Calibrated CTD data from OSNAP Pelagia cruise 64PE473 in July-Aug 2020

• Main Author: de Jong, Femke
• Other Authors: Femke de Jong, NIOZ Royal Netherlands Institute for Sea Research in cooperation with Utrecht University
• Language: unknown
• Published: NIOZ 2023
• Subjects: Earth and Environmental Sciences; CTD; OSNAP; AR7E section; Greenland; Mid-Atlantic Ridge; Irminger Sea; Cape Farewell; East Greenland; North Atlantic
• Online Access: https://doi.org/10.25850/nioz/7b.b.1f

The goals of the research carried out during the cruise were to deploy surface drifters on the east Greenland shelf to investigate the export of freshwater towards deep convection areas, to service the five NIOZ Overturning of the Subpolar North Atlantic Program (OSNAP) moorings in the Irminger Sea located on the western flank of the Mid Atlantic Ridge, recover two lander deployed on the ridge by Ifremer in 2018 and to establish the hydrography along the OSNAP line (co-located with AR7E) to allow the study of inter-annual hydrographic variability. The data set published here comprises of the 67 CTD stations surveyed during the cruise. The cruise started and ended on Texel. After passing the Pentland Firth, a more or less direct line was steamed towards Cape Farewell, An initial CTD cast was done during the transit, for testing and training purposes, at 59? 36.71? N, 29? 31.34? W, on 18 July 2020. The first science station of the section was done just off Cape Farewell, at 60? 02.52? N, 43? 02.67? W, on 20 July 2020. The last station was done west of Rockall island, at 57? 34.90? N, 14? 36.87? W, on 11 August 2020, from where the Pelagia steamed back to Texel. Many of the CTD stations were taking near moorings along the OSNAP line, to facilitate use for mooring calibration. On the CTD stations, a total of 318 water samples were collected for the salinity calibration and 70 for oxygen calibration. Water samples were taken in layers with weak vertical gradients only. All samples have been analysed at NIOZ and final CTD data available here have been corrected for biases found against these samples.