Interactions of Tropical Synoptic-Scale Features as Viewed from Satellite
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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Tropical synoptic features - a hypothesized periodic 12 d oscillation over Central America and a 2800 km eastward propagating wave over the eastern Pacific--are examined in OLR and TOVS satellite observations. Their interactions with each other, with tropical plumes and intraseasonal oscillations are found to be weak. Time series analysis of the area-averaged 140 deg -40 deg W and 35 deg N-35 deg S daily OLR for 1984 revealed a persistent 12 d oscillation in convective activity during dry 1 January-9 May and wet 10 May-4 December seasons. A spurious 7 d spike related to the amplitude of OLR values in convective regions, was removed. Composite diagrams of the phases of the oscillation Maximum, Minimum and inflection points revealed a preferred meridional orientation of OLR anomalies with eastward movement in the dry season and westward movement in the wet season.
- Unmanned Spacecraft