Features of Intraseasonal Variability Observed in the Upper-Layer Current in the Northern South China Sea
Features of Intraseasonal Variability Observed in the Upper-Layer Current in the Northern South China Sea
复制标题
南海北部上层洋流季节内变化特征
DOI：
10.3389/fmars.2021.777262
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发表时间：
2021-12
影响因子：
3.7
通讯作者：
Yunkai He
中科院分区：
文献类型：
--
作者：
Wen Xu;Yeqiang Shu;Dongxiao Wang;Ju Chen;Jinghong Wang;Qiang Xie;Qiang Wang;Danian Liu;Tingting Zu;Yunkai He
利用4个长期的系泊观测资料和高度计资料，揭示了南海北方上层海流强季节内变率的特征。南海上层流的ISV由10-65天和65-110天两个主要周期组成。周期为10-65天的ISV在吕宋海峡较强，沿陆坡向沿着向西迅速衰减。周期为65-110天的ISV在115 ° E和119°E两个高核的沿着斜坡较强，而在吕宋海峡较弱。10-65日龄的ISV大部分时间可以直接从西太平洋进入南海。然而，由于其长波长，65-110天的ISV间接传播到NSCS中，可能类似于波衍射现象。两个主要频带的空间差异主要是由于斜压和正压不稳定。上层ISV的空间分布与南海中尺度涡半径有密切的关系。涡旋半径与65-110天的ISV强度成正比，而与10-65天的ISV强度成反比。
This study reveals the features of the strong intraseasonal variability (ISV) of the upper-layer current in the northern South China Sea (NSCS) based on four long-time mooring observations and altimeter data. The ISV of the upper-layer current in the NSCS consists of two dominant periods of 10–65 days and 65–110 days. The ISV with period of 10–65 days is much strong in the Luzon Strait and decays rapidly westward along the slope. The ISV with the period of 65–110 days is relatively strong along the slope with two high cores at 115 and 119°E, whereas it is weak in the Luzon Strait. The 10–65-day ISV can propagate directly from the western Pacific into the NSCS for most of the time. However, due to its long wavelength, the 65–110-day ISV propagates into the NSCS indirectly, possibly similar to the wave diffraction phenomenon. The spatial differences between the two main frequency bands are primarily due to the baroclinic and barotropic instabilities. The spatial distribution of the upper-layer ISV is closely associated with the mesoscale eddy radius of the NSCS. The eddy radius is directly proportional to the strength of 65–110-day ISV, but it is inversely proportional to the strength of 10–65-day ISV.
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影响因子：
3
作者：
Wendl MC
通讯作者：
Wendl MC
影响因子：
3.5
作者：
Haiyuan Yang;Lixin Wu;Shantong Sun;Zhaohui Chen
通讯作者：
Haiyuan Yang;Lixin Wu;Shantong Sun;Zhaohui Chen
影响因子：
3.6
作者：
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通讯作者：
Haidvogel, D. B.
影响因子：
2.3
作者：
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通讯作者：
Chau‐Ron Wu;T. Tang;S. F. Lin
影响因子：
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作者：
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通讯作者：
Danyi Su;P. Lin;H. Mao;Jiaxue Wu;Hailong Liu;Yongsheng Cui;C. Qiu