대만난류가 남해안에 미치는 계절적 영향

Abstract

To understand the effect of Tsushima Current Warm Water (TCWW) in the study area, we investigated physical parameters, nutrients, and chlorophyll-a in two stations, the coastal area(station R) and the continental shelf area(station M) from March 2006 to November 2010. TCWW was dominant water mass at station M in winter and spring, and at R station in winter. Other seasons were affected by coastal waters and mixed water with the coastal and open sea. But they might be influenced by different coastal waters; station R by the nutrient enriched water in Nakdong River of Korea and station M by the nutrient depleted water in Changjiang Diluted Water from China. Nutrients showed obvious seasonal variation with high values in winter at both stations, and low values in summer at station M and in spring at station R. High chl-a concentration in the mixing periods was triggered by the enhanced stability of water mass rather than the increasing temperature because the warm current of TCWW is always flowing in the study area. The temperature front existed between M and R station, which approaches closer to the coastal area in summer. It may interrupt the diffusion of coastal water, and the strong vertical thermocline also made the water mass of station R stable. The phenomena may play an important role for accumulation of phytoplankton biomass in R station during summer. Therefore the seasonal dist