Noble gas (He, Ne isotopes) and transient tracer (CFC-11 and CFC-12) measurements from POLARSTERN cruise PS100 (northeast Greenland, 2016)

• Main Authors: Huhn, Oliver, Rhein, Monika, Bulsiewicz, Klaus, Sültenfuß, Jürgen
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: ARK-XXX/2; GN05; Bottle number; CFC11; CFC12; CTD/Rosette; CTD-L; CTD Large; CTD-RO; Date/Time of event; DEPTH; water; Elevation of event; Event label; Freon-11 (trichorofluoromethane); Freon-12 (dichlorodifluoromethane); Gas chromatographic (GC) separation on a capillary column; electron capture detection (ECD); He; Helium; Helium-4; Latitude of event; Longitude of event; Ne; Neon; noblegas; northeast Greenland; North Greenland Sea; Norwegian Sea; Polarstern; Pressure; Priority Programme 1889 Regional Sea Level Change and Society; PS100; PS100/002-1; PS100/013-2; PS100/015-2; PS100/015-5; PS100/019-2; PS100/020-1; PS100/021-2; PS100/022-1; PS100/027-1; PS100/028-2; PS100/028-4; PS100/033-2; PS100/035-1; PS100/037-2; PS100/037-4; PS100/038-1; Greenland; Fram Strait; glacier; Greenland Sea; North Greenland
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.931336; https://doi.org/10.1594/PANGAEA.931336

Noble gases (3He, 4He, 20Ne, 22Ne) In total we took 650 water samples for stable noble gas isotopes (3He, 4He, 20Ne, 22Ne) in copper tubes from 69 stations in Fram Strait, on the north-eastern Greenland shelf and nearby 79 North Glacier (79NG, Nioghalvfjerdsbræ). The water samples were stored from the CTD/water bottle system without contact to atmospheric air and preventing air bubbles into gas tight copper tubes, which are clamped of at both sides. In the IUP Bremen noble gas lab the samples were pre-processed with a UHV (ultra high vacuum) gas extraction system. Sample gases are transferred via water vapour into a glass ampoule kept at liquid nitrogen temperature. For analysis of the noble gas isotopes the glass ampoules are connected to a fully automated UHV mass spectrometric system equipped with a two stage cryogenic system. Regularly, the system is calibrated with atmospheric air standards (reproducibility <0.2%). Also measurement of line blanks and linearity are done. The performance of the Bremen facility is described in Sültenfuß et al. (2009). The total errors for the noble gas measurements are estimated to be 0.4% for 4He, 0.4% for total Ne, and 0.4% for δ3He. Chlorofluorocarbons (CFC-11, CFC-12) For the transient tracers (chlorofluorocarbons, CFC-11 and CFC-12), we took samples on 80 stations in Fram Strait, on the north-eastern Greenland shelf and nearby 79 North Glacier (79NG, Nioghalvfjerdsbræ). The Chlorofluorocarbon (CFC-11 and CFC-12) water samples from the CTD-bottle-system were stored in glass ampoules without contact to the atmosphere during the tapping. Immediately after sampling the ampoules are flame sealed after a CFC free headspace of pure nitrogen had been applied. The determination of CFC concentrations in the IUP Bremen gas chromatography lab is accomplished by purge and trap sample pre-treatment followed by gas chromatographic (GC) separation on a capillary column and electron capture detection (ECD). The system is calibrated by analyzing several different volumes of a known ...