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Abstract
The normal mode method is adopted to decompose the differences between simulations with SST (sea surface temperature) anomahes over centra-eastern Pacific and normal SST by use of a nine-layer global spectral model in order to investigate short-range climatic oscillation with various time scales forced by El Nino during the northern summer.Investigation shows that El Nino may have the following influence on atmosphere on various space-time scales.Extra-long wave components of Rossby mode forced by conve ctiveanomaly over equatorial western Pacific resulting from El Nino produce climatic oscillation on monthly (seasonal) time scale in middle-high latitudes of Southern and Northern Hemispheres;extra-long wave components of Kelvin mode forced by SST anomalies propagate along the equator,resulting in 30-60 day oscillation of tropical and subtropical atmosphere;and its long waves move eastward with westerly,resulting in quasi-biweek oscillation.
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