Effects of mesoscale eddies on the volume transport and branch pattern of the Kuroshio east of Taiwan
Effects of mesoscale eddies on the volume transport and branch pattern of the Kuroshio east of Taiwan
复制标题
中尺度涡旋对台湾东部黑潮体积输送及分支格局的影响
DOI：
10.1002/2016jc012038
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Zhang Linlin
中科院分区：
文献类型：
--
作者：
Yan Xiaomei;Zhu Xiao-Hua;Pang Chongguang;Zhang Linlin
利用卫星高度计资料和台湾东北黑潮长期高度计输送指数，从个别事件到年际尺度，研究了中尺度涡旋对东台湾海峡黑潮流量输送的影响和台湾以东黑潮的分叉模式。反气旋性涡旋和气旋性涡旋都能够加强或减弱KVT，这取决于涡旋上游和下游产生的质量辐合和散度的相对强度。影响黑潮入流强度的主要因素是涡旋的经向位置。对于单次涡旋事件，KVT与涡旋中心纬度显著相关，反气旋型和气旋型涡旋的相关系数分别为0.44和-0.48。对于偶极子涡旋事件，当方向角落在40°-150°(240°-300°)区间时，KVT异常趋于正(负)。此外，低KVT事件一般对应于琉球海流分支的形成，琉球海流分支也是由涡旋产生的强质量散度产生的。此外，在年际尺度上，KVT的变化与125°E以西的反气旋性涡旋与气旋性涡旋的相对数量密切相关，相关系数为0.5。这篇文章受版权保护。版权所有。
Using satellite altimeter data and a long-term altimetric transport index for the Kuroshio inflow northeast of Taiwan, the effects of mesoscale eddies on the Kuroshio volume transport (KVT) at the East Taiwan Channel and the branching pattern of the Kuroshio east of Taiwan are investigated at scales from those of individual events to interannual timescales. Both anticyclonic and cyclonic eddies are found to be able either to strengthen or weaken the KVT, depending on the relative strength of mass convergence and divergence produced upstream and downstream of the eddies. The major factor influencing the intensity of the Kuroshio inflow is the meridional location of the eddies. For single eddy events, the KVT is significantly correlated with the latitude of the eddy's center, the correlations being 0.44 and -0.48 for anticyclonic and cyclonic eddies, respectively. For dipole eddy events, when the direction angle falls in the interval 40°-150° (240°-300°), the KVT anomaly tends to be positive (negative). Furthermore, low KVT events generally correspond to the formation of the Ryukyu Current branch, which is also generated from strong mass divergence produced by the eddies. In addition, on interannual time scales, the variation of KVT is closely related to the relative number of anticyclonic to cyclonic eddies west of 125°E, with a correlation of 0.5. This article is protected by copyright. All rights reserved.