Observation of the Sea Surface in Southwest East China Sea by Sensor Network

9.25 MHz海洋雷达连续观测到东海西南部的黑潮、中国海流和附近的其他海流。通过这一观测，明确了黑潮具有两种流型，黑潮与矢山群岛之间的涡旋结构可能是由Yonaguni岛产生的顺时针和逆时针涡流引起的。这些涡旋的空间尺度在30~100公里之间，移动速度在15~30公里/天之间。此外，通过比较石垣岛和与国岛海平面的黑潮流型和海平面变化，明确了石垣岛和与那国岛海平面异常是由黑潮的变化决定的。通过这一观测，阐明了塞基塞寿口及其周围的洋流格局，以及塞基塞寿口与近海(东中国海和太平洋)的相互作用。通过这一观察，明确了大量珊瑚幼虫定居在石垣岛和伊里奥莫特群岛周围的海底。此外，还阐明了一些珊瑚幼体在黑潮和其他附近洋流的作用下定居在宫古岛周围海底的可能性。通过这次观测，微尺度剖面仪观测到了关岛及其周围海表层的垂直微结构。通过这次观测，风或风浪给海面提供的湍流似乎是这种表层垂直混合的原因，因为随着风的吹起，海面层的湍流扩散到10米深。50 cm/S的海面水平平均速度较快。

Kuroshio, where flows in southwest East China Sea, and other nearby currents are continuously observed by 9.25MHz Ocean Radar. By this observation, it is clarified that Kuroshio has two current patterns, and the eddy structure between the Kuroshio and Yaeyama Islands appeals to be caused by the clockwise and counterclockwise eddies caused by Yonaguni Island. The spatial scale of these eddies is between 30 and 100 km, and the traveling speed of these eddies is between 15 and 30 km/day. In addition, it is clarified that the abnormal sea level at Ishigaki and Yonaguni Islands depends on the variation of Kuroshio by comparing the current patterns of Kuroshio with the sea level at these Islands.The sea surface currents in Sekiseishoukou and other nearby currents are observed by 24.515MHz Ocean Radar. By this observation, it is clarified the current pattern in and around Sekiseishoukou and the interaction between Sekiseishoukou and offshore (East China Sea and Pacific Ocean).The transport of coral larval born in Sekiseishoukou is observed by GPS buoy. By this observation, it was clarified that lots of coral larval settle on the sea bottom around Ishigaki and Iriomote Islands. In addition, it was clarified the possibility that some coral larval settle on the sea bottom around Miyako Island by Kuroshio and other nearby currents.The vertical microstructure in the sea surface layer in and around Sekiseishoukou was observed by the Micro-scale profiler By this observation, supply of turbulence to the sea surface due to wind or wind wave seemed to be cause of this vertical mixing in the surface layer, because as wind blew up, turbulence in the sea surface layer spread to 10 m depth. And 50cm/s of horizontal mean velocity in the sea surface was relatively fast.