RV Investigator Voyage IN2022_V02 EM122 Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2022_V02, titled "Sedimentation at its extreme: how powerful are submarine caldera-forming eruptions (Kermadec arc)?" The voyage took place between March 15, 2022 and April 19, 2022 (AEST), departing from Hobart and returning to Hobart. The main area of survey was the Kermadec arc off of northern New Zealand.The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry, backscatter information and watercolumn backscatter between Hobart and New Zealand and the survey areas within the Kermadec Arc region.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 755 *.all files totaling 49.9 GB of raw bathymetry/backscatter data and 754 *.wcd files totaling 65.6GB of watercolumn 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.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“探索者”号（RV Investigator）科考航次IN2022_V02所采集的多波束测深数据（multibeam echosounder），该航次的研究主题为“极端沉积作用：海底破火山口喷发的威力几何？（克马德克弧（Kermadec arc）海域）”。本次航次于2022年3月15日至2022年4月19日（澳大利亚东部标准时间，AEST）执行，从霍巴特启航并返回霍巴特。本次调查的核心区域为新西兰北部海域的克马德克弧。
本航次采用康斯伯格（Kongsberg）EM122型多波束测深仪，采集了霍巴特至新西兰航线以及克马德克弧调查区内的海底地形（水深）数据、反向散射信息与水体柱反向散射数据。该设备的角分辨率为1°×1°，标称工作频率为12 kHz。
所有数据存储于澳大利亚联邦科学与工业研究组织（CSIRO），其中水深与反向散射原始数据采用*.all格式存储，水体柱反向散射数据采用*.wcd格式存储。本数据集包含755个*.all格式文件，总原始水深/反向散射数据量达49.9 GB；754个*.wcd格式文件，总水体柱数据量达65.6 GB。
数据采集阶段已对数据应用声速剖面校正。*.all格式存储的原始水深数据已完成运动与位置校正。采用EGM2008地球重力场模型解算GPS潮汐校正量，并应用于预处理后的数据。预处理完成后，已对数据进行异常值剔除操作。
处理后的测线数据可获取*.gsf格式与ASCII格式文件，处理后的水深与反向散射网格数据采用GeoTIFF格式存储。
本数据集的更多相关信息（包括处理流程细节）收录于《GSM数据采集与处理报告》。额外数据产品可根据申请提供。