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The Role of Models in Air Quality Management Akula Venkatram University of California at Riverside and S.Trivikrama Rao NOAA Atmospheric Sciences Modeling Division. Types of models Applications Case studies Estimating emissions Conclusions. Air Quality Models. Comprehensive Model

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The Role of Models in Air Quality ManagementAkula Venkatram University of California at Riverside andS.Trivikrama RaoNOAA Atmospheric Sciences Modeling Division

  • Types of models
  • Applications
  • Case studies
    • Estimating emissions
  • Conclusions
air quality models
Air Quality Models

Comprehensive Model

Includes all the relevant physical and chemical processes in the atmosphere in as much detail as possible

Semi-empirical Model

Parameterizes major processes and is anchored explicitly to observations

-Receptor Models

applications
Applications
  • Permitting new sources (e.g. ISC, AERMOD)
  • Examining the impact of emission changes
  • Interpolating among measured concentrations
  • Interpreting trends in air quality
  • Estimating emission strengths
  • Forecasting air quality
applications of comprehensive models
Applications of Comprehensive Models
  • Photochemical pollution and Acid Deposition
  • Includes reactions among HCs and NOx and aerosol chemistry in the gas and aqueous phases

Used to examine non-linear response of air quality to emission changes

Have large input and computational requirements

noaa epa air quality forecast modeling system
NOAA-EPA Air Quality Forecast Modeling System

Numerical Weather

Prediction Model

NOAA/NWS

Weather

Observations

EPA’s National

Emissions Inventory:

EPA/OAQPS

AQ Module:

Emissions Preprocessor

NOAA/OAR +EPA/ORD

Air Quality

Observations

AQ Module:

Air Quality Reactive Transport

NOAA/OAR + EPA/ORD

Predicted pollutant concentrations

estimating pm 10 emissions with models
Estimating PM10 Emissions with Models

Dust emissions from paved and unpaved roads are estimated using AP-42 formula, which depends on silt loading-unreliable

Dispersion models can be used to estimate emissions by fitting model estimates to observations

concluding remarks
Concluding Remarks
  • Need models to relate emissions to air quality
  • Cannot interpret ambient data without models
  • Emissions can be estimated using air quality data and dispersion models
  • Models do not have to be complex to be useful
thanks
Thanks
  • P. Goyal, M. Sharan, M. Mohan (IIT, Delhi)
  • Innumerable papers on modeling by M.P. Singh, P. Goyal, M. Sharan, M. Mohan, S. K. Patil and others
  • World Bank Reports
  • BAQ Organizing Committee
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