Metadata Report for BODC Series Reference Number 1911423
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 2017
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. An improbable flag ('M') was also added to cycles in derived PSALST01 where CNDCST01 was interpolated by the MSS as the interpolation looked to be linear and resulted in large spikes in the PSALST01 channel.
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 1916520: cycles 1 and 2
- series 1916556: cycle 1
- series 1916581: cycle 1
- series 1916600: cycle 2
- series 1916612: cycle 1
- series 1916661: cycle 1
DOXYZZ01 and OXYSSU01
- series 1911712: cycle 1 has been flagged as the values are very low value when compared to rest of profile.
TURBXXXX
- series 1916520: cycle 2
- series 1916556: cycle 1
TEMPPR01 and POTMCV01
There are a few instances in TEMPPR01 and POTMCV01 where the first cycle of the profiles is an outlier when compared to the rest of the cast. However, as these values have been flagged good data by MSS they have not been flagged during BODC screening.
CPHLPR01 and CPHLPS01
There are spikes in the CPHLPR01 and CPHLPS01 parameters at the surface of a number of casts from cruise 1717S. As these have not been flagged by the originator and are from a similar area and time the values have not been flagged during BODC screening.
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 2017
Cruise | Manufacturer | Model | Sensor | Serial Number |
---|---|---|---|---|
1817A, 0217S, 0317S, 0817S, 1117S, 1217S, 1617S, 1717S | Sea-Bird | SBE 19plus V2 SEACAT | CTD | 6028 |
WETLabs | ECO-FLNTU | Combined fluorometer and turbidity sensor | 0942 | |
1717A, 0617S (CTD set up 1), 1417S | 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 | |
0617S (CTD set up 2) | Sea-Bird | SBE 25 | CTD | 0140 |
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 2017
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 2017 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 0617S 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 0617S for the casts that used a SeaBird SBE25. |
Fluorescence | μg L-1 | CPHLPR01 | mg m-3 | Equivalent units. Channel is present in all casts apart from cruises 0217S and 0317S. |
Turbidity | NTU | TURBXXXX | NTU | Channel is present in all casts apart from cruises 0217S and 0317S. |
Oxygen | mL L-1 | DOXYZZ01 | μmol L-1 | Conversion of * 44.66 applied. Channel is present in all casts from cruise 1417S, 1717S and casts that used a SeaBird SBE 19plus during cruise 0617S. |
Fluorescence CDOM-WL | μg L-1 | CCOMD002 | mg m-3 | Channel is present in all casts from cruise 1417S, 1717S and casts that used a SeaBird SBE 19plus during cruise 0617S. |
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 2017
Sampling Strategy
During 2017 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 |
---|---|---|
1717A | 13 OCT 2017 - 17 OCT 2017 | 14 |
1817A | 17 OCT 2017 - 03 NOV 2017 | 14 |
0217S | 22 JAN 2017 - 11 FEB 2017 | 51 |
0317S | 14 FEB 2017 - 06 MAR 2017 | 56 |
0617S | 21 MAY 2017 - 31 MAY 2017 | 11 using SeaBird SBE 25 48 using SeaBird SBE 911plus |
0817S | 29 JUN 2017 - 20 JUL 2017 | 18 |
1117S | 10 AUG 2017 - 30 AUG 2017 | 66 |
1217S | 02 SEP 2017 - 13 SEP 2017 | 9 |
1417S | 06 OCT 2017 - 16 OCT 2017 | 72 |
1617S | 13 NOV 2017 - 03 DEC 2017 | 53 |
1717S | 08 DEC 2017 - 18 DEC 2017 | 85 |
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. 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 |
---|---|---|
1717A | 27 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.468400 - 17.928400 |
1817A | 26 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.001200 - 0.061671 |
0217S | 103 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.000400 - 0.010094 |
0317S | 112 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.004800 - 0.172710 |
0617S | SeaBird SBE 911plus: 94 | SeaBird SBE 911plus: Calibrated Conductivity (mS cm-1) = measured conductivity x 1.000200 - 0.001531 |
0817S | 36 | Calibrated Conductivity (mS cm-1) = measured conductivity x 0.998740 + 0.059098 |
1117S | 130 | Calibrated Conductivity (mS cm-1) = measured conductivity x 0.999780 + 0.013440 |
1417S | 109 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.000200 - 0.003526 |
1617S | 104 | Calibrated Conductivity (mS cm-1) = measured conductivity x 1.001800 - 0.063502 |
1717S | 58 | Calibrated Conductivity (mS cm-1) = measured conductivity x 0.997780 + 0.089613 |
Fluorescence
Cruise | Number of samples used in calibration | Calibration Equation |
---|---|---|
0617S | SeaBird SBE 911plus: 106 SeaBird SBE25: 8 | SeaBird SBE 911plus: Calibrated Fluorescence (µg L-1) = measured fluorescence x 0.000617 + 1.056900 SeaBird SBE25: Calibrated Fluorescence (µg L-1) = measured fluorescence x 0.000777 - 0.107260 |
1417S | 91 | Calibrated Fluorescence (µg L-1) = measured fluorescence x 0.000500 + 0.210680 |
1717S | 103 | Calibrated Fluorescence (µg L-1) = measured fluorescence x 0.001166 - 0.070706 |
Oxygen
Cruise | Number of samples used in calibration | Calibration Equation |
---|---|---|
0617S | SeaBird SBE 911plus: 25 | SeaBird SBE 911plus: Calibrated Oxygen (mL L-1) = measured oxygen x 1.079700 |
1417S | 13 | Calibrated Oxygen (mL L-1) = measured oxygen x 1.084700 |
1717S | 10 | Calibrated Oxygen (mL L-1) = measured oxygen x 1.050900 |
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 | 0617S |
Departure Date | 2017-05-21 |
Arrival Date | 2017-05-31 |
Principal Scientist(s) | Alejandro Gallego (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 |