Metadata Report for BODC Series Reference Number 1718641
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
Celtic Sea temperature logger mooring August 2012: Quality Report
The data recorded by the Star-Oddi DST CTD and Star-Oddi DST centi-TD produced suspect pressure and salinity values. The pressure readings reported values that did not correspond to the deployed depths and in one of the files were showing higher pressure readings that the sea water depth at high water. The salinity values in one file were >40 in one file and more than >37 in the other. Due to these suspicious values, BODC have flagged all the values from the pressure and salinity channels from these instruments. Therefore BODC recommend that the data from these channels are used with caution.
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
Star-Oddi DST centi-T Temperature Recorder
Description
The Data Storage Tag (DST) centi-T is a small submersible data logger with a temperature sensor. Recorded data is stored in its internal memory with a real-time clock reference for each measurement.
The sensors are housed in a strong waterproof cylinder made of alumina (an implantable biocompatible ceramic).
Specifications
Memory | 174,000 measurements in total; 261,819 bytes / temperature 1.5 bytes | ||
---|---|---|---|
Data Retention | 25 years | ||
Temperature Data | Temperature resolution | 0.032 °C | |
Temperature accuracy | ± 0.1 °C | ||
Temperature range | - 1 °C to + 40 °C | ||
Temperature response time | Time constant (63%) reached in 20 sec. | ||
Dimensions | 15 mm x 46 mm | ||
Communication Link | Downloaded via PC interface box. Connects to a computer via a RS-232C standard serial interface. | ||
Battery | A 3.6 V lithium battery with a life of 7 years for a sampling interval of 10 minutes or greater. |
Further details are available in the manufacturer's centi-T specification document.
Celtic Sea temperature logger mooring August 2012: Originator's processing
The temperature logger instruments were deployed on the 10 August 2012 to 22 August 2012 using the Plymouth University vessel, RV Falcon Spirit which is a 14 m catamaran.
Data Processing
No post-processing was applied to the files. They were submitted to BODC as raw ASCII format from the instrumentation.
Field Calibrations
No field calibrations were undertaken.
Celtic Sea temperature logger mooring August 2012: Processing by BODC
Data from three instruments arrived at BODC in ASCII files. This includes 2 Star-Oddi DST CTD files, 6 Star-Oddi DST centi-TD files and 9 Star-Oddi DST centi-T files with one file for each sensor used. The following table shows how the variables within the files were mapped to appropriate BODC parameter codes:
Originator's Variable | Units | Description | BODC Parameter Code | Units | Comment |
---|---|---|---|---|---|
Temperature | °C | Temperature of the water body | TEMPPR01 | °C | Applies to all files supplied. |
Pressure | Bars | Pressure (measured variable) exerted by the water body by semi-fixed in-situ pressure sensor and corrected to read zero at sea level | PREXPR01 | Dbars | Conversion applied to data to convert from bars to dbars (multiply by 10). Applies to only files linked to the DST centi-TD instrument |
Salinity | psu | Practical salinity of the water body by CTD and computation using UNESCO 1983 algorithm | PSALST01 | dimensionless | Applies to only files linked to the DST CTD instrument |
The reformatted data were visualised using the in-house visualisation software. Suspect data were marked by adding an appropriate quality control flag. Missing data are set to an appropriate value and the corresponding flag added. The data files have been modified to remove data points that were gathered when the instruments were being deployed and recovered.
Project Information
NERC Discovery Science - Assessing the sensitivity of marginally stratified shelf seas within a changing climate
Background
Continental shelf seas are extremely important because of the high levels of primary productivity that they sustain and their ability to absorb and sequester atmospheric gases including climatically important greenhouse gases. The key physical aspect of shelf seas that enables them to do so is the vertical density stratification, established throughout spring and summer when the stabilizing influence of solar radiation or fresh water overcomes the destabilizing influence of turbulent mixing.
In several places around the UK, such as the Irish Sea, well-established fronts form between stratified and vertically well-mixed water due to the well-understood dominant effect of friction generated at the sea bed by strong tidal currents whose influence extends throughout the water column. Throughout the majority of UK coastal waters tidal mixing is less dominant, however, and the competition between turbulent mixing and restratification is more delicately poised. Stratification and the resulting ephemeral fronts are transient in space and intermittent in time.
We are currently hindered in our ability to predict how these marginally stratified shelf seas will respond to change, however, because we do not fully understand the details of the turbulent mixing and restratification processes that govern the dynamic balance. Amongst these, surface and internal waves both exert an important but unclear influence over mixing, whilst lateral density gradients near the surface and seabed have recently been shown to modulate mixing and restratification. This lack of understanding is apparent from our inability to accurately simulate shelf sea dynamics in numerical models that are used to predict future changes.
The importance of this project stems from the realization that future changes to the Earth system are now inevitable due to climate change and will be particularly felt within marginally stratified shelf seas for which the balance between turbulent mixing and restratification is so sensitive to external perturbations. Furthermore, in order to produce 40% of the UK's electricity from renewable sources as required by EU law, a huge expansion into the marine environment to exploit its energy resources is expected.
This project was funded by the NERC Discovery Science grant NE/I001832/1 - Assessing the sensitivity of marginally stratified shelf seas within a changing climate.
Scientific Objectives
- To identify the processes involved in the existence and intensity of the front displays that are not governed by tidal periodicities.
- To test whether the processes that were identified as important to changes in shelf sea stratification through in-situ measurements are indeed responsible for the observed changes.
- To incorporate new knowledge into state-of-the-art numerical models that can up-scale the processes observed within this project to the shelf sea environment.
Fieldwork
To better understand which processes are most important within marginally stratified shelf seas, the plan is to conduct a rigorous field study and monitoring campaign in the southern Celtic Sea.
- Conduct a series of in-situ measurements of turbulence throughout the water column and by mapping the frontal structure.
- Monitor the long term trends in the forcing mechanisms and frontal integrity using seabed sensors and land-based radar that measures surface waves and currents over a broad spatial area.
The data were acquired from the RV Falcon Spirit, the Plymouth University vessel. The small 14m catamaran was used on a daily basis from 10 August 2012 to 22 August 2012.
Instrumentation
Types of instruments/measurements:
- Turbulence microstructure
- Moored temperature loggers
- VMADCP
- Moored ADCPs
- Minibat towed undulator transects
Contacts
Collaborator | Organisation |
---|---|
Dr Phil Hosegood (lead) | University of Plymouth School of Marine Science and Engineering |
Dr Ricardo Torres | Plymouth Marine Laboratory, U.K |
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 2012-08-10 |
End Date (yyyy-mm-dd) | 2012-08-24 |
Organization Undertaking Activity | University of Plymouth School of Marine Science and Engineering |
Country of Organization | United Kingdom |
Originator's Data Activity Identifier | Celtic Sea |
Platform Category | subsurface mooring |
Celtic Sea temperature logger mooring August 2012
Deployment | Plymouth University vessel, RV Falcon Spirit (2012-08-10 12:00) |
---|---|
Recovery | Plymouth University vessel, RV Falcon Spirit (2012-08-24 17:20) |
Deployment Position | 50.3454770°N, 5.6009730°W |
Water Depth (m) | 55.5 |
The thermistor string was kept upright by a large sub-surface float.
Instruments deployed on the mooring
The DST CTD recorded temperature, conductivity and pressure.
The centi-T recorded temperature.
The centi-TD recorded temperature and pressure.
The Originator has advised that salinity and pressure recordings from the Star-Oddi instruments are not of good quality and are to be used with caution.
Instrument codes
DST CTD - Star-Oddi DST CTD
centi-T - Star-Oddi DST centi-T Temperature Recorder
centi-TD - Star-Oddi DST centi-TD Temperature and Depth Recorder
Height above bed (m) | Instrument type | Instrument serial number |
---|---|---|
46 | centi-T | 5744 |
44 | DST CTD | 6090 |
42 | centi-T | 5743 |
40 | centi-TD | 5749 |
38 | centi-T | 5742 |
35 | centi-TD | 5748 |
33 | centi-T | 5741 |
30 | centi-TD | 5747 |
27 | centi-T | 5696 |
23 | centi-TD | 6011 |
19 | centi-T | 5695 |
15 | centi-T | 5690 |
11 | centi-TD | 5605 |
8 | centi-T | 5510 |
5 | centi-TD | 5604 |
2 | centi-T | 5509 |
1 | DST CTD | 6091 |
Related Data Activity activities are detailed in Appendix 1
Cruise
Cruise Name | 2012-08 |
Departure Date | 2012-08-10 |
Arrival Date | 2012-08-24 |
Principal Scientist(s) | Phil Hosegood (University of Plymouth School of Marine Science and Engineering) |
Ship | RV Falcon Spirit |
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 |
Appendix 1: Celtic Sea
Related series for this Data Activity are presented in the table below. Further information can be found by following the appropriate links.
If you are interested in these series, please be aware we offer a multiple file download service. Should your credentials be insufficient for automatic download, the service also offers a referral to our Enquiries Officer who may be able to negotiate access.
Series Identifier | Data Category | Start date/time | Start position | Cruise |
---|---|---|---|---|
1718585 | Hydrography time series at depth | 2012-08-10 13:56:00 | 50.34548 N, 5.60097 W | RV Falcon Spirit 2012-08 |
1718597 | Hydrography time series at depth | 2012-08-10 13:56:00 | 50.34548 N, 5.60097 W | RV Falcon Spirit 2012-08 |
1718604 | Hydrography time series at depth | 2012-08-10 13:56:00 | 50.34548 N, 5.60097 W | RV Falcon Spirit 2012-08 |
1718616 | Hydrography time series at depth | 2012-08-10 13:56:00 | 50.34548 N, 5.60097 W | RV Falcon Spirit 2012-08 |
1718628 | Hydrography time series at depth | 2012-08-10 13:56:00 | 50.34548 N, 5.60097 W | RV Falcon Spirit 2012-08 |
1718653 | Hydrography time series at depth | 2012-08-10 13:56:00 | 50.34548 N, 5.60097 W | RV Falcon Spirit 2012-08 |
1718665 | Hydrography time series at depth | 2012-08-10 13:56:00 | 50.34548 N, 5.60097 W | RV Falcon Spirit 2012-08 |
1718677 | Hydrography time series at depth | 2012-08-10 13:56:00 | 50.34548 N, 5.60097 W | RV Falcon Spirit 2012-08 |
1718689 | Hydrography time series at depth | 2012-08-10 13:56:00 | 50.34548 N, 5.60097 W | RV Falcon Spirit 2012-08 |
1718690 | Hydrography time series at depth | 2012-08-10 13:56:00 | 50.34548 N, 5.60097 W | RV Falcon Spirit 2012-08 |
1718708 | Hydrography time series at depth | 2012-08-10 13:56:00 | 50.34548 N, 5.60097 W | RV Falcon Spirit 2012-08 |
1718721 | Hydrography time series at depth | 2012-08-10 13:56:00 | 50.34548 N, 5.60097 W | RV Falcon Spirit 2012-08 |
1718733 | Hydrography time series at depth | 2012-08-10 13:56:00 | 50.34548 N, 5.60097 W | RV Falcon Spirit 2012-08 |
1718745 | Hydrography time series at depth | 2012-08-10 13:56:00 | 50.34548 N, 5.60097 W | RV Falcon Spirit 2012-08 |
1718757 | Hydrography time series at depth | 2012-08-10 13:56:00 | 50.34548 N, 5.60097 W | RV Falcon Spirit 2012-08 |
1718769 | Hydrography time series at depth | 2012-08-10 13:56:00 | 50.34548 N, 5.60097 W | RV Falcon Spirit 2012-08 |