Chapter 5

Key Concepts

1. Two Generic Types of PBL

• Stable
• Unstable

2. TKE

• Scale Separation
• Physics of Generation

3. Unstable PBL

• Typical (well-mixed) Profiles (but note near-surface behavior)
• Implications for Parameterization

4. Stable PBL

• Typical Profiles
• Flux-Gradient & Mixing-length Assumptions
• Ekman Layer

5. Surface Layer

• Roughness Length

6. Spin-down

• Qualitative Behavior - Angular Momentum and Vortex Stretching
• Ekman Pumping

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