Observing spectral characteristics over a continental shelf and slope in the South China Sea

• 作 者: SHANG Xiaodong XU Chi CHEN Guiying WU Lixin
• 机 构: State Key Laboratory of Tropical Oceanography,South China Sea Institute of Oceanology,Chinese Academ
• 出 处: Acta Oceanologica Sinica
• 发表日期: 2013年07期
• 关键词: dissipation spectra characteristic frequencies South China Sea

Using in situ measurement data from May-June,1998,and data from the Asian seas international acoustics experiment(ASIAEX) from 2001 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 functions with 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).

Using in situ measurement data from May-June, 1998, and data from the Asian seas international acoustics experiment (ASIAEX) from 2001 in the South China Sea (SCS), the spectral density function and the dissipation spectrum function are estimated.In the infra The gravity spectra (IGW) band, the power spectra of velocity [u, v, w) are universal functions with 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).