RV Investigator Voyage IN2021_V01 EK60/EK80 Echosounder

This record describes scientific split-beam echosounder data collected on the RV Investigator voyage IN2021_V01, "Quantifying krill abundance for krill monitoring and management off the Australian Antarctic Territory", which departed Hobart on the 29th January 2021 and returned to Hobart on the 24th March 2021 (AEST).The Simrad EK80 split beam echosounders 18, 38, 70 120, 200 and 333 kHz were used to acquire acoustic backscatter data to a maximum range of 1500 m between Hobart and near Mawson station, Antarctica. All frequencies were logged continuously for the extent of the voyage. Acquisition settings (pulse length, power) were varied for the transit and survey portions of the voyage according to science requirements. Specific settings for each time period can be obtained from the GSM voyage report. From 1 Feb, 2021 the 18kHz WBT was replaced with the 18kHz GPT which was run for the remainder of the voyage. A calibration was performed at the survey location on 13 Feb 2021.Data are stored in *.raw, *.bot and *.idx format at CSIRO. There are 3192 files totalling 295 GB of raw data in this dataset.No processing has been conducted on this data.Additional information regarding this dataset is contained in the GSM data acquisition and processing report. Additional data products may be available on request.

本记录描述了"RV Investigator"号航次IN2021_V01（航次主题为"量化澳大利亚南极领地周边磷虾丰度以支撑磷虾监测与管理"）中采集的科学用分裂波束回声测深仪（split-beam echosounder）数据。该航次于2021年1月29日从霍巴特启航，2021年3月24日（澳大利亚东部标准时间，AEST）返回霍巴特。本航次使用Simrad EK80型分裂波束回声测深仪（工作频率涵盖18、38、70、120、200及333 kHz）采集声学后向散射数据，采集范围覆盖霍巴特至南极莫森站附近海域，最大探测距离达1500米。全航次全程连续记录所有频率的声学数据。根据科考需求，航次的航行过境与科考作业阶段采用了不同的采集参数（脉冲长度、发射功率）。各时段的具体采集参数可从GSM航次报告中获取。2021年2月1日起，原18kHz宽带发射（WBT）模块被替换为18kHz宽带脉冲发射（GPT）模块，并沿用于航次剩余阶段。2021年2月13日，科考作业海域开展了一次设备校准。本数据集的原始数据以*.raw、*.bot及*.idx格式存储于澳大利亚联邦科学与工业研究组织（CSIRO）。本数据集共包含3192个文件，总容量达295 GB，且未经过任何后期处理。有关本数据集的更多详细信息，请参阅GSM数据采集与处理报告。可按需申请获取额外数据产品。