RV Investigator Voyage IN2021_V02 EM710 MKII Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2021_V02 (SOTS: Southern Ocean Time Series automated moorings for climate and carbon cycle studies southwest of Tasmania), which departed Hobart on the 14th April 2021 and returned to Hobart on the 28th April 2021. The Kongsberg EM710 MKII multibeam echosounder was used to acquire seafloor bathymetry and backscatter information and watercolumn backscatter in water depths less than 1000 m during the voyage (i.e. on the Continental shelf and upper slope region).The EM710 MKII provides a 0.5° by 1° transmit and receive angular resolution respectively. The echosounder's nominal frequency range is from 40 to 100 kHz.Data are stored in *.all raw format for bathymetry and backscatter and *.wcd format for watercolumn backscatter at CSIRO. There are 27 files totalling 4.99 GB of raw bathymetry & backscatter data, and 26 files totalling 51.5 GB of raw 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.The data have been reduced to approximate Mean Sea Level (MSL) using the Earth Gravitation Model 2008 (EGM2008) 1 arc-minute grid. Tide corrections were not 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 further information on processing streams, is contained in the GSM data acquisition and processing report. Additional data products may be available on request.

本记录详述了“探索者号”（RV Investigator）科考航次IN2021_V02所采集的多波束测深仪（multibeam echosounder）数据，该航次的科考目标为‘SOTS：塔斯马尼亚西南部气候与碳循环研究南大洋时间序列自动化锚系系统’。本航次于2021年4月14日从霍巴特起航，同年4月28日返回霍巴特。
本航次使用康斯伯格EM710 MKII多波束测深仪，在水深小于1000米的大陆架与上陆坡区域，采集了海底地形（seafloor bathymetry）、海底后向散射以及水体后向散射数据。其中，EM710 MKII的发射与接收角分辨率分别为0.5°与1°，标称频率范围为40~100 kHz。
本数据集的水深地形与后向散射数据以*.all原始格式存储，水体后向散射数据以*.wcd格式存储，由澳大利亚联邦科学与工业研究组织（CSIRO）归档。本数据集包含27个总容量为4.99 GB的原始水深地形与后向散射数据文件，以及26个总容量为51.5 GB的原始水体后向散射数据文件。
数据采集阶段已应用声速剖面修正。*.all格式存储的水深地形数据已完成运动与位置校正。本数据集采用地球重力模型2008（EGM2008）1弧分网格，将数据归算至近似平均海平面（MSL），但未对处理后数据施加潮汐校正。已处理数据已剔除异常值。
处理后的测线数据以*.gsf与ASCII格式提供，处理后的水深地形与后向散射网格数据以GeoTIFF格式提供。
有关本数据集的更多信息（包括处理流程的详细说明）收录于GSM数据采集与处理报告中。额外的数据产品可按需申请获取。