# PHYC/OCEA 4411/5411 - Atmospheric Dynamics I

Atmospheric Dynamics describes the fluid motions of the atmosphere in terms of fundamental physical laws using the language of mathematics. Part I deals mostly with establishing basic principles and deriving the governing equations, whereas Part II focuses on applications, including weather.

## Final Exam

**Friday, Dec 11, 12 - 3 PM @ Dalplex**

The final exam will cover all of the material from the first class up to the end of the lecture on "Rotation in Thunderstorms". No calculators or other electronic devices are permitted.

## Class Evaluations

Class evaluations are to be completed online before midnight on 8 December 2009. You should have received an email from the Department about this. If not, please let me know as soon as possible.

## Downloads

## Class Log

- The conservation laws of physics: mass, momentum, and energy
- Hydrostatic equilibrium; Thickness
- Adiabatic lapse rate; Static stability
- Inertial and non-inertial coordinate systems
- Fictitious force examples
- Body forces; Coordinate systems
- Test I
- Discussed Test problem 3; Coordinate systems (continued)
- Coordinate system transformations; Position, velocity and acceleration in spherical coordinates
- Geophysical conventions
- Total differentiation; The Navier-Stokes equations of motion
- Midterm Exam
- Scale analysis and characteristic numbers
- The geopotential and height; Scale analysis of the component equations
- Scale analysis of the component equations (continued); Horizontal equation of motion; Isobaric coordinates
- Balanced flow
- Heat conservation equation; Mass conservation equation; Summary list of governing equations
- Test II
- The thermal wind; Streamlines and trajectories
- The Eckman layer; Divergence and curl
- Eckman pumping; The vorticity equation
- The vorticity equation (continued); Relationship to magnetostatics; Rotation in thunderstorms
- Preferred rotation in thunderstorms

## Interesting Links

- XCKD 123 -- "Centrifugal Force"
- Tama gravity wave video
- Hurricane Katrina -- GOES satellite imagery
- Clockwise-rotating vortex -- more GOES imagery
- Coriolis force "demonstration" -- it's a clever fake; don't be fooled!