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Huhn, Oliver; Rhein, Monika; Schröder, Michael; Bulsiewicz, Klaus; Sültenfuß, Jürgen (2017): CFC, and noble gas measurements during POLARSTERN cruise PS82 (ANT-XXIX/9) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.883799, In supplement to: Huhn, Oliver; Hattermann, Tore; Davis, Peter E D; Dunker, Erich; Hellmer, Hartmut H; Nicholls, Keith W; Østerhus, Svein; Rhein, Monika; Schröder, Michael; Sültenfuß, Jürgen (2018): Basal Melt and Freezing Rates From First Noble Gas Samples Beneath an Ice Shelf. Geophysical Research Letters, 45(16), 8455-8461, https://doi.org/10.1029/2018GL079706

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Funding:
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
Median Latitude: -75.023577 * Median Longitude: -32.517163 * South-bound Latitude: -77.919830 * West-bound Longitude: -38.954170 * North-bound Latitude: -73.465000 * East-bound Longitude: -25.743170
Date/Time Start: 2014-01-02T14:51:00 * Date/Time End: 2014-02-12T23:41:00
Minimum DEPTH, water: 0.5 m * Maximum DEPTH, water: 3186.6 m
Event(s):
PS82/001-1 * Latitude: -73.726000 * Longitude: -25.743170 * Date/Time Start: 2014-01-02T14:51:00 * Date/Time End: 2014-01-02T14:51:00 * Elevation: -3224.2 m * Location: Weddell Sea * Campaign: PS82 (ANT-XXIX/9) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO)
PS82/004-1 * Latitude: -74.684000 * Longitude: -29.754830 * Date/Time Start: 2014-01-03T08:14:00 * Date/Time End: 2014-01-03T08:14:00 * Elevation: -425.0 m * Location: Weddell Sea * Campaign: PS82 (ANT-XXIX/9) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO)
PS82/012-1 * Latitude: -74.590500 * Longitude: -28.429170 * Date/Time Start: 2014-01-03T23:11:00 * Date/Time End: 2014-01-03T23:11:00 * Elevation: -1415.0 m * Location: Weddell Sea * Campaign: PS82 (ANT-XXIX/9) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO)
Comment:
The tracer data set was carefully checked for accurate measurements and outliers. According to the WOCE standards the following flags were applied to each measurement: ? = flag 3 = doubtful; / = flag 4 = bad, # = flag 6 = mean of replicates.
Noble gases (3He, 4He, 20Ne): We took 540 water samples for stable noble gas isotopes (3He, 4He, Ne) in copper tubes from 68 stations. In the IUP Bremen noble gas lab the samples were processed in a first step with a UHV (ultra high vacuum) gas extraction system. The required vacuum conditions are achieved by a rotary pump and an oil diffusion pump. To maintain contamination-free samples, the extraction system is checked for leaks on each sample separately. Sample gases are transferred via water vapour into a glass ampoule kept at liquid nitrogen temperature. Quality checks of this sample preparation line are done on a routine basis. This includes special vacuum checks and preparing accurately defined samples for internal control measurement.
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 cryo system. Every 2 to 4 samples 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, doi:10.1080/10256010902871929).
Error estimate for absolute He and Ne concentrations and the d3He:
D(4He) < 1.0 %
D(Ne) < 1.0 %
D(d3He) < 0.5 %
Chlorofluorocarbons (CFC-11, CFC-12): For the transient tracers (chlorofluorocarbons, CFC-11, CFC-12), we took 1080 samples on 94 stations. The Chlorofluorocarbon (CFC-11 and CFC-12) water samples from the CTD-bottle-system are stored in glass ampoules without contact to the atmosphere during the taping. Immediately after sampling the ampoules are flame sealed after a CFC free headspace of pure nitrogen had been applied.
The loss of CFCs into the headspace is considered by a careful equilibration between liquid and gas phase under controlled conditions before the sealed ampoules are opened and a precise measurement of the volume of the headspace. 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 standard gas. CFC concentrations are calibrated on SIO98 scale (Prinn et al., 2000, doi:10.1029/2000JD900141). A more detailed description of the measurement system is given by Bulsiewicz et at. (1998, doi:10.1029/98JC00140).
Concentrations of CFC-11 and CFC-12 reported on SIO 98 scale (Prinn et al., 2000, doi:10.1029/2000JD900141).
Overall accuracy, including that off the calibration scale is estimated to be 2.5% for CFC-11 and 1.5% for CFC-12. The accuracy accounts for uncertainties of calibrated sample volume, calibration curve, extraction efficiency, standard and working gas, water blank, etc.
Acknowledgment: Sampling on board and measurement of CFCs and noble gases at the IUP Bremen was funded by the Deutsche Forschungsgemeinschaft within the SPP 1158 "Antarktisforschung", grant HU 1544/4-1. We thank Rainer Knust and the scientific party to participate in the ANT XXIX/9 expedition and for the excellent assistance and cooperation on board. We thank also master and crew of RV Polarstern.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventHuhn, Oliver
2Date/Time of eventDate/TimeHuhn, Oliver
3Latitude of eventLatitudeHuhn, Oliver
4Longitude of eventLongitudeHuhn, Oliver
5Elevation of eventElevationmHuhn, Oliver
6DEPTH, waterDepth watermHuhn, OliverGeocode
7Freon-11 (trichorofluoromethane)CFC-11pmol/kgHuhn, Oliver
8Freon-12 (dichlorodifluoromethane)CFC-12pmol/kgHuhn, Oliver
9HeliumHenmol/kgHuhn, Oliver
10δ Helium-3δ3He%Huhn, Oliver100 x ([3He/4He]obs/[3He/4He]atm.- 1)
11NeonNenmol/kgHuhn, Oliver
12Bottle numberBottle#Huhn, Oliver
License:
Licensing unknown: Please contact principal investigator/authors to gain access and request licensing terms (UNKNOWN)
Size:
4082 data points

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