热带东印度洋水文和环流特征及年际变化分析

发布时间：2018-01-27 14:10

本文关键词： 热带东印度洋环流季风 Wyrtki流赤道潜流　出处：《中国海洋大学》2014年硕士论文　论文类型：学位论文

【摘要】：本论文首先介绍了热带东印度洋的背景特征，接着简要的介绍了HYCOM模式并在热带东印度洋建立了模式进行数值模拟，利用模拟资料和实测资料分析热带东印度洋的水文环流特征及其季节性变化。模式结果较好的反映了热带东印度洋的温、盐、流的特征，并且较好的再现了季风影响下以及季风转换时期热带东印度洋水文和环流上特有的特征。首先利用2013年4月国家基金委东印度洋海洋学综合科学考察航次的观测数据，分析了热带东印度洋的水文及环流特征并用观测数据对建立的HYCOM模型数据进行了验证。结果表明研究区域均具有较高的温度且东高西低；赤道Wyrtki流和赤道潜流（EUC）携带着大量的阿拉伯海高盐水向东运输，Wyrtki和EUC均具有较大的流速，在81°E断面上流量分别为4.76SV和12.18SV；观测中还发现了南赤道逆流，核心在5°S附近，流速较大，流量为7.4SV；对比HYCOM模拟结果证明建立的HYCOM能良好的反应热带东印度洋的水文和环流特征。模式分析表明，热带东印度洋的水文及环流特征受季风影响很大，环流由季风驱动，上层环流的季节性变化明显，温盐分布的时空变化也存在着季节性的信号。Wyrtki流和EUC的出现和消失，南赤道逆流的周期性出现和南赤道逆流的南北位置移动，以及流动速度的变化是研究区域环流季节性变化特征。本文还利用模式资料分析了2000年至2013年的春季Wyrtki流和EUC的变化情况，结果表明Wyrtki流一般在3月底至4月初出现，到4月中旬流量达到最大，平均为13.06SV；EUC并不能每年稳定出现，，一般在Wyrtki流出现后45天左右出现反向的EUC。
[Abstract]:This paper first introduces the background characteristics of the tropical eastern Indian Ocean, then briefly introduces the HYCOM model and establishes a model in the tropical eastern Indian Ocean for numerical simulation. The hydrological circulation characteristics and seasonal variation of tropical eastern Indian Ocean are analyzed by using simulated and measured data. The results of the model well reflect the characteristics of temperature, salt and current in tropical eastern Indian Ocean. The characteristics of hydrology and circulation in the tropical eastern Indian Ocean under the influence of the monsoon and during the period of monsoon transition are well reproduced. First of all, we use the observation data of the integrated scientific exploration of the eastern Indian Ocean oceanography of the National Foundation of China (NSFC) in April 2013. The hydrological and circulation characteristics of the tropical eastern Indian Ocean are analyzed and the established HYCOM model data are verified by observational data. The results show that the study area has higher temperature and lower temperature in the east and west. Both the equatorial Wyrtki current and the equatorial submersible current carry a large amount of high brine from the Arabian Sea to the east, and both Wyrtki and EUC have higher velocities. The discharge on 81 掳E section was 4.76 SV and 12.18 SVrespectively. The south equatorial countercurrent is also observed, the core is near 5 掳S, the velocity is high and the flow rate is 7.4 SV. Compared with the HYCOM simulation results, the established HYCOM can well reflect the hydrological and circulation characteristics of the tropical eastern Indian Ocean. The model analysis shows that the hydrological and circulation characteristics of the tropical eastern Indian Ocean are greatly affected by the monsoon, the circulation is driven by the monsoon, and the seasonal variation of the upper circulation is obvious. There are seasonal signals. Wyrtki current and EUC appear and disappear, the south equator countercurrent appears periodically and the south equator countercurrent moves from north to south in the temporal and spatial variation of temperature and salt distribution. And the variation of flow velocity is the characteristic of seasonal variation of regional circulation. The variation of Wyrtki flow and EUC in spring from 2000 to 2013 are also analyzed by using the model data. The results show that the Wyrtki flow generally appears from the end of March to the beginning of April. In middle of April, the flow reached the maximum, with an average of 13.06 SV. The EUC does not appear stably every year and usually appears reverse EUC about 45 days after the Wyrtki stream appears.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P731

【共引文献】