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 ( sv, Sveriges meteorologiska och hydrologiska institut, abbreviated SMHI) is a Government agency in Sweden and operates under the Ministry of the Environment. SMHI has expertise within the ...
(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 Linköp ...
.
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 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 \operatorname is the linear differential ...
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 a branch of the atmospheric sciences (which include atmospheric chemistry and physics) with a major focus on weather forecasting. The study of meteorology dates back millennia, though significant progress in meteorology did not ...
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 in which the chemistry of the Earth's atmosphere and that of other planets is studied. It is a multidisciplinary approach of research and draws on environmental chemistry, physics, meteoro ...
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 light (400–7 ...
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 pollutant ...
*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 pollutant ...
*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
Man ...
*Swedish Meteorological and Hydrological Institute
The Swedish Meteorological and Hydrological Institute ( sv, Sveriges meteorologiska och hydrologiska institut, abbreviated SMHI) is a Government agency in Sweden and operates under the Ministry of the Environment. SMHI has expertise within the ...
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