Mixing processes on the ecosystem of the Izu ridge

为了研究黑潮引起的孤岛混合对浮游生态系统的影响，我们在伊豆海脊进行了一系列的野外观测。我们研制了一种新的微结构自由落体剖面仪--湍流-海洋微结构采集剖面仪(TurboMAP)，可以同时测量湍流和叶绿素场。我们还使用了一种名为Aquashuttle的拖曳水文仪，绘制了上层海洋的水文图。在赠款期间，我们研究了三个岛屿。第一个是位于伊豆山脊北端的大岛。黑潮将这座岛屿周围的水流分支延伸开来。我们确定了三种不同的水文类型：东向流、西向流和无分支效应。这三个病例都有一个共同的特征，即岛屿东部的叶绿素水平高于东部。我们调查了三库拉岛作为第二个调查地点。青冈市是…投资的第三家公司更多的提格岛。这两个岛屿都位于伊豆海脊的南端，黑潮直接袭击了该岛。1999年10月，我们对三库拉岛进行了水文测量，并丢弃了几个TurboMAP剖面。不幸的是，TurboMAP在这次实验中设计的绞车不适合这种类型的远洋作业，我们没有足够的信息来获得混合事件的全球图像。2000年10月，我们对TurboMAP的绞车系统和缆绳进行了改进，在试验期间，黑潮直接冲击了青岛县。虽然天气不太好，但我们成功地在岛后进行了微结构测量。为了了解混合和浮游生态系统之间耦合的程度，首席调查员(HI)与来自北美的许多人合作。HI与伍兹霍尔海洋研究所的合作者使用视频系统研究了湍流和浮游生物之间的相互作用。HI还与维多利亚大学和加拿大海洋科学研究所的合作者一起审查了小规模物理过程和浮游生物的耦合问题。较少

We have conducted a series of field observations along the Izu ridge in order to investigate the role of mixing induced from an isolated island due to Kuroshio on the planktonic ecosystem. We have developed a new microstructure free fall profiler, Turbulence-ocean Microstructure Acquisition Profiler (TurboMAP), to measure both turbulence and chlorophyll field simultaneously. We also used a towed hydrographic instrument, Aquashuttle, to map the hydrography of the upper ocean. We studied three islands during the grant period. The first is Oshima, which locates at the northern end of the Izu ridge. Kuroshio extends the branches of the flow around this island. We have identified three distinguished hydrographic patterns : eastward stream, westward stream and no branch effect. All three cases had a common feature being the eastern part of the island showed higher chlorophyll level than the eastern part.We surveyed Mikura-island as the second investigation site. Aoga-shima is the third inves … More tigation island. Both island locate the southern end of the Izu ridge and Kuroshio hits the island directly. In October 1999, we measured the hydrography of Mikura-island and dropped a few TurboMAP profiles. Unfortunately, the winch designed of TurboMAP during this experiment was not suited for this type of open ocean operation, we did not have sufficient information to get the global picture of the mixing event. In October 2000, we improved the winch system and the cable for TurboMAP.During this experimental period Kuroshio directly hit Aoga-shima. Although the weather was hash, we made successful microstructure measurements behind the island.In order to the level of understanding on the coupling between mixing and planktonic ecosystem, the head investigator (HI) has collaborating with numerous people from the north America. The HI studied the interaction between turbulence and planktonic organisms using a video system with collaborators from Woods Hole oceanographic institution. The HI also review the coupling problems for small scale physical processes and planktonic organism with collaborators from University of Victoria and Institute of Ocean Science of Canada. Less