Huhn, Oliver; Rhein, Monika; Hoppema, Mario; van Heuven, Steven (2013): Chlorofluorocarbons measured on water bottle samples during POLARSTERN cruise ANT-XX/2 (ISPOL) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.787498, In supplement to: Huhn, O et al. (2013): Decline of deep and bottom water ventilation and slowing down of anthropogenic carbon storage in the Weddell Sea, 1984–2011. Deep Sea Research Part I: Oceanographic Research Papers, 76, 66-84, https://doi.org/10.1016/j.dsr.2013.01.005
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Coverage:
Median Latitude: -61.245016 * Median Longitude: 8.881777 * South-bound Latitude: -69.381800 * West-bound Longitude: -0.112300 * North-bound Latitude: -50.250500 * East-bound Longitude: 23.048100
Date/Time Start: 2002-11-29T22:05:00 * Date/Time End: 2003-01-15T14:49:00
Minimum DEPTH, water: 20.81 m * Maximum DEPTH, water: 5339.40 m
Event(s):
PS63/026-2 * Latitude: -50.250500 * Longitude: 1.418300 * Date/Time: 2002-11-29T22:05:00 * Elevation: -3863.0 m * Location: South Atlantic Ocean * Campaign: ANT-XX/2 (PS63 06AQ200211_2) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO)
PS63/028-1 * Latitude: -52.003100 * Longitude: -0.107000 * Date/Time: 2002-11-30T22:45:00 * Elevation: -2936.0 m * Location: South Atlantic Ocean * Campaign: ANT-XX/2 (PS63 06AQ200211_2) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO) * Comment: Pmax = 2968 dbar
PS63/029-1 * Latitude: -52.491700 * Longitude: -0.102400 * Date/Time: 2002-12-01T06:28:00 * Elevation: -2666.0 m * Location: South Atlantic Ocean * Campaign: ANT-XX/2 (PS63 06AQ200211_2) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO) * Comment: Pmax = 2682 dbar
Comment:
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. Along the Greenwich Meridian 36 stations were sampled, along the section between 0° and the GeoBox thirteen stations, in the GeoBox six stations and along 23°E 14 stations. Overall 1007 water samples for CFCs were taken, of which 765 samples were analyzed successfully.
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).
Accuracy (i.e. uncertainties of calibrated sample volume, calibration curve, extraction efficiency, standard and working gas, water blank, etc.):
- CFC-12 < 1.5 %
- CFC-11 < 2.0 %
CFC measurements: Klaus Bulsiewicz
The tracer data set was carefully checked for accurate measurements and outliers. Quality flags: ? = doubtful; / = bad; # = mean of replicates.
Parameter(s):
# | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
---|---|---|---|---|---|---|
1 | Event label | Event | ||||
2 | Date/Time of event | Date/Time | ||||
3 | Latitude of event | Latitude | ||||
4 | Longitude of event | Longitude | ||||
5 | Elevation of event | Elevation | m | |||
6 | DEPTH, water | Depth water | m | Geocode | ||
7 | Pressure, water | Press | dbar | Huhn, Oliver | ||
8 | Freon-11 (trichorofluoromethane) | CFC-11 | pmol/kg | Huhn, Oliver | Gas chromatography | |
9 | Freon-12 (dichlorodifluoromethane) | CFC-12 | pmol/kg | Huhn, Oliver | Gas chromatography | |
10 | Freon-113 | CFC-113 | pmol/kg | Huhn, Oliver | Gas chromatography | |
11 | Bottle number | Bottle | Huhn, Oliver |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3816 data points
Download Data
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