Krill Observational Mooring for Benthic Investigations (KOMBI) seafloor mooring datasets

This dataset contains all data collected from Krill Observational Mooring for Benthic Investigations (KOMBI) seafloor lander platforms and Mooring for Epipelagic Echo-sounding of Krill (MEEK) platforms. KOMBI platforms were left on the seafloor for one year at depths on the continental shelf and near the shelf break. MEEK moorings are tethered by a mooring string in deeper water, with the top float at approximately 400m depth. The minimum depth of a mooring is 350m to avoid collision with icebergs and the maximum depth is 1500m. KOMBI dimensions are 1145 x 1145 x 1300 mm. Moorings are typically deployed in summer months from vessels and are left to collect data for one year (at least).Active acoustic (ADCP and echosounder) data, passive acoustic data, CTD data and video camera footage are available from various instruments installed on the moorings. Active acoustic deployment files, compass calibrations and echosounder calibration files are included. Echosounders were calibrated in a 10,000L tank of temperature-controlled seawater at the Australian Antarctic Division in Kingston, using a 23mm tungsten carbide sphere and a paired Simrad EK80 333kHz echosounder to map the beam. Calibration raw data and code is included to produce Nortek SONAR equation CalibrationOffsetSv for each frequency. Calibration is only available for narrowband frequencies. Data collection began in 2021 and is ongoing.

本数据集涵盖所有从底栖调查磷虾观测海底着陆器平台（Krill Observational Mooring for Benthic Investigations, KOMBI）与近表层回声探测磷虾锚碇平台（Mooring for Epipelagic Echo-sounding of Krill, MEEK）采集得到的观测数据。KOMBI平台被布放于大陆架及陆架坡折附近的海底区域，单次布设时长为一年。MEEK锚碇系统通过锚泊缆绳系固于深水区，其顶部浮标布设深度约为400米。锚碇系统的最小布设水深为350米，以规避与冰山碰撞风险，最大布设水深为1500米。KOMBI平台的外形尺寸为1145×1145×1300毫米。锚碇系统通常于夏季由科考船舶布放，且会持续采集数据至少一年。锚碇平台搭载的多款仪器可产出主动声学数据（声学多普勒流速剖面仪（Acoustic Doppler Current Profiler, ADCP）与回声测深仪采集的数据）、被动声学数据、温盐深仪（Conductivity, Temperature, Depth, CTD）数据以及摄像机影像资料。本数据集同时包含主动声学部署文件、罗盘校准文件与回声测深仪校准文件。回声测深仪的校准工作于位于澳大利亚金斯顿的澳大利亚南极局（Australian Antarctic Division）实验室中完成，校准介质为10000升控温海水，采用23毫米碳化钨球与配对的Simrad EK80 333kHz回声测深仪完成波束测绘。数据集附带校准原始数据与配套代码，可针对各工作频率生成Nortek声呐方程校准偏移Sv值（Nortek SONAR equation CalibrationOffsetSv）。该校准仅适用于窄带频率。本数据集的采集工作始于2021年，目前仍在持续进行中。