夏季西南黄海环流三维结构及其影响机制

发布时间：2018-02-23 21:21

  本文关键词： 西南黄海 三维结构 冷水团 涡动能 动能通量谱　出处：《中国科学院研究生院(海洋研究所)》2016年硕士论文　论文类型：学位论文

【摘要】：西南黄海靠近我国大陆,沿岸具有丰富的渔场和生物资源,但是从2007年开始的浒苔事件为我们敲响了警钟。研究该海域的水文结构和环流形态对于生态灾害预警和海洋渔业活动具有指导意义。本文利用ROMS模式输出的水温、流速数据,首先探究了夏季西南黄海环流的三维结构,结果表明：江苏外海的北向流受沿岸风影响很大而且该流动的流幅和流量整体呈现随着纬度增加而减小的趋势；经向流场具有为在六至八月海洋表层部分全部为浅而薄的北向流,九月几乎整层深度均为南向流的垂向分布特征；北向流流核流向在春夏季向北、秋冬季向南,南向流流核几乎全年向南流动。其次对西南黄海环流的影响因素进行了讨论,分析了南黄海冷水团的生消过程,以及南黄海涡动场的季节性变化规律,并通过计算动能通量谱探讨了相关的变化机理。得出以下主要结论：南黄海冷水团是一个季节性水团,春季开始出现,夏季达到鼎盛状态,秋季开始减弱,到冬季完全消失；位于南黄海东侧的冷水团相对比较稳定,存在的深度较深,而南黄海西侧的冷水团存在时间较短,存在位置也较浅；夏季黄海冷水团环流左支对江苏外海处北向流的强度和结构有着非常重要的影响。南黄海涡动能在季节变化尺度上存在双峰结构,九月和一月各存在一个峰值,九月峰值较大,一月峰值较小；而且,上半年南黄海存在的涡主要为经向伸长,下半年主要为纬向伸长；动能通量谱的计算结果显示,九月存在的涡动能峰值主要是斜压不稳定过程直接作用的结果,而一月的峰值主要与涡涡相互作用相关。
[Abstract]:Southwest Huang Hai is close to the mainland of China, and there are abundant fishing grounds and biological resources along the coast. However, the events of Enteromorpha enteromorpha since 2007 have sounded the alarm bell for us. The study of hydrological structure and circulation pattern in this area is of guiding significance for ecological disaster warning and marine fishery activities. In this paper, we use the water temperature and velocity data output from ROMS model. Firstly, the three-dimensional structure of the southwestern Huang Hai circulation in summer is studied. The results show that the northward current in the offshore of Jiangsu is greatly affected by the coastal wind, and the flow amplitude and discharge decrease with the increase of latitude. The meridional current field is a shallow and thin northward current in the ocean surface from June to August, and almost the depth of the whole layer in September is the vertical distribution of the southward current, the northward flow core flows northward in spring and summer, and south in autumn and winter. The southward flow nuclei flow southward almost all year round. Secondly, the factors affecting the circulation of southwestern Huang Hai are discussed, and the process of occurrence and extinction of the South Huang Hai cold water mass and the seasonal variation law of the southern Huang Hai vortex field are analyzed. The main conclusions are as follows: the Southern Huang Hai cold water mass is a seasonal water mass, which begins to appear in spring, reaches its peak in summer, weakens in autumn and disappears completely in winter. The cold water mass located on the east side of South Huang Hai is relatively stable and deep, while the cold water mass on the west side of South Huang Hai is relatively short in time and shallow in location. In summer, the left branch of Huang Hai cold water mass circulation has a very important influence on the intensity and structure of the northward current off the coast of Jiangsu Province. The kinetic energy of the southern Huang Hai vortex has a bimodal structure on the scale of seasonal variation, one peak in September and one in January, and the peak value in September is larger. In January, the peak value was small, and the vortex in South Huang Hai was mainly meridional elongation in the first half of the year and latitudinal elongation in the second half of the year, and the kinetic energy flux spectrum was calculated. The peak of vorticity kinetic energy in September is mainly the result of direct interaction in baroclinic instability process, while the peak value in January is mainly related to vortex-interaction.
【学位授予单位】：中国科学院研究生院(海洋研究所)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P731.27
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本文编号：1527664