Features of near-inertial motions observed on the northern South China Sea shelf during the passage of two typhoons
Features of near-inertial motions observed on the northern South China Sea shelf during the passage of two typhoons
复制标题
两次台风过境期间南海北部陆架近惯性运动特征
DOI：
10.1007/s13131-015-0594-y
复制
发表时间：
2015-01
期刊：
影响因子：
--
通讯作者：
Polton Jeff A.
中科院分区：
文献类型：
--
作者：
Chen Shengli;Hu Jianyu;Polton Jeff A.
在2009年夏季两个台风过境期间，观测到南海北方陆架（60 m深）近惯性运动的特征。在亚惯性频率和超惯性频率处的谱中存在两个峰。超惯性能量在表层附近最大，而亚惯性能量在15 m的深层最大。负背景涡度引起频率的亚惯性移动。这种超惯性移动可能是由于从高纬度传播的近惯性波造成的。近惯性流在中深度（25-30 m）表现出两层分离的模式，上层的相位与下层的相位几乎相反。相位的垂直传播意味着近惯性能量不是向下的。近惯性能的向上通量在近地层（<17 m）更为明显。在17 m和40 m处存在两个边界，近惯性能量在这两个边界处向上和向下反射。近惯性运动是间歇性的，峰值可达30 cm/s。台风浪卡的通过产生了强烈的近惯性事件，但台风林发没有。这种差异归因于相对系泊位置，系泊位置位于Nangka路径的右手侧（导致风型随时间顺时针旋转），而位于Linfa路径的左手侧（导致风型随时间逆时针旋转）。
Features of near-inertial motions on the shelf (60 m deep) of the northern South China Sea were observed under the passage of two typhoons during the summer of 2009. There are two peaks in spectra at both sub-inertial and super-inertial frequencies. The super-inertial energy maximizes near the surface, while the sub-inertial energy maximizes at a deeper layer of 15 m. The sub-inertial shift of frequency is induced by the negative background vorticity. The super-inertial shift is probably attributed to the near-inertial wave propagating from higher latitudes. The near-inertial currents exhibit a two-layer pattern being separated at mid-depth (25–30 m), with the phase in the upper layer being nearly opposite to that in the lower layer. The vertical propagation of phase implies that the near-inertial energy is not dominantly downward. The upward flux of the near-inertial energy is more evident at the surface layer (<17 m). There exist two boundaries at 17 and 40 m, where the near-inertial energy is reflected upward and downward. The near-inertial motion is intermittent and can reach a peak of as much as 30 cm/s. The passage of Typhoon Nangka generates an intensive near-inertial event, but Typhoon Linfa does not. This difference is attributed to the relative mooring locations, which is on the right hand side of Nangka’s path (leading to a wind pattern rotating clockwise with time) and is on the left hand side of Linfa’s path (leading to a wind pattern rotating anti-clockwise with time).
登录
查看更多内容
影响因子：
--
作者：
R. Shearman
通讯作者：
R. Shearman
DOI：
10.1007/978-1-4615-6648-9_15
发表时间：
1983
期刊：
--
影响因子：
--
作者：
C. Millot;C. Moulin
通讯作者：
C. Millot;C. Moulin
影响因子：
25.2
作者：
F. Webster
通讯作者：
F. Webster
影响因子：
--
作者：
Xin‐Zhong Liang;Xiaoqian Zhang;Jiwei Tian
通讯作者：
Xin‐Zhong Liang;Xiaoqian Zhang;Jiwei Tian
影响因子：
3.5
作者：
E. Kunze
通讯作者：
E. Kunze