Multiple time scales in rainfall variability |
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Authors: | Subramaniam Moten |
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Institution: | (1) Malaysian Meteorological Service, Jalan Sultan, 46667 Petaling Jaya, Selangor, Malaysia |
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Abstract: | Monthly rainfall data averaged over a selected number of stations in peninsular Malaysia with a long record was subjected
to singular spectrum analysis to determine the different modes of fluctuations in the rainfall. The analysis highlights the
presence of fluctuations in the QBO time scale to a very long term time scale of 18–5 years which is possibly linked to lunar
tidal forcing. There is also evidence of the Malaysian rainfall responding to El-Nino Southern Oscillation. An oscillation
with a 7 to 10 year cycle is also evident. The annual cycle as a regular periodic oscillation is well established by the SSA. |
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Keywords: | Singular spectral analysis time scale time series eigenmode eigenvector principal component |
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