Polarstern PS117 expedition Remotely Operated Vehicle (ROV) under-ice observations

During RV Polarstern voyage PS117, under-ice observations were conducted with an instrumented Remotely Operated Vehicle (ROV) deployed directly from the ship. Collected time-stamped datastreams from the instrumented ROV include: ROV navigation data (heading, pitch, roll, position from an acoustic transponder system), under-ice video footage from the ROV camera and additional upward-looking video cameras, data from an upward-looking acoustic altimeter with integrated depth sensor (to measure the distance of the ROV to the sea-ice subsurface), under-ice hyperspectral irradiance and radiance data from two upward-looking radiometers, and time-stamped up-ward looking digital stills images to detect and quantify the abundance of herbivores at the ice-water interface.Methods for data collection are broadly consistent with methods described in detail in the referenced publication.

在极星号（RV Polarstern）科考航次PS117期间，研究团队借助直接从母船布放的搭载多类传感器的遥控无人潜水器（Remotely Operated Vehicle, ROV）开展了冰下观测作业。该搭载传感器的ROV所采集的带时间戳数据流涵盖以下内容：ROV导航数据（含航向、俯仰角、横滚角，以及声学应答器系统获取的位置信息）、ROV搭载相机与额外向上观测摄像头拍摄的冰下视频素材、集成深度传感器的向上观测声学高度计数据（用于测量ROV与海冰下表面的距离）、两台向上观测辐射计获取的冰下高光谱辐照度与辐亮度数据，以及带时间戳的向上观测静态数字图像——后者用于探测并量化冰水界面处植食性生物的丰度。本次数据采集方法与已发表参考文献中详细记载的方法大体一致。