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Air Quality Modeling Course Overview - ENV 7335

This course, led by Dr. Yousheng Zeng, P.E., delves into air quality modeling and atmospheric dispersion. Prerequisites include ENV 7331 or equivalent. Students will explore the fundamentals of air pollution meteorology, perform modeling analyses using the ISC3 regulatory model, and become acquainted with other significant air quality models. Key topics include meteorological principles, air pollution climatology, dispersion modeling, and regulatory requirements. Course materials include a textbook and various online resources. The course emphasizes practical applications and includes a modeling project.

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Air Quality Modeling Course Overview - ENV 7335

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  1. Session 1, Unit 1Course Overview

  2. Introduction • Course – ENV 7335Air Quality Modeling • Instructor – Yousheng Zeng, Ph.D., P.E. • Prerequisite – ENV 7331 or equivalent • www.seas.smu.edu/env/7331

  3. Course Objectives • Understand air pollution meteorology and theory of atmospheric dispersion modeling • Be able to perform an air quality modeling analysis using the most common regulatory model – ISC3 • Understand the regulatory requirements related to air quality modeling analysis • Become knowledgeable of other air quality models

  4. Course Materials • Textbook – “Atmospheric Dispersion Modeling Compliance Guide” with CD-ROMby Schnelle & DeyMcGraw Hill, 1999 • Other materials available on the Internet • ISC3 Program and Manual • BPIP Program and Manual • Other relevant information

  5. Course Outline • Session 1 • Introduction/Course overview • Basic meteorological principles • Session 2 • Air pollution climatology • Turbulence and the mixing process • Session 3 • The dispersion model • Dispersion coefficients

  6. Course Outline • Session 4 • Plume rise • The effect of averaging time, multiple sources, and receptors • Session 5 • Modeling in the presence of dispersion ceilings • SCREEN3, ISCPC, and midterm review • Session 6 • Chimney, building, and terrain effects • Midterm exam

  7. Course Outline • Session 7 • Chimney design • The ISC3 Model • Session 8 • ISC3 practical issues and the BPIP program • Regulatory procedures and PSD modeling • Session 9 • Other important models – ISC-PRIME, AERMOD, CALPUFF, UAM, CAMx • Final review

  8. Course Outline • Session 10 • Modeling accidental releases • Final exam • Modeling exercise due • Modeling project report due

  9. Course Work • Study problems at the end of each chapter in the textbook • Modeling exercise • use the ISCPC model in the textbook CD-ROM • 20 practice problems in Appendix E • Earn credit by turning in answers for 10 of them (even or odd numbers) to demonstrate completion of the exercise • Midterm exam • Final exam

  10. Course Work • Modeling Project • EPA ISCST3 model and BPIP program • Multiple sources • Buildings and terrain • Receptor grid • 1 year met data • Modeling report

  11. Grading

  12. Communication • Course website:www.seas.smu.edu/env/7335 • All students should send me a short email at yz@wisedom.net so that I can distribute announcement/materials if necessary

  13. Session 1, Unit 2Basic meteorological principles

  14. Atmosphere • Composition • Near surface (tropospheric air) • Nitrogen: 78.08% • Oxygen: 20.95% • Argon: 0.9% • Contributors to atmospheric absorptive properties • H2O: Variable • CO2: 332 ppm • CH4: 1.65 ppm • N2O: 0.33 ppm • O3: 0.01-0.1 ppm

  15. Atmosphere • Vertical temperature profile • Troposphere • Stratosphere • Mesosphere • Thermosphere

  16. Energy Balance • Radiation • Occurs when an electron drops to a lower level of energy • Blackbody radiation • Emissivity of a blackbody at 6000 K (the sun) • Emissivity of a blackbody at 300 K (the earth) • Energy balance • Day vs. night • Local energy balance/out of balance • Global energy balance • Greenhouse effect

  17. Scales of Atmospheric Motion • Microscale • Mesoscale • Synoptic (cyclonic scale) • Macroscale

  18. General Circulation • General energy balance controls large scale air movement • Air circulation if the earth did not turn • General circulation • Rotation of the earth – Coriolis force • General circulation pattern

  19. Geostrophic Layer • 500-1000 m height • Two forces • Horizontal pressure gradient • Coriolis force • Undisturbed constant air flow – Geostrophic wind

  20. Planetary Boundary Layer • Surface to 500 m high • Three forces • Horizontal pressure gradient • Coriolis force • Frictional force due to earth’s surface roughness • Different wind from geostrophic wind • Speed – retarded by friction • Direction – altered due to force balance • Urban/mountain vs. smooth surface • Surface layer – from surface to 50 m high

  21. Impact of Fixed Geographic Features • Sea breeze • Valley wind • Drainage wind • Flow patterns due to topographical features

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