An open-ocean forcing in the East China and Yellow seas
An open-ocean forcing in the East China and Yellow seas
复制标题
中国东部和黄海的公海强迫
DOI：
10.1029/2010jc006179
复制
发表时间：
2010-12-21
影响因子：
3.6
通讯作者：
Ju, Xia
中科院分区：
文献类型：
--
作者：
Ma, Chao;Wu, Dexing;Ju, Xia
最近的研究表明，东中国和黄海的年平均正压流主要是由开阔洋盆的海洋环流通过北太平洋副热带涡旋的西边界流--黑潮流强迫的。局地风应力强迫起着重要但次要的作用。这些以前的结果主要是定性的，来自一个由稳定的风应力场强迫的简单正压模式。它们还有待于在更完整的3-D模型中进行测试，包括风应力和浮力通量。此外，主要ECYS流的季节变化可能涉及与其年平均场不同的强迫机制，这只能在模式中使用季节性变化的强迫时才能解决。在本文中，我们将使用一个三维斜压模式来解决这些问题。我们的结果证实了前人的研究结果，即KC是ECYS主要年平均流的主要强迫机制，包括台湾海峡流、对马暖流和黄海暖流等，但局地季风强迫对该地区所有主要流的季节变化起着显著的调制作用。例如，冬季YSWC向西北方向的深层入侵主要是由于中国沿岸流和朝鲜海岸流的强劲发展，它们沿黄海海槽吸水，为黄海东西岸的南向流动提供补给。
Recent studies have demonstrated that the annual mean barotropic currents over the East China and Yellow seas (ECYS) are forced primarily by the oceanic circulation in the open‐ocean basin through the Kuroshio Current (KC), the western boundary current of the subtropical gyre in the North Pacific Ocean. The local wind stress forcing plays an important but secondary role. Those previous results were mainly qualitative and from a simple barotropic model forced by a steady wind stress field. They remain to be tested in a more complete 3‐D model with both wind stress and buoyancy fluxes. In addition, the seasonal variability of major ECYS currents may involve different forcing mechanisms than their annually averaged fields do, and this can only be addressed when a seasonally varying forcing is used in the model. In this paper, we will address these issues by using a 3‐D baroclinic model. Our results confirm the finding from the previous studies that the KC is the primary forcing mechanism for major annually mean currents in the ECYS, which include the Taiwan Strait Current, the Tsushima Warm Current, and the Yellow Sea Warm Current (YSWC), etc. However, the local monsoonal forcing plays a prominent role in modulating the seasonal variability of all major currents in the region. A deep northwestward intrusion of the YSWC in winter, for instance, is mainly due to a robustly developed China Coastal Current and Korea Coastal Current, which draw water along the Yellow Sea Trough to feed the southward flows along the west and east coasts of the Yellow Sea.