Koordinatorantrag zur METEOR-Reise 75

留尼汪岛热点的设置非常有利于研究深部地幔热柱的作用机制和这种大洋火山系统的演化。由于侧翼的不稳定和侵蚀，火山建筑物的拆除现在被认为是其长期演化的一个主要组成部分。它在很大程度上有助于建造这些岛屿的海底斜坡。Eroder是基于详细的地球物理调查(条带测深和后向散射数据、重力。委员会还注意到，在建筑物的上部使用高分辨率的直接或间接观测工具(例如，侧扫声纳-合成孔径雷达)，以及对该岛海底部分的精确目标使用直接或间接的高分辨率观测工具(如3.5千赫的沉积物穿透仪)。拟议的工作是多学科的，在沉积和火山构造方面都很有趣，以明确该岛潜艇侧翼的演变过程，并建立与空中结构和过程的关系。2003年11月进行了第一次部署，2005年2月和2006年3月对系泊设备进行了维修。2008年1月邮轮的第一个目的是在检索数据和维修仪器后恢复和重新部署莫桑比克海峡的系泊设施。第二个目的是获得水文观测和海底样本(通过多岩心钻探)，沿系泊设备布置的区段。在水文测量期间采用的观测方法将是放下带有101采样器的CTD和玫瑰花环采样器，以及确定垂直流速剖面的LADCP仪器。船载ADCP将被用来确定航线上的表层(0-500米)速度结构，而温度盐度计将监测海面盐度和温度。这项研究是荷兰对国际气候变异性(CLIVAR)计划的一部分，该计划是世界气候研究计划(WCRP)的一部分。

La Reunion hotspot setting is highly favourable to study mechanisms involved in the functioning of a deep mantle plume and in the evolution of such an oceanic volcanic system. Dismantling of volcanic edifices due to flank destabilizations and erosion is now recognized as a major component of their long-term evolution. It largely contributes to the construction of submarine slopes of such islands. However, these mechanisms remain largely unknown, hi the case of La Reunion, the aim of the proposed cruise ERODER is to better understand, and to quantify, the processes and the dynamics of the transfer of sediments and epiclastic materials on the submarine slopes of a large intraplate oceanic volcanic system, and to evaluate their importance in the present and past evolution of the volcanic edifice itself. ERODER is based on a detailed geophysical survey (swath bathymetry and backscatter data, gravity. 3.5-Khz sediment penetrator) of the upper part of the edifice and on the use of direct or indirect high resolution observation tools (e.g., side scan sonar - SAR) on precise targets of the submarine part of the island. The proposed work is multidisciplinary, interesting both sedimentary and volcano-structural aspects, in order to specify the processes of the evolution of the submarine flanks of the island and to establish the relationships with the subaerial structures and processes. M75/1B: In order to obtain detailed observations on the year to year variability of the flow in and through the Mozambique Channel an array of moorings with current meters (and one sediment trap) has been deployed at the narrowest section of the Channel for a period of at least 5 years. The first deployment was done in November 2003 and servicing of the moorings has been done in February 2005 and March 2006. The first purpose of the cruise in January 2008 is to recover and redeploy the moorings in the Mozambique Channel after the data have been retrieved and the instruments have been serviced. The second purpose is to obtain hydrographic observations and samples of the seafloor (from multi-coring) along the section where the moorings are deployed. The observational methods to be applied during the hydrographic survey will be the lowering of a CTD and rosette sampler with 101 sampler, as well as an LADCP instrument to determine the vertical velocity profile. A ship-mounted ADCP will be used to determine the surface (0-500m) velocity structure en route, while a thermo-salinograph will monitor the sea surface salinity and temperature. The research is part of the Dutch contribution to the international CLIVAR (CLImate VARiability) programme which is part of the WCRP (World Climate Research Program).