基于CTD数据的东海黑潮锋特征研究

Analysis on the Characteristics of Kuroshio Front in the East China Sea Based on CTD Data

基于东海PN断面多年CTD实测资料,主要从PN断面上的温盐结构和声场结构两个方面进行研究,统计分析PN断面上东海黑潮边界锋的水文要素特征。文章利用Matlab软件对资料中所涉及的温盐数据绘制等值线图,描绘出PN断面上关于测站位置、温盐分布特点,利用Mackenzie公式计算声速分布及其变化,从而构成温、盐、声三种要素的断面分布图。此外还进一步分析了PN断面温盐断面结构,得到黑潮锋的分布与强度特征。并对黑潮锋的季节变化规律进行分析,得出夏秋季节黑潮在PN断面上的海洋锋强度相对于冬春季节要大、冬季最弱等结论。

Based on the CTD data collected on the PN section located in the East China Sea, this paper mainly focuses on the temperature, salinity and sound propagation simulation of the PN section. It also conducts statistical analysis on the hydrological characteristic elements in the Kuroshio boundary layer front on the PN section in the East China Sea. The contour map derived from temperature and salinity data with Matlab is used to describe the position of observing stations and the distribution features of temperature and salinity on the PN section. The Mackenzie formula is used to calculate sound distribution and changes, thus obtaining temperature,salinity and sound cross-section diagram. This paper further analyzes the temperature and salinity cross-section structure on the PN section to obtain the distribution and intensity characteristics of the Kuroshio zone front. In addition, the seasonal variability of the Kuroshio zone front is studied, reaching a conclusion that the Kuroshio front is more powerful during summer and autumn than that during winter and spring, and the front intensity is weakest during winter months.