Frequency-wavenumber spectra of equatorial waves detected from satellite altimeter data |
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| Authors: | Yoshinobu Wakata |
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| Institution: | (1) Research Institute for Applied Mechanics, Kyushu University, Kasuga-kohen, Kasuga-shi, Fukuoka 816-8580, Japan |
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| Abstract: | The sea surface height anomaly in the Pacific equatorial area was separated into equatorial modes using satellite altimeter
data. The power-spectral density (PSD) was obtained for the east-west wavenumber and frequency for each separated mode. The
PSD distribution was compared with the theoretical dispersion curve for the equatorial modes derived by Matsuno (1966). The
first Rossby modes have a high-density distribution that is slightly lower than the theoretical dispersion curve, but the
Kelvin mode and the higher Rossby modes have high-density distribution that almost matches each dispersion curve. Results
of analyses of satellite observational data show that wave motion near the equator mainly shows characteristics of equatorial
waves, especially for a intraseasonal time scale. |
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| Keywords: | Equatorial wave mode separation TOPEX/POSEIDON sea surface height Pacific Ocean |
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