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Oxygen concentrations from CTD bottle samples collected during AMT14

Originator's Protocol for Data Acquisition and Analysis

This data originates from analyses on samples collected from 43 CTD casts. Water samples were taken directly from the bottles in the Sea-Bird CTD rosette system using silicon tubing.

Dissolved oxygen concentration was determined by automated Winkler titration with photometric end-point detection (Williamson and Jenkinson, 1982).

References Cited

Williams P.J.leB. and Jenkinson N.W., 1982. A transportable micro processor controlled precise Winkler titration suitable for field station and shipboard use. Limnology and Oceanography, 27, 576-584.

Instrumentation Description

Not applicable for this data set.

BODC Data Processing Procedures

Data were submitted via email in an Excel spreadsheet archived under BODC's accession number PML040063. Sample metadata (CTD cast, date, bottle number and depth) were checked against information held in the database. There were a number of discrepancies: there were samples collected on 25/05/2004 that had no cast associated with them in the file, from looking at the range of bottle depths sampled the data were linked to cast 77. Also samples were provided with depths that bottles had not been fired at. These samples are listed below with the Originator's and BODC depths from the SeaBird files for comparison.

The concentration data were provided in micromoles per litre. These units for the concentration data were consistent with the BODC parameter code units and no conversion was applied.

The data were reformatted and loaded in BODC's samples database under Oracle Relational Database Management System. Data were marked up with BODC parameter codes and loaded into the database. Individual samples were matched through rosette sampling bottle and depth.

A parameter mapping table is provided below;

Data Quality Report

BODC was not advised of any specific quality issues with the data. The data were checked visually and used for the calibration of the CTD sensor. No values were flagged by BODC.

Problem Report

Not relevant to this data set.