AERMOD View: Working with Different Model Versions
Numerous versions of the AERMOD model have been released over the years. These updates include new algorithms, enhancements to existing features, bug fixes, and more.
Numerous versions of the AERMOD model have been released over the years. These updates include new algorithms, enhancements to existing features, bug fixes, and more.
The AERMOD modeling system has a variety of settings and options which can be employed in many ways. This includes options which have been pre-approved for use in regulatory applications and those which are meant for testing or may require additional approval in a regulatory context.
Last month, our tip described how AERMET reads custom meteorological data via its Onsite Pathway. AERMET’s Onsite Pathway gives users full control over how the model will read the data provided by the modeler, but there are some general conventions that must still be followed.
AERMET – the meteorological pre-processor for the AERMOD modeling system – allows users to input their own custom meteorological data via its Onsite Pathway. This produces a highly representative dataset when using observations recorded at the site that will be modeled in AERMOD.
In addition to calculating air concentrations of pollutants, the AERMOD air dispersion model can calculate deposition fluxes from both particulate and gaseous emissions. When these routines are enabled, deposition parameters must be input to the model.
Air dispersion models typically have a variety of source types that can be used to represent sources of emissions. One of the most common source types is the point or stack release. Characterized by a well-defined exhaust point with buoyancy (via a defined exit temperature) and vertical momentum (calculated using the diameter of the release point and exit velocity), the point source is probably the most common source type employed in air dispersion modeling.