南极普里兹湾海域湍流扩散系数估计

发布时间：2018-06-18 04:12

本文选题：普里兹湾 + Thorpe尺度　；参考：《海洋学研究》2017年01期

【摘要】：基于Thorpe尺度方法,利用CTD数据,计算了南极普里兹湾海域的Thorpe尺度和湍流扩散系数,分析了观测区域(64°~69°S,66°~80°E)湍流翻转现象的强弱及分布。结果表明,在海底和地形粗糙区存在较大的Thorpe尺度(较强湍流翻转)和湍流扩散系数,湍流扩散系数最大值能达到10~(-2) m~2/s量级,比平坦开阔海洋高2~3个数量级,部分观测站位的湍流扩散系数和湍动能耗散率表现出大-小-大的垂向分布结构,总水深较深的区域尤为明显;深水区域的浮力频率在海表面到500m层比较大,浅水区域该现象不明显;湍动能耗散率在(67.25°S,73°E)周围和经度为78°E的各站位都表现相对较大,能达到10~(-6) w/kg量级,个别站位甚至能达到10~(-5) w/kg量级。
[Abstract]:Based on Thorpe scale method and CTD data, the Thorpe scale and turbulent diffusion coefficient in Prydz Bay, Antarctica are calculated, and the intensity and distribution of turbulence inversion in the observed area of 64 掳~ 69 掳S ~ (66) ~ (66 掳) ~ 80 掳E are analyzed. The results show that there is a large Thorpe scale (strong turbulence inversion) and turbulent diffusion coefficient in the rough area of sea floor and topography. The maximum turbulent diffusion coefficient can reach 10 ~ 2) mm2 / s, which is 2 ~ 3 orders of magnitude higher than that of flat open ocean. The turbulent diffusion coefficient and turbulent kinetic energy dissipation rate of some observational stations show a large-small-large vertical distribution structure, especially in the deep area of total water depth, and the buoyancy frequency in the deep water region is relatively large from the sea surface to the 500m layer. In shallow water, this phenomenon is not obvious, and the turbulent kinetic energy dissipation rate is relatively large at the stations with longitude of 78 掳E and around 67.25 掳S ~ (-1) 73 掳E, reaching the order of 10 ~ (-6) w/kg and even 10 ~ (-5) w/kg at individual stations.
【作者单位】：卫星海洋环境动力学国家重点实验室;国家海洋局第二海洋研究所;国家海洋局第一海洋研究所;
【基金】：南北极环境综合考察与评估专项项目资助(CHINARE 2015-01-01,CHINARE2016-04-01-01) 全球变化与海气相互作用专项项目资助(GASI-03-01-01-07) 国家自然科学基金项目资助(41376033) 国家海洋局第二海洋研究所基本科研业务费专项项目资助(SOEDZZ1517,SOEDZZ1519,JT1506)
【分类号】：P731.26

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