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本文首次提出了一套从反射地震数据提取反射强度、反射体倾角和反射体波动振幅等属性参数的方法,并将其应用到南海西南海域.计算结果进一步表明南海西南海域在夏季主要的海洋学现象为西南季风诱发的冷流.它首先在越南东部海域自南向北流动,然后在约12°N附近开始向东弥散.海表面表现为温度低异常和海面高度低异常;水体内部则表现为以温度低异常为特征的底层冷水上涌.同时,由于地震海洋学数据具有高横向分辨率和全海洋深度成像的优点,从计算结果中还可以识别出3个视宽度为~20 km的上升流区;其上涌的视幅度约为50~150 m,且在不同的深度具有各自的特点.我们的结果可以为南海西南海域夏季上升流的精细化、定量化研究提供必不可少的数据支持;这套方法在其他海域的扩展应用也有望成为研究海水垂向分布横向变化的有力工具.
This paper presents for the first time a set of method for extracting attribute parameters such as reflection intensity, reflection body dip angle and reflection body fluctuation amplitude from reflected seismic data and applies it to the southwest sea area of South China Sea.The calculation results further show that the main oceanography The phenomenon is the cold flow induced by the southwesterly monsoon, which firstly flows from south to north in the east of Vietnam and then begins to diffuse to the east near about 12 ° N. The sea surface is characterized by low temperature anomalies and low sea level anomalies, while the interior of water bodies Which is characterized by low-temperature anomalies in the bottom of the cold water upwelling.At the same time, due to seismic oceanographic data with high lateral resolution and full ocean depth imaging advantages, can also be identified from the results of the three visual width ~ 20 km Upwelling area, and its upwelling magnitude is about 50-150 m, and has its own characteristics at different depths.Our results can provide the necessary proof for the refinement and quantification of summer upwelling in the Southwest Sea of South China Sea Data support; the expanded application of this method in other sea areas is also expected to be a powerful tool for studying the lateral variation of vertical distribution of seawater.