Interaction between the trigger meander of the Kuroshio and the abyssal anticyclone over Koshu Seamount as seen in the reanalysis data
Interaction between the trigger meander of the Kuroshio and the abyssal anticyclone over Koshu Seamount as seen in the reanalysis data
复制标题
DOI：
10.1029/2009gl039389
复制
发表时间：
2009-09
影响因子：
5.2
通讯作者：
T. Endoh;T. Hibiya
中科院分区：
文献类型：
--
作者：
T. Endoh;T. Hibiya
利用日本近海可预报性试验（JCOPE）再分析资料，分析了2004年黑潮从非大弯曲路径向大弯曲路径的转变。在此之前，在九州东南沿海产生了“触发曲流”，然后向东传播。经过盐岬后，触发曲流在Koshu海山（位于盐岬以南约200公里处）迅速放大，伴随的深海反气旋显著增强。在深海反气旋穿越黑潮的曲流槽上游出现强烈的下沉流，导致上（下）洋垂直涡旋的拉伸（收缩），由此产生的深海反气旋的增强进一步放大了上（下）洋曲流槽。所有这些特征都与模型结果吻合得很好，表明斜压不稳定性在Koshu海山形成大弯曲路径中的重要性。
The JCOPE (Japan Coastal Ocean Predictability Experiment) reanalysis data is analyzed to examine the transition from the non‐large meander path to the large meander path of the Kuroshio that occurred in 2004. It was preceded by the generation of “trigger meander” off the southeastern coast of Kyushu, which then propagated eastward. After passing Cape Shiono‐misaki, the trigger meander amplified rapidly over Koshu Seamount (located about 200 km to the south of Cape Shiono‐misaki) where the accompanying abyssal anticyclone was significantly enhanced. Strong downwelling occurred upstream of the meander trough where the abyssal anticyclone crossed the Kuroshio, causing the vertical vortex stretching (shrinking) in the upper (lower) ocean; the resulting enhanced abyssal anticyclone further amplified the meander trough in the upper ocean. All of these features agree well with the model results suggesting the importance of baroclinic instability over Koshu Seamount in the formation of the large meander path.