Abstract:
The dataset contains oxygen stable isotope and salinity measurements from water samples collected from sea ice and meltwater pools in April 2016 in the region of South Georgia, Signy and deep within the Weddell Sea pack ice during the marine survey JR15006.
The d18O and salinity measurements from sea ice and meltwater sources complement the same analysis from CTD casts and underway non-toxic flow water system on the RRS James Clark Ross during the JR15006. Establishing d18O and salinity values for saline water and oceanic freshwater components can be used to identify sources and changes of freshwater contributions to the ocean.
Keywords:
d18O, meltwater pool, salinity, sea ice
| Use Constraints: | Data released under Open Government Licence V3.0: http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
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| Creation Date: | 2018-10-05 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | UK PDC |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Prof Melanie Leng |
| Role(s) | Investigator |
| Organisation | British Geological Survey |
| Name | Ms Carol Arrowsmith |
| Role(s) | Investigator |
| Organisation | British Geological Survey |
| Name | Prof Michael Meredith |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Lineage: | At all sample locations, 2 or more salinity bottles and d18O vials were filled following the usual procedure. The d18O vials were rinsed 3 times, filled and dried before being closed with a stopper and sealed with the crimper. Oxygen isotope (d18O) measurements were made using the CO2 equilibration method with an Isoprime 100 mass spectrometer plus Aquaprep device. 90 samples (200µl of water) were loaded into Labco Limited exetainers (3.7ml) and placed in the heated sample tray at 40°C. The exetainers were then evacuated to remove atmosphere then flushed with CO2 and left to equilibrate for between 12 (first sample) - 37 (last sample) hours. Each individual gas sample was then admitted to the cryogenic water trap where any water vapour is removed. The dry sample gas was then expanded into the dual inlet where it was measured on the transducer before being expanded in the dual inlet bellows. Ionvantage software then balances the reference bellows relative to this volume. The sample and reference CO2 gases enter alternatively into the Isoprime100 through the dual changeover valve for isotope ratio measurement. In each run two laboratory standards (CA-HI and CA-LO) plus up to 2 secondary standards were analysed in triplicate. The value of these laboratory standards has been accurately determined by comparison with international calibration and reference materials (VSMOW2, SLAP2 and GISP) and so the 18O/16O ratios (versus VSMOW2) of the unknown samples can be calculated and are expressed in delta units, d18O (parts per mille). Errors are < +/- 0.05 per mil. | |
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| Temporal Coverage: | |
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| Start Date | 2016-03-31 |
| End Date | 2016-04-26 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -68.1511 |
| Northernmost | -54.30761 |
| Longitude | |
| Westernmost | -45.61521 |
| Easternmost | -27.04976 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Southern Ocean |
| Detailed Location | Weddell Sea |
| Location | Southern Ocean |
| Detailed Location | Scotia Sea |
| Sensor(s): |
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