基于遥感的东海黑潮锋时空变化研究

发布时间：2018-03-24 07:05

本文选题：黑潮　切入点：黑潮锋　出处：《中国石油大学(华东)》2015年硕士论文

【摘要】：黑潮是著名的北太平洋西边界流,具有流速强、流量大、流程长以及高温、高盐、高透明度特点。它流经我国东海,对于东海的各种水文特性起着决定性的作用。同时也会影响中国东南部沿海水域的渔场变动、海雾消长、污染物漂移和生物区系的分布、舰船航行等,更重要的是它还与沿岸地区的气候变化等有着密切的关系。黑潮锋是黑潮水团和近岸水团的交汇处,其时空变化也是黑潮变化的一部分,其研究可以帮助人们更好的认识黑潮的运动规律。遥感技术的发展为黑潮研究提供了新的技术手段,其可以对同一地区进行长时间的连续的大面积同步观测,且具有较高空间和时间分辨率。因此其对海洋中各种尺度的现象的观测具有良好的适应性。本文采用2004年到2013年10年间每日的东海的MODIS L1b数据。经过数据预处理、海表温度反演,获得东海区SST数据,利用此数据通过统计分析给出了东海黑潮锋的最小温度锋判别标准。以此标准对利用SST数据经过梯度计算得到的梯度图像进行判别得到温度锋图像。建立黑潮锋提取原则,对黑潮锋进行提取。利用与黑潮路径垂直的多条线段辅助在多种时间尺度上对黑潮锋的时空变化进行了时空分析。得到以下结论:东海黑潮锋的短时间位置变化幅度较大;年际间平均位置较稳定;多年的黑潮锋季节变化不具有一致性。
[Abstract]:The Kuroshio is a famous western boundary current in the North Pacific Ocean, which has the characteristics of high velocity, large flow rate, long flow, high temperature, high salt and high transparency. It flows through the East China Sea. It plays a decisive role in various hydrological characteristics of the East China Sea. At the same time, it will also affect the fishery changes in the coastal waters of southeastern China, the rise and fall of sea fog, the drift of pollutants, the distribution of biota, the navigation of ships, etc. More importantly, it is also closely related to climate change in coastal areas. The Kuroshio front is the junction of Kuroshio and coastal water masses, and its temporal and spatial variations are also part of the Kuroshio changes. Its research can help people better understand the law of Kuroshio movement. The development of remote sensing technology provides a new technical means for Kuroshio research, which can carry out long-term continuous large-scale synchronous observation in the same area. It has high spatial and temporal resolution, so it has good adaptability to observe phenomena of various scales in the ocean. In this paper, the daily MODIS L1b data of the East China Sea from 2004 to 2013 are used. Sea surface temperature inversion to obtain the East China Sea SST data, Using this data, the minimum temperature front criterion of Kuroshio front in the East China Sea is given by statistical analysis. The temperature front image is obtained by discriminating the gradient image obtained by gradient calculation from SST data, and the principle of extracting Kuroshio front is established. The Kuroshio front was extracted. The temporal and spatial variation of the Kuroshio front was analyzed on various time scales with the aid of several lines perpendicular to the Kuroshio path. The following conclusions are obtained: the short time position of the Kuroshio front in the East China Sea varies greatly; The annual mean position is stable and the seasonal variation of the Kuroshio front is not consistent.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P731.27;P715.7

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