南海北部内孤立波生成对黑潮响应的初步研究

发布时间：2018-04-10 21:53

本文选题：内波 + 合成孔径雷达图像　；参考：《海洋科学》2016年02期

【摘要】：为了研究南海北部黑潮入侵对内孤立波生成造成的影响,本研究在对合成孔径雷达图像处理分析的基础上,运用二维非静力模式,对南海北部内孤立波生成以及其对黑潮入侵的响应做了初步的模拟和分析。对4 a(2007~2010年)的合成孔径雷达(SAR)图像统计分析发现,内波出现频率呈现明显的季节变化。月平均数据表明,内波出现频率在5月到8月期间较高并在6月达到峰值,占全年总数的29%;而在11月到次年的2月份期间出现频率较低并在12月和1月达到最低,各占全年的0.5%。通过二维、非静力近似数值模拟研究发现:黑潮入侵引起的平流对吕宋海峡区域内孤立波的激发产生具有明显的影响。具体表现为,黑潮入侵引起的的西向平均流拉伸了内孤立波波形并加强内孤立波的能量的频散,使得大振幅内孤立波演变成多个分散的波动,波长变长、振幅变小。敏感性实验通过替换夏季温盐场为冬季温盐场,对模拟结果并无实质上的影响,表明冬夏季温盐场的差异并非是SAR观测内波出现频率呈季节变化的重要因素。
[Abstract]:In order to study the influence of the Kuroshio intrusion on the generation of internal solitary waves in the northern South China Sea, a two-dimensional non-static model is used based on the analysis of synthetic Aperture Radar (SAR) image processing.The generation of solitary waves in the northern part of the South China Sea and its response to the Kuroshio intrusion are preliminarily simulated and analyzed.The statistical analysis of synthetic Aperture Radar (SAR) images from 2007 to 2010) shows that the frequency of internal wave appears seasonally.The monthly average data showed that the frequency of internal waves was higher between May and August and reached its peak in June, accounting for 29 percent of the total for the whole year, while it was lower in the period from November to February and lowest in December and January, accounting for 0.5 percent of the year's total.It is found that the advection caused by the Kuroshio invasion has a significant effect on the excitation of solitary waves in the Luzon Strait region.In particular, the westward average flow caused by the Kuroshio invasion stretched the internal solitary wave waveform and strengthened the dispersion of the energy of the internal solitary wave, so that the large amplitude internal solitary wave evolved into a number of scattered waves, the wavelength became longer and the amplitude became smaller.By replacing the summer temperature and salt field with the winter temperature and salt field, the sensitivity experiment has no substantial effect on the simulation results, which indicates that the difference of the temperature and salt field in winter and summer is not an important factor in the seasonal variation of the frequency of internal waves observed by SAR.
【作者单位】：中国科学院海洋研究所;中国科学院大学;中国科学院海洋环流与波动重点实验室;
【基金】：国家自然科学基金重点项目(41030855)~~
【分类号】：P731.2

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