• Characteristics of low frequency oscillations of the atmosphere-ocean coupling

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    • Keywords


      NCEP (National Center for Environmental Prediction); COADS (Comprehensive Ocean Atmosphere Data Set); LHF (Surface Latent Heat Flux); MJO (Madden Julian Oscillation); FFT (Fast Fourier Transformation)

    • Abstract


      The low frequency oscillation of latent heat flux over the tropical oceans has been studied. The NCEP reanalyzed fields of wind and humidity alongwith Reynolds SST are used to compute the instantaneous as well as monthly mean surface latent heat fluxes (LHF) for the year 1999. The procedure of LHF computation is based on bulk method. Spectral analysis shows that significant energy is contained in Madden Julian Oscillation band in the winds, SST, moisture and in the latent heat flux. The global distribution of wind, humidity, SST and LHF oscillation on the time scale of 30–50 days are analyzed. Maximum amplitude of oscillation on this time scale in all the above mentioned parameters were found over the Indian Ocean. The fluctuation of surface wind speed and moisture controls the latent heat flux on this time scale. The fluctuation of SST on this time scale does not seem to be important over most of the oceans.

    • Author Affiliations


      Randhir Singh1 B Simon1 P C Joshi1

      1. Atmospheric Sciences Division, Meteorology & Oceanography Group, Space Applications Centre (SAC), ISRO, Ahmedabad - 380 015, India
    • Dates

  • Journal of Earth System Science | News

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