Citation:

j.dsr.2013.01.005

Name: Chlorofluorocarbons measured on water bottle samples during POLARSTERN cruise ANT-XXII/3
Published: 2013
License: https://creativecommons.org/licenses/by/3.0/

Always quote citation above when using data! You can download the citation in several formats below.

RIS Citation BibTeX Citation Text Citation Facebook TwitterShow Map Google Earth

Coverage:

Median Latitude: -62.475272 * Median Longitude: -15.092921 * South-bound Latitude: -71.283600 * West-bound Longitude: -58.790100 * North-bound Latitude: -47.664100 * East-bound Longitude: 4.261300

Date/Time Start: 2005-01-28T19:38:00 * Date/Time End: 2005-04-02T14:38:00

Minimum DEPTH, water: 9.2 m * Maximum DEPTH, water: 5467.4 m

Event(s):

PS67/021-1 * Latitude: -47.664100 * Longitude: 4.261300 * Date/Time: 2005-01-28T19:38:00 * Elevation: -4565.0 m * Campaign: (PS67 ANDEEP 3) * Basis: * Method/Device: (CTD-RO) * Comment: INST.:AWI; CTD-SN:T2678-C2446

PS67/025-2 * Latitude: -53.001700 * Longitude: 0.033200 * Date/Time: 2005-01-31T17:51:00 * Elevation: -2540.0 m * Campaign: (PS67 ANDEEP 3) * Basis: * Method/Device: (CTD-RO) * Comment: INST.:AWI; CTD-SN:T2678-C2446

PS67/026-1 * Latitude: -53.499800 * Longitude: 0.006600 * Date/Time: 2005-01-31T23:27:00 * Elevation: -2688.0 m * Campaign: (PS67 ANDEEP 3) * Basis: * Method/Device: (CTD-RO) * Comment: INST.:AWI; CTD-SN:T2678-C2446

Comment:

During the expedition a total of 800 samples on 60 CTD stations were collected for chlorofluorocarbons (CFC-11 and CFC-12), of which 723 where successfully analysed. The water samples from the rosette system were collected into 100 ml glass ampoules and sealed off after a CFC free headspace of pure nitrogen had been applied.

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 tapping. 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).

Accuracy (i.e. uncertainties of calibrated sample volume, calibration curve, extraction efficiency, standard and working gas, water blank, etc.):

- CFC-12 < 1.8 %

- CFC-11 < 3.1 %

Precision (i.e. mean error from 16 replicate samples):

- CFC-12 < 0.006 pmol/kg or < 1.2 % (which ever is greater)

We do not give a value for the precision of CFC-12. Offline sample chromatograms regularly show a negative peak in the vicinity of the CFC-11 peak, which decreases the accuracy of CFC-11 in comparison to CFC-12, and which does not allow giving an objective estimate of a precision for CFC-11.

Sampling on board and measurement of CFCs at the IUP Bremen was funded by the Deutsche Forschungsgemeinschaft within the SPP 1158 "Antarktisforschung", grant RH 25/27. We thank Eberhard Fahrbach, Gerd Rohardt, Mario Hoppema and the scientific party to participate in the ANT-XXII/3 expedition and for the excellent assistance and cooperation on board. We further thank the master and crew of RV Polarstern.

CFC measurements: Klaus Bulsiewicz

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	Freon-11 (trichorofluoromethane)	CFC-11	pmol/kg	Huhn, Oliver	Gas chromatography
8	Freon-12 (dichlorodifluoromethane)	CFC-12	pmol/kg	Huhn, Oliver	Gas chromatography
9	Bottle number	Bottle		Huhn, Oliver

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

2169 data points

Download Data

Download dataset as tab-delimited text — use the following character encoding:

View dataset as HTML (shows only first 2000 rows)