A numerical simulation of the generation and evolution of nonlinear internal waves across the Kara Strait
A numerical simulation of the generation and evolution of nonlinear internal waves across the Kara Strait
复制标题
喀拉海峡非线性内波产生与演化的数值模拟
DOI：
10.1007/s13131-019-1437-z
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发表时间：
2019-05
期刊：
影响因子：
--
通讯作者：
Zhang Zhanhai
中科院分区：
文献类型：
--
作者：
Li Qun;Wu Huiding;Yang Hongwei;Zhang Zhanhai
非线性内波 (NIW) 在喀拉海周围无处不在，喀拉海是西伯利亚北部北冰洋的一部分。 Envisat ASAR 已识别出三个内波热点源，其中之一是喀拉海峡。基于非静水力数值模型研究了海峡两岸潮汐与地形相互作用引起的NIW的产生和演化。该模型捕获了卫星数据显示的大部分波浪特征。夏季巴伦支海一侧典型的数据包间距离约为 25 km，相速度约为 0.65 m/s。向北的背景流可能会加剧生成波过程中能量的积累，但对生成波的其他特性影响不大。单一内孤立波（ISW）结构是一种跟随主波列的特殊现象，距离约为5-8公里。该波是在同一潮汐周期内与前导波包一起生成的。当包含朝向喀拉海的稳定海流时，基本产生过程类似，但朝向喀拉海的波浪减弱并呈现出内部孔状结构，其振幅比对照实验中的更小。冬季，由于海冰生长，喀拉海峡的分层主要由盐度决定，温度几乎均匀，接近冰点。密斜斜在水深中部附近（巴伦支海一侧）加深，NIWs 过程不如夏季的 NIWs 过程那么重要。模拟过程中不存在裂变过程。
Nonlinear internal waves (NIWs) are ubiquitous around the Kara Sea, a part of the Arctic Ocean that is north of Siberia. Three hot spot sources for internal waves, one of which is the Kara Strait, have been identified based on Envisat ASAR. The generation and evolution of the NIWs through the interactions of the tide and topography across the strait is studied based on a nonhydrostatic numerical model. The model captures most wave characteristics shown by satellite data. A typical inter-packets distance on the Barents Sea side is about 25 km in summer, with a phase speed about 0.65 m/s. A northward background current may intensify the accumulation of energy during generation, but it has little influence on the other properties of the generated waves. The single internal solitary wave (ISW) structure is a special phenomenon that follows major wave trains, with a distance about 5–8 km. This wave is generated with the leading wave packets during the same tidal period. When a steady current toward the Kara Sea is included, the basic generation process is similar, but the waves toward the Kara Sea weaken and display an internal bore-like structure with smaller amplitude than in the control experiment. In winter, due to the growth of sea ice, stratification across the Kara Strait is mainly determined by the salinity, with an almost uniform temperature close to freezing. A pycnocline deepens near the middle of the water depth (Barents Sea side), and the NIWs process is not as important as the NIWs process in summer. There is no fission process during the simulation.
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发表时间：
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期刊：
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