Metadata Report for BODC Series Reference Number 1267481
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 |
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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
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 and Lever Action bottles have a capacity between 1.7 and 30 L. Reversing thermometers may be attached to a spring-loaded disk that rotates through 180° on bottle closure.
Nutrients for cruises Belgica BG9309 and Madorniña MD0994, MD0495, MD0695, MD0795, MD0995, MD1095 and MD1195
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 Ricardo Prego Reboredo, IIM, CSIC, Vigo, Spain.
Sampling strategy and methodology
Nitrate plus nitrite was determined using a Technicon AAII autoanalyser with the adaptation described in Mouriño and Fraga (1985). Phosphate and silicate were determined using a Technicon AAI autoanalyser following the method described by Hansen and Grasshoff in Grasshoff et al. (1983).
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
No Project Information held for the Series
Data Activity or Cruise Information
Cruise
Cruise Name | BG9309 |
Departure Date | 1993-04-19 |
Arrival Date | 1993-05-06 |
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
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 |
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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 |