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Metadata Report for BODC Series Reference Number 1691288


Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
NameCategories
Niskin bottle  discrete water samplers
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Dr Ian Joint
Originating Organization Plymouth Marine Laboratory
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) OMEX I
 

Data Identifiers

Originator's Identifier DI217_CTD_PIGX_3:12837-5
BODC Series Reference 1691288
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1995-10-20 04:55
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 49.40440 N ( 49° 24.3' N )
Longitude 11.52840 W ( 11° 31.7' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth 3.9 m
Maximum Sensor or Sampling Depth 48.8 m
Minimum Sensor or Sampling Height 619.0 m
Maximum Sensor or Sampling Height 663.9 m
Sea Floor Depth 667.8 m
Sea Floor Depth Source -
Sensor or Sampling Distribution Unspecified -
Sensor or Sampling Depth Datum Unspecified -
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
 

Parameters

BODC CODERankUnitsTitle
ADEPZZ011MetresDepth (spatial coordinate) relative to water surface in the water body
BOTTFLAG1Not applicableSampling process quality flag (BODC C22)
CPHLFLP41Milligrams per cubic metreConcentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >0.2um phase] by filtration, acetone extraction and fluorometry and summation of size-fractionated values
CPHLSPP11Milligrams per cubic metreConcentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and spectrophotometry and processing following the Lorenzen protocol
PHAEFLP41Milligrams per cubic metreConcentration of phaeopigments {pheopigments} per unit volume of the water body [particulate >0.2um phase] by filtration, acetone extraction and fluorometry and summation of size-fractionated values
PHAESPP11Milligrams per cubic metreConcentration of phaeopigments {pheopigments} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and spectrophotometry and processing following the Lorenzen protocol
SAMPRFNM1DimensionlessSample reference number
SCHLFLPA1Milligrams per cubic metreConcentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >5um phase] by filtration, acetone extraction and fluorometry
SCHLFLPC1Milligrams per cubic metreConcentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate 2-5um phase] by filtration, acetone extraction and fluorometry
SCHLFLPF1Milligrams per cubic metreConcentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate 0.2-2um phase] by filtration, acetone extraction and fluorometry
SPHAFLPA1Milligrams per cubic metreConcentration of phaeopigments {pheopigments} per unit volume of the water body [particulate >5um phase] by filtration, acetone extraction and fluorometry
SPHAFLPC1Milligrams per cubic metreConcentration of phaeopigments {pheopigments} per unit volume of the water body [particulate 2-5um phase] by filtration, acetone extraction and fluorometry
SPHAFLPF1Milligrams per cubic metreConcentration of phaeopigments {pheopigments} per unit volume of the water body [particulate 0.2-2um phase] by filtration, acetone extraction and fluorometry

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

Public domain 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.

The recommended acknowledgment is

"This study uses data from the data source/organisation/programme, provided by the British Oceanographic Data Centre and funded by the funding body."


Narrative Documents

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 have a capacity between 1.7 and 30 L, while Lever Action bottles have a capacity between 1.7 and 12 L. Reversing thermometers may be attached to a spring-loaded disk that rotates through 180° on bottle closure.

Pigments for cruises Charles Darwin CD85, RRS Discovery DI217 and Valdivia VLD137

Document History

Converted from CDROM documentation.

Content of data series

ACARHPP1 Alpha-carotene
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
ALLOHPP1 Alloxanthin
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
BCARHPP1 Beta-carotene
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
BUTAHPP1 Butanoyloxyfucoxanthin
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
C1C2HPP1 Chlorophyll-c1c2
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
CAROSSP1 Spectrophotometric carotenoid pigments (SCOR)
Spectrophotometric assay of acetone extraction (GF/F filtered)
milligrams/cubic metre
CHLBHPP1 Chlorophyll-b
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
CHLBSSP1 Spectrophotometric chlorophyll-b (SCOR)
Spectrophotometric assay of acetone extraction (GF/F filtered)
Nanograms per litre
CHLCSSP1 Spectrophotometric chlorophyll-c (SCOR)
Spectrophotometric assay of acetone extraction (GF/F filtered)
Nanograms per litre
CLC3HPP1 Chlorophyll-c3
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
CLPHHPP1 Chlorophyll-a plus phaeophorbides
HPLC assay of acetone extract (GF/F filtered)
milligrams/cubic metre
CPHLFLP1 Fluorometric chlorophyll-a
Fluorometric assay of acetone extract (GF/F filtered)
Milligrams/cubic metre
CPHLFLP4 Fluorometric chlorophyll-a
Fluorometric assay of acetone extraction (sum of size fractions >0.2 microns)
Milligrams/cubic metre
CPHLFMP1 Fluorometric chlorophyll-a
Fluorometric assay of methanol extract (GF/F filtered)
Milligrams/cubic metre
CPHLHPP1 HPLC chlorophyll-a
HPLC assay of acetone extract (GF/F filtered)
Milligrams/cubic metre
CPHLPR01 CTD chlorophyll
Calibrated in-situ fluorometer
Milligrams/cubic metre
CPHLPRTX Bench fluorometer chlorophyll
Bench fluorometer measurement on unfiltered water sample
Milligrams/cubic metre
CPHLSPP1 Spectrophotometric chlorophyll-a (Lorenzen)
Spectrophotometric assay of acetone extraction (GF/F filtered)
Milligrams/cubic metre
CPHLSSP1 Spectrophotometric chlorophyll-a (SCOR)
Spectrophotometric assay of acetone extraction (GF/F filtered)
Milligrams/cubic metre
CPHLSSPC Spectrophotometric chlorophyll-a (SCOR)
Spectrophotometric assay of acetone extraction (centrifuged)
Milligrams/cubic metre
DIADHPP1 Diadinoxanthin
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
DVCAHPP1 Diavinyl chlorophyll-a
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
FUCXHPP1 Fucoxanthin
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
HEXOHPP1 Hexanoyloxyfucoxanthin
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
LUTNHPP1 Lutein
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
PBA1HPP1 Phaeophorbide-a1
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
PBA2HPP1 Phaeophorbide-a2
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
PBA3HPP1 Phaeophorbide-a3
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
PERIHPP1 Peridinin
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
PHAEFLP1 Fluorometric phaeopigments
Fluorometric assay of acetone extract (GF/F filtered)
Milligrams/cubic metre
PHAEFLP4 Fluorometric phaeopigments
Fluorometric assay of acetone extract (sum of size fractions >0.2 microns)
Milligrams/cubic metre
PHAEFMP1 Fluorometric phaeopigments
Fluorometric assay of methanol extract (GF/F filtered)
Milligrams/cubic metre
PHAESPP1 Spectrophotometric phaeopigments (Lorenzen)
Spectrophotometric assay of acetone extract (GF/F filtered)
Milligrams/cubic metre
PTA1HPP1 Phaeophytin-a1
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
PTA2HPP1 Phaeophytin-a2
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre
SCHLFLPA Size-fractionated fluorometric chlorophyll-a
Fluorometric assay of acetone extract (>5 micron size fraction)
Milligrams/cubic metre
SCHLFLPB Size-fractionated fluorometric chlorophyll-a
Fluorometric assay of acetone extract (>2 micron size fraction)
Milligrams/cubic metre
SCHLFLPC Size-fractionated fluorometric chlorophyll-a
Fluorometric assay of acetone extract (2-5 micron size fraction)
Milligrams/cubic metre
SCHLFLPF Size-fractionated fluorometric chlorophyll-a
Fluorometric assay of acetone extract (0.2-2 micron size fraction)
Milligrams/cubic metre
SPHAFLPA Size-fractionated phaeopigments
Fluorometric assay of acetone extract (>5 micron size fraction)
Milligrams/cubic metre
SPHAFLPB Size-fractionated phaeopigments
Fluorometric assay of acetone extract (>2 micron size fraction)
Milligrams/cubic metre
SPHAFLPC Size-fractionated phaeopigments
Fluorometric assay of acetone extract (0.2-2 micron size fraction)
Milligrams/cubic metre
SPHAFLPF Size-fractionated phaeopigments
Fluorometric assay of acetone extract (>2 micron size fraction)
Milligrams/cubic metre
TCPEFLP1 Total chloroplastic pigment
Fluorometric assay of acetone extract (GF/F filtered)
Milligrams/cubic metre
ZEOXHPP1 Zeoxantin
HPLC assay of acetone extract (GF/F filtered)
Nanograms per litre

Data Originator

Dr Ian Joint, Plymouth Marine Laboratory, UK.

Sampling strategy and methodology

Samples were taken from CTD rosette Niskin bottles, GoFlo bottles deployed on a hydrographic (kevlar) wire or from the continuous pumped seawater supply.

Samples taken for chlorophyll determinations (1-2 litres) were filtered through Whatman GF/F filters. The filters were quickly frozen and returned, continuously frozen, to the laboratory for analysis. Back at the laboratory, the samples were extracted in 90% acetone for approximately 12 hours in the dark at 4 °C. In most cases the resulting extract was assayed spectrophotometrically for chlorophyll a and phaeopigments following the procedures outlined in Lorenzen and Jeffrey (1978). On Discovery 217, the extracts were assayed both spectrophotometrically and fluorometrically.

Additional samples were analysed for chlorophyll as part of the size-fractionated production experiments. Aliquots of 100-200 ml were filtered through a cascade of membrane filters (the pore sizes may be determined from the parameter codes). Usually, they were immediately extracted into 90% acetone and assayed fluorometrically on board ship but on occasions the filters were frozen and returned to the laboratory for analysis. The sums of the individual size fraction values have been computed and included in the database.

Comments on data quality

Cruise Discovery DI217

The CTD pressure sensor gave rise to problems during this cruise and for the first three stations only wire out data were available. Whilst every effort has been made to correct the pressure channel and accurately match bottle firing pressures, the possibility for error should be borne in mind by users of the data.

References

Barlow, R.G., Mantoura, R.F.C., Gough, M.A. and Fileman, T.W., 1993a. Pigment signatures of the phytoplankton composition in the north-east Atlantic during the 1990 spring bloom. Deep Sea Res. II, 40, 459-477.

Barlow, R.G., Mantoura, R.F.C., Gough, M.A. and Fileman, T.W., 1993b. Phaeopigment distribution during the 1990 spring bloom in the north-east Atlantic. Deep Sea Res. I, 40, 2229-2242.

Barlow, R.G., Cummings, D.G., Mantoura, R.F.C. and Fileman, T.W., 1996. Pigment chemotaxonomic distributions of phytoplankton during summer in the western Mediterranean. Deep Sea Res. II, in press.

Holm-Hansen, O., Lorenzen, C.J., Holmes, R.W. and Strictland, J.D.H., 1965. Fluorometric determination of chlorophyll. J. Con. perm. int. Explor. 30, 3-15.

Jeffrey, S.W. and Humphrey, G.F., 1975. New spectrophotometric equations for determining chlorophylls a, b, c1 and c2 in higher plants, algae and natural phytoplankton. Biochem. Physiol. Pflan., 167, 191-194.

Lorenzen, C.J., 1967. Determination of chlorophyll and phaeopigments: spectrophotometric equations. Limnology and Oceanography, 12.

Lorenzen, C.J. and Jeffrey, S.W., 1978. Determination of chlorophyll in seawater. UNESCO Techn. Paper Mar Sci, 35.

Strickland, J.D.H., Parsons, T.R. (1972). A practical handbook of seawater analysis. Fish. Res. Bd. Can.,.167-311.

Tahey, T.M., Duineveld, G.C.A., Berghuis, E.M. and Helder, W., 1994. Relation between sediment-water fluxes of oxygen and silicate and faunal abundance at continental shelf, slope and deep-water stations in the North West Mediterranean. Marine Ecology Progress Series, 104, 119-130.

Thomsen. L., Graf, G., Martens, V. and Steen, E., 1994. An instrument for sampling water from the bottom nepheloid layer. Contin. Shelf Res., 14, 871-882.

Thomsen, L. and Graf, G., 1995. Benthic boundary layer characteristics of the continental margin of the western Barents Sea. Oceanologica Acta, 17/6, 597-607.

Wright, S.W., Jeffrey, S.W., Mantoura, R.F.C., Llewellyn, C.A., Bjornland, T., Repeta, D. and Welschmeyer, N., 1991. Improved HPLC method for the analysis of chlorophylls and carotenoids from marine phytoplankton. Marine Ecology Progress Series, 77, 183-196.


Project Information

Ocean Margin EXchange (OMEX) I

Introduction

OMEX was a European multidisciplinary oceanographic research project that studied and quantified the exchange processes of carbon and associated elements between the continental shelf of western Europe and the open Atlantic Ocean. The project ran in two phases known as OMEX I (1993-1996) and OMEX II - II (1997-2000), with a bridging phase OMEX II - I (1996-1997). The project was supported by the European Union under the second and third phases of its MArine Science and Technology Programme (MAST) through contracts MAS2-CT93-0069 and MAS3-CT97-0076. It was led by Professor Roland Wollast from Université Libre de Bruxelles, Belgium and involved more than 100 scientists from 10 European countries.

Scientific Objectives

The aim of the Ocean Margin EXchange (OMEX) project was to gain a better understanding of the physical, chemical and biological processes occurring at the ocean margins in order to quantify fluxes of energy and matter (carbon, nutrients and other trace elements) across this boundary. The research culminated in the development of quantitative budgets for the areas studied using an approach based on both field measurements and modeling.

OMEX I (1993-1996)

The first phase of OMEX was divided into sub-projects by discipline:

  • Physics
  • Biogeochemical Cycles
  • Biological Processes
  • Benthic Processes
  • Carbon Cycling and Biogases

This emphasises the multidisciplinary nature of the research.

The project fieldwork focussed on the region of the European Margin adjacent to the Goban Spur (off the coast of Brittany) and the shelf break off Tromsø, Norway. However, there was also data collected off the Iberian Margin and to the west of Ireland. In all a total of 57 research cruises (excluding 295 Continuous Plankton Recorder tows) were involved in the collection of OMEX I data.

Data Availability

Field data collected during OMEX I have been published by BODC as a CD-ROM product, entitled:

  • OMEX I Project Data Set (two discs)

Further descriptions of this product and order forms may be found on the BODC web site.

The data are also held in BODC's databases and subsets may be obtained by request from BODC.


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 1995-10-20
End Date (yyyy-mm-dd) 1995-10-20
Organization Undertaking ActivitySouthampton Oceanography Centre (now National Oceanography Centre, Southampton)
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierDI217_CTD_12837-5
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for DI217_CTD_12837-5

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
557146   10.00        4.30    5.80    3.90 Niskin bottle No problem reported    
557147   10.00        9.40   10.90    8.90 Niskin bottle No problem reported    
557148   10.00       19.40   20.90   18.80 Niskin bottle No problem reported    
557149   10.00       29.50   31.00   28.90 Niskin bottle No problem reported    
557150   10.00       39.50   41.00   38.80 Niskin bottle No problem reported    
557151   10.00       49.60   51.10   48.80 Niskin bottle No problem reported    
557152   10.00       74.70   76.20   73.70 Niskin bottle No problem reported    
557275   10.00       14.40   15.90   13.90 Niskin bottle No problem reported    
557276   10.00       24.40   25.90   23.80 Niskin bottle No problem reported    
557367   10.00      646.90  648.40  640.00 Niskin bottle No problem reported    
557368   10.00      401.90  403.40  397.70 Niskin bottle No problem reported    
557369   10.00      150.20  151.70  148.50 Niskin bottle No problem reported    
557370   10.00      120.00  121.50  118.60 Niskin bottle No problem reported    
557719   10.00       99.90  101.40   98.60 Niskin bottle No problem reported    

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 D217
Departure Date 1995-09-27
Arrival Date 1995-10-22
Principal Scientist(s)Richard Stephen Lampitt (Southampton Oceanography Centre)
Ship RRS Discovery

Complete Cruise Metadata Report is available here


Fixed Station Information


No Fixed Station Information held for the Series


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
Q value below limit of quantification

Appendix 1: DI217_CTD_12837-5

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
1302763Water sample data1995-10-20 04:55:0049.4044 N, 11.5284 WRRS Discovery D217
1676396Water sample data1995-10-20 04:55:0049.4044 N, 11.5284 WRRS Discovery D217