Title of dataset | Macronutrient data collected by RRS James Clark Ross cruise 116 around South Georgia (Southern Ocean), Dec 2004-Jan 2005 |
Narrative summary of dataset | The dataset comprises macronutrient (nitrate, phosphate, silicate, ammonia/ammonium) data collected on RRS James Clark Ross cruise 116 around South Georgia in the Southern Ocean. The data were collected between 22 December 2004 and 18 January 2005 as part of an integrated ecosystem analysis. They form part of a more extensive dataset collected over 30 years, between 1980 and 2009, by the British Antarctic Survey. |
Summary of processing methodology | Samples for vertical profiles were collected from water bottles attached to a CTD rosette. Chemical analyses were undertaken using a custom-built Segmented-Flow Analyser initially based on Chemlab colorimeters and Ismatec proportioning pumps until 1993 when Technicon colorimeters were adopted. Initially, data were logged to paper chart and processed manually but in the mid-1980s, data extraction was automated and processing was managed with a digitising tablet and associated PC. In 1993 as part of a comprehensive re-build, data were logged to a PC. Data acquisition and subsequent processing was achieved with custom-built software (BAS in-house and Cambridge Beacon Ltd) and this was updated further in the mid-1990s when National Instrument data acquisition programmes were used to collect data, and calibration along with data organisation were switched to commercially available spreadsheets.
For further details see: Whitehouse et al (2023), included in the data package, and referenced in the Documentation section. |
Supporting documentation | Whitehouse, M. J., Hendry, K. R., Tarling, G. A., Thorpe, S. E., and ten Hoopen, P.: A database of marine macronutrient, temperature and salinity measurements made around the highly productive island of South Georgia, the Scotia Sea and the Antarctic Peninsula between 1980 and 2009, Earth Syst. Sci. Data, 15, 211-224, https://doi.org/10.5194/essd-15-211-2023, 2023. Ward, P.: RRS James Clark Ross Cruise JR116: A study of community structure and production along the southern shelf of South Georgia and links with the Georgia Basin, BODC Cruise Inventory, 127 pp, https://www.bodc.ac.uk/resources/inventories/cruise_inventory/reports/jr116.pdf, 2005. |
Start date | 2004-12-22 |
End date | 2005-01-18 |