CALPUFF

CALPUFF is an advanced, integrated Gaussian puff modeling system for the simulation of atmospheric pollution dispersion distributed by the Atmospheric Studies Group at TRC Solutions. [http://www.cleanairinfo.com/regionalstatelocalmodelingworkshop/documents/CALPUFF.pdf CALPUFF Status and Update] ]

It is maintained by the model developers and distributed by TRC.The model has been adopted by the U.S. Environmental Protection Agency (U.S. EPA) in its "Guideline on Air Quality Models" [ [http://www.epa.gov/scram001/guidance/guide/appw_03.pdf Appendix W] of 40 CFR Part 51] as a preferred model for assessing long range transport of pollutants and their impacts on Federal Class I areas and on a case-by-case basis for certain near-field applications involving complex meteorological conditions.

The integrated modeling system consists of three main components and a set of preprocessing and postprocessing programs. The main components of the modeling system are CALMET (a diagnostic 3-dimensional meteorological model), CALPUFF (an air quality dispersion model), and CALPOST (a postprocessing package). Each of these programs has a graphical user interface (GUI). In addition to these components, there are numerous other processors that may be used to prepare geophysical (land use and terrain) data in many standard formats, meteorological data (surface, upper air, precipitation, and buoy data), and interfaces to other models such as the Penn State/NCAR Mesoscale Model (MM5), the National Centers for Environmental Prediction (NCEP) Eta model and the RAMS meteorological model.

The CALPUFF model is designed to simulate the dispersion of buoyant, puff or continuous point and area pollution sources as well as the dispersion of buoyant, continuous line sources. The model also includes algorithms for handling the effect of downwash by nearby buildings in the path of the pollution plumes. [http://www.ofcm.gov/atd_dir/pdf/calpuff.pdf General and Specific Characteristics of the model] ]

History

The CALPUFF model was originally developed by the Sigma Research Corporation (SRC) in the late 1980s under contract with the California Air Resources Board (CARB) and it was first issued in about 1990. [ [http://www.arb.ca.gov/research/apr/past/a025-2a.pdf Model Formulation and Users Guide for the CALPUFF model, May 1990] ]

The Sigma Research Corporation subsequently became part of Earth Tech, Inc. After the US EPA designated CALPUFF as a preferred model in their "Guideline on Air Quality Models", Earth Tech served as the designated distributor of the model.

In April 2006, ownership of the model switched from Earth Tech to the TRC Environmental Corporation, who are currently (August 2006) responsible for maintaining and distributing the model.

References

ee also

*Atmospheric dispersion modeling
*Atmospheric Studies Group
*Compilation of atmospheric dispersion models

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:

*cite book | author=Turner, D.B. | title=Workbook of atmospheric dispersion estimates: an introduction to dispersion modeling| edition=2nd Edition| publisher=CRC Press | year=1994 | id=ISBN 1-56670-023-X [http://www.crcpress.com/shopping_cart/products/product_detail.asp?sku=L1023&parent_id=&pc= www.crcpress.com]

*cite book | author=Beychok, M.R. | title=Fundamentals Of Stack Gas Dispersion| edition=4th Edition| publisher=self-published | year=2005 | id=ISBN 0-9644588-0-2 [http://www.air-dispersion.com www.air-dispersion.com]

External links

* [http://www.src.com/calpuff/calpuff1.htm ASG at TRC: Official CALPUFF Website]
* [http://www.epa.gov/scram001/dispersion_prefrec.htm The US EPA's Preferred and Recommended Models]
*dmoz|Science/Environment/Air_Quality/Air_Dispersion_Modeling/|Air Dispersion Modeling