Metadata Report for BODC Series Reference Number 2207580

• 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

PAP1 Mooring fluorometer and oxygen optode sensors (30 m): DY130 Data Quality Report

Negative chlorophyll values (CPHLPR01) which appear in this dataset have been flagged as suspect by BODC.

All chlorophyll data after 27/11/2021 23:30:00 were removed by BODC as data were null due to fluorometer malfunction.

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

Aanderaa Oxygen Optode 4330 and 4330F

The Oxygen Optode 4330/4330F is a compact fully integrated sensor for measuring oxygen concentration down to 6000 m. The optode is based on the ability of selected substances to act as dynamic fluorescent quencher. The fluorescent indicator is a special platinum porphyrin complex embedded in a gas permeable foil that is exposed to the surrounding water. The foil is attached to a sapphire window which provides optical access for the measuring system from inside a water tight housing.

The sensing foil is excited by modulated blue light, the sensor measures the phase of the returned red light. In order to improve stability, the optode also performs a reference phase reading by use of a red LED that does not produce fluorescence in the foil. By incorporating a temperature thermistor, linearisation and temperature compensation of the phase measurements are enabled, providing the absolute oxygen concentration.

Both models operate the same way, but the 4330F has a fast response foil. The sensors' specifications are noted below:

Further specifications can be found in the manufacturer's brochure.

PAP1 Mooring Seaguard fluorometer and optode (30 m): RRS Discovery DY130 BODC Data Processing

The PAP1 mooring was deployed on 03/04/2021 on the RRS Discovery cruise DY130 and was recovered on the RRS James Cook cruise JC231 on 05/05/2022. The data were collected from a nominal depth of 30 m and supplied to BODC in .csv format. The data were then loaded into BODC's database using established BODC data banking procedures. For more information on the deployment of these instruments please see the DY130 cruise report.

The originator variables were mapped to appropriate BODC parameter codes as follows:

The reformatted data were visualised using in-house EDSERPLO software. Any suspect data were flagged using the BODC quality control flags.

PAP1 mooring Seaguard fluorometer and optode (30 m): RRS Discovery DY130 Originator Data Processing

The Seaguard platform (SN 2075) housed two sensors that form part of the PAP-SO time series. The sensors were configured to record every hour and deployed on the 30 m sensor frame on the PAP1 buoy. Deployed on DY130 and recovered JC231.

Data from the oxygen optode (SN 1299) shows signs of biofouling - samples from the middle of the night show a close match to the ODO sited nearby and show the value of sensor redundancy (the lack of an RCM instrument may explain increased optode fouling as there is no 'shelter'). Oxygen data were processed using a salinity correction value of 35.5 PSU.

The Turner Fluorometer (SN 21100373) had a zebratech wiper to reduce fouling. A comparison with the nearby Wetlabs sensor at the start of deployment (n=4) gave a further calibration that can be applied: chlorophyll=0.41*Turner-0.06 (r²=0.95). The data have not been further calibrated or corrected for any drift.

Oxygen concentration at 30 m from bottle samples was 260-280 µM and chlorophyll concentration was 0.3-1.3 µg/l. Note that the Turner Cyclops fluorometer came loose late 2021 and damaged the Seaguard before dropping off - there is no chlorophyll data after 27th November, although, the optode continued to function.

Please see the DY130 cruise report and JC231 cruise report for further detail of originators processing.

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

Moored Instrument Rig PAP1_042021

This rig was deployed as part of the Porcupine Abyssal Plain (PAP) observatory project. 'PAP1_042021' refers to the deployment of mooring number 1 in April 2021 ('042021') located at the PAP Observatory. Further details of the deployment can be found in the DY130 cruise report.

Data summary

Instrumentation

The PAP1 mooring deployed on DY130 was the first complete platform using the MOBILIS surface buoy. The first deployment of the MOBILIS buoy on DY116 being recovered on this cruise did not have a sensor frame at 30m. Although both buoys have a modified keel skirt, the DY116 modification was double the mass of the one deployed on DY130 moving the centre of balance and buoyancy.

Related Data Activity activities are detailed in Appendix 1

Cruise

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

Porcupine Abyssal Plain (PAP) Observatory

The Porcupine Abyssal Plain (PAP) observatory is a site at which moorings were deployed in the Northeastern Atlantic, as part of the ANIMATE (Atlantic Network of Interdisciplinary Moorings and Time-series for Europe), MERSEA (Marine Environment and Security for the European Area), EuroSITES, Oceans2025, Fix03 and CLASS projects. The PAP site is centred at latitude 49° N and longitude 16.5° W. Moorings have occupied this region since 2002 and are typically deployed for 12 months.

Please note: Near Real Time data is only stored at BODC where delayed mode data were not recovered. All near real time data can be found at the OceanSites GDA and through IFREMER.

Data summary

Status Indicators

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: PAP1_042021

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: Porcupine Abyssal Plain (PAP)

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.