Metadata Report for BODC Series Reference Number 1362490
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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Time Co-ordinates(UT) |
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Parameters |
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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
Non-toxic (underway) sea water supply
A source of uncontaminated near-surface (commonly 3 to 7 m) seawater pumped continuously to shipboard laboratories on research vessels. There is typically a temperature sensor near the intake (known as the hull temperature) to provide measurements that are as close as possible to the ambient water temperature. The flow from the supply is typically directed through continuously logged sensors such as a thermosalinograph and a fluorometer. Water samples are often collected from the non-toxic supply. The system is also referred to as the underway supply.
Nutrients for cruise Poseidon PS211
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 Ludger Mintrop, IfM Kiel, Germany.
Sampling strategy and methodology
Water samples were taken from the ship's 'moon pool' and immediately frozen. The samples were transferred to the Polarstern and analysed several months after collection using standard photometric methods on a four channel autoanalyser.
Nitrate and nitrite were supplied as separate channels. These were summed by BODC to give the nitrate+nitrite channel stored.
Comments on data quality
A small number of the nutrient values were obviously anomalously high for oceanic surface sea water. Nitrites in excess of 0.5 µM (plus the associated nitrate+nitrite values), phosphates in excess of 1.5 µM and silicates in excess of 5 µM were flagged suspect. This affected between 1 and 4 data values in each channel.
There is, however, some concern about the remaining data, particularly the silicates and, to a lesser extent, the nitrate+nitrite channel. The pattern of the data is more uneven than one would expect for surface values, particularly in the lower nutrient waters encountered south of 52 ° N. Users are advised to examine the data carefully and make their own judgements on whether further data should be rejected before making use of this data set.
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
Cruise
Cruise Name | PO211 |
Departure Date | 1995-08-31 |
Arrival Date | 1995-09-11 |
Principal Scientist(s) | Ludger Mintrop (Institute of Marine Sciences, Kiel) |
Ship | FS Poseidon |
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 |