Seasonal and Fortnightly Variability of Baroclinic Tides in the Luzon Strait and Northern South China Sea: A Numerical Study
The seasonal and fortnightly variations of baroclinic tides in the Luzon Strait and northern South China Sea are investigated using a three-dimensional tide model driven by four tidal constituents, O1, K1, M2 and S2, separately. Historical CTD data collected at the South East Asia Time-Serious (SEATS) station are used to compute vertical profiles of temperature and salinity in summer and winter, which are used as initial conditions for the present model study. Diurnal and semidiurnal baroclinic tides have a comparable energy flux away from the Luzon Strait. The barotropic to baroclinic conversion rate is about 30% each. Both east and west ridges are active in generating baroclinic tides. There appears no significant seasonal variation of the baroclinic tidal energy flux. Fortnightly variations are strong. Baroclinic tidal energy flux stems from the east ridge in the southern Luzon Strait and that from the west ridge in the northern Luzon Strait combine and form a strong tidal beam immediately west of the west ridge. This semidiurnal baroclinic energy flux is likely the energy source of nonlinear internal waves found in the South China Sea.
AGU Fall Meeting Abstracts
- Pub Date:
- December 2007
- 4255 Numerical modeling (0545;
- 4544 Internal and inertial waves;
- 4560 Surface waves and tides (1222)