Metadata Report for BODC Series Reference Number 2211486

• Metadata Summary

• Problem Reports

• Data Access Policy

• Narrative Documents

• Project Information

• Data Activity or Cruise Information

• Fixed Station Information

• BODC Quality Flags

• SeaDataNet Quality Flags

Metadata Summary

Problem Reports

No Problem Report Found in the Database

Data Access Policy

Open Data

These data have no specific confidentiality restrictions for users. However, users must acknowledge data sources as it is not ethical to publish data without proper attribution. Any publication or other output resulting from usage of the data should include an acknowledgment.

If the Information Provider does not provide a specific attribution statement, or if you are using Information from several Information Providers and multiple attributions are not practical in your product or application, you may consider using the following:

"Contains public sector information licensed under the Open Government Licence v1.0."

Narrative Documents

Technicon AutoAnalyzer II (AAII)

The AAII is a segmented flow analyzer used for automated colorimetric analysis. The apparatus uses 2 mm diameter glass tubing and pumps reagents at flow rates of 2 to 3 ml s^-1, producing results at a typical rate of 30 to 60 samples per hour. The system comprises an autosampler, peristaltic pump, chemistry manifold a detector and a data acquisition software.

This instrument was replaced by the AA3 in 1997 which was upgraded to the AA3 HR systems in 2006.

Specifications

Nutrient data from the underway supply onboard RRS JCR, 1996 - 2009: Originator Data Processing

Sampling Strategy

As part of the British Antarctic Survey (BAS) ongoing long term monitoring, nutrient data were measured from the non-toxic underway supply on RRS James Clark Ross cruises around South Georgia and in the Scotia Sea between 1996 and 2009.

The ship's non-toxic seawater inlet was at 6-7 m and forward of the bows to avoid contamination. The time lag between seawater entering the ship's non-toxic inlet and reaching the chemistry laboratory was 60 s. On arrival at the chemistry laboratory, the stream of seawater passed through a tangential flow filter block (Morris et al., 1978) fitted with a filter membrane (mixed ester Whatman WME, pore size 0.45 μm).

Data Processing and Instrumentation

Temperature and conductivity measurements were taken with a SeaBird thermosalinograph as part of the underway system that sampled from the ship's non-toxic seawater supply. For this dataset, the underway temperature and conductivity measurements have not been calibrated against sample measurements but were averaged over a 60 s interval to smooth the data.

Nutrient data were analysed using a technicon colorimetric autoanalyzer.

Further information on the data collection and processing can be found in Whitehouse et al. 2023.

References

Whitehouse, M. J., Hendry, K. R., Tarling, G. A., Thorpe, S. E., and ten Hoopen, P., 2023 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.

Morris, A. W., Howland, R. J. M., and Bale, A. J., 1978 A filtration unit for use with continuous autoanalytical systems applied to highly turbid waters, Estuar. Coast. Mar. Sci., 6, 105-109, https://doi.org/10.1016/0302-3524(78)90045-2.

Nutrient data from the underway supply onboard RRS JCR, 1996 - 2009: Processing by BODC

Nutrient data from the non-toxic underway supply from 10 RRS James Clark Ross cruises (1996 - 2009) around South Georgia were supplied to BODC in a .csv file format.

During transfer to BODC internal NetCDF format the originator's variables were mapped to unique BODC parameter codes. The following table shows the parameter mapping:

Following transfer the data were screened using BODC in-house visualisation software. Suspect data values were assigned appropriate BODC data quality flags. Missing data values were changed to a BODC absent data value and assigned a data quality flag.

Project Information

BAS Long Term Monitoring and Survey

Introduction

The Long Term Monitoring and Survey project (LTMS) has been running since the British Antarctic Survey (BAS) was created. This project is one of the BAS core projects, with several groups of scientists collecting various types of data e.g biological, geological, atmospheric, among others.

Data collection is achievable through a wide scope of instruments and platforms, e.g. the Antarctic research stations, autonomous instrument platforms deployed on or from BAS research ships, BAS aircrafts, satellite remote sensing and others.

Scientific Objectives

This project was implemented in order to measure change and variability in the Earth system. Its long term duration allows for the monitoring of processes that could be missed in shorter term studies and experiments. The data collected is also used to check and improve the reliability of models used to stimulate and predict the behavior of the Earth system.

The main objectives are:

• Topographic survey
• Geosciences survey
• Biological survey and monitoring
• Atmospheric and oceanographic monitoring

Data Availability

The data sets obtained through this project are available to the academic community.

Data Activity or Cruise Information

Cruise

Complete Cruise Metadata Report is available here

Fixed Station Information

No Fixed Station Information held for the Series

BODC Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

SeaDataNet Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle: