Metadata Report for BODC Series Reference Number 2042016

• 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 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

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

Processing by BODC of Moored MicroCATs: AR30-04

The SBE 37 MicroCAT data were supplied to BODC as ASCII files representing the data collected from MicroCAT sensors deployed at the EB1, WB1, and WB2 sites as well as the IB3, IB4, and IB5 sites during cruise AR30-04.

During transfer to BODC internal 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 the appropriate BODC data quality flag. Missing data values, where present, were changed to the missing data value and assigned a BODC data quality flag.

Processing by originator of Moored MicroCATs: AR30-04

Sampling Strategy

During the RV Neil Armstrong cruise AR30-04, 11 Seabird MicroCATs were deployed at the UK-OSNAP EB1 site, 9 at the WB1 site, and 3 at the WB2 site. Additionally, 12 MicroCATs were deployed at the IB3 site, 12 at the IB4 site, and 7 at the IB5 site. They were set to record temperature, conductivity, and pressure. Some MicroCATs also recorded oxygen. These moorings were recovered during the RRS Discovery cruise DY120.

Data Acquisition and Initial Processing

The MicroCATs were calibrated against the CTD sensors. The MicroCATs were positioned on the CTD rosette and deployed before and after their deployment on the mooring. The calibrations were carried out based on 12 to 16 depths with 5 minute bottle stops. The MicroCATs were set to sample at their maximum rate of 0.1 Hz. For the EB1 mooring SBE 37 SMP-ODO MicroCATs measuring concentrations of dissolved oxygen, longer bottle stops of 20-30 minutes in duration were scheduled during the upcast. For calibration, the instruments were set to sample at 110 second intervals.

The processed data were supplied to BODC for banking. Oxygen data was not included and will be ingested separately by BODC.

Project Information

Marine LTSS: CLASS (Climate Linked Atlantic Sector Science)

Introduction

CLASS is a five year (2018 to 2023) programme, funded by the Natural Environment Research Council (NERC) and extended until March 2024.

Scientific Rationale

The ocean plays a vital role in sustaining life on planet Earth, providing us with both living resources and climate regulation. The trajectory of anthropogenically driven climate change will be substantially controlled by the ocean due to its absorption of excess heat and carbon from the atmosphere, with consequent impacts on ocean resources that remain poorly understood. In an era of rapid planetary change, expanding global population and intense resource exploitation, it is vital that there are internationally coordinated ocean observing and prediction systems so policy makers can make sound evidence-based decisions about how to manage our interaction with the ocean. CLASS will underpin the UK contribution to these systems, documenting and understanding change in the marine environment, evaluating the impact of climate change and effectiveness of conservation measures and predicting the future evolution of marine environments. Over the five-year period CLASS will enhance the cost-effectiveness of observing systems by migrating them towards cutting edge autonomous technologies and developing new sensors. Finally, CLASS will create effective engagement activities ensuring academic partners have transparent access to NERC marine science capability through graduate training partnerships and access to shipborne, lab based and autonomous facilities, and modelling capabilities.

Data Activity or Cruise Information

Data Activity

Ellett Array Moored Instruments EB1 2018-2020

This rig was deployed as part of the Rockall Trough Ellett Array.

The rig was held down by an 2100 kilogram anchor on the seabed at 1800 metres depth. It was kept erect by 40" syntactic float at 488 metres depth and a 31" syntactic float at 48 metres depth.

The instruments deployed on the rig were as follows:

ATLAS and AtlantOS funded sensors

Some of the sensors deployed on mooring RTEB1 were funded by ATLAS and AtlantOS. These were:

• SBE DeepSeaPhOx (CTD + O2 + pH) at 50 m (funded ATLAS)
• SBE SMP37 ODO (CTD + O2) at 750 m and 950 m (1 funded ATLAS, 1 funded AtlantOS)

The funding acknowledgement for the ATLAS and AtlantOS sensor data is:

'This project has received funding from the European Union's Horizon 2020 research and innovation programme, under grant agreement No 678760 (ATLAS) and No 633211 (AtlantOs). This output reflects only the author's view and the European Union cannot be held responsible for any use that may be made of the information contained therein.'

Issues with sensors

The following sensors had data issues:

• SBE SMP37-ODO MicroCAT S/N 15254 was affected by water ingress and no data was returned
• SBE SMP37-ODO MicroCAT S/N 15298 had unreliable conductivity and oxygen data between February to March 2020
• Nortek Aquadopp S/N 11069 returned no data between 2018-2020
• DeepSeaPhOx (seaFET S/N 0117 and SMP37-ODO S/N 15476) stopped recording data in September 2019

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 RTEB1 (OM57)

Mooring RTEB1 (called OM57 by the International OSNAP Community) forms part of the OSNAP-East Transect and, from 2018, the Ellett Array. It was first deployed on 18^th July 2014 by the UK-OSNAP Community.

It is located at 57.0993°N, 9.5480°W where there is a water depth of 1975m

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: RTEB1_05_2018

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 RTEB1 (OM57)

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.