Metadata Report for BODC Series Reference Number 907291
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
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Problem Reports
No Problem Report Found in the Database
D320 DMS (atmos) Data Quality Report
As part of the originator's QC procedures, erroneous values and contaminated measurements were replaced by absent data values. Contamination events occurred when winds coming from the stern sector of the ship blew exhaust into the sampling system and chemically interfered with the measurements. The data were inspected visually at BODC and no further action was taken
Data Access Policy
Public domain 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.
The recommended acknowledgment is
"This study uses data from the data source/organisation/programme, provided by the British Oceanographic Data Centre and funded by the funding body."
Narrative Documents
D320 DMS (atmos) BODC Data Processing
The data were provided to BODC in tab delimited text file format representing the one minute resolution atmospheric dimethyl sulphide concentration data collected during the UK SOLAS DOGEE-II cruise D320. TThese were reformatted to the BODC internal QXF (NetCDF) format with time as the single dimension using BODC transfer function 410. The following table shows how the DMS variables were mapped to the appropriate BODC parameter codes:
Originator's Variable | Units | Description | BODC Parameter Code | Units | Comments |
DMS_pptv | Parts per trillion by volume | Concentration of dimethyl sulphide per unit volume of the atmosphere | ACSUDMS1 | Parts per trillion by volume | n/a |
Lat_Ashtech | degrees | Latitude (positive north) by Ashtech GPS | ALATAS01 | degrees | Originator interpolated from one hourly measurements |
Lon_Ashtech | degrees | Longitude (positive east) by Ashtech GPS | ALONAS01 | degrees | Originator interpolated from one hourly measurements |
The reformatted data were visualised using the in-house EDSERPLO screening software.
D320 DMS (atmos) External Data Processing
Sampling and Analytical Methodology
Atmospheric DMS concentrations were measured using an atmospheric pressure ionisation mass spectrometer with an isotopically labeled internal standard (APIMS-ILS). The inlet for the atmospheric samples was located at 22.2 m above the sea surface on the foremast of the RRS Discovery. An isotopically labeled standard (d3-DMS) was continuously added to the sample air at the inlet. The spiked ambient air was delivered to the APIMS via a 5/8'' internal diameter tube at a rate of 120 L min-1 where 4 L min-1 were sub-sampled by the APIMS. Protonated molecular ions at mass 63 (DMS-H+) and mass 66 (d3-DMS-H+) were monitored sequentially. Signal intensities were recorded as total ion counts in a 20 millisecond interval at each mass. The ambient DMS concentration was calculated from the signal ratio (mass63/mass66), the flow rate and concentration of the labeled standard, and the total sample air flow rate. DMS concentrations were condensed to minute-averages. Instrument backgrounds (blanks) were obtained by passing zero air instead of sample air to the system and were subsequently subtracted from total counts before calculating the DMS concentration. The time lag of the transport of the sample air through the tubing to the APIMS was also taken into consideration during calculations. Including the uncertainties from flow rate, standard concentration and blanks, precision of the mean DMS concentration is about 10~15%.
Project Information
UK SOLAS, Deep Ocean Gas Exchange Experiment (DOGEE)
This project was led by Newcastle University, in collaboration with: University of Southampton; Plymouth Marine Laboratory; National Oceanography Centre, Southampton; University of East Anglia. The multidisciplinary team aimed to provide a holistic study of the exchange rates of gases important in biogeochemical cycles.
Fieldwork comprised of two dedicated open ocean research cruises in the North Atlantic Ocean: D313 and D320. During D320 an artifical surfactant patch was successfully deployed and sampled. The observational data include:
- sea state, whitecapping and wave breaking
- bubble properties
- surfactants
- air-sea gas fluxes
Complimentary measurements were made by US-based research groups who participated in both cruises.
More detailed information on this project may be found in the official cruise reports for the DOGEE cruises, D313 andD320.
Weblink: http://www.nerc.ac.uk/research/programmes/solas/
Data Activity or Cruise Information
Cruise
Cruise Name | D320 |
Departure Date | 2007-06-16 |
Arrival Date | 2007-07-18 |
Principal Scientist(s) | Robert Upstill-Goddard (Newcastle University School of Marine Science and Technology) |
Ship | RRS Discovery |
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:
Flag | Description |
---|---|
Blank | Unqualified |
< | Below detection limit |
> | In excess of quoted value |
A | Taxonomic flag for affinis (aff.) |
B | Beginning of CTD Down/Up Cast |
C | Taxonomic flag for confer (cf.) |
D | Thermometric depth |
E | End of CTD Down/Up Cast |
G | Non-taxonomic biological characteristic uncertainty |
H | Extrapolated value |
I | Taxonomic flag for single species (sp.) |
K | Improbable value - unknown quality control source |
L | Improbable value - originator's quality control |
M | Improbable value - BODC quality control |
N | Null value |
O | Improbable value - user quality control |
P | Trace/calm |
Q | Indeterminate |
R | Replacement value |
S | Estimated value |
T | Interpolated value |
U | Uncalibrated |
W | Control value |
X | Excessive difference |
SeaDataNet Quality Control Flags
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
Flag | Description |
---|---|
0 | no quality control |
1 | good value |
2 | probably good value |
3 | probably bad value |
4 | bad value |
5 | changed value |
6 | value below detection |
7 | value in excess |
8 | interpolated value |
9 | missing value |
A | value phenomenon uncertain |
B | nominal value |
Q | value below limit of quantification |