Metadata Report for BODC Series Reference Number 2245599

• 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

WETLabs ECO-FLNTU(SB) combined fluorometer and turbidity sensor

A combined fluorometer and turbidity sensor with an internal battery power supply. The instrument is designed to be used for autonomous operation. The (SB) designation signifies that this sensor is fitted with internal batteries for autonomous operation. Measures chlorophyll fluorescence at 470 nm and turbidity at 700 nm within the same volume. Chlorophyll is excited by the presence of an external light source, this excitement is detected as Chlorophyll-a fluorescence by a detector for a given sample volume of water. Turbidity is measured simultaneously by detecting the scattered light from an external light source. Key characteristics are two light sources: (1) two bright blue LEDs centred at 455 nm and modulated at 1 kHz (to excite Chlorophyll-a) and (2) one 700 nm LED (to scatter from particulate matter). Detectors for fluorescence and turbidity are positioned at a 140 degree angle to the light sources. The instrument is stable over a temperature range of 0 - 20 degC and is rated to a depth of 300 m as standard. The fluorometer can typically measure phytoplankton concentrations in the range 0.01-50 ug/l, with a sensitivity of 0.01 ug/l, at wavelengths of 470 (excitation) or 695 (emission) nm. The turbidity sensor can measure within the range 0.01-25 NTU, with a sensitivity of 0.01 NTU, at a wavelength of 700 nm.

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

Processing by BODC of PAP1 Moored Near Real Time (NRT) Wetlabs ECO-FLNTUSB (s/n 3050): DY103

The data were supplied to BODC in a single .CSV file and were converted to BODC internal NetCDF format using standard BODC processing procedures. The variables provided in the .CSV file were mapped to BODC parameter codes as follows:

The reformatted data were visualised using the in-house EDSERPLO software. Suspect data were marked by adding an appropriate quality control flag, missing data by both setting the data to an appropriate value and setting the quality control flag.

Processing by Originator of PAP1 Moored Near Real Time (NRT) Wetlabs ECO-FLNTUSB (s/n 3050): DY103

Sampling Strategy

The PAP1 mooring was deployed at 48.57936°N 16.22143°W on the 3^rd July 2019 during RRS Discovery cruise DY103 and recovered by RV Maria S. Merian on the 5^th November 2020. The Wetlabs ECO-FLNTUSB (s/n 3050) was housed in a metal frame at 30 m depth. The fluorometer s/n 3050 was positioned horizontally on the frame with the 30 degree sampling cone unobstructed. It was observed to sample before the frame was deployed. The fluorometer was set up to measure every four hours, and measure backscattering at 700 nm wavelength and chlorophyll fluorescence at 695 nm. The sensor was configured in Near Real Time processing workflow to sample in bursts of 8 samples and averaged to produce a single record for transmission. The instrument was then calibrated against the CTD fluorometer (Chelsey aqua tracker III) which had been calibrated by bottle samples run on a Turner triology bench top fluorometer (black 2, RF 0.31).

Buoy power on the DY103 PAP1 deployment failed after 80 days, the mooring parted and the frame was lost on 25^th October 2020. When the buoy power failed, the frame sensors were flooded. Data was therefore collected between 3^rd July 2019 and 30^th August 2019. These data were unaffected by the flooding of frame sensors.

Data acquisition and processing

On recovery, the factory calibrations were applied. WETLabs FLNTUSB raw count values are converted to Chlorophyll and NTU (Nephelometric Turbidity Units) values using the manufacturer-supplied coefficients for individual sensors. The count values are checked to ensure they lie between the minimum and maximum possible values.

Cruise Report

Further information may be found on sampling strategy and instrument calibrations in the deployment cruise report.

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_072019

This rig was deployed as part of the Porcupine Abyssal Plain (PAP) observatory project. 'PAP1_072019' refers to the deployment of mooring number 1 in July 2019 ('072019') located at the PAP Observatory.

Data summary

Instrumentation

The mooring design is an 'S' tether configuration allowing the mooring to better withstand the extremes of the environment it is in. The main surface buoy is an ODAS (Ocean Data Acquisition System) buoy, and below this buoy are 30 metres of chain with a conducting cable running along side. The chain is there to take the loads that the mooring will experience and the cable is a vehicle for the data. Attached to the bottom of the chain is the instrument frame, and coming out of the bottom of the frame is a cable attached to a subsurface buoy, an acoustic release and then finally a 3 tonne sinker weight. Further details on page 15 of the deployment cruise report.

Instruments on the subsurface frame are listed below:

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, CLASS, and AtlantiS 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_072019

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.