Hydroacoustic backscatter recorded by buoy 2020AZFP1 in the central Arctic Ocean during Sep 2020 - May 2021

This dataset contains hydroacoustic measurements collected by an autonomous ice-tethered bio-physical observatory during its drift across the Central Arctic Ocean from the end of MOSAiC in September 2020 to the next spring in May 2021. The measurements were performed by an Acoustic Zooplankton and Fish Profiler (AZFP, ASL) with factory calibrations. Data are provided as volume backscatter (Sv, in dB re 1 m⁻¹). We provide data for the frequencies 67, 125, 200 and 455 kHz. These files contain the quality-controlled raw data. The data were cleaned, processed and analysed in the paper Sea-ice decline makes zooplankton stay deeper for longer by Flores, Veyssiere et al. (submitted to Nature Cliimate Change), which contains a detailed description of the instrument and the measurement settings. The format can be readily ingested in the hydroacoustic data processing application EchoView.本数据集收录了自主系泊冰基生物物理观测站在漂流横跨北冰洋中部海域期间采集的水声测量数据，观测周期为2020年9月MOSAiC计划结束后至2021年5月的次年春季。本次测量由声学浮游动物与鱼类剖面仪（Acoustic Zooplankton and Fish Profiler，简称AZFP，ASL）完成，该仪器已完成工厂校准。数据以体积反向散射系数（Sv，单位为dB re 1 m⁻¹）的形式提供，涵盖67、125、200及455 kHz四个频段。本数据集文件均包含经过质量控制的原始观测数据。相关数据清洗、处理与分析工作已在Flores、Veyssiere等人提交至《自然·气候变化》（Nature Climate Change）的论文《海冰消退导致浮游动物停留深度更深、时长更长》中完成，该论文对观测仪器与测量设置进行了详细说明。该数据格式可直接被水声数据处理软件EchoView导入使用。