RV Investigator Voyage IN2019_V01 EM122 Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2019_V01, The availability of Antarctic krill to large predators and their role in biogeochemical recycling in the Southern Ocean which departed Hobart on the 19th January, 2019 and returned to Hobart on the 5th of March, 2019.

The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry, backscatter information and watercolumn backscatter between Hobart and Antarctica.

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 965 files totalling 51.9 GB of raw bathymetry/backscatter data and 943 files totalling 106 GB of raw water column 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 had outliers removed. Processed line data are available in *.gsf and ascii format, and processed bathymetry 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.

本记录记述了“探索者号”（RV Investigator）科考船IN2019_V01航次采集的多波束测深仪数据；该航次旨在研究南大洋中南极磷虾对大型捕食者的可获得性及其在生物地球化学循环中的作用，航次于2019年1月19日从霍巴特起航，2019年3月5日返回霍巴特。

本航次使用康斯伯格EM122（Kongsberg EM122）多波束测深仪，采集了霍巴特至南极洲之间海域的海底地形测深数据、反向散射信息与水柱反向散射数据。

该测深仪的角分辨率为1°×1°，标称工作频率为12 kHz。

数据由澳大利亚联邦科学与工业研究组织（Commonwealth Scientific and Industrial Research Organisation, CSIRO）存储：其中测深与反向散射数据采用"*.all"原始格式，水柱反向散射数据采用"*.wcd"格式。本数据集包含965个文件，总计51.9 GB的原始测深/反向散射数据；另有943个文件，总计106 GB的原始水柱数据。

数据采集阶段已对该数据集应用声速剖面校正；"*.all"格式包含的测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。处理后的测线数据可获取为"*.gsf"格式与ASCII格式，处理后的测深数据则采用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》中。其他数据产品可根据申请提供。