Water column raw data (Kongsberg EM 122 entire dataset) of RV SONNE during cruise SO308/1

Raw multibeam bathymetry data were collected aboard RV SONNE during cruise SO308 (GEOTRACES SIO) using a 12kHz Kongsberg EM 122 multibeam echosounder with 2x2 beam width. The expedition took place during 2024-10-31 – 2024-12-22 from Durban (South Africa) to Fremantle (Australia) in the South Indian Ocean. The main scientific aim of the cruise was to establish the distributions of trace elements and their isotopes (TEIs), quantify their sources from the four major ocean boundaries (rivers, atmosphere, exchange with sediments, ocean crust), and determine their biogeochemical cycling and relationships to large scale ocean circulation along a cruise track in the South Indian Ocean. Data were recorded in the EEZs of Mozambique, Europa Island (France), Bassas da India (France) and outside EEZs. Sound velocity profiles (SVP) were applied on the data for calibration. Please see environmental data and the cruise report for details. The data are unprocessed and can therefore contain incorrect depth measurements (artifacts) if not further processed. Note that refraction errors may occur when no proper SVP is applied. Data acquisition was done by GEOMAR Helmholtz Centre for Ocean Research, provision of the data is supported by the DAM Underway Project and published according to the FAIR principles.

原始多波束测深数据由SONNE号考察船（RV SONNE）在SO308航次（GEOTRACES SIO）期间采集，使用的是12kHz频率的Kongsberg EM 122多波束回声测深仪，其波束宽度为2×2。该航次于2024年10月31日至2024年12月22日期间在南印度洋开展，航程从南非德班至澳大利亚弗里曼特尔。该航次的主要科学目标是明确南印度洋航迹沿线痕量元素及其同位素（TEIs）的分布特征，量化其来自四大海洋边界（河流、大气、与沉积物的交换、洋壳）的来源，并确定其生物地球化学循环规律及其与大规模海洋环流的关系。数据采集区域包括莫桑比克、欧罗巴岛（法国）、印度礁（法国）的专属经济区（EEZ）及专属经济区以外的海域。声速剖面（SVP）已应用于数据校准。详细信息请参见环境数据及航次报告。该数据未经处理，因此若不进一步加工，可能包含不准确的深度测量值（伪影）。请注意，若未应用合适的声速剖面（SVP），可能会产生折射误差。数据采集由GEOMAR亥姆霍兹海洋研究中心完成，数据提供得到DAM Underway项目支持，并依据FAIR原则（FAIR principles）发布。