26th Conference on Hurricanes and Tropical Meteorology

Wednesday, 5 May 2004
Evidence of cooperative interactions between intraseasonal oscillations and equatorial waves
Richelieu Room (Deauville Beach Resort)
Paul Roundy, CIRES and NOAA/AL, Boulder, CO
Poster PDF (200.0 kB)
The intraseasonal oscillations are known to modulate convection and higher-frequency disturbances that propagate through it. These disturbances are of fundamental importance to the oscillation. The larger ones affect the frequency and amplitude of the large-scale oscillation itself. Three different compositing techniques are implemented here, each indicating how and to what extent westward- moving equatorially trapped Rossby waves modulate the ISO. Each composite is based on an index of the eastward-propagating part of Southern Summer ISO OLR activity. The compositing methods are defended, and the physical interpretation of results given.

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