Eddy-covariance 3D current and temperature under drifting pack ice in central Arctic
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Three-dimensional oceanic currents and temperature of seawater were collected using the eddy-covariance techniques at nine ice stations during 'ArcWatch-1' expedition of RV Polarstern. The two devices of three-dimensional current meter and accurate temperature probe were physically linked by a cable to facilitate the power supply and the synchronized acquisition of distinct variables. For 3D current measurement, we utilized a 600 MHz Vector manufactured by Nortek. For seawater temperature, we employed a RINKO-EC ARO-EC-CM by JFE Advantech Co. The transducer of the current meter was positioned approximately 0.5 to 0.8 m beneath the bottom surface of the ice floe. The spearhead of the RINKO-EC sensor was positioned within 10 mm from the lateral boundary of the sampling volume (diameter = 14 mm; height = 14 mm), located about 157 mm from the central transmitter, inserted at an angle of 45 degrees from below relative to the vertical axis of the water current measurement by Vector. The data sampling was performed at a rate of 8 Hz during the 256-s burst intervals. The ECS collected 2048 data samples per burst that occurred every 10 minutes. The current velocities (u,v,w) were measured in the instrument-fixed Cartesian coordinate (x, y, z), where a positive z denotes an upward direction.
本数据集基于极星号（RV Polarstern）科考船‘ArcWatch-1’航次，在9个冰站采用涡动协方差技术（eddy-covariance techniques）采集了三维海流与海水温度数据。三维海流计与高精度温度探头两套设备通过电缆物理连接，以保障供电与多变量同步采集。三维海流测量采用诺泰克（Nortek）生产的600 MHz Vector型设备；海水温度测量则使用JFE Advantech公司出品的RINKO-EC ARO-EC-CM型传感器。海流计的换能器安装于浮冰冰底下方约0.5至0.8米处。RINKO-EC传感器的探头尖端位于采样区域（直径=14 mm；高度=14 mm）的侧向边界10 mm范围内，该采样区域距中央发射器约157 mm；传感器以与Vector型海流测量垂直轴成45度角的仰角自下方插入。数据采样在256秒的突发采集时段内以8 Hz的速率执行，每10分钟触发一次突发采集，ECS每次突发采集可获取2048个数据样本。海流流速（u、v、w）以仪器固定笛卡尔坐标系（x、y、z）进行测量，其中z轴正方向为向上。
