RV Investigator Voyage IN2023_V01 EM122 Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2023_V01, titled "Antarctic Bottom Water Production in the past: Records from marine sediments, Cape Darnley, East Antarctica". The voyage took place between 25th January, 2023 and 2nd March, 2023 departing from Henderson's (WA) and arriving in Hobart (TAS).The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry, backscatter information and watercolumn backscatter between Fremantle to Antarctica and Albany to Hobart.The EM122 provides a 1 degree by 1 degree angular resolution. The echosounder's nominal frequency is 12 kHz.Data are stored in *.all raw format for bathymetry and backscatter and *.wcd format for watercolumn backscatter at CSIRO. There are 1,395 files totalling 60 GB of raw data in this dataset.Sound velocity profiles were applied to this data during data acquisition. Bathymetry data contained in *.all format are corrected for motion and position.Bathymetry data contained in *.all format are corrected for motion and position. GPS tide was computed using the EGM2008 model and applied to the processed data. Processed data had outliers removed. Processed line data are available in *.gsf and ascii format, and processed bathymetry and backscatter grids in geotiff format. Additional information regarding this dataset, including information on processing streams, is contained in the GSM data acquisition and processing report. Additional data products may be available on request.

本记录描述了“探索者号”研究船（RV Investigator）航次IN2023_V01采集的多波束测深数据，项目标题为《过去南极底层水形成：东南极丹利角海洋沉积物记录》。该航次于2023年1月25日至2023年3月2日期间执行，从西澳大利亚州亨德森启程，最终抵达塔斯马尼亚州霍巴特。本航次使用康斯伯格EM122多波束测深仪（Kongsberg EM122）采集了弗里曼特尔至南极洲、奥尔巴尼至霍巴特航线的海底地形、反向散射信息以及水体柱反向散射数据。EM122的角分辨率为1°×1°，标称工作频率为12 kHz。该数据集的原始数据存储于澳大利亚联邦科学与工业研究组织（Commonwealth Scientific and Industrial Research Organisation, CSIRO），其中海底地形与反向散射的原始数据采用*.all格式存储，水体柱反向散射原始数据采用*.wcd格式存储。本数据集共计1395个文件，总原始数据量达60 GB。数据采集阶段已针对该数据应用声速剖面校正。*.all格式存储的海底地形数据均已完成运动校正与位置校正。已采用EGM2008模型解算GPS潮汐校正参数，并将其应用于处理后的数据中。处理后的数据已完成异常值剔除。处理后的测线数据以*.gsf格式与ASCII格式提供，处理后的海底地形与反向散射栅格数据采用GeoTIFF格式发布。有关本数据集的更多信息（包括处理流程相关内容）均收录于GSM数据采集与处理报告中。额外数据产品可应申请提供。