|| PHM9010 |
|| ATMOSPHERIC DYNAMICS |
|| 2004/2005 |
|| Professor Geraint Vaughan |
|| Semester 1 |
|| Successful Completion of Year 3 of the MPhys Scheme |
| Course delivery
|| Lecture || 22 lectures |
|Assessment Type||Assessment Length/Details||Proportion|
|Semester Exam||3 Hours End of semester examinations ||100%|
After taking this module students should be able to:
apply geostrophic and hydrostatic balance and solve simple problems using these concepts
derive information from a weather chart
explain the fundamental link between vorticity and vertical motion in the atmosphere
explain the structure of a midlatitude cyclone and the central role played by fronts in such a structure
describe the nature of gravity waves and their role in the atmospheric circulation.
summarise the origin and nature of planetary waves and their role in the atmospheric circulation.
This course considers motion in the atmosphere from a fluid-mechanical perspective, showing how geostrophic and hydrostatic balance leads to simplification of the nonlinear basic equations. Applications are presented in the context of synoptic weather systems and fronts. Vorticity and potential vorticity are introduced as fundamental dynamical properties of the flow. Wave motion in the atmosphere is introduced within a physical framework, with application to gravity waves, tides and planetary waves.
Thermodynamics of air: use of the tephigram.
Instability and convection.
The dynamical equations of atmospheric flow: inclusion of Coriolis acceleration.
Scale analysis: horizontal momentum equations, hydrostatic eqn.
Geostrophic and gradient wind.
The chart as a means of displaying information.
Vorticity, the vorticity equation, potential vorticity.
Applications of the conservation of potential vorticity.
General Circulation in the troposphere.
Overview of wave motion in the atmosphere: restoring forces.
Gravity waves: simple theory, asymptotic equation.
Planetary waves: free modes (Rossby waves), forced modes.
Transport by planetary waves.
** Reference Text
J.R. Holton (1991) An introduction to dynamical meteorology
A. Gordon et al (1998) Dynamical Meteorology, A Basic Course
Arnold ISBN 0-340-59503
This module is at CQFW Level 7