湾流锋强度空间变化及季节变化特征研究

Study on the intensity characteristics of seasonal variation and space distribution of Gulf Stream front

基于WOA13数据可以较好的表现海洋锋强度的变化特征这一特点,选用分辨率为1/4°的1955-2012年58年季节平均数据分析了湾流锋轴线上温度、盐度绝对梯度的空间分布特征、季节的变化的强弱规律、温、盐关系,并运用BELLHOP模型对锋区声场特点进行了分析。分析表明湾流锋轴线水平位置及其强度随着深度变化比较明显,在锋轴线上温、盐强度的正相关性显著,锋区内声道的形成与季节以及声源深度关系密切。

Based on the characteristics of better describing the changing features of ocean front strength, the seasonal mean WOA13 data whose resolution is 1/4 degree is chosen to analyze the space distribution, seasonal changes of Gulf Stream front, temperature and salinitys absolute gradient, relationship of temperature and salinity, and BELLHOP model is used to analyze the acoustic characteristics of the frontal zone. The axis horizontal position and intensity of Gulf Stream front vary quite obviously with the depth. In the axis, the thermohaline strength has significantly positive correlation, and the front zone channel is influenced by seasonal change and source depth.