Mixing processes on the ecosystem of the Izu ridge

为了研究黑潮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。我们开发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。我们还使用了拖曳式水文测量仪器Aquashuttle来绘制上层海洋的水文地图。在拨款期间，我们研究了三个岛屿。第一个是大岛，它位于伊豆脊的北端。黑潮在这个岛周围延伸了水流的分支。我们确定了三种不同的水文模式：东流、西流和无分支效应。3个病例都有一个共同的特征，即岛的东部比东部叶绿素含量高。我们调查了mikura岛作为第二个调查点。青岛岛是第三个…更多的调查岛。这两个岛都位于伊豆脊的南端，黑潮直接袭击了该岛。1999年10月，我们测量了Mikura-island的水文，并投放了一些TurboMAP剖面。不幸的是，在这次实验中，TurboMAP设计的绞车不适合这种类型的公海作业，我们没有足够的信息来获得混合事件的全局图像。2000年10月，我们改进了TurboMAP的绞车系统和电缆。在这个实验期间，黑潮直接袭击了青岛县。尽管天气恶劣，我们还是成功地测量了岛后的微观结构。为了进一步了解混合与浮游生态系统之间的耦合关系，首席研究员（HI）与许多来自北美的人进行了合作。HI与伍兹霍尔海洋研究所的合作者利用视频系统研究了湍流与浮游生物之间的相互作用。该中心还与维多利亚大学和加拿大海洋科学研究所的合作者共同研究了小尺度物理过程与浮游生物的耦合问题。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