Previous: Introduction Next:Observed Circulation Up: Ext. Abst.

Goals of this study

Based in the strong impact on the SH tropospheric circulation associated to El Niño (EN) warm events, during the austral spring, and the particular characteristic of the springtime SH circulations with regards to planetary wave dispersion and vertically influencing planetary wave driving into the SH stratosphere, we will, in this study:

1) Describe the observed statistical relationships between El Niño (EN), Pacific warm events, and the SH lower stratosphere anomalous circulation;

2) Use an atmospheric General Circulation Model (aGCM) to simulate the climatological and anomalous (EN, warm events) October features and compare them.

3) Diagnose the simulated-circulations by using EP-fluxes, vorticity analysis and Hovmuller diagrams, in order to characterize and better understand the types of circulation which are established in the upper troposphere and lower stratosphere simulated-atmosphere.