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Special Session 6: The ocean’s energy cascade and mixing |
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Vertical variability of currents revealed by mooring observation
SS6-03-S
Baolan Wu* , Ocean University of China
Chao Ma, Ocean University of China
Dexing Wu, Ocean University of China
Presenter Email: wubaolanouc@163.com
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| A long-term subsurface mooring was deployed in August, 2010 in the north South China Sea with continuous observation for more than 8 months. The observed currents by ADCPs in the upper 1000m and by a RCM in 3500m were used to study the vertical variability of currents from surface to deep ocean. After removing the tidal components, the residual currents show an interesting vertical structure. It is indicated that: (1) The inertial oscillation is dominant from surface to subsurface ocean. Even in the 3500m depth, the inertial oscillation is still obvious. (2) Oceanic eddies have strong impact on the vertical variability of inertial oscillation. When Anti-cyclonic Eddy passes by, the inertial oscillation could penetrate into deeper ocean. (3) Vertical coherence of the surface and bottom currents is observed and it is related with mesoscale eddy activates. Our results imply that in the South China Sea energy from upper ocean could transfer into the deep ocean and this may be one of the energy source to main the deep ocean current. |
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