Distance between ROV and sea ice from ROV survey PS122/2_25-104 on 2020-02-22, survey 1

The distance between a remotely operated vehicle (ROV) and the sea-ice underside was measured by a single-beam upward-looking acoustic sonar altimeter (Tritech PA500) attached to the ROV during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition between November 2019 and September 2020. Sea-ice draft was derived by subtracting the distance to the sea-ice underside from the ROV depth, uncorrected for ROV attitude (pitch, roll). An offset between the depth reference (ROV bumper bars) and the altimeter of 0.105 m is accounted for in the presented data.在2019年11月至2020年9月的北极气候研究多学科漂流观测站（Multidisciplinary drifting Observatory for the Study of Arctic Climate, MOSAiC）考察任务期间，安装于遥控水下机器人（remotely operated vehicle, ROV）的单波束向上声学声呐高度计（Tritech PA500），对遥控水下机器人与海冰下表面之间的距离进行了测量。本研究通过遥控水下机器人的水深值减去其与海冰下表面的距离，计算得到海冰吃水深度，该计算过程未针对遥控水下机器人的姿态（俯仰、横滚）进行校正。本次公布的数据中，已计入以遥控水下机器人防撞缓冲杆为深度参考基准与声呐高度计之间的0.105米偏移量。