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Special Session 6: The ocean’s energy cascade and mixing |
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Observations on internal wave modulations under varying mesoscale conditions in the southwestern East/Japan Sea
Wednesday 11th @ 1440-1500
Multi-function Hall
Suyun Noh* , School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Republic of Korea
SungHyun Nam, School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Republic of Korea
Sang-Shin Byun, Republic of Korea Navy (ROKN)
Kyung-Il Chang, School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Republic of Korea
Presenter Email: synoh0117@gmail.com
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| Long-term mooring, located at 37.33N, 131.45E, captured events of enhanced near-inertial waves (NIW) and continuum frequency waves (CFW) which are associated with mesoscale strain and vorticity fields. Three events observed from July to November in 2003 demonstrate an importance of mesoscale fields on evolution and modification of internal wave field. A comparison between observed NIW and simulated NIW by damped slab model suggests local wind forcing is only partly responsible for NIW amplification. In particular, the enhancement of both the NIW and CFW energies occasionally found at 360m are linked to an anticyclonic eddy near the mooring, intensifying the WKB-scaled kinetic energies and its decaying caused by two cyclonic circulations with an enhanced normal strain. Either high or low chlorophyll concentration detected inside of anticyclonic eddy from satellite ocean color images reflects the significant implications on internal wave-driven mixing and further on physical-biological interactions in regions of strong mesoscale variability. |
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