Near-bottom AUV Sentry raw magnetic data (MATLAB format) from 9°50'N, East Pacific Rise (2021, RR2102)

Near-bottom magnetic data was collected at the East Pacific Rise, from 9°50'N, during a total of 20 AUV Sentry dives conducted from R/V Atlantis and R/V Roger Revelle during 2018 Atlantis cruise AT42-06 (three dives); 2019 Atlantis cruise AT42-21 (ten dives); and, 2021 Revelle cruise RR2102 (seven dives). Track lines were spaced 170 m apart, with Sentry about 70 m above bottom, collecting magnetic data using three Applied Physics Systems Model 1540 triaxial fluxgate magnetometers mounted on AUV Sentry. Sentry navigation was obtained using a 300 kHz Teledyne Doppler velocity log (DVL) and a Sonardyne AvTrak2 ultra-short baseline (USBL) acoustic positioning system, combined with an iXblue Phins inertial navigation system (INS), and a Paroscientific 8B7000-I Digiquartz depth sensor. The three-component magnetic data is in MATLAB binary format, one file per Sentry dive, with z being the observed magnetic field. The MATLAB data structure includes X,Y,Z component fluxgate data for each of three sensors where X,Y,Z are in sensor coordinates. The data structure also contains time, latitude, longitude, depth, altitude, roll, pitch, heading, and temperature. The Sentry dive number is given in the file name. Funding was provided by National Science Foundation awards OCE-1834797, OCE-1949485, OCE-1948936, and OCE-1949938.

本数据集为20次自主水下航行器（Autonomous Underwater Vehicle, AUV）“森特”号（Sentry）下潜所采集的近底磁测数据，采集区域位于东太平洋海隆9°50′N海域。下潜任务由“亚特兰蒂斯号”研究船（R/V Atlantis）与“罗杰·雷维尔号”研究船（R/V Roger Revelle）执行，具体涵盖2018年亚特兰蒂斯号航次AT42-06（3次下潜）、2019年亚特兰蒂斯号航次AT42-21（10次下潜）以及2021年雷维尔号航次RR2102（7次下潜）。测线布设间距为170米，“森特”号作业时距海底约70米，搭载3台应用物理系统公司（Applied Physics Systems）Model 1540型三轴磁通门磁力仪采集磁数据。“森特”号的导航系统通过以下设备实现：300 kHz泰利登（Teledyne）多普勒测速仪（Doppler Velocity Log, DVL）、索纳戴恩（Sonardyne）AvTrak2型超短基线（ultra-short baseline, USBL）声学定位系统，搭配iXblue Phins型惯性导航系统（Inertial Navigation System, INS）以及帕罗斯科学公司（Paroscientific）8B7000-I型Digiquartz深度传感器。本次采集的三分量磁数据采用MATLAB二进制格式存储，每一次下潜对应一个独立数据文件，其中z分量为实测磁场强度。MATLAB数据结构包含三台传感器各自的X、Y、Z分量磁通门数据，其中X、Y、Z为传感器坐标系下的分量。该数据结构同时涵盖时间、纬度、经度、水深、作业高度、横滚角、俯仰角、航向角以及环境温度等参数。数据文件名中包含“森特”号的下潜编号。本数据集的采集工作获得美国国家科学基金会（National Science Foundation, NSF）项目OCE-1834797、OCE-1949485、OCE-1948936及OCE-1949938资助。