Community Multiscale Air Quality Modeling System CMAQ Air Quality Data Summit February 2008.
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Transcript of Community Multiscale Air Quality Modeling System CMAQ Air Quality Data Summit February 2008.
Community Multiscale Air Quality Modeling System
CMAQ
Air Quality Data Summit
February 2008
2
CMAQ System Overview & Data Flow
Chemical Transport Model
GoverningEquations
Gas PhaseChemistry
TransportAerosols
Chemistry
CloudChemistry
Emissions Processing - Data
(SMOKE)
Meteorological Data &Met Models - Data
(MM-5 / WRF)
Met-Chemistry Interface Processor - Data
(MCIP)
Emissions Data &Emis Models - Data
(Mobile / other models)
CONC
DEP
Extraction“End User”
Files
3
CMAQ Data Types and Attributes
• CMAQ Input Data Meteorology: gridded (x,y,z), hourly data for more than 50
parameters Emissions: gridded (x,y,z), hourly data for 30 gas and
particle species
• CMAQ Output Data Concentration: gridded hourly average
CONC file: All species all layers Extraction files: “ground level” O3, NO, NO2, NH3, OH, other
gases, and fine and course particle species
Deposition: gridded, hourly total wet and dry Oxidized and reduced nitrogen species, sulfur, ozone, and
other species
4
CMAQ Data for 2002• Supplier
EPA OAQPS and ORD Data developed as part of 2002 Multi-Pollutant Air Quality
Modeling Platform
• Usage CMAQ Evaluation & Improvement EPA Policy Analyses and Regulatory Applications
• Connections to Other Systems Data currently stored inside EPA “firewall” at NCC Data are “loosely” coupled to:
Visualization (PAVE/VERDI) Model evaluation (AMET) Decision support (BENMap) Other analyses (e.g., Data Fusion, Accountability)
36km DomainLower Left Corner: -2736000, -2088000Col x Row: 148 x 112Lambert Projection: 1st std parallel: 33 2nd std parallel: 45 central meridian: -97 latitude of projection's origin: 40
12km Eastern Domainx,y: -1008000, -1620000Col x Row: 279 x 240
12km Western Domainx,y: -2412000, -972000Col x Row: 213 x 192
Spatial Coverage of 2002 CMAQ DataContinental US Domain: 36 x 36 km x 14 layers
Eastern & Western Domains: 12 x 12 km x 14 layers
6
CMAQ Data Enhancements
• Implementing improved internal data base management procedures
• Possible development of a CMAQ Applications Management Framework with attributes and functionality similar to the Emissions Modeling Framework
• Exploring public access to 2002 data via Community Modeling & Analysis System (CMAS)
7
• What are the specific user needs (internal/external)? How will these be defined?
• What is the most IT-efficient way to provide access to users inside/outside EPA? Data volume issues
Outputs from 12 km Eastern Domain annual run ~ 3,000GB Firewall issues (external users)
• Should EPA provide data for all species in all layers? If so, what procedures will be available to users to subset data in space
and time (leverage existing procedures, e.g., RSIG)?
• How will user questions/access problems be addressed? Questions: Technical issues beyond what metadata can address Access: IT issues
Issues w/re Access to CMAQ Data (1)
8
• CMAQ applications are often “evolutionary” Specific scenarios may be updated as new inputs and science
become available Potential for consistency/comparability issues across different
CMAQ applications So....
Increased emphasis on metadata, version tracking, and other documentation
How will the user community be notified of updates to CMAQ data?
• CMAQ outputs from regulatory / research applications must be kept internal until rules / journal articles are published…..this results in potentially large time-lag between completion of model application and public release of data
Issues w/re Access to CMAQ Data (2)