METEOR cruise M146 raw data of EM122 multibeam echosounder (bathymetry, beam time series), Tropiquito

Multibeam echosounder (MBES) data recorded during RV METEOR cruise M146 between 17.03.2018 and 16.04.2018. The data covers the transit (cruise started in Receive/Brazil) in international waters crossing the Atlantic Ocean, a single survey line crossing Tropiquito seamount (SW of Tropic seamount) and the main target at Henry seamount, southeast of El Hierro, Canary Islands. The main objective of this cruise was to discover hydrothermal venting sites at Henry Seamount as data acquired during the previous cruise M66/1 showed evidences that there might be active hydrothermal circulation at Henry Seamount. Therefore, the bathymetric surveys conducted with hull-mounted MBES and the MARUM AUV SEAL were accompanied with investigations in the water column, heat flow measurements, TV-sled dives and high-resolution reflection seismic. CI Citation: Paul Wintersteller ([e-mail]) as responsible party for bathymetry and backscatter post-processing and its products. Description of the data source: During the RV METEOR cruise M146 the Kongsberg EM122 multibeam echosounder with a nominal sounding frequency of 11.5 to 12.5 kHz was utilized. 288 beams (and up to 864 soundings in equidistant and dual swath mode) are formed for each ping with a 1°(Tx)/2°(Rx) footprint while the seafloor is detected using amplitude and phase information for each beam sounding. For further information consult https://www.km.kongsberg.com/. The EM122 was recording constantly within the permitted areas, either designated to bathymetry surveys or flare imaging-surveys. In total, three different subsets of hydroacoustic data were acquired: a transatlantic dataset covering the transit in international waters; a second dataset covering the area of Tropiquito Seamount, which is situated about 100 km southwest of Tropico seamount and the main dataset of the area of Henry Seamount, which is located roughly 40 km southeast of El Hierro (Canary Islands). Responsible person during this cruise / PI: Miriam Römer ([e-mail]) & Paul Wintersteller ([e-mail]) Chief Scientist: A. Klügel ([e-mail]) CR: not yet available CSR: not yet available A special thanks goes to the watch keeper during M146: Anna Katharina Bachmann, Rachel Barrett, Philipp Held, Kai Frederik Lenz, Katja Lindhorst, Anne-Christin Melcher, Laura Kramer, Nikolas Stange, Anne Strack.本数据集为“流星号”（RV METEOR）科考船M146航次于2018年3月17日至2018年4月16日期间采集的多波束测深声呐（Multibeam echosounder, MBES）数据。数据覆盖了从巴西接收港出发的跨大西洋公海航行航程、横穿Tropiquito海山（位于Tropic海山西南侧）的单条测量测线，以及位于加那利群岛耶罗岛东南侧约40公里处的亨利海山（Henry Seamount）核心研究区域。本次航次的主要目标是在亨利海山发现热液喷口位点，因此前M66/1航次采集的数据已显示亨利海山存在活跃热液循环的迹象。为此，本次航次采用船载多波束测深声呐与MARUM AUV SEAL开展水深测量，并同步开展了水体调查、热流测量、电视雪橇潜次作业与高分辨率反射地震勘探。数据引用说明：保罗·温特斯特勒（Paul Wintersteller，邮箱：[e-mail]）负责水深与后向散射数据的后处理工作及其成果产出。 数据源说明： 在“流星号”M146航次期间，科考团队使用了标称探测频率为11.5至12.5 kHz的康斯博格（Kongsberg）EM122多波束测深声呐。每次声脉冲可形成288个波束（等距双条带模式下最多可获得864个测深点），波束脚印参数为发射角1°/接收角2°，并通过每个波束测深的振幅与相位信息识别海底。更多技术细节可参考https://www.km.kongsberg.com/。EM122在获批作业区域内持续采集数据，作业区域分为水深测量与耀斑成像测量两类。本次航次共采集三类水声数据子集：其一为覆盖跨大西洋公海航行航程的数据集；其二为覆盖Tropiquito海山区域的数据集，该海山位于Tropic海山西南侧约100公里处；其三为亨利海山区域的核心数据集，该区域位于加那利群岛耶罗岛东南侧约40公里处。本次航次负责人/首席研究员：米里亚姆·勒默（Miriam Römer，邮箱：[e-mail]）与保罗·温特斯特勒（Paul Wintersteller，邮箱：[e-mail]）。首席科学家：A. 克吕格尔（A. Klügel，邮箱：[e-mail]）。CR：暂未提供；CSR：暂未提供。 特别致谢M146航次的值班人员：安娜·凯瑟琳·巴赫曼、雷切尔·巴雷特、菲利普·赫尔德、凯·弗雷德里克·伦茨、卡特亚·林德霍斯特、安妮-克里斯汀·梅尔彻、劳拉·克拉默、尼古拉斯·施坦格、安妮·施特拉克。