地震海洋学新进展

New progress in seismic oceanography

多尺度动力过程是当前海洋学研究的重点。地震海洋学能在数百km的剖面上获得分辨率为10 m的高质量数据,基于该数据能够解析涡旋边缘的亚中尺度动力现象(如北冰洋地震剖面研究发现的漂亮旋臂)和内孤立波的振幅垂向结构,并能够进行内孤立波波形变化与混合参数分布叠合分析等,本文对这些方面获得的新认识和新进展进行了综述。同时,共偏移距剖面叠前偏移方法充分利用多道地震的多次覆盖特点,获得随时间变化的一系列地震图像,为地震海洋学在海洋内部结构的时空演变研究方面增添了利器。因此,地震海洋学提供的新的时空视角必将在海洋多尺度动力过程研究中起到重要作用。

Ocean multi-scale dynamic processes are the focus of current oceanography research.Seismic oceanography can obtain high-quality data with a resolution of 10 m on hundreds of km section,so it can analyze the sub-mesoscale dynamic phenomenon at the edge of an eddy(such as the beautiful spiral arm found in the Arctic Ocean seismic section study)and the vertical amplitude structure of the internal solitary waves,and can combine the internal solitary wave waveform change with the mixing parameter distribution.This paper reviews the new insights and advances of these studies.At the same time,the common offset section prestack migration method makes full use of the multiple coverage characteristics of multi-channel seismic method to obtain the temporal variation of seismic images,thus adding a key tool for seismic oceanography to reveal the spatio-temporal evolution of the ocean internal structure.Therefore,the new space-time perspective provided by seismic oceanography will play an important role in the study of ocean multi-scale dynamic processes.