Lowered ADCP current measurements during RV MARIA S. MERIAN cruise MSM107@en

Ocean velocity profiles were collected using an ADCP (300 kHz Teledyne RD Instruments Workhorse Sentinel ADCP) mounted on the CTD-Rosette during the Maria S. Merian cruise MSM107. During CTD-Rosette casts, the Lowered Acoustic Doppler Current Profiler (LADCP) collected full-depth profiles of velocities and echo intensity under the CTD frame over a 110.17 m profile with 27 bins of 4 m. The short profiles were combined into a record of full-depth absolute (i.e. in the Earth's frame of reference) velocities using the LDEO Software provided by A.M. Thurnherr (https://www.ldeo.columbia.edu/~ant/LADCP.html) and the CTD data (to know the vertical velocity of the LADCP frame and accurately calculate sound velocity throughout the water column), the ship position (to correct for horizontal movements) and the data from a ship mounted ADCP (to better constrain LADCP data close to the surface). A total of 16 profiles were collected. The processed ADCP data show the water velocity magnitude and direction over the whole water column every 4 m.本数据集的海洋流速剖面数据，由搭载于温盐深采水系统（CTD-Rosette）的声学多普勒流速剖面仪（Acoustic Doppler Current Profiler，ADCP，型号为300 kHz Teledyne RD Instruments Workhorse Sentinel ADCP）在Maria S. Merian号科考航次MSM107中采集。在CTD-Rosette投放作业过程中，下放式声学多普勒流速剖面仪（Lowered Acoustic Doppler Current Profiler，LADCP）于CTD框架下方采集了全水深流速与回声强度剖面，该剖面覆盖水深110.17 m，包含27个间距为4 m的测量单元。研究人员借助A.M. Thurnherr提供的LDEO软件（https://www.ldeo.columbia.edu/~ant/LADCP.html），结合CTD数据（用于获取LADCP框架的垂向运动速度，精准计算整层水体的声速）、船舶位置数据（用于校正船体水平运动带来的误差）以及船载ADCP数据（用于优化近表层LADCP数据的约束精度），将单组短剖面整合为全水深绝对流速（即地球参考系下的流速）记录。本航次共采集得到16组流速剖面数据。经处理后的ADCP数据可输出全水柱内每4 m间隔处的水流流速大小与方向信息。