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Metadata Report for BODC Series Reference Number 2119057


Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
NameCategories
Teflon-coated Niskin bottle  discrete water samplers
Plymouth University Flow Injection Chemiluminescence system with Hamamatsu H8259 photon counting head  chemiluminescence analysers; flow injection analysers
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Mr Antony Birchill
Originating Organization University of Plymouth, School of Geography, Earth and Environmental Sciences
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) Shelf Sea Biogeochemistry Work Package 3
 

Data Identifiers

Originator's Identifier DY008_UCCTD_TMXX_4701:004
BODC Series Reference 2119057
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2014-03-21 16:04
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 51.12100 N ( 51° 7.3' N )
Longitude 6.16624 W ( 6° 10.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 11.2 m
Maximum Sensor or Sampling Depth 90.2 m
Minimum Sensor or Sampling Height 14.2 m
Maximum Sensor or Sampling Height 93.2 m
Sea Floor Depth 104.4 m
Sea Floor Depth Source BUDS
Sensor or Sampling Distribution Unspecified -
Sensor or Sampling Depth Datum Unspecified -
Sea Floor Depth Datum Unspecified -
 

Parameters

BODC CODERankUnitsTitle
ADEPZZ011MetresDepth (spatial coordinate) relative to water surface in the water body
BOTTFLAG1Not applicableSampling process quality flag (BODC C22)
DFEFICHL1Nanomoles per litreConcentration of total iron {total_Fe CAS 7439-89-6} per unit volume of the water body [dissolved plus reactive particulate <0.2um phase] by filtration and flow-injection chemiluminescence
DFEFICSD1Nanomoles per litreConcentration standard deviation of total iron {total_Fe CAS 7439-89-6} per unit volume of the water body [dissolved plus reactive particulate <0.2um phase] by filtration and flow-injection chemiluminescence
FIRSEQID1DimensionlessBottle firing sequence number
ROSPOSID1DimensionlessBottle rosette position identifier
SAMPRFNM1DimensionlessSample reference number

Definition of BOTTFLAG

BOTTFLAGDefinition
0The sampling event occurred without any incident being reported to BODC.
1The filter in an in-situ sampling pump physically ruptured during sample resulting in an unquantifiable loss of sampled material.
2Analytical evidence (e.g. surface water salinity measured on a sample collected at depth) indicates that the water sample has been contaminated by water from depths other than the depths of sampling.
3The feedback indicator on the deck unit reported that the bottle closure command had failed. General Oceanics deck units used on NERC vessels in the 80s and 90s were renowned for reporting misfires when the bottle had been closed. This flag is also suitable for when a trigger command is mistakenly sent to a bottle that has previously been fired.
4During the sampling deployment the bottle was fired in an order other than incrementing rosette position. Indicative of the potential for errors in the assignment of bottle firing depth, especially with General Oceanics rosettes.
5Water was reported to be escaping from the bottle as the rosette was being recovered.
6The bottle seals were observed to be incorrectly seated and the bottle was only part full of water on recovery.
7Either the bottle was found to contain no sample on recovery or there was no bottle fitted to the rosette position fired (but SBE35 record may exist).
8There is reason to doubt the accuracy of the sampling depth associated with the sample.
9The bottle air vent had not been closed prior to deployment giving rise to a risk of sample contamination through leakage.

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

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

Plymouth University Flow Injection Chemiluminescence system with Hamamatsu H8259 photon counting head

An analytical system manufactured by Plymouth University and used by Birchill et al. (2017) to determine concentrations of chemical species in a sample based on the luminescence of the species of interest. The system is normally uniquely assembled for each analysis, and comprises pumps, injection and autosampler valves, preconcentration columns and a Hamamatsu H8259 photon counting head for chemiluminescence detection. The H8259 device includes a side-on photomultiplier tube with a diameter of 28 mm, a high-speed photon counting circuit, and a high-voltage power supply circuit. Depending on the product type number used, the photon counting head device has a spectral response range of 185 nm to 680 nm, 850 nm or 900 nm, and a low dark count in UV to visible or near IR range.

For more information, please see this document: https://www.bodc.ac.uk/data/documents/nodb/pdf/hamamatsu_h8259

Niskin Bottle

The Niskin bottle is a device used by oceanographers to collect subsurface seawater samples. It is a plastic bottle with caps and rubber seals at each end and is deployed with the caps held open, allowing free-flushing of the bottle as it moves through the water column.

Standard Niskin

The standard version of the bottle includes a plastic-coated metal spring or elastic cord running through the interior of the bottle that joins the two caps, and the caps are held open against the spring by plastic lanyards. When the bottle reaches the desired depth the lanyards are released by a pressure-actuated switch, command signal or messenger weight and the caps are forced shut and sealed, trapping the seawater sample.

Lever Action Niskin

The Lever Action Niskin Bottle differs from the standard version, in that the caps are held open during deployment by externally mounted stainless steel springs rather than an internal spring or cord. Lever Action Niskins are recommended for applications where a completely clear sample chamber is critical or for use in deep cold water.

Clean Sampling

A modified version of the standard Niskin bottle has been developed for clean sampling. This is teflon-coated and uses a latex cord to close the caps rather than a metal spring. The clean version of the Levered Action Niskin bottle is also teflon-coated and uses epoxy covered springs in place of the stainless steel springs. These bottles are specifically designed to minimise metal contamination when sampling trace metals.

Deployment

Bottles may be deployed singly clamped to a wire or in groups of up to 48 on a rosette. Standard bottles and Lever Action bottles have a capacity between 1.7 and 30 L. Reversing thermometers may be attached to a spring-loaded disk that rotates through 180° on bottle closure.

Cruise DY008 soluble, dissolved and colloidal iron from clean CTD

Originator's Protocol for Data Acquisition and Analysis

Samples for determination of soluble iron (< 0.02 µm), dissolved iron (< 0.2 µm) and colloidal iron (Fe size-fraction [0.02-0.2 µm]) concentrations were collected during the Shelf Sea Biogeochemistry programme (18 March- 13 April 2014), from the Celtic Sea (50° N 8° W) to investigate the distriubtion of iron in the Celtic Sea as part of a wider seasonal study. The samples were collected during RRS Discovery cruise DY008, as part of the UK Shelf Sea Biogeochemistry research programme. Discrete samples were collected from CTD casts carried out with the titanium CTD. Samples were withdrawn from several depths, spanning the entire water column. The dataset contains depth profiles of the concentration of iron fractions provided in units of nmol L-1. Samples collected following trace metal protocols (Cutter et al., 2010) in acid clean LDPE bottles and acidifed to 0.024 M HCl (Romil, UpA) following collection. Soluble and dissolved iron sample stored for > 2 months before analysis, total dissolvable samples stored for > 6 months before analysis. The different iron fractions were analysed by flow injection with chemiluminesence detection (Obata et al 1993, Floor et al 2015). Colloidal Fe (0.02-0.2µm) was determined by calculating the difference between the DFe and SFe concentrations. Full details available in Birchill et al 2017.

References Cited

Birchill, A. J., Milne, A., Woodward, E. M. S., Harris, C., Annett, A., Rusiecka, D., Achterberg, E. P., GledhilL, M., Ussher, S. J., Worsfold, P. J., Geibert, W. and Lohan, M. C., 2017. Seasonal iron depletion in temperate shelf seas. Geophysical Research Letters, 44(17), 8987-8996.

Cutter, G. , Andersson, P. , Codispoti, L. , Croot, P. , Francois, R., Lohan, M. C. , Obata, H. and Rutgers v. d. Loeff, M., 2010. Sampling and Sample-handling Protocols for GEOTRACES Cruises.

Floor, G. H., Clough, R., Lohan, M. C., Ussher, S. J., Worsfold, P. J. and Quetel C. R., 2015. Combined uncertainty estimation for the determination of the dissolved iron amount content in seawater using flow injection with chemiluminescence detection. Limnology and Oceanography: Methods, 13(12), 673-686.

Obata, H., Karatani, H. and Nakayama E., 1993. Automated determination of iron in seawater by chelating resin concentration and chemiluminescence detection. Analytical Chemistry, 65(11), 1524-1528.

BODC Data Processing Procedures

Data were provided in an Excel spreadsheet and archived at BODC. The file contained the water sample data from an UltraClean CTD (UCCTD) bottles. Data received were loaded into the BODC database using established BODC data banking procedures. The data were loaded into BODC's database without any changes. The originator variables were mapped to appropriate BODC parameter codes as follows:

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

Originator's Parameter Unit Description BODC Parameter Code BODC Unit Comment
Colloidal Fe (nM) nM Concentration of total iron {total_Fe CAS 7439-89-6} per unit volume of the water body [colloidal 0.02-0.2µm phase] by filtration and flow-injection chemiluminescence and differencing results from two size-fractions CFEFICHL nmol/l Determined by calculating (DFe-SFe)
dFe nM Concentration of total iron {total_Fe CAS 7439-89-6} per unit volume of the water body [dissolved plus reactive particulate <0.2µm phase] by filtration and flow-injection chemiluminescence DFEFICHL nmol/l
SD_dFe nM Concentration standard deviation of total iron {total_Fe CAS 7439-89-6} per unit volume of the water body [dissolved plus reactive particulate <0.2µm phase] by filtration and flow-injection chemiluminescence DFEFICSD nmol/l
SD_sFe nM Concentration standard deviation of soluble iron {soluble_Fe CAS 7439-89-6} per unit volume of the water body [dissolved plus reactive particulate <0.02um phase] by filtration and flow-injection chemiluminescence SFEFICSD nmol/l
sFe nM Concentration of total iron {total_Fe CAS 7439-89-6} per unit volume of the water body [dissolved plus reactive particulate <0.02um phase] by filtration and flow-injection chemiluminescence SFEFICHL nmol/l

Project Information

Shelf Sea Biogeochemistry (SSB) Programme Work Package 3: Supply of iron from shelf sediments to the ocean

Work Package 3 is a £0.78 million component of the Natural Environment Research Council (NERC) Shelf Sea Biogeochemistry (SSB) research programme, running from 2013 to 2017. It is jointly funded by NERC and the Department for Environment, Food and Rural Affairs (DEFRA). The goal of this project is to quantify iron (Fe) fluxes from the north-west European shelf seas to the adjacent North Atlantic Ocean.

Background

Low iron (Fe) concentrations control productivity, phytoplankton community structure and carbon cycling in 25 % of the open ocean. Iron concentrations are tightly coupled to Fe supply, and Fe fluxes from shelf seas to the open ocean are poorly constrained, although estimates indicate they could be 2-10 times higher than atmospheric inputs and thus potentially a major contributor to the oceanic Fe cycle.

The goal of Work Package 3 will be realised during cruises in the Celtic Sea as part of the Shelf Sea Biogeochemistry Research Programme (SSB), which will provide the physical and chemical context for our study. The data collection will utilise trace metal clean sampling techniques, with associated physical diffusion and advection measurements, to determine the supply of dissolved, colloidal and particulate forms of Fe from sediments and their subsequent fate in shelf sea waters and during export to the North Atlantic Ocean. Data analyses will use Fe isotopes, physical-chemical Fe species characterisation and geochemical tracers to quantify the Fe supply, attenuation and export processes.

Further details are available on the SSB website.

Participants

6 different organisations are directly involved in research for SSB Work Package 3. These institutions are

  • Centre for Environment, Fisheries and Aquaculture Science (Cefas)
  • National Oceanography Centre (NOC)
  • Plymouth University
  • University of Edinburgh
  • University of Oxford
  • University of Southampton

Objectives

This Work Package aims to:

  • Study the processes whereby iron is released from shelf sediments into overlying waters, and how these mechanisms can be influenced by organic matter from decaying plant material

  • Provide new information on processes influencing release of iron to shelf waters to allow improved modelling of the size of this source, and of the key processes involved. For example, organic carbon inputs are expected to be associated with iron releases from the sediments, and using models will help extrapolate into the future and how the system will respond to climate change.

  • Link the processes impacting iron in shelf waters with physical models and radionuclide estimates of the movement of water off shelf to give new estimates of the size of this source to the ocean. This information will have implications for shelf break and ocean productivity.

  • Help interpret existing collected data (sediment profile images) on organic carbon within sediments and the status of the seabed through specific studies of sediment iron geochemistry. Specific studies of sediment iron geochemistry will help better interpret presently collected data (sediment profile images) on organic carbon within sediments and status of the seabed.

Fieldwork and data collection

Data for Work Package 3 will be gathered on all process cruises. These are listed in the table below. The study area is the marine shelf (and shelf-edge) of the Celtic Sea. Work will be carried out on board the NERC research vessels RRS Discovery and RRS James Cook.

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

Activities will include iron and radium measurements, glider work, coring, CTDs, stand alone pumps (SAPS), incubations with sediments and sea water.


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2014-03-21
End Date (yyyy-mm-dd) 2014-03-21
Organization Undertaking ActivityNational Oceanography Centre, Southampton
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierDY008_UCCTD_004
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for DY008_UCCTD_004

Sample reference number Nominal collection volume(l) Bottle rosette position Bottle firing sequence number Minimum pressure sampled (dbar) Maximum pressure sampled (dbar) Depth of sampling point (m) Bottle type Sample quality flag Bottle reference Comments
886160   10.00 6 19   11.70   12.70   11.20 Teflon-coated Niskin bottle No problem reported 6T  
886163   10.00 20 20   11.60   12.60   11.10 Teflon-coated Niskin bottle No problem reported 20T  
886166   10.00 21 21   11.80   12.80   11.30 Teflon-coated Niskin bottle No problem reported 21T  
886169   10.00 22 22   11.40   12.40   10.90 Teflon-coated Niskin bottle No problem reported 22T  
886172   10.00 23 23   11.00   12.00   10.50 Teflon-coated Niskin bottle No problem reported 23T  
886175   10.00 24 24   10.60   11.60   10.10 Teflon-coated Niskin bottle No problem reported 24T  
886631   10.00 1 1   91.40   92.40   90.20 Teflon-coated Niskin bottle No problem reported 1T  
886634   10.00 2 2   91.60   92.60   90.40 Teflon-coated Niskin bottle No problem reported 2T  
886637   10.00 7 3   91.90   92.90   90.70 Teflon-coated Niskin bottle No problem reported 7T  
886640   10.00 8 4   91.50   92.50   90.30 Teflon-coated Niskin bottle No problem reported 8T  
886643   10.00 9 5   92.60   93.60   91.40 Teflon-coated Niskin bottle No problem reported 9T  
886646   10.00 10 6   92.60   93.60   91.40 Teflon-coated Niskin bottle No problem reported 10T  
886649   10.00 11 7   91.20   92.20   90.00 Teflon-coated Niskin bottle No problem reported 11T  
886652   10.00 3 8   71.40   72.40   70.40 Teflon-coated Niskin bottle No problem reported 3T  
886655   10.00 12 9   72.40   73.40   71.40 Teflon-coated Niskin bottle No problem reported 12T  
886658   10.00 13 10   71.20   72.20   70.20 Teflon-coated Niskin bottle No problem reported 13T  
886661   10.00 14 11   71.30   72.30   70.30 Teflon-coated Niskin bottle No problem reported 14T  
886664   10.00 15 12   71.60   72.60   70.60 Teflon-coated Niskin bottle No problem reported 15T  
886667   10.00 4 13   41.80   42.80   41.00 Teflon-coated Niskin bottle No problem reported 4T  
886670   10.00 16 14   42.50   43.50   41.70 Teflon-coated Niskin bottle No problem reported 16T  
886673   10.00 17 15   42.50   43.50   41.70 Teflon-coated Niskin bottle No problem reported 17T  
886676   10.00 18 16   42.70   43.70   41.90 Teflon-coated Niskin bottle No problem reported 18T  
886679   10.00 19 17   41.90   42.90   41.10 Teflon-coated Niskin bottle No problem reported 19T  
886682   10.00 5 18   10.20   11.20    9.70 Teflon-coated Niskin bottle No problem reported 5T  

Please note:the supplied parameters may not have been sampled from all the bottle firings described in the table above. Cross-match the Sample Reference Number above against the SAMPRFNM value in the data file to identify the relevant metadata.

Related Data Activity activities are detailed in Appendix 1

Cruise

Cruise Name DY008
Departure Date 2014-03-18
Arrival Date 2014-04-13
Principal Scientist(s)Henry Ruhl (National Oceanography Centre, Southampton)
Ship RRS Discovery

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameShelf Seas Biogeochemistry Fixed Station East of Celtic Deep
CategoryOffshore area
Latitude51° 7.47' N
Longitude6° 9.52' W
Water depth below MSL103.0 m

Shelf Seas Biogeochemistry Fixed Station East of Celtic Deep

This station is one of four mooring sites located on the continental shelf of the Celtic Sea and maintained during the Shelf Seas Biogeochemistry project. The station has a mean water depth 103 m at the following co-ordinates:

Box Corner Latitude Longitude
North-west corner 51.1281° -6.1662°
South-east corner 51.1210° -6.1510°

The position of this station relative to the other Shelf Seas Biogeochemistry sites can be seen from the figure below.

BODC image

Sampling History

DY008 JC105 DY026 DY018
CTD casts 2 1 2 -
STD casts - 1 - -

Mooring deployments

Latitude Longitude Water depth (m) Moored instrument Deployment date Recovery date Deployment cruise Recovery cruise Comments
51.1237° -6.163° 103 Cefas mini-lander 21-03-2014 14:05 UTC 22-10-2014 10:35 UTC DY008 RV Cefas Endeavour 22/14 Recovery was abandoned during JC105, however was successfully recovered four months later by the RV Cefas Endeavour
51.1281° -6.1557° 101 Cefas mini-lander 18-06-2014 13:52 UTC - JC105 - Mini-lander was lost at sea

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:

Flag Description
Blank Unqualified
< Below detection limit
> In excess of quoted value
A Taxonomic flag for affinis (aff.)
B Beginning of CTD Down/Up Cast
C Taxonomic flag for confer (cf.)
D Thermometric depth
E End of CTD Down/Up Cast
G Non-taxonomic biological characteristic uncertainty
H Extrapolated value
I Taxonomic flag for single species (sp.)
K Improbable value - unknown quality control source
L Improbable value - originator's quality control
M Improbable value - BODC quality control
N Null value
O Improbable value - user quality control
P Trace/calm
Q Indeterminate
R Replacement value
S Estimated value
T Interpolated value
U Uncalibrated
W Control value
X Excessive difference

SeaDataNet Quality Control Flags

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

Flag Description
0 no quality control
1 good value
2 probably good value
3 probably bad value
4 bad value
5 changed value
6 value below detection
7 value in excess
8 interpolated value
9 missing value
A value phenomenon uncertain
B nominal value
Q value below limit of quantification

Appendix 1: DY008_UCCTD_004

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.

Series IdentifierData CategoryStart date/timeStart positionCruise
2117493Water sample data2014-03-21 16:04:3051.121 N, 6.16624 WRRS Discovery DY008
1336606Water sample data2014-03-21 16:05:0051.121 N, 6.16624 WRRS Discovery DY008

Appendix 2: Shelf Seas Biogeochemistry Fixed Station East of Celtic Deep

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.

Series IdentifierData CategoryStart date/timeStart positionCruise
1371468CTD or STD cast2014-03-21 15:18:0051.121 N, 6.1662 WRRS Discovery DY008
1371481CTD or STD cast2014-03-21 15:56:0051.121 N, 6.16623 WRRS Discovery DY008
2117493Water sample data2014-03-21 16:04:3051.121 N, 6.16624 WRRS Discovery DY008
1336606Water sample data2014-03-21 16:05:0051.121 N, 6.16624 WRRS Discovery DY008
1372712CTD or STD cast2014-06-18 08:11:0051.12173 N, 6.15963 WRRS James Cook JC105
2103817Water sample data2014-06-18 08:18:3051.12173 N, 6.1597 WRRS James Cook JC105
2108072Water sample data2014-06-18 08:18:3051.12173 N, 6.1597 WRRS James Cook JC105
2143082Water sample data2014-06-18 08:18:3051.12173 N, 6.1597 WRRS James Cook JC105
1372724CTD or STD cast2014-06-18 14:28:0051.12733 N, 6.15393 WRRS James Cook JC105
2103829Water sample data2014-06-18 14:29:3051.12736 N, 6.15397 WRRS James Cook JC105
2108084Water sample data2014-06-18 14:29:3051.12736 N, 6.15397 WRRS James Cook JC105
2143094Water sample data2014-06-18 14:29:3051.12736 N, 6.15397 WRRS James Cook JC105
1373358CTD or STD cast2014-08-18 07:30:0051.12518 N, 6.15097 WRRS Discovery DY026B
2127788Water sample data2014-08-18 07:39:3051.12519 N, 6.15095 WRRS Discovery DY026B