The Taiwan Warm Current Deep Water (or the East China Sea Upper Layer Water

or the East China Sea Subsurface Water) lying in the deep and bottom layers off the coast of Fujian-Zhejiang is one of the main watermasses in the continental shelf region of the western East China Sea. The hydrographical conditions and the fishery productions in this region are affected remarkably by the decline and growth of the Taiwan Warm Current Deep Water. Although the temperature

salinity and origin of the Taiwan Warm Current Deep Water have been investigated[3] by oceanographers the world over

there are up to now few papers published on its characteristics of ariations (seasonal and multiyear variations). Understanding of this problem will be helpful to further characterize this watermass. For this reason

in this paper

section 28°N representing the middle Taiwan Warm Current Deep Water and section 30°N representing the northern Taiwan Warm Current Deep Water are taken for examples

and the method of similar coefficient is used for analysis of this problem.