北海道における対馬暖流の長期変動がコンブ生産量に及ぼす影響

抄録

Numerical simulation was performed on the relation between the interannual variation of the Tsushima warm current along the southwest coast of Hokkaido and the concentration of nitrogen, the production of a kelp Laminaria religiosa. The downward tendency of northward volume transport along the southwest coast was maintained at a rate of year 0.036SV in 1986 and afterwards. Reduction of northward flux falls the surface water temperature of the coast, and making nitrate concentration increase was suggested. According to simulation, the year yields of the kelp in the southwest coast increased about 32 times, when northward flux decreased to 60% of the present condition.