基于MODIS遥感影像的安达曼海内波特征参数分布及生成周期研究

本文基于2017年634幅MODIS影像分析了安达曼海3个典型区域的内波空间分布特征，定量统计了波峰线长度、波包面积等特征参数，利用射线追踪法探讨了内波的潜在激发源并推算了内波的生成周期。研究表明，安达曼海北部海域的内波空间尺度较小，前导波波峰线的平均长度约为107 km，平均波包面积约为1 860 km2，内波的传播方向主要为东向以及西南向。安达曼海中部海域内波前导波波峰线的平均长度约为133 km，平均波包面积约为3 503 km2，超过70%的内波沿东偏北方向传播。苏门答腊岛北部海域内波前导波波峰线的平均长度约为131 km，平均波包面积约为2 997 km2，内波的传播方向主要为东向、东北向及东南向。安达曼海共有7个潜在内波激发源，内波的生成时间间隔介于11.5～13 h，具有明显的半日周期特征。

Research on characteristic parameter distribution and generation period of internal waves in the Andaman Sea with MODIS

Based on the 634 MODIS images acquired in 2017, a total of 1 793 internal waves information are extracted. The paper analyzes the spatial distribution of internal waves in three typical regions of the Andaman Sea, quantitatively counts the characteristic parameters such as the length of the leading waves and the area of the wave packets. The potential sources of internal waves are discussed by ray tracing method and estimates the generation period of internal waves. The results show that the internal waves in the northern Andaman Sea have a small spatial scale. The average length of the leading waves is about 107 km, the average wave packet area is about 1 860 km², and the propagation direction is mainly eastward and southwestward. The average length of the leading waves in the central Andaman Sea is about 133 km, and the average wave packet area is about 3503 km². More than 70% of the internal waves propagate in the northeast direction. The average length of the leading waves in the northern part of the Sumatra Island is about 131 km, the average wave packet area is about 2 997 km², and the propagation direction of internal waves is mainly eastward, northeastward and southeastward. There are 7 potential internal wave sources in the Andaman Sea. The internal waves generation period is between 11.5 hours and 13 hours, which has obvious characteristics of half-day period.