangian air parcels backward in time from the receptors to provide linkages to the source region in the upwind area. The STILT model was ...

This performance evaluation compares a full annual simulation (2001) of Community Multi-scale Air Quality (CMAQ) (Version 4.4) covering the contiguous United States against monitoring data from four nationwide networks. This effort, which represents one of the most spatially and temporally comprehensive performance evaluations of the model, reveals that CMAQ varies considerably in its ability t...

A visualization tool for EPA’s Community Multiscale Air Quality modeling system, VisCMAQ, which is developed in this study as an OpenGL based visualization tool that has the capability to render data on both regular and irregular grids. The goal of this project is to enhance the VisCTM model, which was created last summer with additional flexibilities such as reading from NetCDF files. Also, th...

Evaluation of MM5-EMICAT2000-CMAQ performance and sensitivity in complex terrain: highresolution application to the northeastern Iberian Peninsula Pedro Jiménez, Oriol Jorba, René Parra and José M. Baldasano Barcelona Supercomputing Center – Centro Nacional de Supercomputación (BSC-CNS). Jordi Girona 29, 08034 Barcelona, Spain. Laboratory of Environmental Modeling. Universitat Politècnica de Ca...

[1] An initial evaluation of the Models-3 Community Multiscale Air Quality (CMAQ) model aerosol component reveals CMAQ’s varying ability to simulate observed visibility indices and aerosol species concentrations. The visibility evaluation, using National Weather Service observations from 139 airports for 11–15 July 1995, shows that CMAQ reasonably captured the general spatial and temporal patte...

Some extensive numerical simulations of the atmospheric composition fields in Bulgaria have been recently performed. The US EPA Model-3 system was chosen as a modelling tool. As the NCEP Global Analysis Data with 1 degree resolution was used as meteorological background, the MM5 and CMAQ nesting capabilities were applied for downscaling the simulations to a 3 km resolution over Bulgaria. The TN...

This paper studies two high-pollution episodes over Greater Tokyo: 9 and 10 December 1999, and 31 July and 1 August 2001. Results obtained with the chemistry-transport model (CTM) Polair3D are compared to measurements of inorganic PM2.5. To understand to which extent the aerosol processes modeled in Polair3D impact simulated inorganic PM2.5, Polair3D is run with different options in the aerosol...