Metadata Report for BODC Series Reference Number 1248089

Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
Niskin bottle  discrete water samplers
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Mr Malcolm Woodward
Originating Organization Plymouth Marine Laboratory
Processing Status banked
Project(s) UKSOLAS

Data Identifiers

Originator's Identifier D338_CTD_NUTS_62:CTD_026
BODC Series Reference 1248089

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2009-04-24 09:19
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -

Spatial Co-ordinates

Latitude 20.96398 N ( 20° 57.8' N )
Longitude 17.47982 W ( 17° 28.8' W )
Positional Uncertainty Unspecified
Minimum Sensor Depth 2.3 m
Maximum Sensor Depth 82.9 m
Minimum Sensor Height 12.5 m
Maximum Sensor Height 93.1 m
Sea Floor Depth 95.4 m
Sensor Distribution Unspecified -
Sensor Depth Datum Unspecified -
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface


BODC CODE Rank Units Short Title Title
ADEPZZ01 1 Metres DepBelowSurf Depth below surface of the water body
AMONAATX 1 Micromoles per litre NH4_Unfilt_Col Concentration of ammonium {NH4+ CAS 14798-03-9} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis
BOTTFLAG 1 Dimensionless C22_flag Sampling process quality flag (BODC C22)
FIRSEQID 1 Dimensionless FireSeqNo Bottle firing sequence number
NTRIAATX 1 Micromoles per litre NO2_Unfilt_ColAA Concentration of nitrite {NO2- CAS 14797-65-0} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis
NTRZAATX 1 Micromoles per litre NO3+NO2_Unfilt_ColAA Concentration of nitrate+nitrite {NO3+NO2} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis
PHOSAATX 1 Micromoles per litre PO4_Unfilt_ColAA Concentration of phosphate {PO43- CAS 14265-44-2} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis
ROSPOSID 1 Dimensionless RosPos Bottle rosette position identifier
SAMPRFNM 1 Dimensionless SampRef Sample reference number
SLCAAATX 1 Micromoles per litre SiOx_Unfilt_ColAA Concentration of silicate {SiO44- CAS 17181-37-2} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis

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.


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.

Inorganic nutrients concentrations (micromolar sensitivity nitrate, nitrite, phosphate, silicate and ammonium) for UK SOLAS cruise Discovery D338 (ICON)

Originator's Data Acquisition and Analysis

Water samples were collected from 60 of the CTD deployments. The 20-litre CTD bottles were subsampled into acid washed 60 ml HDPE (Nalgene) bottles. Surface samples were also taken from the trace metal clean fish deployed over the starboard quarter whenever a mapping exercise of an upwelling filament was carried out. Hence nutrients surface mapping was not performed throughout the duration of the cruise.

Analysis for the nutrient samples was, in most cases, complete within 3-4 hours of sampling. No samples were stored. Analysis was conducted using a Bran and Luebbe AAIII segmented flow colorimetric autoanalyser. Clean handling techniques were employed to avoid any contamination of the samples, particularly ammonium.

BODC Data Processing Procedures

Nutrients data from CTD, underway and incubation sampling were received by BODC as one accession in three separate files: CTD_nutrients_ICON_09.xls,ICON_09_All_Underway_Final.xls, and ICON_09_All_Photo_OX_Final.xls. For profile data, the samples were identified by CTD cast number and approximate bottle firing depth. For underway data sample identifiers and date and time were provided.

Parameter codes defined in the BODC parameter dictionary were mapped to the variables as follows:

Originator's Parameter Units Description BODC Parameter Code Units Comments
Nitrite µmol 1 -1 Concentration of nitrite per unit volume of seawater NTRIAATX µmol l -1 none
Nitrite+Nitrate µmol l -1 Concentration of nitrate per unit volume of seawater NTRZAATX µmol l -1 none
Ammonium µmol l -1 Concentration of ammonium per unit volume of seawater AMONAATX µmol l -1 none
Silicate µmol l -1 Concentration of silicate per unit volume of seawater SLCAAATX µmol l -1 none
Phosphate µmol l -1 Concentration of phosphate per unit volume of seawater PHOSAATX µmol l -1 none

The data were banked according to BODC standard procedures for sample data. The data were banked as received, with no averaging or other modifications applied.

Data Quality Report

The quality and accuracy of the analyses of nitrate, phosphate and silicate were checked by the originator using reference materials supplied by Dr Michio Aoyama from the KANSO company in Japan. These reference materials are close to being globally certified and the exercise was part of a global initiative for a nutrient intercomparability study.

Data values which were indicated as below detection limit or suspect by the originator have been flagged using the appropriate flag in the BODC quality flag scheme.

Project Information

UK Surface Ocean Lower Atmosphere Study

The UK Surface Ocean Lower Atmosphere Study (UK SOLAS) is the UK's contribution to the international SOLAS programme.

UK SOLAS formed interdisciplinary teams to address three primary aims

UK SOLAS started in 2003, to run for seven years. The programme was funded by the Natural Environment Research Council.

Funded projects

In total, 19 projects have been funded by UK SOLAS, over four funding rounds.

Project Title Short Title Principal Investigator
Impact of atmospheric dust derived material and nutrient inputs on near-surface plankton microbiota in the tropical North Atlantic Dust Eric Achterberg
The role and effects of photoprotective compounds in marine plankton - Steve Archer
Field observations of sea spray, gas fluxes and whitecaps SEASAW Ian Brooks
Factors influencing the biogeochemistry of iodine in the marine environment - Lucy Carpenter
Global model of aerosol processes - effects of aerosol in the marine atmospheric boundary layer GLOMAP Ken Carslaw
Ecological controls on fluxes of dimethyl sulphide (DMS) to the atmosphere - David Green
Dust outflow and deposition to the ocean DODO Ellie Highwood
Investigation of near surface production of iodocarbons - rates and exchanges INSPIRE Gill Malin
Reactive halogens in the marine boundary layer RHaMBLe Gordon McFiggans
The role of bacterioneuston in determining trace gas exchange rates - Colin Murrell
Measuring methanol in sea water and investigating its sources and sinks in the marine environment - Phil Nightingale
The impact of coastal upwellings on air-sea exchange of climatically important gases ICON Carol Robinson
The Deep Ocean Gas Exchange Experiment DOGEE Rob Upstill-Goddard
High wind air-sea exchanges HiWASE Margaret Yelland
Aerosol characterisation and modelling in the marine environment ACMME James Allan
3D simulation of dimethyl sulphide (DMS) in the north east Atlantic - Icarus Allen
Processes affecting the chemistry and bioavailability of dust borne iron - Michael Krom
The chemical structure of the lowermost atmosphere - Alastair Lewis
Factors influencing the oxidative chemistry of the marine boundary layer - Paul Monks

UK SOLAS has also supported ten tied studentships, and two CASE studentships.


UK SOLAS fieldwork has included eight dedicated research cruises in the North Atlantic Ocean. Continuous measurements were made aboard aboard the Norwegian weather ship, Polarfront, until her decommission in 2009. Time series have been established at the SOLAS Cape Verde Observatory, and at the Plymouth Marine Laboratory L4 station. Experiments have taken place at the Bergen mesocosm facility.

A series of collaborative aircraft campaigns have added complementary atmospheric data. These campaigns were funded by UK SOLAS, African Monsoon Multidisciplinary Analyses (AMMA-UK), Dust and Biomass Experiment (DABEX) and the Facility for Airborne Atmospheric Measurements (FAAM).


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2009-04-24
End Date (yyyy-mm-dd) 2009-04-24
Organization Undertaking ActivityUniversity of East Anglia School of Environmental Sciences
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierD338_CTD_CTD_026
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for D338_CTD_CTD_026

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
205920   20.00 1 1   83.30   83.60   82.90 Niskin bottle No problem reported    
205921   10.00 2 2   83.20   83.60   82.90 Niskin bottle No problem reported    
205922   20.00 3 3   83.20   83.60   82.90 Niskin bottle No problem reported    
205923   20.00 4 4   63.50   64.00   63.30 Niskin bottle No problem reported    
205924   20.00 5 5   63.50   63.80   63.20 Niskin bottle No problem reported    
205925   20.00 6 6   48.30   48.50   48.10 Niskin bottle No problem reported    
205926   20.00 7 7   38.20   38.50   38.10 Niskin bottle No problem reported    
205927   20.00 8 8   38.30   38.60   38.20 Niskin bottle No problem reported    
205928   20.00 9 9   38.10   38.60   38.10 Niskin bottle No problem reported    
205929   20.00 10 10   38.30   38.60   38.20 Niskin bottle No problem reported    
205930   20.00 11 11   28.30   28.50   28.20 Niskin bottle No problem reported    
205931   20.00 12 12   28.00   28.60   28.10 Niskin bottle No problem reported    
205932   20.00 13 13   18.10   18.30   18.10 Niskin bottle No problem reported    
205933   20.00 14 14   18.10   18.40   18.10 Niskin bottle No problem reported    
205934   20.00 15 15   18.20   18.40   18.20 Niskin bottle No problem reported    
205935   20.00 16 16   11.10   11.50   11.20 Niskin bottle No problem reported    
205936   20.00 17 17   11.10   11.50   11.20 Niskin bottle No problem reported    
205937   20.00 18 18    8.10    8.50    8.20 Niskin bottle No problem reported    
205938   10.00 19 19    8.10    8.40    8.20 Niskin bottle No problem reported    
205939   20.00 20 20    8.00    8.40    8.10 Niskin bottle No problem reported    
205940   20.00 21 21    2.20    2.70    2.40 Niskin bottle No problem reported    
205941   20.00 22 22    2.30    2.70    2.50 Niskin bottle No problem reported    
205942   20.00 23 23    2.20    2.50    2.30 Niskin bottle No problem reported    
205943   20.00 24 24    2.20    2.80    2.50 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.


No Cruise Information Available for this Series

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