독도 실시간 해양관측 부이에서 관측된 2009~2014년 동안 독도 주변 해역 수온, 염분의 월 변동성 - 해수 유동의 영향을 중심으로

Abstract

Abstract Data from a moored buoy of the Dokdo Ocean Time-series site (DOT) were analyzed to improve understanding of the monthly variability of temperature and salinity around Dokdo between 2009 and 2014. The buoy was deployed 3.2 km off Dokdo at a depth of 140 m to measure meteorological and oceanographic data in real-time. The variability of temperature and salinity was closely related to current variability, with periods of 25-40 days from the path variability of the East Korean Warm Current, Ulleung Warm Eddy, and East Sea Intermediate Water inflow. The monthly mean temperature in the surface layer reached a minimum in March and maximum in August. The month with the monthly mean temperature maximum in each layer was delayed from August to November as the depth deepened. Subsurface water below a depth of 60 m reached a minimum mainly August because of the inflow of East Sea Intermediate Water. Between July and October, surface water became warmer and fresher with less than 33.5 because of the inflow of Tsushima surface water. The buoy at the DOT, called Dokdo Ocean Buoy, is one of the most useful observation approaches to observe the short and long term fluctuations around the Dokdo considering the frequent sea weather deterioration in the sea around the Dokdo.