Spatial and temporal 26-day SST variations in the equatorial Indian Ocean using wavelet analysis

Physics

Scientific paper

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Oceanography: General: Climate And Interannual Variability, Oceanography: General: Descriptive And Regional Oceanography, Oceanography: General: Equatorial Oceanography, Oceanography: General: Diurnal, Seasonal, And Annual Cycles

Scientific paper

Two-year sea-surface temperature time series of satellite data at two sites in the equatorial Indian Ocean are examined for oscillations with periods 2-70 days. The wavelet transform of the signals reveals a changing wavelet spectrum between August 1987 and November 1987 in the 10-30 day range, while the same time period in 1988 shows a relatively fixed spectrum. At 3° latitude and 53° E the 1987 wavelet coefficients with scales 10-30 days have about twice the amplitude they have in 1988. At 3° latitude and 56° E the 1987 waves have roughly half the amplitude as the 1988 waves. Activity with wavelet spectral peaks at periods near 12 days often precede these waves.

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