Metadata Report for BODC Series Reference Number 1712909


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 Ms Sophie Richier
Originating Organization National Oceanography Centre, Southampton
Processing Status banked
Project(s) UKOARP_ThemeB
 

Data Identifiers

Originator's Identifier D366_CTD_PIGX_3215:D366007
BODC Series Reference 1712909
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2011-06-08 05:06
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 56.79483 N ( 56° 47.7' N )
Longitude 7.40611 W ( 7° 24.4' W )
Positional Uncertainty Unspecified
Minimum Sensor Depth 4.8 m
Maximum Sensor Depth 69.4 m
Minimum Sensor Height 106.1 m
Maximum Sensor Height 170.7 m
Sea Floor Depth 175.5 m
Sensor Distribution Unspecified -
Sensor Depth Datum Unspecified -
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
 

Parameters

BODC CODE Rank Units Short Title Title
ADEPZZ01 1 Metres DepBelowSurf Depth below surface of the water body
BOTTFLAG 1 Dimensionless C22_flag Sampling process quality flag (BODC C22)
CPHLFLP1 1 Milligrams per cubic metre chl-a_water>GF/F_fluor Concentration 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
FIRSEQID 1 Dimensionless FireSeqNo Bottle firing sequence number
ROSPOSID 1 Dimensionless RosPos Bottle rosette position identifier
SAMPRFNM 1 Dimensionless SampRef Sample reference number
SCHLFLPO 1 Milligrams per cubic metre chl-a_water>10um_fluor Concentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >10um phase] by filtration, acetone extraction and fluorometry
 

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

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.

UKOA D366 chlorophyll-a (total and size-fractionated) concentrations from CTD bottle samples

Originator's Protocol for Data Acquisition and Analysis

Aliquots of 100-200 mL from 5-8 depths were filtered onto 25 mm Glass Fibre (GF/F) filters, 5µm or 10µm pore size polycarbonate filters (to yield a total, >5µm and >10µm size fraction, respectively and therefore by difference a <5 and <10 µm size fraction). All filters were extracted in 90% acetone for 24 h, and chlorophyll-a quantified with a Turner Designs Trilogy fluorometer. Final chlorophyll a concentrations were obtained via dilutions of a solution of pure chlorophyll a (Sigma, UK) in 90% acetone and a solid standard.

Instrumentation Description

Turner Designs Trilogy fluorometer

BODC Data Processing Procedures

Data were submitted via email in an Excel spreadsheet archived under BODC's accession number SOC130148. Sample metadata (Date, CTD cast and depth) were checked against information held in the database. There were a couple of minor depth discrepancies - for cast 35 samples were provided with depths 80 m and 50 m, the logsheets indicate these should be 8 m and 5 m respectively.

The concentration data were provided in micrograms per litre. These units are equivalent to the BODC parameter code units (milligrams per cubic metre) and no unit conversion was applied.

The data were reformatted and loaded in BODC's samples database under Oracle Relational Database Management System. Data were marked up with BODC parameter codes and loaded into the database.

A parameter mapping table is provided below;

Originator's Parameter Units Description BODC Parameter Code Units Comments
Chl-a (total) µg l -1 Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and fluorometry CPHLFLP1 mg m -3 n/a
Chl-a (>5) µg l -1 Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate >5µm phase] by filtration, acetone extraction and fluorometry SCHLFLPA mg m -3 n/a
Chl-a (>10) µg l -1 Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate >10µm phase] by filtration, acetone extraction and fluorometry SCHLFLPO mg m -3 n/a
Chl-a (<5) µg l -1 Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate GF/F-5µm phase] by filtration, acetone extraction and fluorometry SCHLFLPM mg m -3 n/a

Data Quality Report

There were no comments provided on the data quality.

Problem Report

Not relevant to this data set.


Project Information

UKOARP Theme B: Ocean acidification impacts on sea surface biology, biogeochemistry and climate

The overall aim of this theme is to obtain a quantitative understanding of the impact of ocean acidification (OA) on the surface ocean biology and ecosystem and on the role of the surface ocean within the overall Earth System.

The aims of the theme are:

The main consortium activities will consist of in-situ measurements on three dedicated cruises, as well as on-deck bioassay experiments probing the response of the in-situ community to elevated CO2. Most of the planned work will be carried out on the three cruises to locations with strong gradients in seawater carbon chemistry and pH; the Arctic Ocean, around the British Isles and the Southern Ocean.

Weblink: http://www.oceanacidification.org.uk/research_programme/surface_ocean.aspx


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2011-06-08
End Date (yyyy-mm-dd) Ongoing
Organization Undertaking ActivityUniversity of Southampton School of Ocean and Earth Science
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierD366_CTD_D366007
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for D366_CTD_D366007

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
621965   20.00 1 1  162.30  163.20  160.50 Niskin bottle No problem reported    
621968   20.00 2 2  131.00  131.60  129.30 Niskin bottle No problem reported    
621971   20.00 3 3  100.90  101.30   99.40 Niskin bottle No problem reported    
621974   20.00 4 4   70.40   71.10   69.40 Niskin bottle No problem reported    
621977   20.00 5 5   70.50   71.00   69.40 Niskin bottle No problem reported    
621980   20.00 6 6   45.50   45.80   44.50 Niskin bottle No problem reported    
621983   20.00 7 7   45.30   45.90   44.50 Niskin bottle No problem reported    
621986   20.00 8 8   38.30   38.50   37.30 Niskin bottle No problem reported    
621989   20.00 9 9   38.20   38.60   37.30 Niskin bottle No problem reported    
621992   20.00 10 10   30.30   30.50   29.40 Niskin bottle No problem reported    
621995   20.00 11 11   30.30   30.60   29.50 Niskin bottle No problem reported    
621998   20.00 12 12   30.20   30.50   29.40 Niskin bottle No problem reported    
622001   20.00 13 13   20.00   20.10   19.20 Niskin bottle Bottle leak    
622004   20.00 14 14   19.90   20.10   19.10 Niskin bottle No problem reported    
622007   20.00 15 15   13.60   14.10   13.00 Niskin bottle Bottle leak    
622010   20.00 16 16   13.50   14.10   13.00 Niskin bottle No problem reported    
622013   20.00 17 17    9.70   10.10    9.10 Niskin bottle No problem reported    
622016   20.00 18 18    9.80   10.10    9.10 Niskin bottle No problem reported    
622994   20.00 19 19    9.90   10.20    9.20 Niskin bottle No problem reported    
622997   20.00 20 20    5.40    5.80    4.80 Niskin bottle No problem reported    
623000   20.00 21 21    5.40    5.70    4.80 Niskin bottle No problem reported    
623003   20.00 22 22    5.30    5.80    4.80 Niskin bottle No problem reported    
623006   20.00 23 23    5.50    5.70    4.80 Niskin bottle No problem reported    
623009   20.00 24 24    5.50    5.70    4.80 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.

Other Series linked to this Data Activity - 1248692

Cruise

Cruise Name D366 (D367)
Departure Date 2011-06-06
Arrival Date 2011-07-09
Principal Scientist(s)Eric Pieter Achterberg (University of Southampton School of Ocean and Earth Science)
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