Variability of the currents in the Luzon Strait during spring of 2002 obtained from observations and satellite geostrophic currents and spectral analyses |
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| Authors: | YaoChu Yuan GuangHong Liao HuiQun Wang RuYun Lou Hong Chen |
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| Institution: | (1) State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou, 310012, China |
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| Abstract: | The structure and variability of the currents in the Luzon Strait during spring of 2002 are studied, based on the current
measurements at the average position of the mooring station (20°49′57″N, 120°48′12″E) from March 17 to April 15, 2002, satellite
geostrophic currents in the Luzon Strait, and the spectral analyses, using the maximum entropy method. The subtidal currents
at the mooring station show decreased amplitudes downward with an anti-cyclonic rotation, suggesting that the currents enter
and exit the South China Sea in the upper and intermediate layers, respectively. The vertical structure of the currents in
the Luzon Strait suggests strongly the sandwiched structure of the LST, even though the bottom part of the profile is not
resolved by the observational grid. The spectral analyses show the following periods of significant spectral peaks: (1) the
tidal currents variability in the vertical direction; (2) the period about 4–6 d for the two cases of frequency f > 0 and f > 0 at the 200 and 500 m levels, but at the 800 m level only for the case of f > 0; (3) The fluctuation in the period range is about 2–3 days for the two cases of f > 0 and f > 0 at the 200, 500 and 800 m levels, namely the Luzon Strait currents exhibit significant synoptical variability throughout
the water column up to 800 m deep. Both direct current measurements and in situ hydrographic and satellite survey suggest
no Kuroshio loop current in the Luzon Strait during the spring of 2002.
Supported by National Basic Research Program of China (Grant No. 2007 CB816003), International Cooperative Project of the
Ministry of Science and Technology of China (Grant No. 2006DFB21630), National Natural Science Foundation of China (Grant
No. 40520140073) and Open Fund of the Key Laboratory of Ocean Circulation and Waves, Chinese Academy of Sciences (Grant No.
KLOCAW0802) |
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| Keywords: | currents in the Luzon Strait tidal currents and synoptical variability satellite geostrophic currents sandwiched structure Kuroshio loop current |
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