Citation:

j.dsr.2013.01.005

Name: Chlorofluorocarbons measured on water bottle samples during POLARSTERN cruise ANT-XX/2 (ISPOL)
Published: 2013
License: https://creativecommons.org/licenses/by/3.0/

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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: (PS63 06AQ200211_2) * Basis: * Method/Device: (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: (PS63 06AQ200211_2) * Basis: * Method/Device: (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: (PS63 06AQ200211_2) * Basis: * Method/Device: (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

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