Mixing processes on the ecosystem of the Izu ridge

为了探讨黑潮孤岛引起的混合作用对黑潮生态系统的影响，我们在伊豆洋脊进行了沿着的一系列观测。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），同时测量湍流和叶绿素场。我们还使用了拖曳式水文仪器Aquashuttle来绘制上层海洋的水文图。我们在赠款期间研究了三个岛屿。第一个是大岛，它位于伊豆山脊的北方末端。黑潮使本岛周围的支流延伸。我们识别出三种不同的水文模式：向东流、向西流和无分支效应。这三个案例都有一个共同的特点，即岛屿的东部比东部显示出更高的叶绿素水平。青岛是第三个投资 ...更多信息 提刑岛这两个岛屿都位于伊豆海脊的南端，黑潮直接袭击该岛。1999年10月，我们测量了三仓岛的水文，并投下了几个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公海操作，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的绞车系统和缆绳。在这次实验期间，黑潮直接击中了青岛。虽然天气很糟糕，但我们成功地在岛后面进行了微观结构测量。为了了解混合与非稳态生态系统之间的耦合，首席研究员（HI）与来自北美的许多人合作。HI与来自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。海洋研究所还与维多利亚大学和加拿大海洋科学研究所的合作者讨论了小尺度物理过程和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