Metadata Report for BODC Series Reference Number 1266336
Metadata Summary
Problem Reports
Data Access Policy
Narrative Documents
Project Information
Data Activity or Cruise Information
Fixed Station Information
BODC Quality Flags
SeaDataNet Quality Flags
Metadata Summary
Data Description |
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Data Identifiers |
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Time Co-ordinates(UT) |
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Spatial Co-ordinates | |||||||||||||||||||||||||||||||||||||
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Parameters |
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Definition of BOTTFLAG | |||||||||||||||||||||||||||||||||||||
BOTTFLAG | Definition |
---|---|
0 | The sampling event occurred without any incident being reported to BODC. |
1 | The filter in an in-situ sampling pump physically ruptured during sample resulting in an unquantifiable loss of sampled material. |
2 | Analytical 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. |
3 | The 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. |
4 | During 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. |
5 | Water was reported to be escaping from the bottle as the rosette was being recovered. |
6 | The bottle seals were observed to be incorrectly seated and the bottle was only part full of water on recovery. |
7 | Either 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). |
8 | There is reason to doubt the accuracy of the sampling depth associated with the sample. |
9 | The bottle air vent had not been closed prior to deployment giving rise to a risk of sample contamination through leakage. |
Definition of Rank |
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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
Technicap NOEX bottle
The Technicap NOEX water bottle was designed for oceanographic sampling. The bottle comprises a plastic tube with caps at each end and is deployed with the caps held open, then closed at the target depth. Multiple bottles can be deployed on a CTD frame rosette. Bottle capacity is variable, but normally several litres. The bottle was developed by Technicap in the 1990s but has been superseded by more recent models. There is no known source of support available for this sampler.
Nutrients for cruises Belgica BG9309, Charles Darwin CD86 and Pelagia PLG93 and PLG95B
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
Dr Wim Helder, NIOZ, Texel, the Netherlands.
Sampling strategy and methodology
Samples were taken from water bottles deployed on a CTD rosette and analysed at sea using a TRAACS 80 autoanalyser, usually within 4 hours of collection. Samples were stored in cool and dark conditions between collection and analysis.
On cruise Pelagia 93, the samples from the CTD rosette were analysed unfiltered. On Charles Darwin 86 and Pelagia 95, the samples were filtered through a 0.45 micron acrodisc filter to improve the quality of the ammonium results.
The following chemistries were used:
Ammonium: | Phenol method |
Phosphate: | Ammonium molybdate / ascorbic acid method |
Nitrate / nitrite: | Sulphanylamide / napthylethylenediamine method using a Cu/Cd coil (efficiency >98%) for reduction |
Silicate: | Ammonium molybdate / ascorbic acid method |
Samples were always analysed from the surface to the bottom to minimise the risk of cross-sample contamination.
Working standards were freshly prepared daily by diluting stock standards to the required concentration with natural, aged, low-nutrient seawater. The nutrient concentrations in this were determined by manual colorometric analysis. The low-nutrient seawater was also used as a wash between samples. A second mixed nutrient stock, poisoned with 0.2% chloroform or 20 mg/l HgCl2, was used as an independent check. Pipettes and volumetric flasks were calibrated before each cruise and standard batches were intercalibrated.
Accuracy of analyses is reported as about 1% of the full scale value for nitrate, nitrite and silicate and 2% of the full scale for phosphate and ammonium.
The data were reported as nitrate and nitrite, the nitrate values having been computed by subtracting nitrite from nitrate plus nitrite. BODC practice is to store nitrate plus nitrite and the values in the database have been determined by summing the nitrate and nitrite values supplied. In cases where multiple bottles were fired at a single depth, nutrient values were reported from each bottle. These have been averaged, excluding any bottles flagged as leaking, to give a single nutrient value for each depth.
Comments on data quality
Belgica 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.
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) | 1993-10-26 |
End Date (yyyy-mm-dd) | 1993-10-26 |
Organization Undertaking Activity | Royal Netherlands Institute for Sea Research |
Country of Organization | Netherlands |
Originator's Data Activity Identifier | PLG93_CTD_CP11 |
Platform Category | lowered unmanned submersible |
BODC Sample Metadata Report for PLG93_CTD_CP11
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 |
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551701 | 12.00 | 2.30 | 3.80 | 3.00 | Technicap NOEX bottle | No problem reported | ||||
551702 | 12.00 | 128.80 | 130.30 | 128.40 | Technicap NOEX bottle | No problem reported | ||||
551703 | 12.00 | 161.30 | 162.80 | 160.60 | Technicap NOEX bottle | No problem reported | ||||
551704 | 12.00 | 194.30 | 195.80 | 193.30 | Technicap NOEX 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 | PE093 |
Departure Date | 1993-10-13 |
Arrival Date | 1993-10-31 |
Principal Scientist(s) | Wim Helder (Royal Netherlands Institute for Sea Research) |
Ship | RV Pelagia |
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 |
B | nominal value |
Q | value below limit of quantification |
Appendix 1: PLG93_CTD_CP11
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 Identifier | Data Category | Start date/time | Start position | Cruise |
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1637477 | Water sample data | 1993-10-26 09:14:00 | 49.483 N, 11.1328 W | RV Pelagia PE093 |