DISPERSION21 (also called DISPERSION 2.1) is a local scale
atmospheric pollution dispersion model developed by the air quality research unit at
Swedish Meteorological and Hydrological Institute
The Swedish Meteorological and Hydrological Institute (, SMHI) is a Swedish government agency and operates under the Ministry of Climate and Enterprise. SMHI has expertise within the areas of meteorology, hydrology and oceanography, and has exte ...
(SMHI), located in
Norrköping
Norrköping ( , ) is a city in the province of Östergötland in eastern Sweden and the seat of Norrköping Municipality, Östergötland County, about 160 km southwest of the national capital Stockholm, 40 km east of county seat Lin ...
.
The model is widely used in Sweden by local and regional environmental agencies, various industrial users, consultant services offered by SMHI and for educational purposes.
Features and Capabilities
Some of the basic features and capabilities of DISPLAY21 are:
The Model Documententation System (MDS)
of the European Topic Centre on Air and Climate Change (part of the European Environment Agency)
*Source types: Multiple point, area, and volume sources as well as street canyons.
*Source releases: Surface, near surface and elevated sources.
*Source locations: Urban or rural locations.
*Plume types: Continuous or intermittent buoyant plumes
* Plume dispersion treatment: Gaussian model treatment using Green's function
In mathematics, a Green's function (or Green function) is the impulse response of an inhomogeneous linear differential operator defined on a domain with specified initial conditions or boundary conditions.
This means that if L is a linear dif ...
s and includes multiple reflections.
*Terrain types: Simple terrain with no more than 10 degree slopes.
*Building effects: Building downwash algorithms are included.
*Meteorological
Meteorology is the scientific study of the Earth's atmosphere and short-term atmospheric phenomena (i.e. weather), with a focus on weather forecasting. It has applications in the military, aviation, energy production, transport, agriculture ...
data: The model includes a preprocessor to produce the meteorological parameters needed to characterize the atmospheric turbulence as well as to produce wind speed and direction profiles.
* The street canyon module includes some atmospheric chemistry
Atmospheric chemistry is a branch of atmospheric science that studies the chemistry of the Earth's atmosphere and that of other planets. This multidisciplinary approach of research draws on environmental chemistry, physics, meteorology, comput ...
for photochemical
Photochemistry is the branch of chemistry concerned with the chemical effects of light. Generally, this term is used to describe a chemical reaction caused by absorption of ultraviolet (wavelength from 100 to 400 nm), visible (400–750&nb ...
reactions.
See also
*Bibliography of atmospheric dispersion modeling
Atmospheric dispersion modeling is the mathematical simulation of how air pollutants disperse in the ambient atmosphere. It is performed with computer programs that include algorithms to solve the mathematical equations that govern the polluta ...
*Atmospheric dispersion modeling
Atmospheric dispersion modeling is the mathematical simulation of how air pollutants disperse in the ambient atmosphere. It is performed with computer programs that include algorithms to solve the mathematical equations that govern the polluta ...
*List of atmospheric dispersion models
Atmospheric dispersion models are computer programs that use mathematical algorithms to simulate how pollutants in the ambient atmosphere disperse and, in some cases, how they react in the atmosphere.
US Environmental Protection Agency models
Ma ...
*Swedish Meteorological and Hydrological Institute
The Swedish Meteorological and Hydrological Institute (, SMHI) is a Swedish government agency and operates under the Ministry of Climate and Enterprise. SMHI has expertise within the areas of meteorology, hydrology and oceanography, and has exte ...
Further reading
For those who are unfamiliar with air pollution dispersion modelling and would like to learn more about the subject, it is suggested that either one of the following books be read:
www.crcpress.com
www.air-dispersion.com
References
External links
SMHI web site
click on 'Products & Services', then on 'Environment', and then on 'Dispersion'
{{Atmospheric, Oceanographic and Climate Models
Atmospheric dispersion modeling