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Metadata Report for BODC Series Reference Number 1892048


Metadata Summary

Data Description

Data Category Hydrography time series at depth
Instrument Type
NameCategories
Sea-Bird SBE 37-SI MicroCAT C-T Sensor  water temperature sensor; salinity sensor
Instrument Mounting subsurface mooring
Originating Country United Kingdom
Originator Dr Jo Hopkins
Originating Organization National Oceanography Centre, Liverpool
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) Shelf Sea Biogeochemistry (SSB)
 

Data Identifiers

Originator's Identifier TS_CHAIN4_MC7460
BODC Series Reference 1892048
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2014-11-21 06:00
End Time (yyyy-mm-dd hh:mm) 2015-04-06 13:00
Nominal Cycle Interval 300.0 seconds
 

Spatial Co-ordinates

Latitude 49.39800 N ( 49° 23.9' N )
Longitude 8.60783 W ( 8° 36.5' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 49.0 m
Maximum Sensor or Sampling Depth 49.0 m
Minimum Sensor or Sampling Height 96.4 m
Maximum Sensor or Sampling Height 96.4 m
Sea Floor Depth 145.4 m
Sea Floor Depth Source SCILOG
Sensor or Sampling Distribution Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
Sensor or Sampling Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
 

Parameters

BODC CODERankUnitsTitle
AADYAA011DaysDate (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ011DaysTime (time between 00:00 UT and timestamp)
ACYCAA011DimensionlessSequence number
CNDCPR011Siemens per metreElectrical conductivity of the water body by in-situ conductivity cell
PPSAPR011MetresDepth below surface of the water body by semi-fixed in-situ pressure sensor and conversion to depth using unspecified algorithm
PREXPR011DecibarsPressure (measured variable) exerted by the water body by semi-fixed in-situ pressure sensor and corrected to read zero at sea level
PSALPR011DimensionlessPractical salinity of the water body by conductivity cell and computation using UNESCO 1983 algorithm
TEMPPR011Degrees CelsiusTemperature of the water body

Definition of Rank

  • Rank 1 is a one-dimensional parameter
  • Rank 2 is a two-dimensional parameter
  • Rank 0 is a one-dimensional parameter describing the second dimension of a two-dimensional parameter (e.g. bin depths for moored ADCP data)

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

SeaBird MicroCAT C-T Sensor (Serial Interface)

The SBE37-SI is a high-accuracy conductivity and temperature sensor with Serial Interface. It can be used as a stand-alone monitoring device or integrated with current meters, ROVs, AUVs, towed sonars or other instrumentation platforms.

The data can be outputed either in a raw state or in ASCII engineering units, as the calibration coefficients are stored in the EEPROM. The output always includes conductivity, temperature and pressure, if the optional sensor is installed. The user can choose from a combination of other parameters e.g. time, sound velocity, salinity, depth and density.

The optional pressure sensor employs a micro-machined silicon diaphragm that is essentially free of pressure hysteresis, due to its crystal structure. This sensor is provided by Druck.

Temperature is acquired by applying an AC excitation to a hermetically sealed VISHAY reference resistor and an ultra-stable aged thermistor. Conductivity is acquired using an ultra-precision Wien-Bridge oscillator.

The user can select three operational modes: autonomous, polled or serial line sync. The autonomous sampling comprises the continuous mode, at the fastest rate possible and the interval sampling, programmable for intervals of 6 s to 6 h. The polled sampling occurs when the instrument takes a sample and transmits the data, after a command sent from a computer, satellite, radio or wire telemetry equipment. On the serial line sync mode, the instrument, in response to a pulse from a serial line, wakes up, samples, stores the data, transmits it and goes to sleep.

There are two housings available, the titanium allows the instrument to collect data up to 7000 m and the plastic housing can be used for applications up to 250 m.

The specifications are presented below:

Parameter Measurement Range Initial accuracy Typical stability Resolution
Conductivity 0 to 7 S m-1 0.0003 S m-1 0.0003 S m-1 0.00001 S m-1
Temperature -5 to 35°C 0.002°C 0.0002°C month-1 0.0001°C
Pressure (optional) 20, 100, 350, 600,1000, 2000, 3500, 7000 m 0.1% of full scale range 0.05% of full scale range year-1 0.002% of full range scale

Further details can be found in the manufacturer's specification sheet.

Shelf Sea Biogeochemistry (SSB) Sea-Bird SBE 37-SI MicroCAT and Sea-Bird SBE 16Plus SEACAT C-T data from temperature chain mooring BODC Processing

Data from two instruments arrived at BODC in Matlab files. The instruments were the SBE37 and SBE16plus. The following table shows how the variables within the files were mapped to appropriate BODC parameter codes:

Originator's Variable Units BODC Parameter Code Units Comment
temp °C TEMPPR01 °C -
pres dbar PREXPR01 dbar -
sal psu PSALPR01 dimensionless -
cond s m-1 CNDCPR01 s m-1 -
depth m PPSAPR01 m -

The reformatted data were visualised using the in-house visualisation software. Suspect data were marked by adding an appropriate quality control flag. Missing data are set to an appropriate value and the corresponding flag added. Data prior to deployment and post recovery of the fifth deployment have been removed due to the instruments being left to record data while on deck for significant time periods.

Shelf Sea Biogeochemistry (SSB) mooring Originator's processing

Sampling and acquisition

The following information has been taken from the method statement (see Wihsgott) provided to BODC by the originator.

A long term temperature and salinity chain was deployed in the Central Celtic Sea (CCS) as part of the Shelf Sea Biogeochemistry programme. Five consecutive deployments covered a period of 17 months, from March 2014 to July 2015. The chain was deployed with a vertical resolution of 2.5 m in the main pycnocline region and 5 to 20 m vertical resolution in the surface and bottom layers. Sampling interval was set to 5 minutes for all instruments.

An alongside bedframe mooring included a SBE16plus instrument that was processed with the instruments from the temperature and salinity chain. The moorings were deployed less than a kilometre apart.

Pressure and conductivity were only recorded by the SBE instruments (SBE16plus, SBE37). For these instruments depth, salinity and potential density (for calibration purposes only) were derived using the Gibbs-SeaWater (GSW) Oceanographic Toolbox (McDougall and Barker, 2011).

Calibration procedures

The moored instruments were calibrated against pre- and post-deployment CTD casts. Each instrument accuracy was also taken into consideration when applying the correction. Small scale instances of vertical instability were not removed by the originator.

Time drift was identified in some instruments however a correction was not applied to the data as it was considered negligible when compared with the sampling interval and deployment period.

References

McDougall, T. J. and Barker, P. M. (2011) Getting started with TEOS-10 and the Gibbs Sea- water (GSW) Oceanographic Toolbox,. SCOR/IAPSO WG127.

Wihsgott, J. QC of long term TS-chain mooring at CCS, 13pp.


Project Information

Shelf Sea Biogeochemistry (SSB) Programme

Shelf Sea Biogeochemistry (SSB) is a £10.5 million, six-year (2011-2017) research programme, jointly funded by the Natural Environment Research Council (NERC) and the Department for Environment, Food and Rural Affairs (DEFRA). The aim of the research is to reduce the uncertainty in our understanding of nutrient and carbon cycling within the shelf seas, and of their role in global biogeochemical cycles. SSB will also provide effective policy advice and make a significant contribution to the Living with Environmental Change programme.

Background

The Shelf Sea Biogeochemistry research programme directly relates to the delivery of the NERC Earth system science theme and aims to provide evidence that supports a number of marine policy areas and statutory requirements, such as the Marine Strategy Framework Directive and Marine and Climate Acts.

The shelf seas are highly productive compared to the open ocean, a productivity that underpins more than 90 per cent of global fisheries. Their importance to society extends beyond food production to include issues of biodiversity, carbon cycling and storage, waste disposal, nutrient cycling, recreation and renewable energy resources.

The shelf seas have been estimated to be the most valuable biome on Earth, but they are under considerable stress, as a result of anthropogenic nutrient loading, overfishing, habitat disturbance, climate change and other impacts.

However, even within the relatively well-studied European shelf seas, fundamental biogeochemical processes are poorly understood. For example: the role of shelf seas in carbon storage; in the global cycles of key nutrients (nitrogen, phosphorus, silicon and iron); and in determining primary and secondary production, and thereby underpinning the future delivery of many other ecosystem services.

Improved knowledge of such factors is not only required by marine policymakers; it also has the potential to increase the quality and cost-effectiveness of management decisions at the local, national and international levels under conditions of climate change.

The Shelf Sea Biogeochemistry research programme will take a holistic approach to the cycling of nutrients and carbon and the controls on primary and secondary production in UK and European shelf seas, to increase understanding of these processes and their role in wider biogeochemical cycles. It will thereby significantly improve predictive marine biogeochemical and ecosystem models over a range of scales.

The scope of the programme includes exchanges with the open ocean (transport on and off the shelf to a depth of around 500m), together with cycling, storage and release processes on the shelf slope, and air-sea exchange of greenhouse gases (carbon dioxide and nitrous oxide).

Further details are available on the SSB website.

Participants

15 different organisations are directly involved in research for SSB. These institutions are

  • Centre for Environment, Fisheries and Aquaculture Science (Cefas)
  • Meteorological Office
  • National Oceanography Centre (NOC)
  • Plymouth Marine Laboratory (PML)
  • Scottish Association for Marine Science (SAMS) / Scottish Marine Institute (SMI)
  • University of Aberdeen
  • University of Bangor
  • University of East Anglia (UEA)
  • University of Edinburgh
  • University of Essex
  • University of Liverpool
  • University of Oxford
  • Plymouth University
  • University of Portsmouth
  • University of Southampton

In addition, there are third party institutions carrying out sampling work for SSB, but who are not involved in the programme itself. These are:

  • The Agri-Food and Biosciences Institute (AFBI)
  • Irish Marine Institute (MI)
  • Marine Science Scotland (MSS)

Research details

Overall, five Work Packages have been funded by the SSB programme. These are described in brief below:

  • Work Package 1: Carbon and Nutrient Dynamics and Fluxes over Shelf Systems (CaNDyFloSS).
    This work package aims to perform a comprehensive study of the cycling of nutrients and carbon throughout the water column over the whole north-west European shelf. This will allow the fluxes of nutrients and carbon between the shelf and the deep ocean and atmosphere to be quantified, establishing the role of the north-west European continental shelf in the global carbon cycle.

  • Work Package 2: Biogeochemistry, macronutrient and carbon cycling in the benthic layer.
    This work package aims are to map the sensitivity and status of seabed habitats, based on physical conditions, ecological community structure and the size and dynamics of the nitrogen and carbon pools found there. This information will be used, in conjunction with some laboratory-based work, to generate an understanding of the potential impacts on the benthic community as a result of changing environmental conditions, such as rising CO2 levels.

  • Work Package 3: The supply of iron from shelf sediments to the ocean.
    The research for this work package addresses the question of how currents, tides, weather and marine chemistry allow new iron to be transported away from the shallow shelf waters around the United Kingdom (UK), to the nearby open ocean. This will ultimately allow an improved understanding of how the transport of iron in shelf waters and shelf sediments influences phytoplankton growth in open oceans. This in turn improves the understanding of carbon dioxide uptake by phytoplankton.

  • Work Package 4: Integrative modelling for Shelf Seas Biogeochemistry.
    The aim of this work package is the development of a new shelf seas biogeochemical model system, coupled to a state of the art physical model, that is capable of predicting regional impacts of environmental change of timescales from days to decades. It is envisaged that the combination of predictive tools and new knowledge developed in this work package will underpin development and implementation of marine policy and marine forecasting systems.

  • Work Package 5: Data synthesis and management of marine and coastal carbon (DSMMAC).
    This work package is funded by Defra and is also known by the name 'Blue Carbon'. The aim is to provide a process-based, quantitative assessment of the role of UK coastal waters and shelf seas in carbon storage and release, using existing data and understanding, and also emerging results from SSB fieldwork, experiments and modelling. Particular emphasis will be given to processes that may be influenced by human activities, and hence the opportunity for management interventions to enhance carbon sequestration.

Fieldwork and data collection

The campaign consists of the core cruises in the table below, to the marine shelf (and shelf-edge) of the Celtic Sea on board the NERC research vessels RRS Discovery and RRS James Cook. These cruises will focus on the physics and biogeochemistry of the benthic and pelagic zones of the water column, primarily around four main sampling sites in this area.

Cruise identifier Research ship Cruise dates Work packages
DY008 RRS Discovery March 2014 WP 2 and WP 3
JC105 RRS James Cook June 2014 WP 1, WP 2 and WP 3
DY026 RRS Discovery August 2014 WP1, WP 2 and WP 3
DY018 RRS Discovery November - December 2014 WP 1 and WP 3
DY021 (also known as DY008b) RRS Discovery March 2015 WP 2 and WP 3
DY029 RRS Discovery April 2015 WP 1 and WP 3
DY030 RRS Discovery May 2015 WP 2 and WP 3
DY033 RRS Discovery July 2015 WP 1 and WP 3
DY034 RRS Discovery August 2015 WP 2 and WP 3

Core cruises will be supplemented by partner cruises led by Cefas, MI, MSS, Bangor University and AFBI, spanning the shelf seas and shelf-edges around United Kingdom and Republic of Ireland.

Activities will include coring, Conductivity Temperature and Depth (CTD) deployments, Acoustic Doppler Current Profilers (ADCP) surveys, moorings and wire-walker deployments, benthic lander observatories, autonomous gliders and submersible surveys, Marine Snow Catcher particulate matter analysis, plankton net hauls, in-situ sediment flume investigations and laboratory incubations with core and sea water samples.


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2014-11-21
End Date (yyyy-mm-dd) 2015-04-04
Organization Undertaking ActivityNational Oceanography Centre, Liverpool
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierCSS_CANDYFLOSS_TS_CHAIN4_DY018_201411
Platform Categorysubsurface mooring

SSB Central Celtic Sea (CSS)/Candyfloss T-S chain mooring DY018 201411

This mooring was deployed as part of the Shelf Sea Biogeochemistry (SSB) project at the Central Celtic Sea (CSS)/Candyfloss site (49.32°N 8.49°W) at a nominal water depth of 145.4m.

Deployment cruise Deployment date Recovery cruise Recovery date
DY018 21/11/2014 DY029 04/04/2015

The table below lists the instruments deployed on this mooring:

Instrument type Instrument depth (m)
Sea-Bird SBE 16plus SEACAT C-T Recorder (S/N 4848) 10
RBR Solo T Temperature logger (S/N 76789) 15
Star-Oddi Starmon mini temperature recorder (S/N 3893) 21
RBR Solo T Temperature logger (S/N 76790) 25
Sea-Bird SBE 37-SI MicroCAT C-T Sensor (S/N 2506) 32
Star-Oddi Starmon mini temperature recorder (S/N 3894) 35
RBR Solo T Temperature logger (S/N 76791) 37
Star-Oddi Starmon mini temperature recorder (S/N 3896) 40
RBR Solo T Temperature logger (S/N 76792) 42
Sea-Bird SBE 16plus SEACAT C-T Recorder (S/N 5310) 45
Star-Oddi DST CTD (S/N 3613) 48
Sea-Bird SBE 37-SI MicroCAT C-T Sensor (S/N 7460) 51
Star-Oddi Starmon mini temperature recorder (S/N 3897) 55
Star-Oddi Starmon mini temperature recorder (S/N 3899) 60
Star-Oddi Starmon mini temperature recorder (S/N 3901) 65
Sea-Bird SBE 37-SI MicroCAT C-T Sensor (S/N 2081) 71
RBR Solo T Temperature logger (S/N 76794) 75
Star-Oddi Starmon mini temperature recorder (S/N 3903) 80
Star-Oddi Starmon mini temperature recorder (S/N 3905) 90
Sea-Bird SBE 37-SI MicroCAT C-T Sensor (S/N 7458) 101
RBR Solo T Temperature logger (S/N 76795) 111
RBR Solo T Temperature logger (S/N 76796) 121
Sea-Bird SBE 16plus SEACAT C-T Recorder (S/N 4737) 129

Data issues upon recovery