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Metadata Report for BODC Series Reference Number 1659092


Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
NameCategories
Niskin bottle  discrete water samplers
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Unknown
Originating Organization Plankton Reactivity in the Marine Environment Project Office
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) -
 

Data Identifiers

Originator's Identifier DI221_CTD_PIGX_127:CTD15
BODC Series Reference 1659092
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1996-06-22 14:02
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 59.08495 N ( 59° 5.1' N )
Longitude 20.02957 W ( 20° 1.8' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth 2.4 m
Maximum Sensor or Sampling Depth 298.7 m
Minimum Sensor or Sampling Height 2485.1 m
Maximum Sensor or Sampling Height 2781.4 m
Sea Floor Depth 2783.8 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)
CPHLFLP51Milligrams per cubic metreConcentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >0.2um phase] by filtration, acetone extraction and fluorometry
PHAEFLPZ1Milligrams per cubic metreConcentration of phaeopigments {pheopigments} per unit volume of the water body [particulate >unknown phase] by filtration, acetone extraction and fluorometry
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

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

Pigments as part of the PRIME project

Parameter Code Definitions

CPHLFLP1 Fluorometric chlorophyll-a µg/litre
Fluorometric assay of acetone extract (GF/F filtered)
CPHLFLP2 Fluorometric chlorophyll-a µg/litre
Fluorometric assay of acetone extract (0.4/0.45 µm pore filtered)
CPHLFLP5 Fluorometric chlorophyll-a µg/litre
Fluorometric assay of acetone extract (0.2 µm pore filtered)
CPHLPR01 In-situ fluorometer chlorophyll µg/litre
Calibrated in-situ fluorometer
CPHLZZXX Chlorophyll-a µg/litre
Unspecified methodology
PHAEFLP1 Fluorometric phaeopigments µg/litre
Fluorometric assay of acetone extract (GF/F filtered)
PHAEFLPZ Fluorometric phaeopigments µg/litre
Fluorometric assay of acetone extract (filter unspecified)
SCHLFLPA Size-fractionated fluorometric chlorophyll-a µg/litre
Fluorometric assay of acetone extract (>5 µm fraction)
SCHLFLPC Size-fractionated fluorometric chlorophyll-a µg/litre
Fluorometric assay of acetone extract (2-5 µm fraction)
SCHLFLPD Size-fractionated fluorometric chlorophyll-a µg/litre
Fluorometric assay of acetone extract (1-5 µm fraction)
SCHLFLPL Size-fractionated fluorometric chlorophyll-a µg/litre
Fluorometric assay of acetone extract (GF/F-20 µm fraction)

Originator Code Definitions

2 Dr. Duncan Purdie Southampton Oceanography Centre
16 British Oceanographic Data Centre
36 Dr. Roger Harris CCMS Plymouth Marine Laboratory
39 Mr. Bob Head CCMS Plymouth Marine Laboratory
127 PRIME Project Office
136 Dr. Graeme Hays University of Wales, Swansea

Originator Protocols

Mr. Bob Head and Dr. Roger Harris

Samples (100 ml) were taken from the non-toxic supply and filtered, either through GF/F or pore filters for the size-fractionated work. Pigments were extracted on board ship using 90% acetone and assayed fluorometrically before and after the addition of acid on a Turner 111 bench fluorometer. The fluorometer was calibrated using known concentrations of chlorophyll a standard in 90% acetone.

Dr. Duncan Purdie

Samples of 1-2 litres were filtered, extracted into 10 ml acetone for 24-72 hours and assayed on a Turner bench fluorometer.

British Oceanographic Data Centre

Calibrated fluorometer values from the CTD downcasts at depths corresponding to the bottle firings have been determined by BODC and stored in the database. A Chelsea Instruments Aquatracka fluorometer was used, calibrated against fluorometric chlorophyll a data by BODC.

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 have a capacity between 1.7 and 30 L, while Lever Action bottles have a capacity between 1.7 and 12 L. Reversing thermometers may be attached to a spring-loaded disk that rotates through 180° on bottle closure.


Project Information


No Project Information held for the Series

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 1996-06-22
End Date (yyyy-mm-dd) 1996-06-22
Organization Undertaking ActivityQueen's University Belfast School of Biological Sciences
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierDI221_CTD_CTD15
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for DI221_CTD_CTD15

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
116478   10.00      302.70  303.60  298.70 Niskin bottle No problem reported    
116479   10.00      202.10  203.70  199.60 Niskin bottle No problem reported    
116480   10.00      151.00  152.90  149.10 Niskin bottle No problem reported    
116481   10.00      125.50  127.30  123.80 Niskin bottle No problem reported    
116482   10.00      100.90  101.50   98.90 Niskin bottle No problem reported    
116483   10.00       74.50   75.70   73.00 Niskin bottle No problem reported    
116484   10.00       50.40   51.20   49.00 Niskin bottle No problem reported    
116485   10.00       40.80   41.70   39.50 Niskin bottle No problem reported    
116486   10.00       30.10   30.60   28.70 Niskin bottle No problem reported    
116487   10.00       20.70   21.00   19.30 Niskin bottle No problem reported    
116488   10.00        9.70   10.10    8.50 Niskin bottle No problem reported    
116489   10.00        3.50    4.00    2.40 Niskin bottle 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 D221
Departure Date 1996-06-11
Arrival Date 1996-07-23
Principal Scientist(s)Graham Savidge (Queen's University Belfast School of Biological Sciences)
Ship RRS Discovery

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: DI221_CTD_CTD15

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
1302855Water sample data1996-06-22 14:02:0059.08495 N, 20.02957 WRRS Discovery D221
1667320Water sample data1996-06-22 14:02:0059.08495 N, 20.02957 WRRS Discovery D221
1669560Water sample data1996-06-22 14:02:0059.08495 N, 20.02957 WRRS Discovery D221