RV Investigator Voyage IN2017_V02 EM122 Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2017_V02, 'SOTS: Southern Ocean Time Series automated moorings for climate and carbon cycle studies southwest of Tasmania' which departed Hobart on the 17 March 2017 and returned to Hobart on the 28 March 2017.

The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry, backscatter information in the southern ocean

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 163 files totalling 3.8 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 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.

本记录所描述的，为“探索者”号科考船（RV Investigator）IN2017_V02航次采集的多波束测深声呐（multibeam echosounder）数据。该航次主题为"SOTS：塔斯马尼亚岛西南海域用于气候与碳循环研究的南大洋时间序列自动锚系系统"，于2017年3月17日从霍巴特起航，2017年3月28日返回霍巴特。

本航次采用Kongsberg EM122型多波束测深声呐，采集南大洋的海底测深（seafloor bathymetry）与后向散射（backscatter）数据。

该EM122声呐的角分辨率为1°×1°，标称工作频率为12 kHz。

本数据集的原始数据中，海底测深与后向散射数据存储为*.all原始格式，水柱后向散射（watercolumn backscatter）数据存储为*.wcd格式，数据存放于澳大利亚联邦科学与工业研究组织（CSIRO）。本数据集共计163个文件，总原始数据量达3.8 GB。

数据采集阶段已对该数据集施加声速剖面校正。*.all格式存储的水深数据已完成运动校正与位置校正。

处理后的数据已施加潮汐校正，并完成异常值剔除。处理后的测线数据以*.gsf格式与ASCII格式提供，处理后的海底测深与后向散射网格数据采用GeoTIFF格式存储。

有关本数据集的更多信息（包括处理流程）收录于GSM数据采集与处理报告中。可根据申请提供额外的数据产品。