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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Modeling of Internal Tides in the Western Bay of Bengal: Characteristics and Energetics
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Modeling of Internal Tides in the Western Bay of Bengal: Characteristics and Energetics

机译：孟加拉西湾内部潮汐建模：特征与能量学

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摘要

Generation and propagation of internal tides in the western Bay of Bengal (BoB) are investigated using observations from Acoustic Doppler Current Profilers and simulations from a very high resolution numerical ocean model. Observations show that semidiurnal internal tides in the southern and northern parts of the western BoB are more energetic during neap phase of the local barotropic tide than those during spring phase. Numerical simulations indicate that internal tides generated over the Andaman-Nicobar Ridge propagate westward for about 1,000-1,450 km across the BoB and finally impinge on the continental slopes off the east coast of India after 5-7 days. Energetic internal tides observed during the neap phase of the barotropic tides in the western BoB are mainly due to the arrival of remotely generated internal tides. We show that the variation in the onshore transmission of these remotely generated internal tides due to the topographic slope in the western BoB controls the strength of internal tide activity along the shelf. Superposition of reflected internal tides from continental slope, which are very steep in some regions and onshore propagating-waves generate partly standing waves. Numerical experiments suggest that internal tides coming from remote sources account for more than 80% of the total internal tide energy observed in the western BoB. Internal tide energy dissipation on the continental margins of the western BoB is about 3 to 4 times larger than the local generation, indicating that this region is a sink for remotely generated internal tide energy.
机译：使用来自非常高分辨率数值海洋模型的声学多普勒电流分析仪和模拟的观测来研究孟加拉湾西部湾的内部潮汐的生成和繁殖。观察结果表明，西鲍勃的南部和北部的半潮在局部波衡潮的Neap阶段比春季期间的阶段更高的能量。数值模拟表明，在安达曼 - 尼科巴尔山脊上产生的内部潮汐向西传播约1,000-1,450公里的鲍勃，最后在5-7天后在印度东海岸的大陆坡上撞击。在西班牙鲍勃的波奇潮汐潮汐的NeAP阶段观察到的精力充沛的内部潮汐主要是由于远程产生的内部潮汐的到来。我们表明，由于西鲍勃中的地形斜坡，这些远程产生了这些远程产生的内部潮汐的变化控制了沿着架子的内部潮汐活动的强度。来自大陆坡的反射内部潮汐的叠加，在某些地区和陆上传播波的大陆坡度非常陡峭地产生部分站立的波浪。数值实验表明，来自远程来源的内部潮汐占西部鲍勃中观察到的总内部潮汐能量的80％以上。内部潮汐能量耗散在西鲍勃的大陆边缘大约比地方一代大约3到4倍，表明该地区是远程产生内部潮汐能的水槽。

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