Total Alkalinity (TA) and Dissolved Inorganic Carbon (DIC) concentrations from CTD bottle and underway samples collected during AMT12
Originator's Protocol for Data Acquisition and Analysis
This data originates from analyses on samples collected from 50 CTD casts and underway samples collected on 23 days during the cruise.
TA was measured on the cruise using the Versatile Instrument for the Determination of Titration Alkalinity (VINDTA) (Marianda, Kiel, Germany) and DIC was measured using the Single Operator Multiparameter Metabolic Analyser (SOMMA) system (URI, Rhode Island, USA). More details of the processes, calibrations, accuracy and precision are available in the AMT12 Cruise Report.
References Cited
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 UEA100088. Sample metadata (Cruise, station, date, latitude, longitude and depth) were checked against information held in the database. There was one discrepancy - a sample was reported from 3m on cast 16 however no bottle was fired at this depth on this cast, however a bottle was fired on cast 17 at 2m and the data have been loaded against this bottle. Casts 16 and 17 were sampled at the same location.
Parameter codes defined in BODC parameter dictionary were assigned to the variables. The data were provided in µmol kg -1 and these matched the parameter units in the BODC database.
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;
Originator's Parameter | Units | Description | BODC Parameter Code | Units | Comments |
---|---|---|---|---|---|
CT | µmol kg -1 | Concentration of carbon (total inorganic) {TCO2} per unit mass of the water body [dissolved plus reactive particulate phase] | TCO2MSXX | µmol kg -1 | n/a |
AT | µmol kg -1 | Total alkalinity per unit mass of the water body | MDMAP014 | µmol kg -1 | n/a |
Data Quality Report
BODC were not advised of specific quality checks carried out by the data originator.
Problem Report
Not relevant to this data set.