Session 1, Unit 1 Course Overview

Introduction Course – ENV 7335 Air Quality Modeling Instructor – Yousheng Zeng, Ph.D., P.E. Prerequisite – ENV 7331 or equivalent

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

Course Materials Textbook – “Atmospheric Dispersion Modeling Compliance Guide” with CD-ROM by Schnelle & Dey McGraw Hill, 1999 Other materials available on the Internet ISC3 Program and Manual BPIP Program and Manual Other relevant information

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

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

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

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

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

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

Grading Midterm exam20 points Final exam30 points Modeling exercise10 points Modeling Project40 points Total100 points

Communication Course website: All students should send me a short at so that I can distribute announcement/materials if

Session 1, Unit 2 Basic meteorological principles

Atmosphere Composition Near surface (tropospheric air)  Nitrogen:78.08%  Oxygen:20.95%  Argon:0.9%  Contributors to atmospheric absorptive properties H 2 O:Variable CO 2 :332 ppm CH 4 :1.65 ppm N 2 O:0.33 ppm O 3 : ppm

Atmosphere Vertical temperature profile Troposphere Stratosphere Mesosphere Thermosphere

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

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

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

Geostrophic Layer m height Two forces Horizontal pressure gradient Coriolis force Undisturbed constant air flow – Geostrophic wind

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

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