Role of Mesoscale Eddies in Modulating the Semidiurnal Internal Tide: Observation Results in the Northern South China Sea
Role of Mesoscale Eddies in Modulating the Semidiurnal Internal Tide: Observation Results in the Northern South China Sea
复制标题
中尺度涡旋对半日内潮的调节作用：南海北部的观测结果
DOI：
10.1175/jpo-d-17-0209.1
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发表时间：
2018-08
期刊：
影响因子：
--
通讯作者：
Tian Jiwei
中科院分区：
文献类型：
--
作者：
Huang Xiaodong;Wang Zhaoyun;Zhang Zhiwei;Yang Yunchao;Zhou Chun;Yang Qingxuan;Zhao Wei;Tian Jiwei
利用十字形系泊阵列观测资料，研究了中尺度涡旋对南海北部半日内潮的调节作用。2013年11月至2014年1月，一个反气旋涡旋（AE）和气旋涡旋（CE）对穿过源自吕宋海峡的西向SIT波束。观测结果表明，由于涡旋对的电流和分层调制，1型SIT在AE （CE）南部的传播速度加快（减慢）了0.7 m s-1 （0.4 m s-1）。由于相位速度的空间变化，1型SIT波峰在AE （CE）核心内呈现顺时针（逆时针）旋转，而在AE （CE）南周和北周分别呈现凸（凹）和凹（凸）模式。11月中下旬，东沙岛的大部分1型SIT能量被声发射折射到南海北部北部，导致东沙岛的内孤立波增强。与能量折射相对应的是，深度积分模态-1 SIT能量对涡旋的响应在沿波束方向系泊时普遍为同相，而在横波束方向系泊时，在南海北部南、北部部分为非同相。从12月下旬到1月上旬，观测到ii型SIT增强，其能量可能是通过涡波相互作用从i型SIT转移过来的。本文的观测结果有助于提高南海北部内部潮汐和isw的预报能力。
The role of mesoscale eddies in modulating the semidiurnal internal tide (SIT) in the northern South China Sea (SCS) is examined using the data from a cross-shaped mooring array. From November 2013 to January 2014, an anticyclonic eddy (AE) and cyclonic eddy (CE) pair crossed the westward SIT beam originating in Luzon Strait. Observations showed that, because of the current and stratification modulations by the eddy pair, the propagation speed of the mode-1 SIT sped up (slowed down) by up to 0.7 m s-1 (0.4 m s-1) within the AE's (CE's) southern portion. As a result of the spatially varying phase speed, the mode-1 SIT wave crest was clockwise rotated (counterclockwise rotated) within the AE (CE) core, while it exhibited convex and concave (concave and convex) patterns on the southern and northern peripheries of the AE (CE), respectively. In mid-to-late November, most of the mode-1 SIT energy was refracted by the AE away from Dongsha Island toward the north part of the northern SCS, which resulted in enhanced internal solitary waves (ISWs) there. Corresponding to the energy refraction, responses of the depth-integrated mode-1 SIT energy to the eddies were generally in phase at the along-beam-direction moorings but out of phase in the south and north parts of the northern SCS at the cross-beam-direction moorings. From late December to early January, intensified mode-2 SIT was observed, whose energy was likely transferred from the mode-1 SIT through eddy-wave interactions. The observation results reported here are helpful to improve the capability to predict internal tides and ISWs in the northern SCS.
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影响因子：
--
作者：
Q. Zheng;R. Susanto;Chung‐Ru Ho;Y. Song;Qing Xu
通讯作者：
Q. Zheng;R. Susanto;Chung‐Ru Ho;Y. Song;Qing Xu
影响因子：
2.2
作者：
Hai-Tien Lee;R. Ellingson
通讯作者：
Hai-Tien Lee;R. Ellingson
影响因子：
4.4
作者：
Pawlowicz, R;Beardsley, B;Lentz, S
通讯作者：
Lentz, S
影响因子：
5.2
作者：
Klymak, Jody M.;Pinkel, Robert;David, Laura
通讯作者：
David, Laura
DOI：
10.1016/j.dsr2.2007.05.008
发表时间：
2007-07
影响因子：
3
作者：
Chau‐Ron Wu;T. Chiang
通讯作者：
Chau‐Ron Wu;T. Chiang