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Metadata Report for BODC Series Reference Number 1667725


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 George Slesser
Originating Organization Fisheries Research Services Aberdeen Marine Laboratory (now Marine Scotland Aberdeen Marine Laboratory)
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) -
 

Data Identifiers

Originator's Identifier 0508S_CTD_PIGX_483:305
BODC Series Reference 1667725
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2008-05-21 17:32
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 57.52967 N ( 57° 31.8' N )
Longitude 12.63433 W ( 12° 38.1' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth 4.9 m
Maximum Sensor or Sampling Depth 1610.7 m
Minimum Sensor or Sampling Height 28.3 m
Maximum Sensor or Sampling Height 1634.1 m
Sea Floor Depth 1639.0 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
BOTTFLAG1Not applicableSampling process quality flag (BODC C22)
CPHLFLP11Milligrams per cubic metreConcentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and fluorometry
FIRSEQID1DimensionlessBottle firing sequence number
PHEOPH011Micrograms per litreConcentration of phaeophytin-a {pheophytin-a CAS 603-17-8} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and fluorometry
ROSPOSID1DimensionlessBottle rosette position identifier
SAMPRFNM1DimensionlessSample reference number

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

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

0508S: Discrete Dissolved Inorganic Nutrients Sampling Document

Data originator

Dr George Slesser, Marine Laboratory (MARLAB), Marine Scotland.

Originator's Protocol for Data Acquisition and Analysis

Discrete water samples were taken from Niskin bottles attached to the CTD frame used during the cruise. Bottles were triggered whilst the CTD package was descending through the water column on each cast.

Analysis was performed on unfiltered samples whilst onboard, typically within 10 hours of sample collection. Nutrient concentrations were determined colorimetrically using a QuAAtro autoanalyser. Calibration was carried out relative to stock solutions of nitrite, nitrate and phosphate. Silicate calibration utilised lab-prepared stock solutions. The full methods for nutrient analysis were supplied to BODC by the data originator.

BODC processing

Nutrient samples collected at Extended Ellett Line stations during the cruise were supplied to BODC in an Excel spreadsheet. The nutrient concentrations were supplied together with the approximate (pre-allocated) sampling depths. The raw Sea-Bird files were also supplied. These were used to regenerate bottle firing (.btl) files which could be used to determine precise sampling depths. Nutrient values were merged with the associated information harvested from the Sea-Bird files and loaded to BODC's Oracle relational database.

Contents of data series

Originator variable Originator units Description BODC parameter code BODC units Comments
NO3 µg-at/l Concentration of nitrate+nitrite NTRZAATX µmol/l No unit conversion required
PO4 µg-at/l Concentration of phosphate PHOSAATX µmol/l No unit conversion required
Si µg-at/l Concentration of silicate SLCAAATX µmol/l No unit conversion required
NH3 µg-at/l Concentration of ammonia AMONAATX µmol/l No unit conversion required

Project Information


No Project Information held for the Series

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2008-05-21
End Date (yyyy-mm-dd) Ongoing
Organization Undertaking ActivityFisheries Research Services Aberdeen Marine Laboratory (now Marine Scotland Aberdeen Marine Laboratory)
Country of OrganizationUnited Kingdom
Originator's Data Activity Identifier0508S_CTD_305
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for 0508S_CTD_305

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
200487   1 1    4.00    5.80    4.90 unknown No problem reported    
200488   2 2  101.40  102.30  100.90 unknown No problem reported    
200489   3 3  201.40  202.80  200.10 unknown No problem reported    
200490   4 4  402.20  402.90  398.40 unknown No problem reported    
200491   5 5  501.20  503.10  496.90 unknown No problem reported    
200492   6 6  600.80  601.10  594.50 unknown No problem reported    
200493   7 7  800.70  801.50  792.20 unknown No problem reported    
200494   8 8  898.70  899.60  888.90 unknown No problem reported    
200495   9 9 1002.00 1002.70  990.70 unknown No problem reported    
200496   10 10 1251.70 1252.60 1236.90 unknown No problem reported    
200497   11 11 1500.80 1502.10 1482.30 unknown No problem reported    
200498   12 12 1630.90 1633.20 1610.70 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.

Related Data Activity activities are detailed in Appendix 1

Cruise

Cruise Name 0508S
Departure Date 2008-05-06
Arrival Date 2008-05-25
Principal Scientist(s)George Slesser (Fisheries Research Services Aberdeen Marine Laboratory)
Ship FRV Scotia

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

Appendix 1: 0508S_CTD_305

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 IdentifierData CategoryStart date/timeStart positionCruise
1616805Water sample data2008-05-21 17:32:0057.52967 N, 12.63433 WFRV Scotia 0508S