Observing spectral characteristics over a continental shelf and slope in the South China Sea
doi: 10.1007/s13131-013-0329-x
Observing spectral characteristics over a continental shelf and slope in the South China Sea
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摘要: Using in situmeasurement data fromMay-June, 1998, and data fromthe Asian seas international acoustics experiment (ASIAEX) from2001 in the South China Sea (SCS), the spectral density function and the dissipation spectrum function are estimated. In the infra-gravity wave (IGW) band, the power spectra of velocity (u, v, w) are universal functionswith respect to characteristic frequencies, which correspond to the peak frequencies of the dissipation spectrum (PFDS). This suggests that high-frequency internal waves in the IGW band have similar dynamical characteristics. In addition, the evolution of these characteristic frequencies is explored and its highest value is 8.8 cph (cycles per hour, 1 cph=2.778×10-3 Hz).Abstract: Using in situmeasurement data fromMay-June, 1998, and data fromthe Asian seas international acoustics experiment (ASIAEX) from2001 in the South China Sea (SCS), the spectral density function and the dissipation spectrum function are estimated. In the infra-gravity wave (IGW) band, the power spectra of velocity (u, v, w) are universal functionswith respect to characteristic frequencies, which correspond to the peak frequencies of the dissipation spectrum (PFDS). This suggests that high-frequency internal waves in the IGW band have similar dynamical characteristics. In addition, the evolution of these characteristic frequencies is explored and its highest value is 8.8 cph (cycles per hour, 1 cph=2.778×10-3 Hz).
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Key words:
- dissipation spectra /
- characteristic frequencies /
- South China Sea
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