This course covers the basic dynamics of the Atmospheric Boundary Layer (ABL) and how it interacts with other environmental and geophysical flows. Topics to be covered include: mean, turbulence, and higher order flow equations, turbulence closure models for the ABL, similarity theories, surface exchanges and their impact on the stability of the atmosphere, the different ABL flow regimes, its role in the hydrologic cycle, the fundamentals of scalar (pollutant, water vapor, etc) transport, modeling and measurement approaches for the ABL, and the role and representation of the ABL in large-scale atmospheric flows and models.