北欧海中尺度涡旋特征分析

发布时间：2018-01-02 19:42

本文关键词：北欧海中尺度涡旋特征分析　出处：《海洋科学进展》2016年02期 　论文类型：期刊论文

【摘要】：基于Nencioli等的涡旋判定方法,借助于高分辨率卫星高度计反演的地转流异常数据和海平面异常数据,对北欧海域2012年的中尺度涡旋进行了识别和对比验证,并系统分析了该海域中尺度涡旋的空间分布、生命周期、半径范围和运移路径及速度等基本特征。结果显示,在北欧海域,选取网格间距a=3,b=2进行涡旋识别所得到的位置与海表高度的正负异常几乎一一对应,表明结果是可信、可靠的。北欧海域存在生命周期2周以上的气旋涡280个,反气旋涡316个,其中生命周期大于4周的涡旋数量约有20%。该海域中尺度涡旋主要集中分布在寒暖流交汇区和挪威沿岸海域,受大尺度环流影响,0°经线以东海域的涡旋呈向南移动的趋势,约有40%的涡旋移动速度为10cm·s-1,最大可达20cm·s-1,而沿岸海域的涡旋受地形影响,呈原地旋转的运动状态。
[Abstract]:Based on the vortex determination method of Nencioli et al, the geostrophic current anomaly data and sea level anomaly data are retrieved by high-resolution satellite altimeter. The mesoscale vortices in northern Europe in 2012 were identified and compared, and the spatial distribution and life cycle of mesoscale vortices were analyzed systematically. Radius range, migration path and velocity, etc. The results show that in the northern Europe sea area, the grid spacing (A3) is selected. The position obtained by bt2 vortex recognition is almost one-to-one corresponding to the positive and negative anomalies of sea surface height, which indicates that the results are reliable and reliable. There are 280 gas vortices with a life cycle of more than 2 weeks in northern Europe. There are 316 reverse vortex, of which there are about 20 vortices whose life cycle is longer than 4 weeks. The mesoscale vortices in this sea area are mainly distributed in the cold warm current intersection area and the waters off the coast of Norway, which are affected by large-scale circulation. The vortices in the sea area east of the 0 掳longitude line tend to move southward. About 40% vortices move at a velocity of 10cm 路s-1and the maximum is 20cm 路s-1. however, the vortices in coastal waters are affected by topography. A state of motion that rotates in place.
【作者单位】：上海海洋大学海洋科学学院;大洋渔业资源可持续利用省部共建教育部重点实验室;
【基金】：全球变化研究国家重大科学研究计划项目——北极海冰减退引起的北极放大机理与全球气候效应(2015CB9539) 南北极环境综合调查与评估专项——北极海域物理海洋和海洋气象考察(CHINARE2014-03-01) 高校新进教师科研启动基金项目——基于FVCOM的中尺度涡演变机制研究(A1-2035-15-0021-110)
【分类号】：P731.2
【正文快照】： 北欧海是由西部的格陵兰岛、南部的冰岛和东部的挪威沿岸围成的半开放海域,也是由不同海脊分隔的格陵兰海、冰岛海和挪威海三个海区的统称。北欧海作为北大西洋和北冰洋之间的过渡区域,是驱动全球海洋热盐环流的重要海区之一,也是北大西洋深层水的重要形成区域之一,在全球气候

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