RV Investigator Voyage IN2025_V02 EM712 Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2025_V02, ' SOTS: Southern Ocean Time Series automated moorings for climate and carbon cycle studies southwest of Tasmania ' which departed Hobart on the 26th March and returned to Hobart on the 14th April 2025.The Kongsberg EM712 multibeam echosounder was used to acquire seafloor bathymetry and backscatter information and watercolumn backscatter.The EM712 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 *.kmall raw format for bathymetry and backscatter and *.kmwcd format for watercolumn backscatter at CSIRO. There are 13 files totalling 2.76 GB of raw data and 13 files totalling 11.7 GB of watercolumn data in this dataset. Sound velocity profiles were applied to this data during data acquisition. Bathymetry data contained in *.kmall format are corrected for motion and position. GPS tide was computed using the EGM2008 model and applied to the processed data. Processed data has had outliers removed. Additional information regarding this dataset, including further information on processing streams, is contained in the GSM data acquisition and processing report.

本记录描述了“调查者号”科考船（RV Investigator）IN2025_V02航次采集的多波束回声测深仪数据。该航次名为“SOTS：南大洋时间序列（Southern Ocean Time Series）——塔斯马尼亚西南部气候与碳循环研究自动锚系观测”，于2025年3月26日从霍巴特启航，同年4月14日返回霍巴特。本次观测采用Kongsberg EM712多波束回声测深仪，采集海底地形、反向散射信息及水体反向散射数据。EM712的发射与接收角分辨率分别为0.5°和1°，标称频率范围为40至100千赫兹（kHz）。CSIRO存储的数据中，海底地形与反向散射原始数据采用*.kmall格式，水体反向散射数据采用*.kmwcd格式。本数据集包含13个原始数据文件（总计2.76 GB）和13个水体数据文件（总计11.7 GB）。数据采集过程中已应用声速剖面进行校正；*.kmall格式中的海底地形数据已完成运动与位置校正；采用EGM2008模型计算GPS潮汐，并将其应用于处理后的数据；处理后的数据已剔除异常值。关于本数据集的更多信息（包括处理流程的详细说明），请参见GSM数据采集与处理报告。