Metadata Report for BODC Series Reference Number 2206700

• 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

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 SBE 37 SMP {MicroCAT-CTP} (submersible) CTD logger

A high accuracy conductivity and temperature recorder with an integrated pressure sensor designed for deployment on moorings. The SM model uses a serial interface (SM) for real-time data transmissions and has internal batteries. The device is fitted with an integral pump (P).

For more information, please see this document: https://www.bodc.ac.uk/data/documents/nodb/pdf/SeaBird-datasheet-SBE37-SMP-July18.pdf

Star-Oddi Starmon TD temperature depth logger

A small submersible temperature and depth data logger designed for ocean (titanium housing) or freshwater (aluminium housing) research. Depth range is 50 m - 500 m (aluminium) and 50 m - 2000 m (titanium). Temperature resolution is 0.002C, with an accuracy of +/-0.025C over a range -2C to 40C. Depth resolution is 0.005% of selected range, with an accuracy of +/-0.3% of selected range for 50 m to 2000 m range.

For more information, please see this document: https://www.bodc.ac.uk/data/documents/nodb/pdf/StarOddiStarmontdTDBrochure_2016.pdf

OSNAP Moored MicroCAT RTWB2 from Cruise DY120 - BODC Processing

The SBE 37 MicroCAT data (temperature, salinity, and pressure) from mooring RTWB2 of the Rockall Trough Ellet Array, deployed during cruise DY120, were supplied to BODC in a .microcat file format.

During transfer to BODC internal NetCDF format (QXF) the originator's variables were mapped to unique BODC parameter codes. The following table shows the paramater mapping:

Following transfer the data were screened using BODC in-house visualisation software. Suspect data values were assigned appropriate BODC data quality flags. Missing data values were changed to a BODC absent data value and assigned a data quality flag.

Processing by Originator of UK-OSNAP Moored MicroCAT WB2: DY120

Sampling Strategy

During the RRS Discovery cruise DY120 3 Seabird MicroCAT sensors were deployed at the UK-OSNAP WB2 site. They were set to record temperature, conductivity, and pressure. This mooring was recovered during the RRS James Cook cruise JC238.

Details of the RTWB2 mooring are provided below:

Data Acquisition and Initial Processing

The MicroCATs were all calibrated against the CTD sensors post-deployment. The three SBE37s were deployed on CTD cast 33 and stopped for 5 minutes at every bottle stop to a maximum depth of 2935m. The calibration dips for two out of the three MicroCat sensors were recorded as having considerable differences in conductivity with the CTD sensors. A summary of the calibration results is provided below:

*good = temperature offset <0.01°C, conductivity offset <0.00015 S/m, pressure offset variable

The processed data were supplied to BODC for banking.

Project Information

UK - Overturning in the Subpolar North Atlantic Programme (UK-OSNAP) Programme

UK-OSNAP is part of an international collaboration to establish a transoceanic observing system in the subpolar North Atlantic. The aim is to quantify and understand the Subpolar Gyre's response to local and remote forcing of mass, heat and freshwater fluxes, within the conceptual framework of the Atlantic Meridional Overturning Circulation (AMOC).

UK-OSNAP is developing a new observing system to provide a continuous record of full-depth, trans-basin mass, heat, and freshwater fluxes. Combining these sustained measurements with innovative modelling techniques will enable the project to characterise the circulation and fluxes of the North Atlantic Subpolar Gyre.

UK-OSNAP is funded by the Natural Environment Research Council (NERC). The project is led by the National Oceanography Centre (NOC) with partners in the University of Liverpool, the University of Oxford and the Scottish Association for Marine Science (SAMS). It is a part of international OSNAP that is led by USA and includes 10 further partner groups in Canada, France, Germany, the Netherlands and China. The project involves fieldwork at sea and model studies.

The OSNAP observing system consists of two legs: one extending from southern Labrador to the southwestern tip of Greenland across the mouth of the Labrador Sea (OSNAP West), and the second from the southeastern tip of Greenland to Scotland (OSNAP East). The observing system also includes subsurface floats (OSNAP Floats) in order to trace the pathways of overflow waters in the basin and to assess the connectivity of currents crossing the OSNAP line.

NERC have added an extension to UK-OSNAP, until October 2024. This will result in the UK-OSNAP-Decade: 10 years of observing and understanding the overturning circulation in the subpolar North Atlantic (2014-2024).

Data Activity or Cruise Information

Data Activity

OSNAP Moored Instrument WB2 2020-2022 Deployed on Cruise DY120

This rig was deployed as part of the Rockall Trough western boundary array of the Overturning in the Subpolar North Atlantic Programme (UK-OSNAP).

The rig was held down by an anchor on the seabed at 1801 metres depth.

The instruments deployed on the rig were as follows:

Related Data Activity activities are detailed in Appendix 1

Cruise

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

UK-OSNAP/Ellett Array Mooring RTWB2 (OM56)

Mooring RTWB2 (called OM56 by the International OSNAP Community) forms part of the OSNAP-East Transect and, from 2018, the Ellett Array. It was first deployed on 17^th July 2014 by the UK-OSNAP Community.

It is located at 57.4703°N, 12.3312°W where there is a water depth of 1800m

Between 2014 and 2018 this mooring was funded by UK-OSNAP, from 2018 it was funded as part of the Ellett Array by CLASS (Climate Linked Atlantic Sector Science).

Related Fixed Station activities are detailed in Appendix 2

BODC Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

SeaDataNet Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

Appendix 1: RTWB2_06_2020

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.

Appendix 2: UK-OSNAP/Ellett Array Mooring RTWB2 (OM56)

Related series for this Fixed Station 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.