Metadata Report for BODC Series Reference Number 1907172
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
Data quality report for CTD deployments by Marine Scotland Science during 2016
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 '3 = probably bad data' (SeaDataNet quality flags were used by MSS) in a channel used in the derivation. An interpolated flag ('T') was also added to derived values where MSS flagged the value as interpolated in the channel used in the derivation.
In addition to MSS quality checks, data were screened by BODC using in house visualisation software during BODC processing. During BODC screening an outlier in series 1908396 was found in the CPHLPR01 and CPHLPS01 channels. The outlier was flagged 'M' as the values in both CPHLPR01 and CPHLPS01 were approximately 10 times higher than the rest of the profile.
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 during 2016
| Cruise | Manufacturer | Model | Sensor | Serial Number |
|---|---|---|---|---|
| 0316S, 0916S, 1116S, 1216S, 1416S (CTD set up 1), 1716S, 1916A | Sea-Bird | SBE 19plus V2 SEACAT | CTD | 6028 |
| WETLabs | ECO-FLNTU | Combined fluorometer and turbidity sensor | 0942 | |
| 0516S, 1416S (CTD set up 2), 1816S (CTD set up 1) | Sea-Bird | SBE 911plus | CTD | |
| Paroscientific | Digiquartz Depth sensors | Pressure | 64240 | |
| Sea-Bird | SBE 3plus | Temperature | 2041 | |
| Sea-Bird | SBE 4C | Conductivity | 1615 | |
| Sea-Bird | SBE 43 | Dissolved Oxygen | 0504 | |
| WETLabs | ECO-FLNTU | Combined fluorometer and turbidity sensor | 2542 | |
| Chelsea Technologies Group | UV Aquatracka | Fluorometer | 9644 | |
| WETLabs | ECO FL | Fluorometer | 3700 | |
| 0216S | Sea-Bird | SBE 19plus V2 SEACAT | CTD | 6029 |
| WETLabs | ECO-FLNTU | Combined fluorometer and turbidity sensor | 0947 | |
| 1816S (CTD set up 2) | Sea-Bird | SBE 25 | CTD |
Sea-Bird SBE 25 SEALOGGER CTD
The SBE 25 SEALOGGER is a research-quality CTD profiling system used for coastal, estuarine and, can also be a practical option, for deep-water work. It is easily configured in the field for a wide range of auxiliary sensors. The SEALOGGER is self-powered, requires no conductive cable, and is designed for use up to 6800 meters (10,000 psia). It uses the SBE3F temperature and SBE4 conductivity sensors as well as having an external strain gauge pressure sensor. It provides pump-controlled T-C ducted flow, samples at 8 Hz, records internally and provides simultaneous real-time data via its built-in RS-232 interface.
The standard CTD unit comes with a plastic housing (rated to 600 m), although this can be replaced by aluminium housing for depths up to 6800 m.
Specifications
| Parameter | SBE 25 |
|---|---|
| Temperature | Range: -5 to +35 °C Accuracy: 0.002 °C Resolution: 0.0003 °C |
| Conductivity | Range: 0 to 7 S m-1 (0 to 70 mmho cm-1) Accuracy: 0.0003 S m-1 Resolution: 0.00004 S m-1 |
| Strain gauge pressure sensor | Range: 0 to 20, 100, 350, 600, 1000, 2000, 3500, 7000 metres (expressed in metres of deployment depth capability) Accuracy: 0.1% of full scale range Resolution: 0.015% of full scale range |
Options and accessories
Additional sensors can be attached to the CTD, including:
- Dissolved Oxygen (SBE 43 DO Sensor)
- pH (SBE 18 pH Sensor or SBE 27 pH/ORP Sensor)
- fluorescence
- radiance (PAR)
- light transmission
- optical backscatter (turbidity)
The SBE 5T titanium pump can be used in place of SBE 5P pump. Further details can be found in the manufacturer's SBE 25 instrument specification.
BODC Processing of Marine Scotland Science CTD deployments during 2016
Data Processing
Data were submitted to BODC as 12 ASCII files by email and following BODC procedures the data were archived. The data from all cruises in 2016, with the expection of 0216S, 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. The channel is not present in the data from cruise 1816S for the casts that used a SeaBird SBE25. |
| 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. The channel is not present in the data from cruise 1816S for the casts that used a SeaBird SBE25. |
| Fluorescence | μg L-1 | CPHLPR01 | mg m-3 | Equivalent units. Channel is present in all casts from cruises 0516S and 1816S and casts that used a SeaBird SBE 19plus during cruise 1416S. |
| Turbidity | NTU | TURBXXXX | NTU | Channel is present in all casts from cruises 0516S and 1816S and casts that used a SeaBird SBE 19plus during cruise 1416S. |
| Oxygen | mL L-1 | DOXYZZ01 | μmol L-1 | Conversion of * 44.66 applied. Channel is present in all casts from cruise 0516S and casts that used a SeaBird SBE 19plus during cruises 1416S and 1816S. |
| Fluorescence CDOM-WL | μg L-1 | CCOMD002 | mg m-3 | Channel is present in all casts from cruise 0516S and casts that used a SeaBird SBE 19plus during cruise 1816S. |
| PSALST01 | dimensionless | Channel derived during transfer using Fofonoff and Millard (1983). | ||
| SIGTPR01 | kg m-3 | Channel derived during transfer using Fofonoff and Millard (1983). | ||
| OXYSSU01 | % | 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 2016
Sampling Strategy
During 2016 a number of Marine Scotland cruises occurred on the FRV Scotia and FRV Alba Na Mara where 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 |
|---|---|---|
| 0216S | 23 JAN 2016 - 12 FEB 2016 | 45 |
| 0316S | 16 FEB 2016 - 07 MAR 2016 | 63 |
| 0516S | 24 APR 2016 - 04 MAY 2016 | 41 |
| 0916S | 25 JUN 2016 - 15 JUL 2016 | 49 |
| 1116S | 05 AUG 2016 - 25 AUG 2016 | 99 |
| 1216S | 28 AUG 2016 - 08 SEPT 2016 | 18 |
| 1416S | 27 SEPT 2016 - 09 OCT 2016 | 33 using SeaBird SBE 19plus 61 using SeaBird SBE 911plus |
| 1716S | 17 NOV 2016 - 07 DEC 2016 | 61 |
| 1816S | 10 DEC 2016 - 20 DEC 2016 | 35 using SeaBird SBE25 20 using SeaBird SBE 911plus |
| 1916A | 15 OCT 2016 -31 OCT 2016 | 17 |
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 and fluorescence channels. These calibrations were not applied to the raw data by the originator but were supplied as metadata. The available calibrations are as follows:
Conductivity
| Cruise | Number of samples used in calibration | Calibration Equation |
|---|---|---|
| 0216S | 71 | Calibrated Conductivity (mS cm-1) = measured conductivity x 0.998400 + 0.063300 |
| 0316S | 126 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.020400 - 0.757100 |
| 0516S | 160 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.000100 - 0.003737 |
| 0916S | 70 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.001000 - 0.035455 |
| 1116S | 184 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.001200 - 0.036586 |
| 1416S | SeaBird SBE 19plus: 21 SeaBird SBE 911plus: 195 | SeaBird SBE 19plus: Calibrated Conductivity (mS cm-1) = measured conductivity x 0.999980 + 0.006639 SeaBird SBE 911plus: Calibrated Conductivity (mS cm-1) = measured conductivity x 0.999740 + 0.010805 |
| 1716S | 121 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.005300 - 0.201140 |
| 1816S | SeaBird SBE25: 62 SeaBird SBE 911plus: 16 | SeaBird SBE25: Calibrated Conductivity (mS cm-1) = measured conductivity x 1.000300 - 0.004721 SeaBird SBE 911plus: Calibrated Conductivity (mS cm-1) = measured conductivity x 0.999780 - 0.010326 |
Fluorescence
| Cruise | Number of samples used in calibration | Calibration Equation |
|---|---|---|
| 0516S | 86 | Calibrated Fluorescence (µg L-1) = measured fluorescence x 0.001853 - 0.208820 |
| 1416S | SeaBird SBE 911plus: 80 | SeaBird SBE 911plus: Calibrated Fluorescence (µg L-1) = measured fluorescence x 1.061600 + 0.112220 |
| 1816S | SeaBird SBE25: 31 SeaBird SBE 911plus: 47 | SeaBird SBE 911plus: Calibrated Fluorescence (µg L-1) = measured fluorescence x 0.000694 - 0.024802 SeaBird SBE25: Calibrated Fluorescence (µg L-1) = measured fluorescence x 0.000275 - 0.104180 |
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 | 1816S |
| Departure Date | 2016-12-10 |
| Arrival Date | 2016-12-20 |
| Principal Scientist(s) | Berit Rabe (Marine Scotland Aberdeen Marine Laboratory) |
| Ship | FRV Scotia |
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 |
