泉州湾水体结构的潮周期变化  

Intratidal variation of the water column in Quanzhou Bay

作　　者：刘浩[1] 骆智斌[2] 潘伟然[2] 

机构地区：[1]上海海洋大学大洋渔业资源可持续开发省部共建教育部重点实验室大洋生物资源开发与利用上海市高校重点实验室,上海201306 [2]厦门大学海洋与环境学院,福建厦门361005

出　　处：《台湾海峡》2009年第3期316-320,共5页Journal of Oceanography In Taiwan Strait

基　　金：中国科学院海洋环流与波动重点实验室开放研究基金资助项目(KLOCAW0804);中国科学院院长优秀奖获得者科研启动资金资助项目(AJ0809CX-033)

摘　　要：泉州湾6个站点的观测数据显示:内湾涨潮流历时由底层向表层逐渐变短,而落潮流历时则逐渐变长;同时,各个站点实测的盐度水深结构也具有明显的潮周期变化特征,这可能与局地水体的层化和混合机制的交替变化密切相关.进一步定量分析s2站位上影响水体结构变化的四种机制发现:外湾的河口环流作用与潮汐张力、风混合以及潮汐混合作用相比要小一个量级.在一般天气条件下的大潮周期,潮汐混合与潮汐张力相互竞争是导致水体结构交替变化的根本原因;小潮周期由于潮流混合作用减弱,水体层化现象得以持续较长时间,风的搅动在特定时刻可以起到削弱层化结构的作用.Observations at 6 ship moorings show that the flooding duration becomes shorter with water depth from sea floor to surface ,and the ebbing duration shows an opposite case. Meanwhile ,the salinity structure at each station shows an intratidal variation,which is correlated with the alternate competition between stratification and mixing mechanisms. By quantifying 4 mechanisms controlling the vertical configuration of the water column at site 2,it is found that the estuarine circulation is always one order smaller than tidal straining and tidal stirring mechanisms ,because the river discharge is small and exerts a weak influence on the outer bay. Under the normal weather condition,it is the competition between tidal straining and tidal mixing that brings about the alternate appearance of stratification and destratification in the water column during the spring cycle ;whereas during the neap,stratification is able to last for a long time due to the weak tidal mixing ,though strong wind stirring may break the stratification at given time.

关 键 词：物理海洋学 层化和混合 潮汐张力 河口环流 泉州湾 

分 类 号：P733[天文地球—物理海洋学]