Create a CMAS Account or Login Below: Email: Password: Login Forgot your password? New User Information 

## CMAQ Training
October 08-October 09, 2015 Register Now 

## Support CMAS Help Desk CMAQ v5.0.2 Release Notes CMAQ v5.0 Operational Guidance Document M3User Listserv


## Online Resources

CMAQ at the U.S. EPA . This is the host site for CMAQ at the U.S. EPA Atmospheric Sciences Modeling Division. NOAA CMAQ-WRF Forecast

. Real-time air quality forecasts with CMAQ from the National Weather Service. CMAQ Science Document. Access the original science alrgorithms documentation for CMAQ. CMAQ Peer Review. Access results of the past two CMAQ peer review panels. CMAQ Bibliography. Find references to the science in CMAQ.


## Previous Documentation

submit



## System Requirements

O/S Linux Processor 64-bit x86 Memory >1 Gb RAM Disk Space > 80 Gb

Software VERDI , I/O API ,

netCDF,MPI, IDV, Portland Group Fortran , Intel Fortran



## MCIP version 4.2 Create a CMAS Account or Login 

### Search September 16, 2015 H O M E | A B O U T | C M A S N E W S L E T T E R | C O N TA C T | S I T E M A P |

HOME 

## CMAQ CMAQ is an active open-source development project of the U.S. EPA Atmospheric Science Modeling Division that consists of a suite of programs for conducting air quality model simulations. CMAQ is supported and distributed by the CMAS Center. CMAQ combines current knowledge in atmospheric science and air quality modeling with multi-processor computing techniques in an open-source framework to deliver fast, technically sound estimates of ozone, particulates, toxics, and acid deposition.


## Latest Version: CMAQ version 5.0.2 DOWNLOAD| DOCUMENTATION

FEATURES

Instrumented Models Integrated Source Apportionment Method Direct Decoupled Method Sulfur Tracking Community Contributions Volatility Basis Set (contributed by ENVIRON International, Corp.Two-Way Coupled MeteorologyChemistry Model Two-way Coupled WRF3.4 and CMAQv5.0.2 Chemistry SOA Yield Update Photolysis Data Update Sulfate Inhibition Effect Gas-Phase Chemistry

Aerosols Aerosol Updates

Vertical Advection Vertical Advection Time Step Dry Deposition M3DRY Backward Compatibility HELP DESK DOWNLOAD CENTER CONFERENCES & MEETINGS TRAINING RESEARCH & DEVELOPMENT COMMUNITY RESOURCES CMAS WIKI BENMAP CMAQ C-TOOLS FEST-C R-LINE SMOKE SPATIAL ALLOCATOR VERDI 

### Community Modeling and Analysis (CMAS) - CMAQ https://www.cmascenter.org/cmaq/

1 of 4 9/16/2015 10:16 AMThe meteorology-chemistry interface processor converts MM5 and WRF output to CMAQ and SMOKE-compatible format. Download the MCIP version 4.2 from the CMAS Center to take advantage of the latest updatesto the program. Ammonia Bi-Directional Exchange Bi-Directional Ammonia Deposition Multipollutant Modeling Mercury Bi-Directional Exchange Other Updates and Bug Fixes Meteorology Land Use Windblown Dust ACONC Bug Fix PT3D Bug Fix 

## History of CMAQ The Community Multi-scale Air Quality (CMAQ) modeli ng system has been designed to approach air quality as a whole by including state- of-the-science capabilities for modeling multiple air quality issues, including troposphericozone, fine particles, toxics, acid deposition, and visibility degradation. In this way, the develo pment of CMAQ involves the scientific expertise from each of these areas and combines the capabilit ies to enable a community modeling practice. CMAQ was also designed to have multi-scal e capabilities so that separate models were not needed for urban and regional scale air qu ality modeling. The target grid resolutions and domain sizes for CM AQ range spatially and temporally over several orders of magnitude. With the temporal flex ibility of the model, simulations can be performed to evaluate longer term (annual to multi- year) pollutant climatologies as well as short term (weeks to months) transport from localized sou rces. With the model's ability to handle a large range of spatial scales, CMAQ can be used forurban and regional scale model simulations. By making CMAQ a modeling system that addresses multiple pollutants and different spatial scales, CMAQ has a "one atmosphere" perspective that combines the efforts of the scientific community. Improvements will be madeto the CMAQ modeling system as the scientific community further develops the state-of- the-science. To implement multi-scale capabilities in CMAQ, seve ral issues, such as scalable atmospheric dynamics and generalized coordinates, that depend o n the desired model resolution are addressed. Meteorological models may assume hydrost atic conditions for large regional scales, where the atmosphere is assumed to have a balance o f vertical pressure and gravitational forces with no net vertical acceleration on larger scales. However, on smaller scales such as urban scales, this assumption cannot be made. A setof governing equations for compressible non-hydrostatic atmospheres is available to better resolve atmospheric dynamics at smaller scales. These non-hydrostatic equations are more ap propriate for finer regional scale and urban scale meteorology. Because CMAQ is designed to hand le scale dependent meteorological formulations and a large amount of flexibility, CMAQ's governing equations are expressed in a generalized coordinate system. This approach ensure s consistency between CMAQ and the meteorological modeling system. The generalized coo rdinate system determines the necessary grid and coordinate transformations, and it can acc ommodate various vertical coordinates and map projections. The CMAQ modeling system simulates various chemical and physical processes that are thought to be important for understanding atmospher ic trace gas transformations and distributions. The CMAQ modeling system contains th ree types of modeling components: a meteorological modeling system Exit EPA Disclaimer for the description of atmospheric states and motions, emission models for man-made and natur al emissions that are injected into the atmosphere, and a chemistry-transport modeling syst em for simulation of the chemical transformation and fate. The emissions model and CM AQ science codes are available from the Community Modeling and Analysis System (CMAS) Exit EPA Disclaimer center. The CMAQ modeling system consists of several proces sors and the chemical-transport model: Meteorology-chemistry interface processor (MCIP) Photolysis rate processor (JPROC) Initial conditions processor (ICON) Boundary conditions processor (BCON) CMAQ chemical-transport model (CCTM) The CMAQ system was designed to have a flexible com munity modeling structure based on modular components. The CCTM includes the following major processes:
Horizontal advection Vertical advection Mass conservation adjustments for advection process es 

### Community Modeling and Analysis (CMAS) - CMAQ https://www.cmascenter.org/cmaq/

2 of 4 9/16/2015 10:16 AMHorizontal diffusion Vertical diffusion Emissions injection Deposition Gas-phase chemical reactions Aqueous-phase reactions and cloud mixing Aerosol dynamics, thermodynamics, and chemistry Plume chemistry effects Photolytic rate computation Process analysis The U.S. EPA Atmospheric Model Development Branch ( AMDB ) is developing CMAQ and MCIP for research and regulatory use. AMDB scientis ts develop, test, and refine analytical, statistical, and numerical models used to describe and assess relationships between air pollutant source emissions and resultant air qualit y, deposition, and pollutant exposures to humans and ecosystems. 

## CMAQ Review Process CMAS, in collaboration with EPA scientists, has org anized periodic CMAQ review panel meetings, of 3-day duration each. The review proces s usually starts by inviting a number of key scientists to participate in the process. The scien tists are selected based on their expertise in accordance with the focus of the review session. After reviewing numerous reports and articles and completing their meeting in Research Triangle P ark, North Carolina, the review panel prepares a comprehensive report on their findings a nd recommendations. EPA then responds to the comments of the reviewers. Final review reports are posted below. Fourth Review (September 2011) Final Report: Fourth Peer Review of the CMAQ Model, September, 2011 [ PDF ] Third Review (February 2007) Final Report: Third Peer Review of the CMAQ Model, February, 2007 [ PDF ] Response to the Third Peer Review of the CMAQ Model , April, 2007 [ PDF ] Second Review (May 2005) Final Report: Second Peer Review of the CMAQ Model, July, 2005 [ PDF ] Response to the Second Peer Review of the CMAQ Mode l, August, 2005 [ PDF ] First Review (December, 2003) Presentations (in PDF format): AN EVALUATION OF ETA-CMAQ AIR QUALITY FORECAST MODE L (EDER) CMAQ AEROSOL MODULE (BHAVE) CMAQ MODELING OF ATMOSPHERIC MERCURY (BULLOCK) CMAQ MODELING SYSTEM OVERVIEW (SCHERE) CMAQ OVERVIEW (SCHERE) CMAQ PLUME-IN-GRID MODELING EFFORT (GODOWITCH) CREATING METEOROLOGY FOR CMAQ (OTTE) DIAGNOSTIC AND IN-DEPTH MODEL EVALUATION (DENNIS) EMISSIONS MODELING SUPPORT AND RESEARCH FOR CMAQ (P IERCE) EVALUATION OF 2003 RELEASE OF MODELS-3 CMAQ (EDER) FINAL REPORT FUTURE DEVELOPMENT PLANS FOR CMAQ (SCHERE) GAS-PHASE CHEMISTRY (GIPSON) INVERSE MODELING TO ESTIMATE SEASONAL NH3 EMISSIONS (GILLILAND) LAND SURFACE MODELING AND DRY DEPOSITION (PLEIM) LINKING ETA TO CMAQ FOR AQ FORECASTING (OTTE) LINKING WITH NWS ETA MODEL FOR AIR QUALITY FORECAST ING (SCHERE) MODEL EVALUATION PLANS FOR CMAQ04 (GILLILAND) PREDICTING FATE AND TRANSPORT OF TOXIC AIR POLLUTAN TS (LUECKEN) RECENT DEVELOPMENTS FOR PARALLEL CMAQ (YOUNG) TRANSPORT PROCESSES IN CMAQ (PLEIM) Final Report Summary: December 2003 Peer Review of the CMAQ Model [ PDF] 

### Community Modeling and Analysis (CMAS) - CMAQ https://www.cmascenter.org/cmaq/

3 of 4 9/16/2015 10:16 AM

## Community Modeling and Analysis System (CMAS) General inquiries about the CMAS Center and questio ns about the web site should be directed to cmas@unc.edu

For technical questions about software and data, pl ease refer to our Help Desk

Page Last Modified: 10/24/2014 12:19:20 PM 

### Community Modeling and Analysis (CMAS) - CMAQ https://www.cmascenter.org/cmaq/

4 of 4 9/16/2015 10:16 AM