Metadata Report for BODC Series Reference Number 1719392
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
Data Description |
|||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||
Data Identifiers |
|||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||
Time Co-ordinates(UT) |
|||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||
Spatial Co-ordinates | |||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||
Parameters |
|||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||
Problem Reports
No Problem Report Found in the Database
Data Access Policy
Open Data supplied by Natural Environment Research Council (NERC)
You must always use the following attribution statement to acknowledge the source of the information: "Contains data supplied by Natural Environment Research Council."
Narrative Documents
AML Micro CTD
A small, high accuracy CTD including a 4-electrode conductivity cell, temperature sensor, strain gauge pressure sensor and Delrin housing.
Sampling frequency is user-selectable up to 25Hz and the instrument has three sampling modes: continuous; defined increment of time or pressure; and on request. The unit is externally-powered and provides real time data as it has no internal data logging capabilities. It can support up to 2 optional additional analogue channels or one additional digital channel. The instrument has a maximum depth range of 6000m.
The standard Micro CTD Sensor is a three parameter, self contained, intelligent sensor. The basic configuration includes the following:
- conductivity sensor and electronics
- temperature sensor and electronics
- pressure sensor and electronics
- communications electronics
- data logger electronics
- waterproof pressure case
- connector cable
For more information about this model and specifications see the manufactures data sheet - AML Micro CTD.
Wave Hub site towed undulating CTD May 2012: Originator's processing
Sampling Strategy
An AML Micro CTD attached to an OSIL Minibat FC60 was deployed and recovered three times on 17 May 2012. The deployment and recovery of these instruments were from 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.
Wave Hub site towed undulating CTD May 2012: Processing by BODC
Data from an AML Micro CTD attached to an OSIL Minibat FC60 arrived at BODC in .CSV format and the associated metadata from the OSIL Minibat FC60 arrived at BODC in raw ASCII files.
The data from the Micro CTD arrived at BODC at a frequency of 25 Hz whereas the metadata output from the Minibat arrived at BODC at one second resolution. To merge the data together, BODC have binned the CTD data to one second resolution. The original outputs from both instruments are archived at BODC and are available on request if a different processing method is required.
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 | - |
| Pressure | Dbars | Pressure (spatial co-ordinate) exerted by the water body by profiling pressure sensor and corrected to read zero at sea level | PRESPR01 | Dbars | - |
| Conductivity | ms/cm | Electrical conductivity of the water body by CTD | CNDCST01 | Siemens per metre | Conversion applied to data to convert from millisiemens per centimeter to siemens per meter (divided by 10). |
| Salinity | psu | Practical salinity of the water body by CTD and computation using UNESCO 1983 algorithm | PSALST01 | dimensionless | no unit conversion necessary |
| Sound Velocity | m/s | Sound velocity in the water body | SVELXXXX | m/s | - |
| Density | Kilograms per cubic metre | Sigma-theta of the water body by CTD and computation from salinity and potential temperature using UNESCO algorithm | SIGTPR01 | Kilograms per cubic metre | - |
The reformatted data were visualised using the in-house visualisation software. If applicable suspect data are marked by adding an appropriate quality control flag. For instances of absent data, the data value is set to an appropriate value and a quality control flag is added.
Project Information
NERC Discovery Science - Wave Hub baseline study
Background
This proposal has been designed to fill urgent scientific gaps in relation to baseline studies in renewable energy test sites and to take advantage of the unique opportunity presented by the development of the Wave Hub demonstrator site.
This project was funded by the NERC grant - NE/I015108/1 Wave Hub baseline study.
It is essential to obtain this information prior to deployment of infrastructure to understand the impact of arrays of wave devices together with the Wave Hub infrastructure. This opportunity has already been lost at other wave energy device testing sites (such as at European Marine Energy Centre (EMEC), Orkney), because devices, together with infrastructure such as moorings and cabling have already been installed.
This project is also driven by the need to expand the science capability and resources over the next five years to address the questions which have arisen directly in respect of marine renewable energy development and sustainable use of marine resources. Hence, many of the activities are also viewed as capacity building and skill development within Plymouth Marine Laboratory (PML) - Partnership for Research in Marine Renewable Energy (PRIMaRE) that are pivotal to address the scientific requirements of the renewable energy sector.
Scientific Objectives
To obtain:
- Detailed oceanographic study at the Wave Hub site and surrounds - covering the whole range of physical, chemical and biological parameters before the deployment of Wave Hub infrastructure and wave energy devices.
- Ensure data acquisition in time and space to allow development of physical and ecosystem models at scales relevant to wave arrays. Ultimately models will make predictive assessments of the extent, timescales and intensity of ecosystem impacts and perturbation resulting from implementation of wave energy arrays.
- Engagement of environmental economists to ensure these same data can be used to develop economic valuation estimates of critical life supporting ecosystem services at scales appropriate to arrays of wave devices for comparison with other uses of marine space.
- To address the questions which have arisen directly in respect of marine renewable energy development and sustainable use of marine resources.
Fieldwork
The data were acquired from the RV Falcon Spirit, the Plymouth University vessel. The small 14m catermaran was used on a daily basis from 13 May 2012 to 24 May 2012 with the idea to capture high quality, spatially resolved field data ahead of the Wave Hub construction.
Instrumentation
Types of instruments/measurements:
- CTDs
- Moored temperature loggers
- VMADCP
- Moored ADCPs
- Towed undulated CTD
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
Cruise
| Cruise Name | 2012-05 |
| Departure Date | 2012-05-13 |
| Arrival Date | 2012-05-24 |
| 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 |
