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Metadata Report for BODC Series Reference Number 1354293


Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
NameCategories
unknown  unknown
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Mr Tim Brand
Originating Organization Scottish Association for Marine Science
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) -
 

Data Identifiers

Originator's Identifier PO300_2_CTD_NUTS_304:P300_CTD034
BODC Series Reference 1354293
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2003-07-25 15:42
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 56.66970 N ( 56° 40.2' N )
Longitude 6.13537 W ( 6° 8.1' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 49.2 m
Minimum Sensor or Sampling Height 99.8 m
Maximum Sensor or Sampling Height 144.0 m
Sea Floor Depth 149.0 m
Sea Floor Depth Source -
Sensor or Sampling Distribution Unspecified -
Sensor or Sampling Depth Datum Unspecified -
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
 

Parameters

BODC CODERankUnitsTitle
ADEPZZ011MetresDepth (spatial coordinate) relative to water surface in the water body
AMONAAD11Micromoles per litreConcentration of ammonium {NH4+ CAS 14798-03-9} per unit volume of the water body [dissolved plus reactive particulate
BOTTFLAG1Not applicableSampling process quality flag (BODC C22)
FIRSEQID1DimensionlessBottle firing sequence number
NTRAAAD11Micromoles per litreConcentration of nitrate {NO3- CAS 14797-55-8} per unit volume of the water body [dissolved plus reactive particulate
NTRASD031Micromoles per litreConcentration standard deviation of nitrate {NO3- CAS 14797-55-8} per unit volume of the water body [dissolved plus reactive particulate
NTRIAAD11Micromoles per litreConcentration of nitrite {NO2- CAS 14797-65-0} per unit volume of the water body [dissolved plus reactive particulate
PHOSAAD11Micromoles per litreConcentration of phosphate {PO43- CAS 14265-44-2} per unit volume of the water body [dissolved plus reactive particulate
SAMPRFNM1DimensionlessSample reference number
SDAMAAD11Micromoles per litreConcentration standard deviation of ammonium {NH4+ CAS 14798-03-9} per unit volume of the water body [dissolved plus reactive particulate
SDNIAAD11Micromoles per litreConcentration standard deviation of nitrite {NO2- CAS 14797-65-0} per unit volume of the water body [dissolved plus reactive particulate
SDPHAAD11Micromoles per litreConcentration standard deviation of phosphate {PO43- CAS 14265-44-2} per unit volume of the water body [dissolved plus reactive particulate
SDSLAAD11Micromoles per litreConcentration standard deviation of silicate {SiO44- CAS 17181-37-2} per unit volume of the water body [dissolved plus reactive particulate
SLCAAAD11Micromoles per litreConcentration of silicate {SiO44- CAS 17181-37-2} per unit volume of the water body [dissolved plus reactive particulate

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

Open Data supplied by Natural Environment Research Council (NERC)

You must always use the following attribution statement to acknowledge the source of the information: "Contains data supplied by Natural Environment Research Council."


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 ActivityScottish Association for Marine Science
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierPO300_2_CTD_P300_CTD034
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for PO300_2_CTD_P300_CTD034

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
191564     1   49.50   49.70   49.10 unknown No problem reported    
191565     2   49.60   49.80   49.20 unknown No problem reported    
191566     3   30.30   30.40   30.10 unknown No problem reported    
191567     4   30.40   30.50   30.10 unknown No problem reported    
191568     5   19.80   19.80   19.60 unknown No problem reported    
191569     6   19.60   19.90   19.60 unknown No problem reported    
191570     7    4.90    5.10    5.00 unknown No problem reported    
191571     8    4.90    5.00    4.90 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 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
Q value below limit of quantification