Metadata Report for BODC Series Reference Number 1354232
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 |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Data Identifiers |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Time Co-ordinates(UT) |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Spatial Co-ordinates | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Parameters |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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 |
|
|
Problem Reports
No Problem Report Found in the Database
Data Access Policy
Open 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.
If the Information Provider does not provide a specific attribution statement, or if you are using Information from several Information Providers and multiple attributions are not practical in your product or application, you may consider using the following:
"Contains public sector information licensed under the Open Government Licence v1.0."
Narrative Documents
PO300_2 discrete inorganic nutrient samples from CTD bottles
Data originator
Tim Brand, Scottish Association for Marine Science, UK
Cruise principal scientist
Colin R Griffiths, Scottish Association for Marine Science, UK
Originator's protocols
Cruise PO300_2 had various objectives, including an occupation of the Extended Ellett Line. The cruise sailed on the 19th July 2003 from Glasgow and returned there on the 6th August 2003, with a brief stop in Ullapool on 26th July 2003.
Water samples were collected from the CTD rosette into 2 litres polythene sample bottles. Up to 12 samples were taken from each cast. From these, subsamples were passed through 25 mm diameter Whatman GF/F filters and the filtrate collected in 250 ml acid-cleansed polythene bottles. These were immediately frozen for analysis back on land. Analysis was conducted using a Lachat Quik Chem 8000 flow injection autoanalyser, with triplicates of each sample run to establish instrumental precision. Standards were prepared using deionised water.
BODC processing
The data were provided to BODC in the form of an Excel workbook. The values contained within the spreadsheet were loaded to an ORACLE Relational Database. The originator did not always note the exact rosette bottle from which each sample was drawn (just the water depth). Where multiple bottles were fired at the same depth, samples were arbitrarily assigned to one of those rosette bottles. Matlab was used to enable some basic screening of the data to take place, with negative data values being flagged suspect.
SAMS nitrate data quality warning
SAMS have notified BODC of a problem in the analytical procedure adopted for nitrate analysis on this cruise. The problem relates to the technique used to prepare the analytical standards, which results in nitrate (and consequently nitrite) values which are typically 10-15 % higher than they should be. Absolute data values should therefore be used with extreme caution.
Contents of data series
Originator's variable | Originator's units | BODC Parameter code | BODC's units | Comment |
---|---|---|---|---|
Ammonium | µM | AMONAAD1 | µM | - |
Ammonium (standard deviation) | µM | SDAMAAD1 | µM | - |
Phosphate | µM | PHOSAAD1 | µM | - |
Phosphate (standard deviation) | µM | SDPHAAD1 | µM | - |
Silicate | µM | SLCAAAD1 | µM | - |
Silicate (standard deviation) | µM | SDSLAAD1 | µM | - |
Nitrate | µM | NTRAAAD1 | µM | This parameter represents the amount of nitrate measured alone. |
Nitrate (standard deviation) | µM | NTRASD03 | µM | This parameter represents the standard deviation of nitrate measured alone. |
Nitrite | µM | NTRIAAD1 | µM | - |
Nitrite (standard deviation) | µM | SDNIAAD1 | µM | - |
Note: BODC list values out of our database to a precision deemed appropiate to the analytical procedure adopted. This has resulted in several instances of zero values within the nitrate, nitrite and ammonium data for this cruise. Original values, as supplied by the originator, are preserved in our archive.
BODC Quality Control Flags
The following single character qualifying flags may be associated with one or more individual parameters within 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 |
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 |
Project Information
No Project Information held for the Series
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 2003-07-25 |
End Date (yyyy-mm-dd) | 2003-07-25 |
Organization Undertaking Activity | Scottish Association for Marine Science |
Country of Organization | United Kingdom |
Originator's Data Activity Identifier | PO300_2_CTD_P300_CTD025 |
Platform Category | lowered unmanned submersible |
BODC Sample Metadata Report for PO300_2_CTD_P300_CTD025
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 |
---|---|---|---|---|---|---|---|---|---|---|
191506 | 1 | 112.00 | 112.20 | 111.00 | unknown | No problem reported | ||||
191507 | 2 | 111.80 | 112.20 | 110.90 | unknown | No problem reported | ||||
191508 | 3 | 72.30 | 73.00 | 72.00 | unknown | No problem reported | ||||
191509 | 4 | 72.70 | 73.30 | 72.40 | unknown | No problem reported | ||||
191510 | 5 | 42.30 | 43.20 | 42.30 | unknown | No problem reported | ||||
191511 | 6 | 42.30 | 42.80 | 42.00 | unknown | No problem reported | ||||
191512 | 7 | 14.80 | 15.20 | 14.90 | unknown | No problem reported | ||||
191513 | 8 | 14.90 | 15.20 | 14.90 | unknown | No problem reported | ||||
191514 | 9 | 4.30 | 4.40 | 4.30 | unknown | No problem reported | ||||
191515 | 10 | 4.20 | 4.50 | 4.20 | unknown | 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 | PO300_2 |
Departure Date | 2003-07-19 |
Arrival Date | 2003-08-06 |
Principal Scientist(s) | Colin R Griffiths (Scottish Association for Marine Science) |
Ship | 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 |