Metadata Report for BODC Series Reference Number 1668765


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 Prof Raymond Pollard
Originating Organization James Rennell Centre for Ocean Circulation (now National Oceanography Centre, Southampton)
Processing Status banked
Project(s) WOCE
UK WOCE
 

Data Identifiers

Originator's Identifier CD58_CTD_PIGX_32:CTD11v08
BODC Series Reference 1668765
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1991-05-02 11:02
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 48.02348 N ( 48° 1.4' N )
Longitude 15.98573 W ( 15° 59.1' W )
Positional Uncertainty Unspecified
Minimum Sensor Depth 0.9 m
Maximum Sensor Depth 4331.6 m
Minimum Sensor Height -
Maximum Sensor Height -
Sea Floor Depth -
Sensor Distribution Unspecified -
Sensor Depth Datum Unspecified -
Sea Floor Depth Datum Unspecified -
 

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
PHAEFLP1 1 Milligrams per cubic metre Fluor_Phae_>GFF Concentration of phaeopigments {pheopigments} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and fluorometry
SAMPRFNM 1 Dimensionless SampRef Sample reference number
 

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

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

World Ocean Circulation Experiment (WOCE)

The World Ocean Circulation Experiment (WOCE) was a major international experiment which made measurements and undertook modelling studies of the deep oceans in order to provide a much improved understanding of the role of ocean circulation in changing and ameliorating the Earth's climate.

WOCE had two major goals:


UK WOCE

The UK made a substantial contribution to the international World Ocean Circulation Experiment (WOCE) project by focusing on two important regions:

  1. Southern Ocean - links all the worlds oceans, controlling global climate.
  2. North Atlantic - directly affects the climate of Europe.

A major part of the UK effort was in the Southern Ocean and work included:

In the North Atlantic the UK undertook:

Satellite ocean surface topography, temperature and wind data were merged with in situ observations and models to create a complete description of ocean circulation, eddy motion and the way the ocean is driven by the atmosphere.

The surveys were forerunners to the international Global Ocean Observing System (GOOS). GOOS was later established to monitor annual to decadal changes in ocean circulation and heat storage which are vital in the prediction of climate change.


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 1991-05-02
End Date (yyyy-mm-dd) 1991-05-02
Organization Undertaking ActivityJames Rennell Centre for Ocean Circulation (now National Oceanography Centre, Southampton)
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierCD58_CTD_CTD11v08
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for CD58_CTD_CTD11v08

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
1549   10.00       68.50   70.00   68.00 Niskin bottle No problem reported    
1550   10.00       28.80   30.30   28.70 Niskin bottle No problem reported    
1756   10.00     4413.50 4415.00 4331.60 Niskin bottle No problem reported    
1757   10.00     2805.20 2806.70 2763.30 Niskin bottle No problem reported    
1758   10.00     1405.10 1406.60 1388.70 Niskin bottle No problem reported    
1759   10.00      619.80  621.30  613.80 Niskin bottle No problem reported    
1760   10.00      168.70  170.20  167.30 Niskin bottle No problem reported    
1761   10.00         .80    2.30     .90 Niskin bottle No problem reported    
1960   10.00     3621.90 3623.40 3561.10 Niskin bottle No problem reported    
1961   10.00     3213.30 3214.80 3162.30 Niskin bottle No problem reported    
1963   10.00     2015.20 2016.70 1988.80 Niskin bottle No problem reported    
1965   10.00     1199.90 1201.40 1186.50 Niskin bottle No problem reported    
1966   10.00      999.80 1001.30  989.10 Niskin bottle No problem reported    
1967   10.00      813.80  815.30  805.50 Niskin bottle No problem reported    
1968   10.00      318.00  319.50  315.20 Niskin bottle No problem reported    
1969   10.00      218.30  219.80  216.50 Niskin bottle No problem reported    
1970   10.00      118.60  120.10  117.70 Niskin bottle No problem reported    
2521   10.00     4012.60 4014.10 3941.80 Niskin bottle No problem reported    
2522   10.00     1815.60 1817.10 1792.70 Niskin bottle No problem reported    
2531   10.00     2411.90 2413.40 2378.10 Niskin bottle No problem reported    
2532   10.00      418.20  419.70  414.40 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.

Other Series linked to this Data Activity - 1260144

Cruise

Cruise Name CD58
Departure Date 1991-04-25
Arrival Date 1991-05-16
Principal Scientist(s)Raymond T Pollard (James Rennell Centre for Ocean Circulation)
Ship RRS Charles Darwin

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