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Metadata Report for BODC Series Reference Number 1686330


Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
NameCategories
Niskin bottle  discrete water samplers
Instrument Mounting lowered unmanned submersible
Originating Country Belgium
Originator Dr Patrick Dauby
Originating Organization University of Liège Department of Ecophysiology and Animal Physiology
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) OMEX I
 

Data Identifiers

Originator's Identifier BG9521_CTD_PIGX_30:06A
BODC Series Reference 1686330
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1995-09-17 08:05
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 47.46934 N ( 47° 28.2' N )
Longitude 7.23294 W ( 7° 14.0' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth 3.4 m
Maximum Sensor or Sampling Depth 38.8 m
Minimum Sensor or Sampling Height 1514.3 m
Maximum Sensor or Sampling Height 1549.7 m
Sea Floor Depth 1553.1 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)
CAROSSP11Milligrams per cubic metreConcentration of carotenoid pigments per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and spectrophotometry and processed following SCOR protocol
CHLBSSP11Nanograms per litreConcentration of chlorophyll-b {chl-b CAS 519-62-0} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and trichromatic spectrophotometry following the Jeffrey and Humphrey protocol
CHLCSSP11Nanograms per litreConcentration of chlorophyll-c {chl-c} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and trichromatic spectrophotometry following the Jeffrey and Humphrey protocol
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
CPHLSSP11Milligrams 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 trichromatic spectrophotometry following the Jeffrey and Humphrey protocol
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

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 Belgica BG9309, BG9322, BG9412, BG94ZB, BG9506, BG9521 and BG9522

Document History

Converted from CDROM documentation.

Data Originator

Dr Patrick Dauby, University of Liege, Belgium.

Sampling strategy and methodology

Water samples were taken from CTD rosette bottles or the continuously pumped surface seawater supply. To provide pigment data to accompany the centrifuged samples, water samples were taken regularly from the centrifuge input and the results averaged (pigment parameter codes ending in 'PC').

Between 0.5 and 5 litres of water were passed through a GF/F filter which was then frozen. Pigments were subsequently extracted and assayed spectrophotometrically. The data were determined both as chlorophyll a, chlorophyll b, chlorophyll c and carotenoids using the SCOR equation (Strickland and Parsons, 1972) and chlorophyll a and phaeopigment using the equations of Lorenzen and Jeffrey (1978).

All data were supplied to BODC in units of µg/l (equivalent to mg/m3) but the chlorophyll b and chlorophyll c were converted to ng/l to conform with the database standard units.

References

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.


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) 1995-09-17
End Date (yyyy-mm-dd) 1995-09-17
Organization Undertaking ActivityUniversity of Liège Department of Astrophysics Geophysics and Oceanography
Country of OrganizationBelgium
Originator's Data Activity IdentifierBG9521_CTD_06A
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for BG9521_CTD_06A

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
558220   10.00        3.10    4.60    3.40 Niskin bottle No problem reported    
558221   10.00       38.80   40.30   38.80 Niskin bottle No problem reported    
558222   10.00       98.40  100.00   97.90 Niskin bottle No problem reported    
558223   10.00      150.00  151.50  149.00 Niskin bottle No problem reported    
558224   10.00      252.00  253.50  250.00 Niskin bottle No problem reported    
558225   10.00      402.50  404.00  399.00 Niskin bottle No problem reported    
558226   10.00      505.50  507.10  501.00 Niskin bottle No problem reported    
558227   10.00      605.60  607.20  600.00 Niskin bottle No problem reported    
558228   10.00      706.80  708.30  700.00 Niskin bottle No problem reported    
558229   10.00      808.00  809.50  800.00 Niskin bottle No problem reported    
558230   10.00      908.30  909.80  899.00 Niskin bottle No problem reported    
558231   10.00     1010.60 1012.10 1000.00 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 BG9521
Departure Date 1995-09-11
Arrival Date 1995-09-19
Principal Scientist(s)Michel Frankignoulle (University of Liège Department of Astrophysics Geophysics and Oceanography)
Ship RV Belgica

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: BG9521_CTD_06A

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
1272422Water sample data1995-09-17 08:05:0047.46934 N, 7.23294 WRV Belgica BG9521
1652591Water sample data1995-09-17 08:05:0047.46934 N, 7.23294 WRV Belgica BG9521