RV Investigator Voyage IN2018_V08 EM710 MKII Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2018_V08, The Balleny mantle plume: key role in Tasmania-Antarctic breakup?, which departed Hobart on the 27/12/2018 and returned to Hobart on the 10/01/2019. The voyage objectives was to identify/map seamounts of the Balleny seamount chain and dredge volcanic samples from the identified seamounts.

The Kongsberg EM710 MKII multibeam echosounder was used to acquire seafloor bathymetry, backscatter information and watercolumn backscatter in the Tasman Sea.

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 28 files totalling 25.2 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.

Tide corrections were not applied to the processed data. Processed data has 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.

本记录描述了“探索者号”（RV Investigator）航次IN2018_V08采集的多波束测深数据，该航次主题为《巴伦尼地幔柱：塔斯马尼亚与南极分离的关键作用？》，于2018年12月27日从霍巴特起航，2019年1月10日返回霍巴特。本航次的科学目标为识别并测绘巴伦尼海山链的海山，以及从已识别的海山处拖采火山样品。

本航次使用康士伯（Kongsberg）EM710 MKII多波束测深仪，在塔斯曼海采集了海底地形测深（水深）数据、反向散射信息以及水体柱反向散射数据。

EM710 MKII的发射角分辨率与接收角分辨率分别为0.5°与1°。该测深仪的标称工作频率范围为40 kHz至100 kHz。

本数据集的水深与反向散射原始数据以*.all格式存储，水体柱反向散射原始数据以*.wcd格式存储于澳大利亚联邦科学与工业研究组织（CSIRO）。本数据集共计包含28个文件，总原始数据量达25.2 GB。

数据采集阶段已应用声速剖面校正。*.all格式存储的水深数据已完成运动校正与位置校正。

处理后的数据未施加潮汐校正，但已剔除异常值。处理后的测线数据以*.gsf与ASCII格式提供，处理后的水深与反向散射网格数据以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）均收录于GSM数据采集与处理报告中。额外的数据产品可根据申请提供。