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Metadata Report for BODC Series Reference Number 1874042


Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
NameCategories
Lever Action Niskin Bottle  discrete water samplers
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Prof Patrick Holligan
Originating Organization University of Southampton School of Ocean and Earth Science
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) Atlantic Meridional Transect Phase2(AMT)
 

Data Identifiers

Originator's Identifier AMT15_CTD_PIGX_216:CTD083t
BODC Series Reference 1874042
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2004-10-18 11:43
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 24.13152 S ( 24° 7.9' S )
Longitude 16.28376 W ( 16° 17.0' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 1.7 m
Maximum Sensor or Sampling Depth 150.7 m
Minimum Sensor or Sampling Height 3667.1 m
Maximum Sensor or Sampling Height 3816.1 m
Sea Floor Depth 3817.8 m
Sea Floor Depth Source PEVENT
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
ALLOHPP11Nanograms per litreConcentration of alloxanthin {CAS 28380-31-6} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)
BOTTFLAG1Not applicableSampling process quality flag (BODC C22)
BUTAHPP11Nanograms per litreConcentration of 19'-butanoyloxyfucoxanthin per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)
CHLBHPP11Nanograms per litreConcentration of chlorophyll-b {chl-b CAS 519-62-0} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)
CLC2HPP11Nanograms per litreConcentration of chlorophyll-c2 {chl-c2} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)
CLC3HPP11Nanograms per litreConcentration of chlorophyll-c3 {chl-c3} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)
CPHLHPP11Milligrams 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 high performance liquid chromatography (HPLC)
DIADHPP11Nanograms per litreConcentration of diadinoxanthin {CAS 18457-54-0} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)
DVCAHPP11Nanograms per litreConcentration of divinyl chlorophyll-a {DVchl-a} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)
FIRSEQID1DimensionlessBottle firing sequence number
FUCXHPP11Nanograms per litreConcentration of fucoxanthin {CAS 3351-86-8} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)
HEXOHPP11Nanograms per litreConcentration of 19'-hexanoyloxyfucoxanthin {CAS 60147-85-5} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)
LUTNHPP11Nanograms per litreConcentration of lutein {CAS 127-40-2} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)
PERIHPP11Nanograms per litreConcentration of peridinin {CAS 33281-81-1} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)
PRSXHPP11Nanograms per litreConcentration of prasinoxanthin {CAS 94705-97-2} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)
ROSPOSID1DimensionlessBottle rosette position identifier
SAMPRFNM1DimensionlessSample reference number
VILXHPP11Nanograms per litreConcentration of violaxanthin {CAS 126-29-4} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)
ZEOXHPP11Nanograms per litreConcentration of zeaxanthin {CAS 144-68-3} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)

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

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.

AMT15 pigment composition (HPLC)

Data Acquisition and Analysis

Samples from the five main light depths were collected from 35 casts during the cruise. Samples were taken from niskin bottles fired during the early morning cast and filtered through GF/F filters. The filters were then frozen until the samples were returned to the lab in the UK at the end of the cruise. HPLC analysis was carried out after Barlow et al. (1997).

References Cited

Barlow R.G. , Cummings D.G. and Gibb S.W., 1997. Improved resolution of mono- and divinyl chlorophylls a and b and zeaxanthin and lutein in phytoplankton extracts using reverse phase C8 HPLC. Marine Ecology Progress Series, 161 , 303-307.

Instrumentation Description

Section not relevant.

BODC Data Processing Procedures

Data were submitted to BODC in Microsoft Excel spreadsheet format and archived in accession SOC090128. The file was provided to BODC with cast number, date, sampling position (LAT and LON) and depth as metadata.

Sample metadata were checked against information held in the database - there were three discrepancies. In the data file the LAT figures had the decimal point in the wrong place. Also a number of samples were identified with two cast numbers in the file, these corresponded to stations where two casts were taken to collect water. The samples were matched to the cast where the range of depths provided in the file matched the depths sampled. Finally for cast 41 the range of depths sampled matched the bottle firing depths for cast 42, both these casts were carried out pre-dawn at the same station and so the data were linked to cast 42.

Parameter codes defined in BODC parameter dictionary were assigned to the variables as shown in the table below. Two additional parameters in the file were not loaded to the database: "Fluor Chl" had been supplied to BODC previously and already been loaded, the data were included by the data originator as part of the QC process; "Tot Chl a" was derived as the sum of "Divinyl chl a" and "Chl a" and so was not uploaded to the database. The data were provided in units that were consistent with those used for the relevant parameters in the BODC database, with the exception of "Chl a" where a unit conversion was applied from ng l-1 to mg m-3.

Data loaded into BODC's database without any changes.

Originator's Parameter Units Description BODC Parameter Code Units Comments
Chl c3 Nanograms per litre Concentration of chlorophyll-c3 {chl-c3} per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) CLC3HPP1 Nanograms per litre n/a
Chl c2 Nanograms per litre Concentration of chlorophyll-c2 {chl-c2} per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) CLC2HPP1 Nanograms per litre n/a
Peridinin Nanograms per litre Concentration of peridinin per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) PERIHPP1 Nanograms per litre n/a
19 But Nanograms per litre Concentration of 19'-butanoyloxyfucoxanthin per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) BUTAHPP1 Nanograms per litre n/a
Fucoxanthin Nanograms per litre Concentration of fucoxanthin per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) FUCXHPP1 Nanograms per litre n/a
19 Hex Nanograms per litre Concentration of 19'-hexanoyloxyfucoxanthin per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) HEXOHPP1 Nanograms per litre n/a
Prasinoxanthin Nanograms per litre Concentration of prasinoxanthin per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) PRSXHPP1 Nanograms per litre n/a
Violoxanthin Nanograms per litre Concentration of violaxanthin per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) VILXHPP1 Nanograms per litre n/a
Diadinoxanthin Nanograms per litre Concentration of diadinoxanthin per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) DIADHPP1 Nanograms per litre n/a
Alloxanthin Nanograms per litre Concentration of alloxanthin per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) ALLOHPP1 Nanograms per litre n/a
Zeaxanthin Nanograms per litre Concentration of zeaxanthin per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) ZEOXHPP1 Nanograms per litre n/a
Lutein Nanograms per litre Concentration of lutein per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) LUTNHPP1 Nanograms per litre n/a
Chl b Nanograms per litre Concentration of chlorophyll-b {chl-b} per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) CHLBHPP1 Nanograms per litre n/a
Divinyl chl a Nanograms per litre Concentration of divinyl chlorophyll-a per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) DVCAHPP1 Nanograms per litre n/a
Chl a Nanograms per litre Concentration of chlorophyll-a {chl-a} per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) CPHLHPP1 Milligrams per cubic metre Unit conversion x0.001 applied

Data Quality Report

The data originator has carried out a QC analysis of the data by comparing the extracted chl-a fluorometry profiles with the pigment profiles generated from the HPLC analysis. BODC were not advised by the data originator of any suspect data points.

Problem Report

This section is not relevant to this data set.


Project Information

The Atlantic Meridional Transect - Phase 2 (2002-2006)

Who was involved in the project?

The Atlantic Meridional Transect Phase 2 was designed by and implemented by a number of UK research centres and universities. The programme was hosted by Plymouth Marine Laboratory in collaboration with the National Oceanography Centre, Southampton. The universities involved were:

  • University of Liverpool
  • University of Newcastle
  • University of Plymouth
  • University of Southampton
  • University of East Anglia

What was the project about?

AMT began in 1995, with scientific aims to assess mesoscale to basin scale phytoplankton processes, the functional interpretation of bio-optical signatures and the seasonal, regional and latitudinal variations in mesozooplankton dynamics. In 2002, when the programme restarted, the scientific aims were broadened to address a suite of cross-disciplinary questions concerning ocean plankton ecology and biogeochemistry and the links to atmospheric processes.

The objectives included the determination of:

  • how the structure, functional properties and trophic status of the major planktonic ecosystems vary in space and time
  • how physical processes control the rates of nutrient supply to the planktonic ecosystem
  • how atmosphere-ocean exchange and photo-degradation influence the formation and fate of organic matter

The data were collected with the aim of being distributed for use in the development of models to describe the interactions between the global climate system and ocean biogeochemistry.

When was the project active?

The second phase of funding allowed the project to continue for the period 2002 to 2006 and consisted of six research cruises. The first phase of the AMT programme ran from 1995 to 2000.

Brief summary of the project fieldwork/data

The fieldwork on the first three cruises was carried out along transects from the UK to the Falkland Islands in September and from the Falkland Islands to the UK in April. The last three cruises followed a cruise track between the UK and South Africa, only deviating from the traditional transect in the southern hemisphere. During this phase the research cruises sampled further into the centre of the North and South Atlantic Ocean and also along the north-west coast of Africa where upwelled nutrient rich water is known to provide a significant source of climatically important gases.

Who funded the project?

Natural Environment Research Council (NERC)


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2004-10-18
End Date (yyyy-mm-dd) 2004-10-18
Organization Undertaking ActivityPlymouth Marine Laboratory
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierAMT15_CTD_CTD083t
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for AMT15_CTD_CTD083t

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
514243 10.0 1 1 1008.70 1009.30 1000.10 Lever Action Niskin Bottle No problem reported    
514244 10.0 2 2   503.90   504.20   500.20 Lever Action Niskin Bottle No problem reported    
514245 10.0 3 3   301.90   302.50   300.10 Lever Action Niskin Bottle No problem reported    
514246 10.0 4 4   202.00   202.20   200.70 Lever Action Niskin Bottle No problem reported    
514247 10.0 5 5   201.60   202.10   200.50 Lever Action Niskin Bottle No problem reported    
514248 10.0 6 6   151.80   152.00   150.90 Lever Action Niskin Bottle No problem reported    
514249 10.0 7 7   151.60   151.90   150.70 Lever Action Niskin Bottle No problem reported    
514250 10.0 8 8   101.30   101.60   100.80 Lever Action Niskin Bottle No problem reported    
514251 10.0 9 9     90.80     91.00     90.30 Lever Action Niskin Bottle No problem reported    
514252 10.0 10 10     79.80     80.30     79.50 Lever Action Niskin Bottle No problem reported    
514253 10.0 11 11     80.60     81.00     80.30 Lever Action Niskin Bottle No problem reported    
514254 10.0 12 12     80.40     80.60     80.00 Lever Action Niskin Bottle No problem reported    
514255 10.0 13 13     70.70     70.90     70.30 Lever Action Niskin Bottle No problem reported    
514256 10.0 14 14     60.20     60.40     59.90 Lever Action Niskin Bottle No problem reported    
514257 10.0 15 15     61.00     61.20     60.70 Lever Action Niskin Bottle No problem reported    
514258 10.0 16 16     50.10     51.10     50.30 Lever Action Niskin Bottle No problem reported    
514259 10.0 17 17     40.50     40.80     40.40 Lever Action Niskin Bottle No problem reported    
514260 10.0 18 18     40.20     40.80     40.20 Lever Action Niskin Bottle No problem reported    
514261 10.0 19 19     20.30     20.60     20.30 Lever Action Niskin Bottle No problem reported    
514262 10.0 20 20     20.70     20.80     20.60 Lever Action Niskin Bottle No problem reported    
514263 10.0 21 21     10.40     10.70     10.50 Lever Action Niskin Bottle No problem reported    
514264 10.0 22 22     10.40     10.70     10.50 Lever Action Niskin Bottle No problem reported    
514265 10.0 23 23       1.90       2.30       2.10 Lever Action Niskin Bottle No problem reported    
514266 10.0 24 24       1.60       1.90       1.70 Lever Action 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 D284 (AMT15)
Departure Date 2004-09-17
Arrival Date 2004-10-29
Principal Scientist(s)Andrew Rees (Plymouth Marine Laboratory)
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: AMT15_CTD_CTD083t

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
1126173Water sample data2004-10-18 11:43:0024.13152 S, 16.28376 WRRS Discovery D284 (AMT15)
1888676Water sample data2004-10-18 11:43:0024.13152 S, 16.28376 WRRS Discovery D284 (AMT15)