长江口外赤潮频发海区水文分布特征分析  

Hydrologic distribution characteristics of HAB frequent occurrence area in the outer Changjiant River estuary

作　　者：朱德弟[1] 潘玉球[1] 许卫忆[1] 陈巧云[2] 

机构地区：[1]国家海洋局第二海洋研究所-海洋动力过程和卫星海洋学重点实验室,杭州310012 [2]浙江省农业科学院,杭州310012

出　　处：《应用生态学报》2003年第7期1131-1134,共4页Chinese Journal of Applied Ecology

基　　金：国家重点基础研究发展规划项目 ( 2 0 0 1CB40 970 5 );国家科技部"十五"攻关资助项目 ( 2 0 0 1BA60 3B-0 6- 0 2-1) .

摘　　要：对长江口外赤潮频发区的水文特征的分析表明 ,在这个海区 ,春、夏季由于长江入海径流量大 ,长江冲淡水在西南 东北向流的作用下发生转向 ;上升流一般发生在从第一个转向点到长江口外深槽顶端的西侧斜坡上 ;春季这个转向点偏北 ,夏季偏南 ,秋季因长江入海径流量小 ,似无转向点存在 .春、夏季余流的分布特点是羽状锋区附近是表、底层流辐合区 ;涌升区的表层余流呈现辐散的特征 ,底层余流具有顺槽进入长江口或向长江口辐合的特征 .Based on survey data, this paper analysed the hydrologic characteristics of HAB frequent occurrence area in the outer Changjiang River estuary.The results showed that this area is an area in which the plume front with a salinity of 17～30 in the outer Changjang River estuary,the divergent surface current of the plume front and the upwelling of the high salinity Taiwan bottom warm current are coexisted.In Spring and Summer, the diluted Changjiang River water of this area changed its flow direction under the effect of southwest-northeastward current,possibly due to the large runoff from the Changjiang River to the sea.The upwelling usually occurred at the west side slope between the first turning point and the deep slot top of the outer Changjiang River esturary. This turning point was on the north side in Spring and on the south side in Summer, but in Autumn, no turning point was existed, possibly due to the small runoff. The distribution characteristics of residual current in Spring and Summer was that the adjacent area of plume front was the convergent area of surface and bottom currents,the surface residual current in the upwelling area was at divergent,and the bottom residual current had the characteristics of converging toward the Changjiang River estuary along the deep slot.

关 键 词：长江口外 赤潮 羽状锋 长江冲淡水转向 上升流 

分 类 号：X55[环境科学与工程—环境工程] X731.2