Metadata Report for BODC Series Reference Number 1326937
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 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
Sea-Bird SBE37-IM MicroCAT
The SBE 37-IM MicroCAT is a high accuracy conductivity and temperature recorder (pressure optional) with a built in Inductive Modem, which provides reliable, low-cost, real-time data transmission. Designed for moorings and other long-duration, fixed-site deployments, MicroCATs have non-corroding titanium housings rated for operation to 7000 metres or pressure sensor full scale-range.
Communication with the MicroCAT is via a Surface Inductive Modem (SIM) to a computer or data logger. Commands and data are transmitted half-duplex between the SIM and the MicroCAT using DPSK (differential-phase-shift-keyed) telemetry. As a safe guard, the MicroCAT simultaneously backs up the data in its non-volatile internal memory as well as transmitting the data via telemetry.
The MicroCAT's aged and pressure-protected thermistor has a long history of exceptional accuracy and stability (typical drift is less than 0.002 °C per year). Electrical isolation of the conductivity electronics eliminates any possibility of ground-loop noise.
Specifications
Temperature (°C) | Conductivity (S m-1) | Optional Pressure | |
---|---|---|---|
Measurement Range | -5 to +35 | 0 to 7 (0 to 70 mS cm-1) | 0 to full scale range: 20 / 100 / 350 / 600 / 1000 / 2000 / 3500 / 7000 metres |
Initial accuracy | 0.002 | 0.0003 | 0.1% of full scale range |
Typical Stability | 0.0002 per month | 0.0003 per month | 0.05% of full scale range per year |
Resolution | 0.0001 | 0.00001 | 0.002% of full scale range |
Sensor Calibration | +1 to +32 | 0 to 6; physical calibration over range 2.6 to 6 S m-1, plus zero conductivity (air) | Ambient pressure to full scale range in 5 steps |
Memory | 8 Mbyte non-volatile FLASH memory | ||
Data Storage | Converted temperature and conductivity: 5 bytes per sample (2.5 bytes each) Time: 4 bytes per sample Pressure (optional): 2 bytes per sample | ||
Real-Time Clock | 32,768 Hz TCXO accurate to ±1 minutes year-1 | ||
Standard Internal Batteries | 10.6 Ampere-hour pack consisting of 12 AA lithium batteries. Provides sufficient capacity for more than 200,000 samples for a typical sampling scheme | ||
Housing | Titanium pressure case rated at 7000 metres | ||
Weight (without pressure) | In water: 2.4 kg In air: 4.0 kg |
Further information can be found via the following link: Sea-Bird SBE37-IM MicroCAT Datasheet
Originators Processing RRS James Cook JC088 Site SE and SG MicroCAT Mooring data
Sampling Strategy
RRS James Cook cruise JC088 was the second of two cruises funded for the NERC 'Fluxes Across the Sloping Topography of the North East Atlantic (FASTNEt)' Consortium. JC088 was a 26 day cruise sailing on 28 June 2013 from King George V Dock, Govan, to the Malin Shelf edge where in-line and bedframe moorings were deployed, before returning to Southampton on 24 July 2013.
Data Processing
In total 9 SBE37 MicroCAT instruments were deployed at short term in-line moorings SE and SG.
The Originator has supplied a full record of calibrated temperature, conductivity and date/time for each MicroCAT file supplied. Some of the files also contain pressure and salinity.
Prior to submission to BODC, the data from the instruments had been converted to physical units and collated into a single matrix.
Calibrations
The pressure, temperature and conductivity recorded by the MicroCATs (serial numbers: 4966, 4998, 5433 and 5790) were cross calibrated in a bath after their deployment to asses any significant offsets needing correction. The pressure, temperature and conductivity recorded by the remaining Microcats on each chain were compared immediately before and after each deployment to asses any significant offsets needing correction.
The Originator states it was not possible to remove all the smaller scale instances of thermal instability and therefore has been left to the end user to make any further corrections (or removal of data) that are appropriate for the type of analysis they wish to perform.
The Originator has created gridded data sets of temperature and pressure from the chains of Starmon Miniloggers and MicroCATs for moorings SE and SG. These gridded data sets have been linearly interpolated onto a one minute grid. As the MicroCAT instruments recorded conductivity, salinity could be derived. To account for the difference in spatial resolution of temperature and salinity measurements, the Originator interpolated salinity data onto the temperature chain depth grid using the relationship of temperature and salinity over time. To remove small-scale discrepancies of the interpolated salinity data a low pass Butterworth filter was applied in vertical space (4 instruments, 3rd order).
The gridded data have not been processed by BODC but are available upon request.
Processing by BODC of RRS James Cook JC088 Site SE and SG MicroCAT Mooring data
Data from 9 MicroCATs arrived at BODC in Matlab structured files. The data were from two short term in-line moorings at site SE and SG. The data were reformatted to BODC's internal NetCDF format and the following table shows how the variables within the files were mapped to appropriate BODC parameter codes:
Originator's Variable | Originators Units | Description | BODC Parameter Code | BODC Units | Comment |
---|---|---|---|---|---|
Temperature | °C | Temperature of the water body | TEMPPR01 | °C | Included in all files supplied. |
Conductivity | Siemens per metre | Electrical conductivity of the water body by in-situ conductivity cell | CNDCPR01 | Siemens per metre | Included in all files supplied. |
Pressure | Decibars | Pressure (measured variable) exerted by the water body by semi-fixed moored SBE MicroCAT | PREXMCAT | Decibars | Files MC5790, MC5433, MC4966, MC4597, MC2506, MC4998 and MC9141. |
Salinity | Dimensionless | Practical salinity of the water body by conductivity cell and computation using UNESCO 1983 algorithm | PSALPR01 | Dimensionless | Files MC5790, MC5433, MC4966, MC4597, MC4998 and MC9141. |
Sigma Theta | - | - | - | - | NOT transferred but is available on request - File MC9141. |
Time drifts of order less than a minute were noted and applied by the Originator to the whole time series using linear interpolation. Files without the time drift applied have not been processed by BODC but are available on request.
The reformatted data were visualised using BODC's in-house visualisation software. Suspect data were marked by adding an appropriate quality control flag, missing data by both setting the data to an appropriate absent data value and setting the quality control flag.
Project Information
Fluxes Across Sloping Topography of the North East Atlantic (FASTNEt)
Background
The FASTNEt consortium was funded to deliver NERC's Ocean Shelf Edge Exchange Programme. Commencing in October 2011, this four year study aims to couple established observational techniques, such as moorings and CTDs, with the very latest in autonomous sampling initiatives - including use of Autosub Long Range and gliders. With the aid of novel model techniques, these observations will be utilised to construct a new paradigm of Ocean/Shelf exchange.
Shelf edge regions mark the gateway between the world's deep oceans and shallower coastal seas, linking terrestrial, atmospheric and oceanic carbon pools and influencing biogeochemical fluxes. Shelf edge processes can influence near-shore productivity (and fisheries) and ultimately affect global climate.
FASTNEt brings together researchers from multiple UK organisations. Further collaboration has been established with five Project Partners: the UK Met Office, Marine Scotland Science, Agri-Food and Biosciences Institute, Marine Institute Ireland and Scripps Institution of Oceanography.
Scientific Objectives
- To determine the seasonality of physical gradients and exchange across the shelf edge by deploying new observational technologies (gliders, Autosub Long Range) and established techniques (long term moorings, drifters)
- To quantify key exchange mechanisms and to collect new data targeted at testing and improving high resolution models of the shelf edge, by carrying out detailed process studies in contrasting regions of the shelf edge of the NE Atlantic margin
- To develop a new parameterisation of shelf edge exchange processes suitable for regional-scale models, using improved resolution numerical, and new empirical models constrained by the observations
- To test the new parameterisations in a regional model in the context of making an assessment of inter-annual variability of ocean-shelf exchange.
Fieldwork
Three survey sites on the UK shelf edge have been selected for FASTNEt. These are a) the Celtic Sea shelf edge, b) Malin shelf and c) North Scotland shelf. Fieldwork is centred around two research cruises. The first, to the Celtic Sea, on RRS Discovery in June 2012. The second cruise visits the Malin shelf on RRS James Cook, during summer 2013. In addition to these dedicated cruises, opportunist cruise activity to the North Scotland shelf has been agreed with project partner Marine Scotland Science. Autonomous technologies will complement observations made during the cruises and provide knowledge of seasonal and inter-annual variability in exchange processes.
Instrumentation
Types of instruments/measurements:
- Gliders
- Autosub Long Range
- Drifter buoys
- Scanfish
- Microstructure profilers
- Moored CTD/CT loggers and ADCPs
- Shipboard measurements: CTD, underway, nutrients (and other discrete sampling), LADCP, ADCP.
Contacts
Collaborator | Organisation |
---|---|
Prof. Mark Inall (lead) | Scottish Association for Marine Science, U.K |
Dr. Jason Holt | National Oceanography Centre, U.K |
Dr. Peter Miller | Plymouth Marine Laboratory, U.K |
Dr. Mattias Green | Bangor University, U.K |
Prof. Jonathan Sharples | University of Liverpool, U.K |
Dr. Vasyl Vlasenko | University of Plymouth, U.K |
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 2013-07-04 |
End Date (yyyy-mm-dd) | 2013-07-19 |
Organization Undertaking Activity | Scottish Association for Marine Science |
Country of Organization | United Kingdom |
Originator's Data Activity Identifier | JC088_SG |
Platform Category | subsurface mooring |
FASTNEt inline mooring SG
The short term mooring SG inline was deployed and recovered during cruise RRS James Cook JC088 as part of the Fluxes Across the Sloping Topography of the North East Atlantic (FASTNEt) project.
Instruments deployed on the mooring
Key
SM | STAR-ODDI Starmon mini (Temperature) |
MC | SBE 37 MicroCAT |
A/R | Acoustic release |
Nominal depth (m) | Instrument type | Instrument Serial number |
18.1 | SM | 4118 |
23.1 | SM | 4139 |
25.6 | SM | 4134 |
26.5 | subsurface float | - |
29.0 | MC | 2506 |
31.0 | SM | 4121 |
33.5 | SM | 4137 |
36.0 | SM | 4122 |
38.4 | SM | 4124 |
40.9 | SM | 4131 |
43.4 | MC | 2010 |
45.9 | SM | 4136 |
48.3 | SM | 4128 |
50.8 | SM | 4125 |
54.5 | MC | 4998 |
56.9 | SM | 4133 |
59.4 | SM | 4127 |
61.7 | MC | 9141 |
64.2 | SM | 4123 |
69.2 | SM | 4120 |
74.1 | SM | 4135 |
79.1 | SM | 4138 |
84.0 | SM | 4126 |
89.0 | SM | 3893 |
96.4 | MC | 2081 |
103.8 | SM | 3905 |
106 | A/R | 1326 |
118 | anchor | - |
Related Data Activity activities are detailed in Appendix 1
Cruise
Cruise Name | JC088 |
Departure Date | 2013-06-28 |
Arrival Date | 2013-07-24 |
Principal Scientist(s) | Mark E Inall (Scottish Association for Marine Science) |
Ship | RRS James Cook |
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: JC088_SG
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 |
---|---|---|---|---|
1326950 | Hydrography time series at depth | 2013-07-04 12:53:59 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357936 | Hydrography time series at depth | 2013-07-04 12:53:59 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1326925 | Hydrography time series at depth | 2013-07-04 12:54:00 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1326949 | Hydrography time series at depth | 2013-07-04 12:54:00 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1326962 | Hydrography time series at depth | 2013-07-04 12:54:01 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357807 | Hydrography time series at depth | 2013-07-04 12:54:03 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357820 | Hydrography time series at depth | 2013-07-04 12:54:03 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357844 | Hydrography time series at depth | 2013-07-04 12:54:03 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357985 | Hydrography time series at depth | 2013-07-04 12:54:03 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1358000 | Hydrography time series at depth | 2013-07-04 12:54:03 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357819 | Hydrography time series at depth | 2013-07-04 12:54:04 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357924 | Hydrography time series at depth | 2013-07-04 12:54:04 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357961 | Hydrography time series at depth | 2013-07-04 12:54:04 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357832 | Hydrography time series at depth | 2013-07-04 12:54:05 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357912 | Hydrography time series at depth | 2013-07-04 12:54:05 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357948 | Hydrography time series at depth | 2013-07-04 12:54:05 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357997 | Hydrography time series at depth | 2013-07-04 12:54:05 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357856 | Hydrography time series at depth | 2013-07-04 12:54:06 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357881 | Hydrography time series at depth | 2013-07-04 12:54:07 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357893 | Hydrography time series at depth | 2013-07-04 12:54:07 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357868 | Hydrography time series at depth | 2013-07-04 12:54:08 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357900 | Hydrography time series at depth | 2013-07-04 12:54:08 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1357973 | Hydrography time series at depth | 2013-07-04 12:54:08 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |
1358012 | Hydrography time series at depth | 2013-07-04 12:54:09 | 55.7964 N, 8.60758 W | RRS James Cook JC088 |