Atmospheric Modeling

Course Overview

  • Course Title: ESST 3001 Environmental Fate and Transport SEM I, 24/25

  • Instructor: C. Manwah

Learning Objectives (Page 2)

  • Description: Outline key components of atmospheric science.

  • List: Identify critical parameters and their roles in atmospheric modeling.

  • Explanation: Discuss processes such as mixing, dispersion, and deposition in the atmosphere.

  • Identification: Characteristic elements of atmospheric models and their necessary parameters.

  • Definitions:

    • Mixing: The process of air and pollutants being evenly distributed.

    • Dispersion: Distribution of pollutants in the atmosphere.

    • Inversion Layer: A layer of air where temperature increases with altitude, trapping pollutants.

    • Turbulence: Irregular atmospheric motion that enhances mixing.

    • Surface Roughness: Variation in land surface that affects airflow.

    • Atmospheric Stability: The tendency of air to rise or remain stable.

Outline of Atmospheric Removal Mechanisms (Page 2)

  • Chemical Reactions: Transforming pollutants into less harmful entities.

  • Deposition: The settling of pollutants out of the atmosphere.

Additional Learning Objectives (Page 3)

  • Explanation: Discuss the influence of various factors on modeling results.

  • Use of Tools: Utilize spreadsheet programs for executing models and evaluating results.

  • Continuous vs. Pulse Input: Understanding how inputs affect modeling results.

Schedule Overview (Page 4)

  • Timeframe: Detailed schedule of courses and tutorials.

  • Course Code: ESST 3001 across various rooms.

Research Project Overview (Page 7)

  • Group Size: 5 students per group.

  • Report Requirement: 10-15 pages excluding references, due November 25, 2024.

  • Word Count: 3500-4500 words, 1.5 spacing, Chicago style referencing.

  • Project Focus: Investigate a specific atmospheric dynamics event.

  • Aspects to Examine:

    1. Conditions leading to the event.

    2. Atmospheric principles explaining pollutant spread.

    3. Early-response actions.

    4. Responses from industry, residents, and environmentalists.

    5. Long-term solutions to prevent recurrence.

Atmospheric Characteristics (Page 8-10)

  • Atmospheric Complexity: Properties constantly changing with time/place.

  • Key Differences: Atmospheric models allow for 3D mixing of air and pollutants.

  • Concepts of Fate and Transport:

    • Fate: What happens to contaminants in the environment.

    • Transport: Movement of substances in different environmental media.

    • Health Threats: Contaminants pose risks to health, necessitating tracking of their fate and transport.

Factors of Concern (Page 11-12)

  • Contaminant Properties: Physical, chemical, and biological properties that affect fate and transport.

  • Site-Specific Factors: Unique conditions at the pollution source.

  • Geologic Conditions: Influence of geological features on pollutant behavior.

Sink Capacity and Indicators (Page 13-16)

  • Environmental Capacity: Limited capacity of the environment to absorb emissions.

  • Air Pollution Models: Tools to assess human exposure and predict future pollution levels.

    • Purpose: Determine effects on air quality and health risk.

Types of Models (Page 19-20)

  • Dispersion Models: Describe how pollutants spread through the atmosphere.

  • Receptor Models: Focus on measuring pollution at specific locations.

  • Stochastic Models: Statistical approaches in understanding pollution patterns.

  • Box Models: Simplified representations of pollutant dynamics in certain areas.

Contaminant Definitions (Page 21-22)

  • Contaminant: Any substance that may or may not be harmful.

  • Pollution: Actual harm caused by contaminants in the environment.

Sources of Air Pollutants (Page 23-24)

  • Natural Sources: Volcanic ash, forest fires affecting local and regional air quality.

  • Human-Induced: Industrial emissions from power plants and vehicles.

  • Types of Pollutants:

  • Primary Pollutants: Emitted directly (e.g., NO, SO2).

  • Secondary Pollutants: Formed through chemical reactions (e.g., O3).

Air Pollution Types and Effects (Page 25-26)

  • Pollution Types:

    • Local: Impacted areas within 1 km of sources.

    • Urban Smog: Larger extent pollutants affecting cities and regions.

    • Continental and Global Effects: Influence on weather patterns, climate change.

  • Health Standards: U.S. National Ambient Air Quality Standards outlining pollutant levels for safety.

Meteorological Factors Influencing Air Pollution (Page 27-28)

  • Meteorological Aspects: Wind speed/direction, stability, topography affecting transport.

Stability and Inversion Phenomena (Pages 36-40)

  • Atmospheric Stability: Determines vertical air movements.

  • Inversion Effects: Traps pollutants near the ground, exacerbating air quality issues.

Atmospheric Dynamics Mechanism (Pages 41-44)

  • Stability conditions impact dispersion of pollutants, varying from stable to unstable.

  • Lift from Thermal Convection: Turbulent eddies from heating increase mixing.

Summary of Air Quality Measures (Pages 54-56)

  • Factors affecting dispersion: wind speed, turbulence, and topography.

  • Surface roughness impacts turbulent flow and pollutant concentrations.

Gaussian Plume Model (Pages 138-141)

  • Model Definition: Used to predict pollutant concentrations based on emissions from point sources.

  • Key Parameters: Emission rate, wind velocity, and dispersion coefficients.

Dispersion and Transport Principles (Pages 107-109)

  • Dispersion Mechanisms: Mixing with surrounding air and dilution.

  • Transport Dynamics: Environmental influences shape dispersion patterns.

Conclusion and References (Pages 171)

  • Comprehensive evaluation of pollutant dynamics through various atmospheric models.

  • Key References:

    • Dunnivant, Frank M. and Elliot Anders. 2006. A basic introduction to pollutant fate and transport.

    • Turner, D. Bruce. 2000. Workbook of Atmospheric Dispersion Estimates.