The 2014 Greenland-Portugal GEOVIDE CTDO2 hydrographic and SADCP data (GO-SHIP A25 and GEOTRACES GA01)

The GEOVIDE cruise was carried out coast to coast between Portugal and Newfoundland via the south tip of Greenland, following the OVIDE line in the eastern part and crossing the Labrador Sea in the western part. The classical hydrographic rosette was cast 163 times at 78 different geographical positions called stations. While the CTD-O2 probe acquired continuous profiles of the “physical” variables (pressure, temperature, salinity and dissolved oxygen), 22 Niskin bottles were closed at different levels during the upcast to provide samples for biogeochemical analysis. After calibration, we find precisions for pressure, temperature, salinity and dissolved oxygen that fit the GO-SHIP international quality requirements. In parallel, but not simultaneously, a trace-metal rosette (TMR) was cast 53 times, also acquiring profiles of physical variables, and equipped with 24 Go-Flo bottles adapted for the sampling of trace metals. Depending on the number of operations, stations were identified as “Short” (one single CTD cast), “Large” (3 CTD casts), “XLarge” (up to 6) and “Super” (up to 11). All along the track of the ship, current magnitude and direction was measured by Ship Acoustic Doppler Current Profilers, down to 1000m depth.

GEOVIDE航次沿东部OVIDE断面航行，途经格陵兰南端，完成葡萄牙至纽芬兰的跨洋全程作业，并贯穿西部拉布拉多海。经典水文采水架（hydrographic rosette）在78个被命名为"站位"的不同地理点位共完成163次布放。CTD-O₂探头可连续采集"物理"变量（压力、温度、盐度与溶解氧）的剖面数据；22个尼斯金采水瓶（Niskin bottles）则在上浮过程中于不同水层关闭，为生物地球化学分析获取样品。经校准后，压力、温度、盐度与溶解氧的测量精度均符合GO-SHIP国际质量标准。并行开展（非同步进行）的痕量金属采水架（trace-metal rosette, TMR）共完成53次布放，其同样可采集物理变量剖面，并搭载了24个适配痕量金属采样的Go-Flo采水瓶（Go-Flo bottles）。根据作业次数，站位被划分为"Short"（单次CTD布放）、"Large"（3次CTD布放）、"XLarge"（最多6次）及"Super"（最多11次）四类。沿船舶航行全程轨迹，船载声学多普勒海流剖面仪可测量至1000米水深的海流流速与流向。