Overview

Spreadsheet comparing features of AERMOD, HYSPLIT, CALPUFF, & CMAQ. (Draft, Aug 2018)

- Quick overview of turbulence theory, boundary-layers & diffusion theory

(See Stull, 2017, Practical Meteorology (PrMet),

Chapter 18 Atmospheric Boundary Layers &

Chapter 19 Pollutant Dispersion).

The notation below refers to section numbers in those chapters.

- PrMet 19.0 - 19.2. Intro, terminology, air qual standards. Also BC AirQual Stds.

- Discussion: Passive tracers. Role of turbulence vs. molecular diffusion.
- Superposition of eddies. Shear generation. Buoyant generation.

Deeper convection1. Deeper convection2.

- Discussion of spectrum of eddy sizes. Richardson's poem. ScanSet A p3.

- Turbulent timeseries.

- Turbulence statistics BCMoE talk 2017 p39-60 ; & [PrMet 18.6 Turb (but not last page)] .
- Smoke is emitted into Atmos. Boundary Layers (ABL), and ABLs are often turbulent.
- PrMet 18.0-18.5 ABLs .

- PrMet 19.3 stable vs neutral vs unstable ABLs. Pasquill-Gifford.

- Gaussian Plumes
- PrMet 19.4.1. Plume snapshot vs time average.

- From 1-D Gaussian puff (ScanSet B) to 3-D Gaussian plumes (ScanSet C)

(and their relationship to AERMOD and HYSPLIT)

- Taylor's statistical theory (ScanSet D)

- Meaning and widespread use of Lagrangian autocorrelation R

- Sigma-y and sigma-z
- Applications
- Homework: Gaussian plume for neutral PBL.

- Dispersion in Convective Boundary Layers (Deardorff)

- Similarity theory overview from Intro to BL Meteorology chapter 9 (ScanSet E),

and the Handbook of similarity functions

- Movie of Willis & Deardorff convection tank experiments (download first, then play)

- Convective similarity for pollutant dispersion (ScanSet F)

- Interpretation of dimensionless variable "X"
- Stull's fit to Deardorff convective dispersion (PrMet 19.7)
- Homework: Deardorff smoke dispersion in convective PBL

- Plume Rise
- Briggs & Weil plume rise derivations (ScanSet G)

- .
- Lagrangian particle dispersion
- Concept of Advection by the mean wind. Banff movie (download, then play) & COMET demo

- Trajectories vs streamlines vs streaklines

- Eqs. used in Hysplit. (see BAMS paper eqs 2 & 3 and Hysplit arl-224 Tech Memo in the HYSPLIT section of this course)

- Advection equation: (See BAMS paper eq 1). Demo with advection worksheet.

- Turbulent dispersion of particles
- Langevin eq. vs. turbulent dispersion (See BAMS supplement)

- Similarity eqs. for sigma-u,v,w . (& Homework)
- Write your own Lagrangian particle model - 1-D

- Turbulence kinetic energy (TKE)
- Turbulent dispersion of puffs
- XXX
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- .

- XXX

Other Info

*http://www.eos.ubc.ca/courses/atsc507/ADM/
Copyright © 2016, 2018 by Roland Stull.*