Near-inertial oscillations in seasonal highly stratified shallow water
Near-inertial oscillations in seasonal highly stratified shallow water
复制标题
季节性高度分层浅水中的近惯性振荡
DOI：
10.1016/j.ecss.2021.107445
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发表时间：
2021-09
影响因子：
2.8
通讯作者：
Yin Baoshu
中科院分区：
文献类型：
--
作者：
Song Dehai;Gao Gu;ong;Xia Yingying;Ren Zhaopeng;Liu Junliang;Bao Xianwen;Yin Baoshu
黄海（YS）由于底层冷水（BCW）的存在，也被称为YS冷水团（YSCWM），是高度季节性分层的。2009年6月至2014年8月的间歇性观测表明，在3月至10月期间，近惯性振荡（NIO）可被天气系统激发。NIO的大小取决于风功和水分层。因此，极端的风事件，如热带气旋，破坏浅水区，不利于NIO。一般而言，个别天气系统引起的NIO较弱，但2009年7月6日至22日发生的NIO事件由四个热带气旋激发，可导致0.3 ms−1的近惯性流速。这一事件期间的平均风力功为1.32 × 10− 3 Wm −2，估计有42.67兆瓦的能量从风转移到YS。然而，只有6.1%~8.4%的风功可以传递到BCW内部。平衡分析表明，大部分能量耗散混合的高度分层的水，而不是由底部摩擦阻尼。垂直方向的NIO频率蓝移也表明不同层之间的能量耗散较高。黄海西南环流的减弱减弱了垂直层结，从而减弱了NIO的增长。风功的计算取决于风阻力系数的计算以及将测风高度换算成距地面10 m的高度。一般情况下，采用不同方法计算的风功相差10%左右。
The Yellow Sea (YS) is highly stratified seasonally due to the presence of the bottom cold water (BCW), also called the YS Cold Water Mass (YSCWM). Intermittent measurements from June 2009 to August 2014 show that the near-inertial oscillation (NIO) can be excited by synoptic weather systems during the presence of the YSCWM between March and October. The magnitude of the NIOs depends on both the wind work and the water stratification. Thus, extreme wind events, such as tropical cyclones, destratify the shallow water and are unfavorable for NIOs. In general, the NIO induced by individual synoptic system is weak, but the event occurred from 6 to 22 July 2009 excited by four extratropical cyclones can result in a near-inertial current speed of 0.3 ms−1. The average wind work during this event was 1.32 × 10−3Wm−2, and estimates of 42.67 MW energy transferred from wind into the YS during this event. However, only 6.1%~8.4% of the wind work can be transited into the BCW interior. Budget analysis indicates most energy is dissipated to mix the highly stratified water rather than damped by the bottom friction. The NIO frequency blueshift in the vertical also indicates higher energy dissipation between different layers. The decline of the YSCWM weakens the vertical stratification and thus the growth of NIOs. The calculation of wind work depends on the computation of wind drag coefficient and the conversion from wind measured height to 10 m above surface. In general, there is about 10% difference on wind work by using different methods.
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