Observation and simulation of vertical structure change during typhoon passing in macro-tidal environment

Abstract

The west ocean of Korea (Yellow Sea) is a macro-tidal environment where the maximum tidal range is up to 10 m and its maximum tidal current speed at the flood and ebb tide is about 1.5 to 2.0 m/s. In 2011 during the typhoon Meari (1105) passage, the Korea Institute of Ocean and Technology observed the changes of water column temperature and vertical profile of current from the observation buoy which located nearby Eocheong island in the west coast of Korean Peninsula. The Eocheong observation buoy is equipped with weather sensors capable of observing the wind, temperature and pressure, ADCP capable of observing the current speed every 2m layer, and CTD capable of observing the vertical structure of water temperature and salinity. The current speed and surface temperature were observed at 10-minute intervals, the vertical profile of water temperature and salinity was measured twice a day. Typhoon Meari occurred on June 22, 2011 at the east of the Philippines and quickly passed through the west coast of Korea on June 26. The record of observation station of the south ocean of the Korea showed that the lowest pressure was 990 hpa and the strongest wind speed was 22.3 m/s. Although typhoon Meari passed northward of 150 km west of the Eocheong observation buoy, the typhoon effects were recorded clearly. During the typhoon passing the characteristics of the vertical current structure varied with depth, and the vertical ssage, the Korea Institute of Ocean and Technology observed the changes of water column temperature and vertical profile of current from the observation buoy which located nearby Eocheong island in the west coast of Korean Peninsula. The Eocheong observation buoy is equipped with weather sensors capable of observing the wind, temperature and pressure, ADCP capable of observing the current speed every 2m layer, and CTD capable of observing the vertical structure of water temperature and salinity. The current speed and surface temperature were observed at 10-minute intervals, the vertical profile of water temperature and salinity was measured twice a day. Typhoon Meari occurred on June 22, 2011 at the east of the Philippines and quickly passed through the west coast of Korea on June 26. The record of observation station of the south ocean of the Korea showed that the lowest pressure was 990 hpa and the strongest wind speed was 22.3 m/s. Although typhoon Meari passed northward of 150 km west of the Eocheong observation buoy, the typhoon effects were recorded clearly. During the typhoon passing the characteristics of the vertical current structure varied with depth, and the vertical s