2013年吕宋暖涡的生消过程及特征研究
发布时间：2018-12-13 12:20
【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。
[Abstract]:Based on the HYCOM (HYbrid Coordinate Ocean Model) ocean model, a numerical simulation method of two layers nesting from the global to the northwest Pacific and from the northwest Pacific to the South China Sea is used. Taking 2013 as an example, the high-precision (1 / 25 掳脳 1 / 25 掳脳 25 掳脳 cos 胃) ocean dynamic data of the South China Sea are obtained. The evolution process and three-dimensional structure of Luzon warm vortex are described in detail, and the energy changes associated with the evolution of Luzon warm vortex are analyzed. It is found that the warm vortex of Luzon occurred in the northwest of Luzon Island in the middle of June, 2013. The vortex moved westward first, stayed for about a month at the end of August, then moved southwestward along the 200 m isobath, and finally died out in the middle of December. For example, on August 4, 2013, the influence depth of Luzon warm vortex can reach the bottom from the sea surface. The shape of the vortex is similar to that of a cylinder. The vortex center is inclined, and from the sea surface to the center of the sea vortex, it can be tilted about 110 km;. The maximum velocity of Luzon warm vortex can reach 0.5 m / s. The temperature in the region of Luzon warm vortex is higher than that in the surrounding area by 2 ~ 6 鈩，
本文编号：2376519
[Abstract]:Based on the HYCOM (HYbrid Coordinate Ocean Model) ocean model, a numerical simulation method of two layers nesting from the global to the northwest Pacific and from the northwest Pacific to the South China Sea is used. Taking 2013 as an example, the high-precision (1 / 25 掳脳 1 / 25 掳脳 25 掳脳 cos 胃) ocean dynamic data of the South China Sea are obtained. The evolution process and three-dimensional structure of Luzon warm vortex are described in detail, and the energy changes associated with the evolution of Luzon warm vortex are analyzed. It is found that the warm vortex of Luzon occurred in the northwest of Luzon Island in the middle of June, 2013. The vortex moved westward first, stayed for about a month at the end of August, then moved southwestward along the 200 m isobath, and finally died out in the middle of December. For example, on August 4, 2013, the influence depth of Luzon warm vortex can reach the bottom from the sea surface. The shape of the vortex is similar to that of a cylinder. The vortex center is inclined, and from the sea surface to the center of the sea vortex, it can be tilted about 110 km;. The maximum velocity of Luzon warm vortex can reach 0.5 m / s. The temperature in the region of Luzon warm vortex is higher than that in the surrounding area by 2 ~ 6 鈩，
本文编号：2376519
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