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Metadata Report for BODC Series Reference Number 1271535


Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
NameCategories
General Oceanics GO-FLO water sampler  discrete water samplers
Instrument Mounting lowered unmanned submersible
Originating Country Belgium
Originator Dr Marc Elskens
Originating Organization Free University of Brussels Laboratory of Analytical and Environmental Chemistry
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) OMEX I
 

Data Identifiers

Originator's Identifier BG9322A_CTD_NUTS_10:GC05B
BODC Series Reference 1271535
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1993-09-26 09:52
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 49.11844 N ( 49° 7.1' N )
Longitude 13.42365 W ( 13° 25.4' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 396.6 m
Maximum Sensor or Sampling Depth 1576.6 m
Minimum Sensor or Sampling Height -
Maximum Sensor or Sampling Height -
Sea Floor Depth -
Sea Floor Depth Source -
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)
NTRZAATX1Micromoles per litreConcentration of nitrate+nitrite {NO3+NO2} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis
PHOSAATX1Micromoles per litreConcentration of phosphate {PO43- CAS 14265-44-2} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis
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

GO-FLO Bottle

A water sampling bottle featuring close-open-close operation. The bottle opens automatically at approximately 10 metres and flushes until closed. Sampling with these bottles avoids contamination at the surface, internal spring contamination, loss of sample on deck and exchange of water from different depths.

There are several sizes available, from 1.7 to 100 litres and are made of PVC with a depth rating of up to 500 m. These bottles can be attached to a rosette or placed on a cable at selected positions.

Nutrients for cruises Belgica BG9309, BG9322, BG9412, BG9506, BG9521 and BG9522

Document History

Converted from CDROM documentation.

Content of data series

AMONAAD2 Dissolved ammonium
Colorometric autoanalysis (0.4/0.45 µm pore filtered)
Micromoles/litre
AMONAATX Dissolved ammonium
Colorometric autoanalysis (unfiltered)
Micromoles/litre
AMONMATX Ammonium (unfiltered)
Manual colorometric analysis (unfiltered)
Micromoles/litre
NTRIAAD2 Dissolved nitrite
Colorometric autoanalysis (0.4/0.45 µm pore filtered)
Micromoles/litre
NTRIAAD5 Dissolved nitrite
Colorometric autoanalysis (0.2 µm pore filtered)
Micromoles/litre
NTRIAATX Nitrite (unfiltered)
Colorometric autoanalysis (unfiltered)
Micromoles/litre
NTRZAAD2 Dissolved nitrate + nitrite
Colorometric autoanalysis (0.4/0.45 µm pore filtered)
Micromoles/litre
NTRZAAD5 Dissolved nitrate + nitrite
Colorometric autoanalysis (0.2 µm pore filtered)
Micromoles/litre
NTRZAATX Nitrate + nitrite (unfiltered)
Colorometric autoanalysis (unfiltered)
Micromoles/litre
PHOSAAD2 Dissolved phosphate
Colorometric autoanalysis (0.4/0.45 µm pore filtered)
Micromoles/litre
PHOSAAD5 Dissolved phosphate
Colorometric autoanalysis (0.2 µm pore filtered)
Micromoles/litre
PHOSAATX Phosphate (unfiltered)
Colorometric autoanalysis (unfiltered)
Micromoles/litre
PHOSMATX Phosphate (unfiltered)
Manual colorometric analysis (unfiltered)
Micromoles/litre
SLCAAAD2 Dissolved silicate
Colorometric autoanalysis (0.4/0.45 µm pore filtered)
Micromoles/litre
SLCAAAD5 Dissolved silicate
Colorometric autoanalysis (0.2 µm pore filtered)
Micromoles/litre
SLCAAATX Silicate (unfiltered)
Colorometric autoanalysis (unfiltered)
Micromoles/litre
SLCAMATX Silicate (unfiltered)
Manual colorometric analysis (unfiltered)
Micromoles/litre
UREAMDTX Urea (unfiltered)
Manual analysis using the diacetylmonoxime method
Micromoles/litre

Data Originator

Ir Marc Elskens, VUB, Brussels, Belgium.

Sampling strategy and methodology

Water samples were taken from manually filled bottles deployed from an inflatable boat away from Belgica (ria surveys) or taken from water bottles deployed on a CTD rosette. On two cruises (BG9322 and BG9412) continuous underway measurements were also made by drawing discrete samples at frequent intervals from the continuous seawater supply.

Nutrient determinations were carried out on board ship, immediately after sampling. Nitrate plus nitrite and phosphate were determined using a Technicon AA2 autoanalyser as described by Elskens and Elskens (1989).

Ammonia was determined according to the manual method using indophenol blue described in Koroleff (1969) using a Baush and Lomb Spectronic 21 spectrophotometer.

Urea was determined using the diacetymonoxime method of Mulvena and Savidge (1992) modified to allow precise analyses when strict control of the reaction temperature is impossible as described by Goeyens et al. (submitted 1996).

Comments on data quality

Belgica cruise BG9309

The SKALAR autoanalyser phosphate data were supplied with a warning that there may be problems. On a number of stations all three laboratories provided phosphates and for a number of stations there were also manually analysed phosphates from ULB. Comparing these data it can be clearly seen that the SKALAR values are frequently way too high. Consequently, the SKALAR phosphate data set has been flagged 'L'.

For the stations where inter-comparison of NO3+NO2 data is possible, the ULB data are generally higher than the VUB data which are, in turn, generally higher than the CSIC data. None of the data have been flagged. Users are advised to retrieve all three data sets and reach their own conclusions about which data to use.

Belgica cruise BG9412

On this cruise the ULB NO3+NO2 data, with the exception of a handful of points, are significantly lower than the VUB data. Differences of 10 per cent and more are predominant throughout the overlapping data set.

The phosphate and nitrite data sets show excellent agreement.

References

Armstrong, F.A.J., Stearns, C.R. and Strickland, J.D.H., 1967. The measurement of upwelling and subsequent biological processes by means of the Technicon Autoanalyser and associated equipment. Deep Sea Res. 14, 381-389.

Eberlein, K. and Kattner, G. 1987. Automatic method for the determination of ortho-phosphate and total dissolved phosphorus in the marine environment. Fresenius Z. anal. Chem., 326, 354-357.

Elskens, I. and Elskens, M., 1989. Handleing voor de bepaling van nutrienten in zeewater met an Autoanalyser IITM systeem. Vrije Universiteit Brussel, 50pp..

Føyn, L., Magnussen, M. and Seglem, K., 1981. Automatisk analyse av naeringsalter med "on-line" databehandling. En presentasjon av oppbyggning og virkemåte av systemet i bruk på Havforskningsinstituttets båter og i laboratoriet. Fisken Hav., Ser. B., 4, 1-40.

Goeyens, L,. Kindermans, N., Yusuf, M.A. and Elskens, M. (submitted 1996). A room temperature procedure for the manual determination of urea in seawater. Submitted to Marine Chemistry.

Grasshoff, K., Ehrhardt, M. and Kremling, K. eds. 1983. Methods of seawater analysis. Verlag Chemie.

Koroleff, F., 1969. Direct determination of ammonia in natural waters as indophenol blue. Int. Counc. Explor. Sea, CM., 9, 19-22.

Mourino, C. and Fraga, F., 1985. Determinacion de nitratos en aqua de mar. Investigacion Pesquera, 49, 81-96.

Mulvena, P. and Savidge, G., 1992. A modified manual method for the determination of urea in seawater using diacetylmonoxime reagent. Estuarine, Coastal and Shelf Science, 34, 429-438.

Murphy, J. and Riley, J.P., 1962. A modified single solution method for the determination of phosphate in natural waters. Analytica Chim. Acta, 27, 31-36.

Rees, A.P., Owens, N.J.P. and Woodward, E.M.S. (1995). Phytoplankton nitrogen assimilation at low nutrient concentrations in the NW Mediterranean Sea. Water Pollution Research Report 32 in EROS 2000 ed J-M Martin and H. Barth, European Commission, 141-148.


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) 1993-09-26
End Date (yyyy-mm-dd) 1993-09-26
Organization Undertaking ActivityFree University of Brussels, Laboratory of Chemical Oceanography and Water Geochemistry
Country of OrganizationBelgium
Originator's Data Activity IdentifierBG9322A_CTD_GC05B
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for BG9322A_CTD_GC05B

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
552058   10.00      400.00  401.60  396.60 General Oceanics GO-FLO water sampler No problem reported    
552060   10.00      598.20  599.70  592.60 General Oceanics GO-FLO water sampler No problem reported    
552062   10.00      898.80  900.30  889.60 General Oceanics GO-FLO water sampler No problem reported    
552064   10.00     1098.50 1100.00 1086.60 General Oceanics GO-FLO water sampler No problem reported    
552066   10.00     1198.90 1200.40 1185.60 General Oceanics GO-FLO water sampler No problem reported    
552068   10.00     1595.80 1597.40 1576.60 General Oceanics GO-FLO water sampler 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.

Cruise

Cruise Name BG9322A
Departure Date 1993-09-22
Arrival Date 1993-09-29
Principal Scientist(s)Roland Wollast (Free University of Brussels, Laboratory of Chemical Oceanography and Water Geochemistry)
Ship RV Belgica

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameOMEX I site OMEX3
CategoryOffshore area
Latitude49° 5.28' N
Longitude13° 23.40' W
Water depth below MSL3670.0 m

OMEX I Moored Instrument and CTD site OMEX3

OMEX3 was one of four fixed stations for the OMEX I project. It was visited by eleven cruises and collected a variety of data during the period June 1993 to October 1995. These include:

  • Mooring deployments - Aandeera current meters with transmissometers
  • CTD casts
  • Net trawls
  • Plankton recorders
  • Cores
  • Water samples

The data collected a site OMEX3 lay within a box bounded by co-ordinates 48° 56.9'N, 013° 42.69'W at the southwest corner and 49° 6.5'N, 013° 17.1'W at the northeast corner, with an approximate depth of 3650 metres.

Related Fixed Station activities are detailed in Appendix 1


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: OMEX I site OMEX3

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
920613CTD or STD cast1993-06-26 06:08:0049.06933 N, 13.429 WFS Poseidon PO200_7
319408Currents -subsurface Eulerian1993-06-26 14:31:0049.0942 N, 13.4288 WFS Poseidon PO200_7
319433Currents -subsurface Eulerian1993-06-26 14:43:0049.0942 N, 13.4288 WFS Poseidon PO200_7
319421Currents -subsurface Eulerian1993-06-26 16:26:0049.0942 N, 13.4288 WFS Poseidon PO200_7
920268CTD or STD cast1993-06-30 01:23:0049.003 N, 13.497 WValdivia VLD137
920281CTD or STD cast1993-06-30 03:09:0049.015 N, 13.519 WValdivia VLD137
883871CTD or STD cast1993-09-26 06:12:0049.08983 N, 13.37367 WRV Belgica BG9322A
883883CTD or STD cast1993-09-26 09:08:0049.1185 N, 13.42367 WRV Belgica BG9322A
883895CTD or STD cast1993-09-26 15:28:0049.12883 N, 13.43617 WRV Belgica BG9322A
883902CTD or STD cast1993-09-26 18:36:0049.14583 N, 13.482 WRV Belgica BG9322A
1271560Water sample data1993-09-26 18:46:0049.14583 N, 13.48192 WRV Belgica BG9322A
914877CTD or STD cast1993-10-24 09:14:0049.08333 N, 13.43 WRV Pelagia PE093
908177CTD or STD cast1994-01-07 05:16:0049.07333 N, 13.415 WFS Meteor M27_1
908189CTD or STD cast1994-01-07 21:22:0049.05667 N, 13.40833 WFS Meteor M27_1
908190CTD or STD cast1994-01-08 04:17:0049.08167 N, 13.43 WFS Meteor M27_1
444345Currents -subsurface Eulerian1994-01-08 07:34:0049.0942 N, 13.41 WFS Meteor M27_1
444357Currents -subsurface Eulerian1994-01-08 07:37:0049.0942 N, 13.41 WFS Meteor M27_1
444333Currents -subsurface Eulerian1994-01-08 07:39:0049.0942 N, 13.41 WFS Meteor M27_1
908208CTD or STD cast1994-01-08 08:00:0049.08 N, 13.435 WFS Meteor M27_1
887491CTD or STD cast1994-04-30 02:24:0049.0845 N, 13.30117 WRRS Charles Darwin CD85
887429CTD or STD cast1994-04-30 03:09:0049.08983 N, 13.3 WRRS Charles Darwin CD85
1663785Water sample data1994-05-29 08:37:0049.08648 N, 13.43338 WRRS Charles Darwin CD86
974008CTD or STD cast1994-05-29 09:51:0049.0865 N, 13.43333 WRRS Charles Darwin CD86
910342CTD or STD cast1994-09-14 18:58:0049.09083 N, 13.41133 WFS Meteor M30_1
442953Currents -subsurface Eulerian1994-09-15 09:30:0049.0883 N, 13.39 WFS Meteor M30_1
442977Currents -subsurface Eulerian1994-09-15 10:08:0049.0883 N, 13.39 WFS Meteor M30_1
442965Currents -subsurface Eulerian1994-09-15 14:35:0049.0883 N, 13.39 WFS Meteor M30_1
915021CTD or STD cast1995-08-23 06:10:0049.08317 N, 13.43067 WRV Pelagia PE95A
886463CTD or STD cast1995-09-30 05:45:0049.084 N, 13.4195 WRRS Discovery D217
1676267Water sample data1995-09-30 06:23:0049.08403 N, 13.41943 WRRS Discovery D217
886395CTD or STD cast1995-10-06 09:27:0049.091 N, 13.38417 WRRS Discovery D217
1676311Water sample data1995-10-06 11:18:0049.09093 N, 13.38417 WRRS Discovery D217
886402CTD or STD cast1995-10-06 14:00:0049.08067 N, 13.4025 WRRS Discovery D217
1676323Water sample data1995-10-06 14:15:0049.08059 N, 13.40249 WRRS Discovery D217
886414CTD or STD cast1995-10-07 05:01:0049.07717 N, 13.38917 WRRS Discovery D217
886426CTD or STD cast1995-10-07 08:07:0049.0835 N, 13.41383 WRRS Discovery D217