Metadata Report for BODC Series Reference Number 2032347
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 2018
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. The following cycles have been flagged 'M' during BODC screening due to the value being an obvious outlier when compared to the rest of the CTD cast:
CCOMD002
- series 2034667: cycles 44 - 47
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 |
|---|---|---|
| Sea-Bird SBE 19plus SEACAT CTD | 6029 | 16 NOV 2017 |
| WETLabs ECO-FLNTU combined fluorometer and turbidity sensor | 0942 | 05 MAR 2008 |
Sea-Bird SBE 19 and SBE 19plus SEACAT Profiler CTDs
The SBE 19 SEACAT Profiler is a self-contained, battery powered, pumped CTD system designed to measure conductivity, temperature, and pressure in marine or fresh water environments to depths of 10,500 meters. It was replaced by the SBE 19plus model in 2001. An updated version of this instrument is the SBE 19plus V2, which incorporates an electronics upgrade and additional features, with six differentially amplified A/D input channels, one RS-232 data input channel, and 64 MB FLASH memory.
The standard CTD unit comes with a plastic housing (rated to 600 m), although this can be replaced by titanium housing for depths up to 7000 m. It is typically used for CTD profiling although a conversion kit is available for mooring deployments. The CTD can also be attached to an SBE 36 CTD Deck Unit and Power/Data Interface Module (PDIM) for real-time operation on single-core armored cable up to 10,000 m.
Specifications
| Parameter | SBE 19 | SBE 19plus |
|---|---|---|
| Temperature | Range: -5 to +35 °C Accuracy: 0.01 °C Resolution: 0.001 °C Calibration: +1 to +32 °C* | Range: -5 to +35 °C Accuracy: 0.005 °C Resolution: 0.0001 °C Calibration: +1 to +32 °C* |
| Conductivity | Range: 0 to 7 S m-1 (0 to 70 mmho cm-1) Accuracy: 0.001 S m-1 Resolution: 0.0001 S m-1 Calibration: 0 to 7 S m-1. Physical calibration over the range 1.4 - 6 S m-1* | Range: 0 to 9 Sm-1 Accuracy: 0.0005 Resolution: 0.00005 (most oceanic waters, resolves 0.4 ppm in salinity); 0.00007 (high salinity waters, resolves 0.4 ppm in salinity); 0.00001 (fresh waters, resolves 0.1 ppm in salinity) Calibration: 0 to 9 S m-1. Physical calibration over the range 1.4 - 6 S m-1* |
| Strain gauge pressure sensor | Range: 0 to100, 150, 300, 500, 1000, 1500, 3000, 5000, 10000 or 15000 psia Accuracy: 0.25% of full scale range (100 - 1500 psia); 0.15% of full scale range (3000 - 15000 psia) Resolution: 0.015% of full scale Calibration: 0 to full scale in 20% steps | Range: 0 to 20, 100, 350, 1000, 2000, 3500 or 7000 m Accuracy: 0.1% of full scale range Resolution: 0.002% of full scale range Calibration: ambient pressure to full scale range in 5 steps |
*Measurements outside this range may be at slightly reduced accuracy due to extrapolation errors.
Options and accessories
Additional sensors can be attached to the CTD, including:
- high accuracy Paroscientific Digiquartz pressure sensor (depth range 0 to 20, 60, 130, 200, 270, 680, 1400, 2000, 4200, 7000 or 10500 m; accuracy 0.02% of full scale; resolution 0.0025% of full scale)
- 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 standard SBE 5M pump may be replaced by an SBE 5P (plastic housing) or 5T (titanium housing) pump for use with dissolved oxygen and/or other pumped sensors. Further details can be found in the manufacturer's SBE 19plus V2 instrument specification or theSBE 19 andSBE 19 plus user guides.
WETLabs ECO FLNTU fluorescence and turbidity sensor
The Environmental Characterization Optics (ECO) Fluorometer and Turbidity (FLNTU) sensor is a dual wavelength, single-angle instrument that simultaneously determines chlorophyll fluorescence and turbidity. It is easily integrated in CTD packages and provides a reliable turbidity measurement that is not affected by Colored Dissolved Organic Matter (CDOM) concentration.
The FLNTU can operate continuously or periodically and has two different types of connectors to output the data. There are 5 other models that operate the same way as this instrument but have slight differences, as stated below:
- FLNTU(RT) - has an analog an RS-232 serial output and operates continuously, when power is supplied
- FLNTU(RT)D - similar to the FLNTU(RT) but has a depth rating of 6000 m
- FLNTUB - has internal batteries for autonomous operation
- FLNTUS - has an integrated anti-fouling bio-wiper
- FLNTUSB - has the same characteristics as the FLNTUS but with internal batteries for autonomous operation
Specifications
| Temperature range | 0 to 30°C |
| Depth rating | 600 m (standard) 6000 m (deep) |
| Turbidity | |
| Wavelength | 700 nm |
| Sensitivity | 0.01 NTU |
| Typical range | 0.01 to 25 NTU |
| Fluorescence | |
| Wavelength | 470 nm (excitation), 695 nm (emission) |
| Sensitivity | 0.01 µg L-1 |
| Typical range | 0.01 to 50 µg L-1 |
| Linearity | 99% R2 |
Further details can be found in the manufacturer's specification sheet.
BODC Processing of Marine Scotland Science CTD deployments during 2018
Data Processing
Data were submitted to BODC as 10 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 0318S, 0618S, 0718S, 1418S and 1818S. |
| Turbidity | NTU | TURBXXXX | NTU | Channel is present in casts from cruises 0318S, 0618S, 0718S, 1418S and 1818S. |
| Oxygen | mL L-1 | DOXYZZ01 | ?mol L-1 | Conversion of * 44.66 applied. Channel is present in casts from cruises 0618S, 1418S and 1818S. |
| Fluorescence CDOM-WL | ?g L-1 | CCOMD002 | mg m-3 | Channel is present in casts from cruises 0618S, 1418S and 1818S. |
| 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 2018
Sampling Strategy
During 2018 a number of Marine Scotland cruises occurred on the FRV Scotia 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 |
|---|---|---|
| 0218S | 23 JAN 2018 - 12 FEB 2018 | 55 |
| 0318S | 15 FEB 2018 - 07 MAR 2018 | 56 |
| 0618S | 02 MAY 2018 - 12 MAY 2018 | 75 |
| 0718S | 18 MAY 2018 - 31 MAY 2018 | 40 |
| 0918S | 28 JUN 2018 - 20 JUL 2018 | 40 |
| 1118S | 28 JUL 2018 - 17 AUG 2018 | 89 |
| 1318S | 19 SEP 2018 - 01 OCT 2018 | 19 |
| 1418S | 05 OCT 2018 - 15 OCT 2018 | 96 |
| 1718S | 12 NOV 2018 - 04 DEC 2018 | 53 |
| 1818S | 08 DEC 2018 - 18 DEC 2018 | 83 |
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 |
|---|---|---|
| 0218S | 109 | Calibrated Conductivity (mS cm-1) = measured conductivity - 0.000003 |
| 0318S | 108 | Calibrated Conductivity (mS cm-1) = measured conductivity + 0.000001 |
| 0618S | 80 | Calibrated Conductivity (mS cm-1) = measured conductivity x 0.999120 + 0.029856 |
| 0718S | 80 | Calibrated Conductivity (mS cm-1) = measured conductivity x 0.998910 + 0.042358 |
| 0918S | 79 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.000400 - 0.006832 |
| 1118S | 89 | Calibrated Conductivity (mS cm-1) = measured conductivity x 0.999090 + 0.041194 |
| 1318S | 19 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.086900 - 3.441900 |
| 1418S | 78 | Calibrated Conductivity (mS cm-1) = measured conductivity x 0.998830 - 0.037727 |
| 1718S | 53 | Calibrated Conductivity (mS cm-1) = measured conductivity x 0.996720 - 0.118010 |
| 1818S | 115 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.000400 - 0.010016 |
Fluorescence
| Cruise | Number of samples used in calibration | Calibration Equation |
|---|---|---|
| 0618S | 109 | Calibrated Fluorescence (µg L-1) = measured fluorescence x 0.000769 - 0.575380 |
| 1418S | 122 | Calibrated Fluorescence (µg L-1) = measured fluorescence x 0.000546 + 0.139600 |
Oxygen
| Cruise | Number of samples used in calibration | Calibration Equation |
|---|---|---|
| 0618S | 15 | Calibrated Oxygen (mL L-1) = measured oxygen x 1.108000 |
| 1418S | 24 | Calibrated Oxygen (mL L-1) = measured oxygen x 1.018400 |
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 | 1118S |
| Departure Date | 2018-07-28 |
| Arrival Date | 2018-08-17 |
| Principal Scientist(s) | Ruadhan Gillespie-Mules (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 |
