Metadata Report for BODC Series Reference Number 2035413
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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Time Co-ordinates(UT) |
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Parameters |
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Problem Reports
No Problem Report Found in the Database
Data quality report for CTD deployments by Marine Scotland Science during 2019
Data have been through thorough quality control checks conducted by Marine Scotland Science (MSS) and any quality control flags applied by MSS have been applied to the data during BODC processing. Additionally, improbable flags ('M') were applied to any derived parameters where MSS flagged a value as bad data in a channel used in the derivation. Interpolated flags ('T') were also applied to any derived parameters where MSS flagged a value as interpolated in a channel used in the derivation.
In addition to MSS quality checks, data were also screened by BODC using in house visualisation software during BODC processing. No additional flags were added by BODC.
CCOMD002
There are large spikes in CCOMD002 across a number of series but as the originator marked these spikes as good data the spikes were not flagged by BODC.
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
Instrumentation used for CTD deployments by Marine Scotland Science
| Sensor | Serial Number | Last Calibration Date |
|---|---|---|
| RBR Concerto CTD | 066100 | 26 JUL 2016 |
BODC Processing of Marine Scotland Science CTD deployments during 2019
Data Processing
Data were submitted to BODC as 12 ASCII files by email and following BODC procedures the data were archived. The data files were accompanied by a file of quality control flags. During BODC proccessing these flags were applied to the data. The header of each file contained the type of CTD used for each cruise, the sensors on the CTD and their serial numbers, an explanation of the format of the file and details of any calibrations.
The concatenated files were sub-divided into individual files for each cast using in house BODC Matlab software. The divided files were then transferred to BODC internal format using standard BODC processing procedures. The originator's variables were mapped to BODC parameter codes as follows:
| Originator's Variable | Units | BODC Parameter Code | Units | Comment |
|---|---|---|---|---|
| Pressure | dbar | PRESPR01 | dbar | |
| Temperature (edit) | °C | TEMPST01 | °C | This channel has had QC applied by the originator. |
| Conductivity (edit) | mS cm-1 | CNDCST01 | S m-1 | Conversion of /10 applied. This channel has had QC applied by the originator. |
| Temperature (pri) | °C | TEMPST01 | °C | Channel not transferred as the edited channel has been through originator's editing procedures and is of a better quality. |
| Conductivity (pri) | mS cm-1 | CNDCST01 | S cm-1 | Channel not transferred as the edited channel has been through originator's editing procedures and is of a better quality. |
| Temperature (sec) | °C | TEMPST02 | °C | Channel not transferred as the edited channel has been through originator's editing procedures and is of a better quality. |
| Conductivity (sec) | mS cm-1 | CNDCST02 | S cm-1 | Channel not transferred as the edited channel has been through originator's editing procedures and is of a better quality. |
| Fluorescence | ?g L-1 | CPHLPR01 | mg m-3 | Equivalent units. Channel is present in casts from cruises 0519S, 1119S, 1319S, 1419A, 1518S, 1919S. |
| Turbidity | NTU | TURBXXXX | NTU | Channel is present in casts from cruises 0519S, 1119S, 1319S, 1419A, 1518S, 1919S. |
| Oxygen | mL L-1 | DOXYZZ01 | ?mol L-1 | Conversion of * 44.66 applied. Channel is present in casts from cruises 0519S, 0919S, 1019S, 1519S. |
| Fluorescence CDOM-WL | ?g L-1 | CCOMD002 | mg m-3 | Channel is present in casts from cruises 0519S, 1519S, 1919S. |
| PSALST01 | dimensionless | Channel derived during transfer using Fofonoff and Millard (1983). | ||
| SIGTPR01 | kg m-3 | Channel derived during transfer using Fofonoff and Millard (1983). | ||
| OXYSZZ01 | % | Channel derived during transfer using Benson and Krause (1984) if oxygen channel is present. | ||
| CPHLPS01 | mg m-3 | Channel derived using the calibration provided by the originator when the calibration is present. |
Channels that were not transferred are available on request.
Screening
Post transfer analysis and crosschecks were applied according to BODC procedures. This involved the screening of data using BODC's in house visualisation software where any suspect data were flagged but not removed. During screening it was also checked that the originator's flags had been applied to the data correctly.
References
Benson B.B. and Krause D., 1984. The concentration and isotopic fractionation of oxygen dissolved in freshwater and seawater in equilibrium with the atmosphere. Limnol. Oceanogr., 29(3), 620-632.
Fofonoff N.P. and Millard R.C., 1983. Algorithms for computations of fundamental properties of seawater. UNESCO Technical Papers in Marine Science No. 44, 53pp.
Originator Processing of Marine Scotland Science CTD deployments during 2019
Sampling Strategy
During 2019 a number of Marine Scotland cruises occurred on the FRV Scotia and FRV Alba Na Mara were objectives covered trawl sampling, fish sampling, acoustic surveys and hydrographic sampling. As part of the hydrographic sampling numerous CTD casts were completed on each cruise. The time channel of these casts was recorded in GMT.
| Cruise | Cruise Dates | Number of CTD Casts |
|---|---|---|
| 0219S | 24 JAN 2019 - 13 FEB 2019 | 58 |
| 0319S | 17 FEB 2019 - 11 MAR 2019 | 58 |
| 0519S | 16 APR 2019 - 24 APR 2019 | 39 |
| 0919A | 08 JUN 2019 - 12 JUN 2019 | 9 |
| 0919S | 27 JUN 2019 - 19 JUL 2019 | 34 |
| 1019S | 22 JUL 2019 - 31 JUL 2019 | 39 |
| 1119S | 03 AUG 2019 - 23 AUG 2019 | 86 |
| 1319S | 14 SEP 2019 - 26 SEP 2019 | 19 |
| 1419A | 27 AUG 2019 - 30 AUG 2019 | 11 |
| 1519S | 14 OCT 2019 - 24 OCT 2019 | 85 |
| 1719S | 04 NOV 2019 - 25 NOV 2019 | 59 |
| 1919S | 12 DEC 2019 - 22 DEC 2019 | 68 |
Data Processing
The CTD data were processed by Marine Scotland using the Sea-Bird SeaSoft routines as recommended in the SeaSoft manual for model type Sea-Bird SBE19plus V2 SEACAT.
Pressure data were binned to 1 dbar using SeaSoft and the primary temperature and conductivity channels were adjusted to produce 'edit' channels. Marine Scotland regards the 'edit' channels as the definitive version of the data.
The adjustments consisted of a de-spiking process using Marine Scotland in-house visualisation software and, as necessary, application of a low pass filter as described in Sy (1985).
Field Calibrations
For a number of the cruises Marine Scotland used water samples collected during the CTD casts to generate a calibration equations for the conductivity, fluorescence and oxygen channels. However, these calibrations were not applied to the data by the originator. The available calibrations are as follows:
Conductivity
| Cruise | Number of samples used in calibration | Calibration Equation |
|---|---|---|
| 0219S | 57 | Calibrated Conductivity (mS cm-1) = measured conductivity x 0.980620 + 0.711140 |
| 0319S | 58 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.024100 - 0.920710 |
| 0519S | 78 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.000500 - 0.017821 |
| 0919A | 19 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.006000 - 0.223370 |
| 0919S | 65 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.000700 - 0.039311 |
| 1019S | 65 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.000700 - 0.039311 |
| 1119S | 86 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.001200 - 0.036143 |
| 1319S | 19 | Calibrated Conductivity (mS cm-1) = measured conductivity x 0.993370 + 0.275800 |
| 1419A | 19 | Calibrated Conductivity (mS cm-1) = measured conductivity x 0.999090 + 0.030650 |
| 1519S | 96 | Calibrated Conductivity (mS cm-1) = measured conductivity x 0.999810 + 0.009830 |
| 1719S | 59 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.004300 - 0.163590 |
| 1919S | 92 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.000800 - 0.021898 |
Fluorescence
| Cruise | Number of samples used in calibration | Calibration Equation |
|---|---|---|
| 0519S | 104 | Calibrated Fluorescence (µg L-1) = measured fluorescence x 0.002860 - 1.842900 |
| 1119S | 78 | Calibrated Fluorescence (µg L-1) = measured fluorescence x 0.001271 - 0.124540 |
| 1919S | 112 | Calibrated Fluorescence (µg L-1) = measured fluorescence x 0.000200 - 0.074915 |
Oxygen
| Cruise | Number of samples used in calibration | Calibration Equation |
|---|---|---|
| 0919S | 51 | Calibrated Oxygen (mL L-1) = measured oxygen x 1.042500 |
| 1519S | 12 | Calibrated Oxygen (mL L-1) = measured oxygen x 1.288100 |
| 1919S | 15 | Calibrated Oxygen (mL L-1) = measured oxygen x 1.877400 |
Reference
Sy A., 1985. An alternative editing technique for oceanographic data. Deep Sea Research, 32 (12), 1591-1599.
Project Information
No Project Information held for the Series
Data Activity or Cruise Information
Cruise
| Cruise Name | 1419A |
| Departure Date | 2019-08-27 |
| Arrival Date | 2019-08-30 |
| Principal Scientist(s) | Robert Watret (Marine Scotland Aberdeen Marine Laboratory) |
| Ship | FRV Alba Na Mara |
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 |
