CALPUFF (CALPUFF)

Purpose

The CALPUFF model simulates the effects of time and space-varying meteorological conditions on pollution transport, transformation and removal.

Description

CALPUFF is an advanced non-steady-state meteorological and air quality modeling system. The model has been adopted by the U.S. Environmental Protection Agency (U.S. EPA) in its Guideline on Air Quality Models as the 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 modeling system consists of three main components and a set of preprocessing and post processing 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 post processing package). Each of these programs has a graphical user interface (GUI).

CALPUFF is a multi-layer, multi-species non-steady-state puff dispersion model that simulates the effects of time- and space-varying meteorological conditions on pollution transport, transformation and removal. CALPUFF can be applied on scales of tens to hundreds of kilometers. It includes algorithms for subgrid scale effects (such as terrain impingement), as well as, longer range effects (such as pollutant removal due to wet scavenging and dry deposition, chemical transformation, and visibility effects of particulate matter concentrations).

CALPUFF is an advanced non-steady-state meteorological and air quality modeling system developed by Exponent scientists. It is maintained by the model developers and distributed by Exponent. The model has been adopted by the U.S. Environmental Protection Agency (USEPA) in its Guideline on Air Quality Models as the 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 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/NAM and RUC models, the Weather Research and Forecasting (WRF) model and the RAMS model.

Regulatory Status

Some examples of applications for which CALPUFF may be suitable include:

  • Near-field impacts in complex flow or dispersion situations
    • complex terrain
    • stagnation, inversion, recirculation, and fumigation conditions
    • overwater transport and coastal conditions
    • light wind speed and calm wind conditions
  • Long range transport
  • Visibility assessments and Class I area impact studies
  • Criteria pollutant modeling, including application to State Implementation Plan (SIP) development
  • Secondary pollutant formation and particulate matter modeling
  • Buoyant area and line sources (e.g., forest fires and aluminum reduction facilities)

Latest Version Version 5.8.5 December 2015
State of Development Released and updated

Development Contact

Al Klausmann
aklaus@src.com
+1 978 970-5600
Atmospheric Studies Group, Earth Tech
TRC Environmental Corp.
650 Suffolk Street
Lowell, MA 01854

Scope

Outcome Areas Environmental
Management Domains Air Quality
Subdomains Air Quality Modelling
Spatial Resolutions Unknown
Spatial Extents Land or Business Unit, Local (i.e. Catchment or District)
Spatial Dimensions 3D
Temporal Resolutions Hours, Days, Months
Temporal Extents Hours, Days, Months
Steady State or Dynamic Unknown
Level of Integration Environmental

Input & Output Data

Key Input Data Meterological
Input Data Formats ASCI
Key Output Data Runoff Fluxes of contaminants
Output Data Formats ASCI, Image File(s)

Accessibility

Open/Closed Source Closed Source
Licence Type Need to Register to download - but free to use.

User Information

Operating Systems Dos executable
User Interface Graphical desktop
Ease of Use Difficult Requires preparation of multiple data files and linking with supporting models
Use in Policy Process Plan (Policy Formulation), Do (Policy Implementation), Review (Issue Identification)
Documentation

Download Page for CALPUFF Modelling System (button available to skip Registration)

A User's Guide for the CALPUFF Dispersion Model http://www.src.com/calpuff/download/CALPUFF_UsersGuide.pdf

Frequently Asked Questions http://www.src.com/calpuff/FAQ-questions.htm

Technical Considerations

Programming Language Fortran
Analytical Techniques Input/output
Model Structure

CALPUFF

Overview of the program elements in the CALMET/CALPUFF Modelling System

Keywords atmosphere, air quality, pollution, meteorology
Linkages to other Models
Links

MFE - Good Practice Guide to Dispersion Modelling

Official CALPUFF Modelling System - Website

USEPA Support Center for Regulatory Atmospheric Modeling (SCRAM) - Air Quality Dispersion Modeling - Preferred and Recommended Models

CALPUFF - Wikipedia Page

You Tube Videos on CALPUFF:

CALPUFF and Odours Training Course 2013 - https://www.youtube.com/watch?v=C6xbdi5oDCw&list=PLf9jTKwtsTNmyGY51LhbmjnFIZzE51fi8

Air Pollution Modelling - https://www.youtube.com/watch?v=kdcMy_3d_co

Key References

Heydenrych, C., et.al. (2005): CALPUFF Model Validation in New Zealand  - Methodology and Issues. Kingett Mitchell Limited. Prepared for Foundation for Science and Technology.

Bennett, M.J, M.E. Yansura, I.G. Hornyik, J.M. Nall, D.G. Caniparoli and C.G. Ashmore, 2002. Evaluation of the CALPUFF Long-range Transport Screening Technique by Comparison to Refined CALPUFF Results for Several Power Plants in Both the Eastern and Western United States. Proceedings of the Air & Waste Management Association's 95th Annual Conference, June 23-27, 2002; Baltimore, MD. Paper #43454.

Levy, JI; Spengler, JD; Hlinka, D; Sullivan, D; Moon, D (2002): Using CALPUFF to evaluate the impacts of power plant emissions in Illinois: mode sensitivity and implications. Atmos. Environ. Vol 36(6):1063-1075. 3) Zhou, Y; Levy, JI; Hammitt, JK; Evans, JS (2003): Estimating population exposure to power plant emissions using CALPUFF: a case study in Beijing, China. Atmos. Environ. Vol. 37(6):815-826

Associated Case Studies

CALPUFF - Sulphur dioxide ambient modelling

The first modelling study was carried out a the Kinleith Pulp and Piaper Mill in 2003 and used a dispersion model known as ISC-PRIME.

 

Other Key Case Studies

Lucas, V 2010 Modelling wintertime concentrations of PM10 in ambient air, Christchurch and Timaru. Environment Canterbury report no. R10/153

The model evaluated against measured and then  used  to model the spatial variation and inter-annual variability of PM10 over five winters

Also used extensively to model the potential effects of air   discharges and to audit consent applications. 

 

Nelson_Richmond Air Quality (2012): Development of an Air Quality Model and Meterological Data Sets for Nelson-Richmond Urban Areas. Golder and Associates Report No 0978104449.