Observation and Analysis of Turbulent Fluxes Observed at Ieodo Ocean Research Station in Autumn 2014

Abstract This study investigates the characteristics of turbulent fluxes observed at IeodoOcean Research Station (IORS) in autumn 2014. The 10 Hz IORS data is quality controlledand calculated to be the 30 minutes turbulent fluxes. The quality control consists of five steps:a weather check, Vickers and Mahrt (VM) sequential check, VM parallel check, flag check,and direction check. Since the IORS is an open-sea station with no orographic influence, thereare no significant diurnal variations for the turbulent fluxes and 10 m wind speed. According tostabilities, the unstable and semi-unstable states appear more than 28% and 70% in autumn,respectively and they have strong winds of over 10 m s −1 . In addition, the turbulent fluxesincrease with increasing wind speed. In particular, the latent heat flux and its deviations areclearly shown because the latent heat flux is influenced by the change of both the sea surfaceroughness and wave height induced by the wind. To demonstrate the changes of the turbulentfluxes before and after typhoon, Vongpong (1419), which is the most intense typhoon affectingthe Korean Peninsula in 2014, is considered. The turbulent flux fluctuates in accordance withthe location of Vongpong. The turbulent fluxes have a large (small) variation when Vongpongapproaches (retreats) at the IORS. The overall results represent that the IORS data helps usunderstand physical processes related to air-sea interaction by providing the valuable and reli-able observed data. Key words: Ieodo Ocean Research Station, Ieodo, turbulent fluxes, typhoon, Vongpong (1419)