Turbulent mixing above the Atlantic Water around the Chukchi Borderland in 2014

ZHONG Wenli; GUO Guijun; ZHAO Jinping; LI Tao; WANG Xiaoyu; MU Longjiang

doi:10.1007/s13131-018-1198-0

2014年大西洋水在楚科奇边陲区域的上边界混合

doi: 10.1007/s13131-018-1198-0

1.
中国海洋大学物理海洋重点实验室, 青岛
2.
中国海洋大学物理海洋重点实验室, 青岛;国家海洋局第一研究所海洋与气候研究中心, 青岛
3.
中国海洋大学物理海洋重点实验室, 青岛;国家海洋局国家海洋环境预报中心海洋灾害预报技术研究重点实验室, 北京

基金项目: The Key Project of Chinese Natural Science Foundation under contract No. 41330960; the National Basic Research Program (973 Program) of China under contract No. 2015CB953902; the Ph D Programs Foundation of Ministry of Education of China under contract No. 20130132110021; the National Natural Science Foundation of China under contract No. 41706211.

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- 收稿日期: 2017-05-09

Turbulent mixing above the Atlantic Water around the Chukchi Borderland in 2014

1.
Key Laboratory of Physical Oceanography, Ocean University of China, Qingdao 266100, China
2.
Key Laboratory of Physical Oceanography, Ocean University of China, Qingdao 266100, China;Center for Ocean and Climate Research, The First Institute of Oceanography, Qingdao 266061, China
3.
Key Laboratory of Physical Oceanography, Ocean University of China, Qingdao 266100, China;Key Laboratory of Research on Marine Hazards Forecasting, National Marine Environmental Forecasting Center, State Oceanic Administration, Beijing 100081, China

摘要

摘要: 依据2014年考察收集的CTD数据和湍流微结构数据，我们研究了大西洋水在楚科奇边陲区域的上边界混合环境。在海冰快速退缩的背景下，表面风场驱动上层海洋运动的效率提升，由此造就了一个“躁动”的北冰洋内部环境。结果显示在200-300m（大西洋水的上界面）深度上湍耗散率在4.60×10^-10W/kg—3.31×10^-9W/kg，平均值为1.33×10^-9W/kg，而湍扩散率在1.45×10^-6m²s^-1—1.46×10^-5m²s^-1，平均值为4.84×10^-6m²s^-1。在分析研究传统的调控湍耗散率的因素（如：风、地形、潮汐）之后，研究结果显示潮动能在大西洋水上界面的混合中扮演着主导作用。除此之外，波弗特流涡位置的摆动影响着地转流的垂直剪切并在一定程度上贡献于湍混合的区域差别。研究还利用湍流微结构数据计算的双扩散对流热通量对比验证了实验室参数化方案的可行性。
- 大西洋水 /
- 楚科奇边陲 /
- 湍耗散率 /
- 湍扩散率 /
- 表面应力
Abstract: This study presents an analysis of the CTD data and the turbulent microstructure data collected in 2014, the turbulent mixing environment above the Atlantic Water (AW) around the Chukchi Borderland region is studied. Surface wind becomes more efficient in driving the upper ocean movement along with the rapid decline of sea ice, thus results in a more restless interior of the Arctic Ocean. The turbulent dissipation rate is in the range of 4.60×10^-10-3.31×10^-9 W/kg with a mean value of 1.33×10^-9 W/kg, while the diapycnal diffusivity is in the range of 1.45×10^-6-1.46×10^-5 m²/s with a mean value of 4.84×10^-6 m²/s in 200-300 m (above the AW). After investigating on the traditional factors (i.e., wind, topography and tides) that may contribute to the turbulent dissipation rate, the results show that the tidal kinetic energy plays a dominating role in the vertical mixing above the AW. Besides, the swing of the Beaufort Gyre (BG) has an impact on the vertical shear of the geostrophic current and may contribute to the regional difference of turbulent mixing. The parameterized method for the double-diffusive convection flux above the AW is validated by the direct turbulent microstructure results.
- Atlantic Water /
- Chukchi Borderland /
- turbulent dissipation rate /
- diapycnal diffusive /
- surface stress

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2014年大西洋水在楚科奇边陲区域的上边界混合

doi: 10.1007/s13131-018-1198-0

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Turbulent mixing above the Atlantic Water around the Chukchi Borderland in 2014

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