杨真真,陈学恩.2013年吕宋暖涡的生消过程及特征研究[J].海洋通报,2017,36(4):399-407
2013年吕宋暖涡的生消过程及特征研究
Propagation and characteristics of Luzon Warm Eddy in 2013
投稿时间:2016-03-02  最后修改时间:2016-04-09
DOI:10.11840/j.issn.1001-6392.2017.04.006
中文关键词:  吕宋暖涡  三维结构  涡能量分析  数值模拟  HYCOM
英文关键词:Luzon Warm Eddy  three-dimensional structure  eddy energy analysis  numerical simulation  HYCOM
基金项目:全球大洋中尺度涡旋预报和南海内孤立波预报系统研发;泰山学者工程专项经费资助
作者单位
杨真真 中国海洋大学海洋与大气学院山东青岛266100 
陈学恩 中国海洋大学海洋与大气学院山东青岛266100 
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中文摘要:
      基于 HYCOM(HYbrid Coordinate Ocean Model)海洋模式,采用全球到西北太平洋,西北太平洋到南海两层嵌套的数值模拟方法,以 2013 年为例,获得了高精度 (1/25° × 1/25° × cosθ) 的南海海洋动力数据资料。详细刻画了吕宋暖涡的演变过程及三维结构,并对吕宋暖涡演化过程中伴随的能量变化进行了分析。研究发现,2013 年 6 月中旬吕宋暖涡生成于吕宋岛西北侧,该涡先向西移动,8 月底滞留约一个月,随后沿 200 m 等深线向西南移动,最终于 12 月中旬消亡。以 2013 年8 月 4 日为例,吕宋暖涡的影响深度可从海表面到达海底,涡的形状类似于圆柱状,涡中心存在倾斜,从海表面至海底涡的中心可倾斜约 110 km;吕宋暖涡最大流速可达 0.5 m/s。吕宋暖涡所在区域的温度高于周围区域 2~6 ℃,盐度低于周围区域约 0.1~0.3 ‰,最大温度异常值为 6.5℃,盐度异常值可达-1 ‰,都出现在深度 150 m 左右的海域。吕宋暖涡的总能量可达左右,涡势能约是涡动能的 6 倍;正压能量转化与斜压能量转化之和占涡总能量变化的 76%,对涡能量变化起决定性作用。
英文摘要:
      HYCOM ((HYbrid Coordinate Ocean Model) is used to obtain the high-resolution (1/25° × 1/25° × cosθ) data of the South China Sea (SCS) , with the two-nesting method. This paper describes the generation, propagation, treedimensional structure and energy analysis of Luzon Warm Eddy (LWE) based on the data of 2013. According to the model results, the LWE was generated at southwest of Taiwan Island in the mid-June of 2013, and it initially moved westward, then moved southwestward along the 200 m isobath after staying in one place for approximately one month and ultimately disappeared in mid-December. On August 4 th, the impact depth of LWE was from surface to seabed in the shape of tilting cylinder and eddy center tilted for 110 km. For that day, the maximum velocity can be as high as 0.5 m/s while the maximum temperature anomaly at 150 meters could achieve 6.5 ℃ . The EPE of LWE could be six times as its EKE; BTI and BCI accounted for 76 % of the total eddy energy transform, which were the most important sources of eddy energy.
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