nc file: ADCP current measurements (75 kHz) during RV MARIA S. MERIAN cruise MSM102

Upper-ocean velocities along the cruise track of RV MARIA S. MERIAN cruise MSM102 were continuously collected by a vessel-mounted Teledyne RD Instruments 75 kHz Ocean Surveyor ADCP. The transducer was located at 6.0 m below the water line. The instrument was operated in narrowband mode with 8 m bins and a blanking distance of 8 m, while 100 bins were recorded using a pulse of 1.43 s. The ship's velocity was calculated from position fixes obtained by the Global Positioning System (GPS). Heading, pitch and roll data from the ship's gyro platforms and the navigation data were used by the data acquisition software VmDas internally to convert ADCP velocities into earth coordinates. Accuracy of the ADCP velocities mainly depends on the quality of the position fixes and the ship's heading data. Further errors stem from a misalignment of the transducer with the ship's centerline. Data post-processing included water track calibration of the misalignment angle (0.76° +/- 0.4377°) and scale factor (1.0017 +/- 0.0091) of the Ocean Surveyor signal. The average interval was set to 120 s.

RV MARIA S. MERIAN号科考船MSM102航次期间，沿航迹的上层海洋流速由船载Teledyne RD Instruments 75 kHz Ocean Surveyor ADCP连续采集。换能器位于吃水线以下6.0米处。该仪器以窄带模式运行，采用8米深度单元和8米盲区距离，使用1.43秒的脉冲记录100个深度单元。船舶速度由全球定位系统（GPS）获取的定位数据计算得出。船舶陀螺平台提供的航向、纵倾和横倾数据，以及导航数据，由数据采集软件VmDas内部用于将ADCP流速转换为大地坐标系下的流速。ADCP流速的精度主要取决于定位数据的质量和船舶航向数据。其他误差来源于换能器与船舶中心线的对准偏差。数据后处理包括对Ocean Surveyor信号的对准偏差角（0.76° ± 0.4377°）和比例因子（1.0017 ± 0.0091）进行水路校准。平均采样间隔设置为120秒。