浙江沿海水域温、盐度的年际变化和渔况变动的关系

本文使用 1960—1989 年期间浙江沿海各海洋站的海表温度、盐度、海洋水文断面观测以及长江径流量资料,据相关和谱分析方法分析了浙江沿海水域温、盐度和长江径流量的年际变化,其相互之间以及与渔况的关系。指出浙江沿海水域温、盐度、长江径流量和渔况均明显存在2.5年的周期变化。在2.5 年变化周期上,这些要素变化关系密切,部分地与El Nino/La Nina 事件相联系。每当浙江沿海水域海表温、盐度和长江径流量发生持续的异常,渔况必发生变化。可据温、盐度、长江径流量的长周期变化预测渔况的长周期变化。

INTERANNUAL VARIATION OF TEMPERATURE AND SALINITY IN RELATING TO FISHERY CONDITION OF THE ZHEJIANG OFFSHORE WATERS

Based on the hydrographic and commercial catch data during1960--1989 in the Zhejiang offshore waters, some feature of interannual variationof the sea surface temperature and salinity, and fishery condition were discussed.The results of spectal analysis show that the variation of the SST, the SSS, therunoff of Changjiang River and fishery condition in this waters have 2. 5 yearsvariational period. There are close correlations in the SST and SSS betweenmarine observation stations and fishery condition at this period and associatepartly with El Nino events. In the period of an El Nino, anomaly change of thesea surface temperature, salinity, runoff of Changjiang River, the fishery conditionwould be occured. The long-term changing tendency of the SST, the SSS and therunoff of Changjiang River can be served to predict the change of fishery condition.