0608号台风“桑美”过境前后对长江口外海域环境的影响

发布时间：2017-12-27 06:21

本文关键词：0608号台风“桑美”过境前后对长江口外海域环境的影响　出处：《地球科学》2016年08期 　论文类型：期刊论文

【摘要】：台风是短期改变海洋环境的重要动力因素,会对近岸河口环境产生巨大的影响.基于0608号台风"桑美"过境前后长江口外海域多个站位的调查资料,分析了台风过境前后长江口外海域温度、盐度、浊度等环境要素的变化.结果表明:在台风引起的水体平流输运和垂向混合作用下,长江口外海域的温度、盐度、浊度等结构发生了较大改变.表层水体的温度降低,盐度增大;底层水体温度升高,盐度降低;温跃层厚度增大,层结构强度减弱;东部海域的盐跃层基本消失,温盐跃层对营养盐垂向输运的限制减弱,导致叶绿素a浓度值升高;台湾暖流底层冷水明显向近岸涌升,近岸上升流特征更为显著,同时台湾暖流底层冷水的中心位置向东偏移;水体浊度减小,尤其是近岸水深较浅海域,细颗粒沉积物被强平流作用输运.
[Abstract]:The typhoon is an important factor to short-term changes in the marine environment, will have a huge impact on the coastal and estuarine environment. Based on before and after the 0608 typhoon "Saomai" crossing the Yangtze Estuary in many stations of survey data, analysis of the change of temperature before and after the typhoon in the Yangtze Estuary, salinity, turbidity and other environmental factors. The results show that the flow transport and vertical mixing in the typhoon induced water level change of the temperature in the Yangtze Estuary, salinity and turbidity. The surface water temperature, salinity is increased; the bottom water temperature, salinity decreased; thermocline layer thickness increases, structural strength; the Eastern sea halocline disappeared, thermocline and halocline on nutrient vertical transport restrictions lead to decreased, chlorophyll a concentration increased significantly; the Taiwan warm current in the bottom cold water toward the coastal upwelling, shore up flow characteristics more At the same time, the central location of the cold water at the bottom of the Taiwan warm current shifted eastward, and the turbidity of the water decreased, especially in the shallow coastal area, and the fine sediment was transported by strong advection.
【作者单位】：国土资源部海洋油气资源与环境地质重点实验室;青岛海洋地质研究所;中国科学院海洋研究所;
【基金】：国家自然科学基金重点项目(No.41330964) 科技基础性工作专项项目(No.2013FY112200)
【分类号】：P731;P732.3
【正文快照】： 长江口至浙江海域几乎每年都受台风过境的影响,台风的中心低气压和巨大的风应力会使海洋上下层水体之间发生强烈混合和流辐散,使水体发生剧烈的水平和垂向运动,台风带来的大量降雨,也会导致河口径流量瞬时增大,大量的陆源物质被携带入海,使河口环境发生改变.总之,台风是短期改

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