• Multiple time scales in rainfall variability

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    • Keywords


      Singular spectral analysis; time scale; time series; eigenmode; eigenvector; principal component

    • 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.

    • Author Affiliations


      Subramaniam Moten1

      1. Malaysian Meteorological Service, Jalan Sultan, Petaling Jaya, Selangor - 46667, Malaysia
    • Dates

  • Journal of Earth System Science | News

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      Posted on July 25, 2019

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