Seminar: Marten Blaauw: On the vertical propagation and structure of the equatorial Kelvin waves

Wednesday, 13th January 2016, 13:00
Room F6, 1st floor, FMF, Jadranska 19, Ljubljana

Meteorology Group will host a seminar presented by our colleague Marten Blaauw, who will present his research. The seminar will be in English. Everyone is kindly invited to join.

Abstract:

The Kelvin wave is a gravity wave existing in both the ocean and atmosphere. Its existence depends on the presence of a boundary, such as the equator, that acts as a one-directional waveguide.
In the ocean, equatorial Kelvin waves are mainly found to propagate horizontally, while in the unbounded continuously stratified atmosphere, vertically propagating Kelvin waves are present as well and play an important role in transporting momentum upward and driving the Quasi-Biennial Oscillation in the stratosphere.
Here, the Normal-Mode Function methodology is applied on 6 years of ECMWF operational analyses to diagnose the 3D structure of Kelvin waves. Results show that the vertical structure of Kelvin waves is a transient feature that undergoes seasonal and interannual changes. The variability as well as the average properties of the Kelvin wave in the ECMWF analyses will be presented in the seminar.