Physical oceanography, anthropogenic tracers and noble gases during Maria S. Merian cruise MSM73

• Main Authors: Steinfeldt, Reiner, Kieke, Dagmar, Bulsiewicz, Klaus, Huhn, Oliver, Sültenfuß, Jürgen
• Format: Dataset
• Language: English
• Published: PANGAEA 2023
• Subjects: anthropogenic tracers; Bottle number; Capillary-chromatographic system with electron capture detector; CTD/Rosette; CTD-RO; DATE/TIME; Day of the year; Density; potential; DEPTH; water; ELEVATION; Event label; Freon-12 (dichlorodifluoromethane); Helium; LATITUDE; LONGITUDE; Maria S. Merian; Mass spectrometer; MSM73; MSM73_100-1; MSM73_10-1; MSM73_101-1; MSM73_102-1; MSM73_103-1; MSM73_104-1; MSM73_105-1; MSM73_106-1; MSM73_107-1; MSM73_108-1; MSM73_109-1; MSM73_1-1; MSM73_110-1; MSM73_111-1; MSM73_112-1; MSM73_113-1; MSM73_115-1; MSM73_116-1; MSM73_117-1; MSM73_118-1; MSM73_119-1; MSM73_120-1; MSM73_12-1; MSM73_121-1; MSM73_122-1; MSM73_123-1; MSM73_124-1; MSM73_125-1; MSM73_126-1; MSM73_127-1; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.962113; https://doi.org/10.1594/PANGAEA.962113

The bottle data on cruise MSM73 contain measurements of pressure, temperature, salinity and oxygen (derived from CTD values at the location of closing bottles) and direct measurements of oxygen, CFC-12, SF6 and the noble gases helium and neon. The data were collected with the research vessel Maria S. Merian. Region: subpolar North Atlantic, 11°W-54°W, 44°N-61°N, Ports: Cadiz - St. John's, Date: April 06 - May 22, 2018. The bottle data were collected by an SBE 32 water sampler system in connection with a SBE 911 plus CTD. The CTD was mounted to a metal frame with 22 Niskin bottles of 10 l volume, which was lowered from the sea surface down to 10 m above the seafloor. Pressure, temperature, salinity and oxygen data from the CTD were recorded at the time when closing the bottles. In addition, direct samples of salinity and oxygen from the water bottles have been taken to calibrate the CTD data. The accuracy of the CTD measurements is: 1 dbar for pressure, 0.001 °C for temperature, 0.003 for salinity, 4.0 µmol/kg for oxygen. The oxygen samples from the Niskin bottles have been analysed by Winkler titration with an accuracy of 2.5 µmol/kg. In addition, samples for the analyses of CFC-12 and SF6 have been analysed on board by a capillary-chromatographic system with electron capture detector. This device is an advancement from the one described in: Bulsiewicz, K., H. Rose, O. Klatt, A. Putzka, and W. Roether (1998), A capillary -column chromatographic system for efficient chlorofluorocarbon measurement in ocean waters, J. Geophys, Res., 103, 15959-15970. CFC-12 and SF6 values are reported on the SIO-98 scale. Accuracy is 2.5% for SF6 and 2.0% for CFC-12, detection limt 0.01 fmol/kg for SF6 and 0.002 pmol/kg for CFC-12. The samples for the noble gas measurements were stored in copper tubes. The gas from the tubes was extracted with a ultra high vacuum extraction system and then analysed with respect to helium and neon at the mass spectrometer facility at the University of Bremen (department of oceanography). Analytical ...