张慧,堵盘军,郑晓琴
( 国家海洋局东海预报中心 上海 200081)
浙闽海域余流特征分析
张慧,堵盘军,郑晓琴
( 国家海洋局东海预报中心 上海 200081)
根据 2006年8月—2007年12月期间在浙闽海域进行的连续观测长达40天的逐季海流资料,深入分析该海域余流的分布特征及季节变化规律,为浙闽海域的物质输运做出铺垫。研究结果表明:浙闽海域南侧(以28°N为界)余流值大于北侧。近岸区域余流受长江冲淡水、浙闽沿岸流控制,余流分布季节特征明显;外海余流受台湾暖流控制,余流流向终年指向E-NE。
浙闽海域;余流;长江冲淡水;台湾暖流;浙闽沿岸流
Abstract: The characteristics and seasonal variations of residual current of Zhejiang-Fujian water were systematically analyzed in this paper based on the surveys of four seasons from August 2006 to December 2007, which can build foundation for long-term mass transportation along Zhejiang-Fujian water.The results show that the residual current of south Zhejiang-Fujian sea is stronger than that of north Zhejiang-Fujian sea.The seasonal variations of residual current along the coast are obviously dominated by the Yangtze diluted water and the Zhejiang-Fujian coastal current; however, the directions of residual current far off the coast point to the north-northeast all the year, which is influenced by Taiwan warm current.
Keywords: Zhejiang –Fujian water; residual current; Yangtze diluted waters; Taiwan warm currents; coastal current of Zhejiang and Fujian
余流指从实测海流中剔除周期性流(如潮流)以后的水体流动,即由潮流调和分析所得的非周期性常流部分。它可以沿某一方向作长距离运动,直接指示着水体的运移和交换情况, 对海水中悬浮物质和可溶性物质的输运、稀释及扩散等都起十分重要的作用。
浙闽海域北倚杭州湾、南临台湾岛,西接浙闽沿岸,东至东海大陆架边缘,海域流系复杂多变,北有苏北沿岸水和黄海冷水团南伸,同时长江、钱塘江两大江河的淡水注入,南有台湾暖流北进,东有黑潮暖流通过,沿海有浙闽沿岸流分布[1],并且存在独特的上升流(图1,图2)。其物理海洋问题一直受到国内乃至国际海洋科学界的关注,科学研究及学术价值重大。
浙闽海域具有极其丰富的海洋资源,它是我国最大的近海渔场—舟山渔场的所在海域;同时,浙闽沿海岸线曲折,港湾众多,分布着象山港、三门湾、乐清湾等重点水产养殖基地,具有重要经济价值。……