Array of Ocean Bottom Tilt Current Meters: data from the EMSO-Azores observatory, 2017-2018

This dataset contains current data acquired between July 2017 and August 2018 using 3 TCM3 Ocean Bottom Tilt Current Meters installed next to the Tour Eiffel, Montségur and Crystal hydrothermal vent sites.
The TCM-3 Ocean Bottom Tilt Current Meter from Lowell Instruments LLC (North Falmouth, MA, USA) measures current using the drag-tilt principle. The logger is buoyant and is anchored to the bottom via a short flexible tether. Drag from moving water tilts the logger in the direction of flow. The logger’s accelerometer and magnetometer channels are used to record the amount of tilt and direction of tilt (compass bearing). The array comprises 3 currentmeters, deployed near the Tour Eiffel, Montségur and Crystal hydrothermal vent sites. It is not connected to an energy node. The currentmeter's internal clocks are set to UTC time before deployment. Clock drift after recovery is not implemented in data but added as metadata in Table_TCM3EMSO_Azores 2016-2018.

本数据集包含2017年7月至2018年8月期间采集的海流数据，所用设备为3台TCM3型海底倾斜海流计（TCM3 Ocean Bottom Tilt Current Meters），部署于埃菲尔（Tour Eiffel）、蒙塞居尔（Montségur）与克里斯塔尔（Crystal）热液喷口附近。
该TCM-3型海底倾斜海流计由美国马萨诸塞州北法尔茅斯的Lowell Instruments LLC公司制造，采用拖曳倾斜原理开展海流测量。该记录器为浮式结构，通过短柔性系绳锚固于海底。流动水体产生的拖曳力会使记录器沿流向倾斜，记录器内置的加速度计与磁力计通道可记录倾斜幅值与倾斜方向（罗盘方位角）。本阵列共包含3台海流计，部署位置与上述三处热液喷口邻近，且未连接能源节点。部署前已将各海流计的内部时钟校准为协调世界时（UTC）。回收后观测到的时钟漂移未纳入数据集主体，而是作为元数据收录于Table_TCM3EMSO_Azores 2016-2018中。