National Taiwan Normal University, Taipei, Taiwan.
University of Maryland, Cambridge, USA.
Sci Rep. 2017 Aug 11;7(1):7895. doi: 10.1038/s41598-017-08206-4.
The northward-flowing Kuroshio often intrudes westward and modulates the water masses of the South and East China Seas. These intrusions transcend multiple scales in time and space, which we demonstrate here using various independent data sets. There are two hot spots of intrusion, one in the Luzon Strait and the other off northeast Taiwan, which occur synchronously when the upstream Kuroshio weakens during winter. Beyond seasonal time scales, the two intrusions were not synchronous during 1993-2013. While intrusions into the South China Sea echoed the Pacific Decadal Oscillation, the intrusion northeast of Taiwan decreased markedly before 2002 but regularly reached the shelf thereafter. This change was due to the influence of westward impingements of cyclonic eddies from the open ocean on the Kuroshio main stream in place of anticyclonic eddies. During 1993-2001, decreasing cyclonic eddy impingements moved the Kuroshio away from northeast Taiwan, weakening the Kuroshio intrusion onto the East China Sea shelf. Thereafter, enhanced cyclonic eddy impingement during 2002-2013 weakened the Kuroshio transport, moving it closer to the shelf and enhancing its intrusion into the East China Sea.
北流的黑潮经常向西侵入，并调节南海和东海的水体。这些侵入跨越了时间和空间的多个尺度，我们使用各种独立的数据集在这里展示了这一点。有两个侵入热点，一个在吕宋海峡，另一个在台湾东北，当冬季上游黑潮减弱时，它们会同时发生。在季节性时间尺度之外，1993-2013 年期间，这两个侵入并不同步。虽然南海的侵入与太平洋年代际振荡相呼应，但台湾东北的侵入在 2002 年前明显减少，但此后经常到达陆架。这种变化是由于来自开阔海洋的气旋性涡向西撞击黑潮主流，取代了反气旋性涡，从而对黑潮产生了影响。在 1993-2001 年期间，减少的气旋性涡撞击使黑潮远离台湾东北，从而减弱了黑潮对东海陆架的侵入。此后，2002-2013 年期间气旋性涡撞击的增强减弱了黑潮的输运，使其更接近陆架，并增强了其对东海的侵入。
