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Metadata Report for BODC Series Reference Number 1890472


Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
NameCategories
Niskin bottle  discrete water samplers
Instrument Mounting lowered unmanned submersible
Originating Country Spain
Originator Dr Emilio Fernandez Suarez
Originating Organization University of Vigo Department of Ecology and Animal Biology
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) Atlantic Meridional Transect (AMT)
 

Data Identifiers

Originator's Identifier AMT11_CTD_PIGX_173:AMT11-10
BODC Series Reference 1890472
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2000-09-19 04:52
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 31.57196 N ( 31° 34.3' N )
Longitude 21.18962 W ( 21° 11.4' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 5.1 m
Maximum Sensor or Sampling Depth 130.2 m
Minimum Sensor or Sampling Height 3822.4 m
Maximum Sensor or Sampling Height 3947.5 m
Sea Floor Depth 3952.6 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
BOTTFLAG1Not applicableSampling process quality flag (BODC C22)
CPHLFLP41Milligrams 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 and summation of size-fractionated values
SAMPRFNM1DimensionlessSample reference number
SCHLFLPF1Milligrams per cubic metreConcentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate 0.2-2um phase] by filtration, acetone extraction and fluorometry
SCHLFLPG1Milligrams per cubic metreConcentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate 2-20um phase] by filtration, acetone extraction and fluorometry
SCHLFLPQ1Milligrams per cubic metreConcentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >20um phase] by filtration, acetone extraction and fluorometry

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.

AMT1-6 and 11 size-fractionated extracted chlorophyll-a measured fluorometrically from CTD bottle samples

Data Acquisition and Analysis

These data originate from analyses on samples collected from CTD rosette bottles and the measurements were made concurrently with the depths sampled for the primary production (14C) incubations carried out during each cruise.

Water samples from the 5-7 main light depths were collected from CTD bottles. For AMT1 all samples were filtered through 0.2 µm filters only. For AMTs 2-6 and 11 size-fractionated chlorophyll-a concentrations were determined fluorometrically after sequential filtration of a 200 - 300 ml seawater sample through 20 µm, 2 µm and 0.2 µm polycarbonate filters. All filters were placed in 90% acetone at -20°C for pigment extraction.

Instrumentation Description

Turner Designs 10-AU fluorometer

BODC Data Processing Procedures

Data were submitted to BODC in an Excel spreadsheet with the Primary Production incubation data and were saved to the BODC archive with reference UVI020056. Sample metadata provided (CTD cast, latitude and depth) were checked against information held in the database. There were no discrepancies.

Where chl-a values were provided with no size fractioned data, the data were loaded under a separate parameter for total chl-a collected on a 0.2 µm filter, not a summation of different filter sizes.

Parameter codes defined in BODC parameter dictionary were assigned to the variable. The units supplied in the spreadsheet were mg m-3, which match the Parameter Dictionary units so no unit conversions were necessary.

Data loaded into BODC's database without any changes applied.

A parameter mapping table is provided below;

Originator's Parameter Units Description BODC Parameter Code Units Comments
Chl 0.2-2 µm mg m-3 Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate 0.2-2µm phase] by filtration, acetone extraction and fluorometry SCHLFLPF mg m-3 n/a
Chl 2-20 µm mg m-3 Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate 0.2-2µm phase] by filtration, acetone extraction and fluorometry SCHLFLPG mg m-3 n/a
Chl >20 µm mg m-3 Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate >20µm phase] by filtration, acetone extraction and fluorometry SCHLFLPQ mg m-3 n/a
Chlorophyll-a mg m-3 Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate >0.2µm phase] by filtration, acetone extraction, fluorometry and summation of size-fractionated values CPHLFLP4 mg m-3 n/a
Chl >2 µm mg m-3 Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate >2µm phase] by filtration, acetone extraction and fluorometry SCHLFLPB mg m-3 n/a
Chl >0.2 µm mg m-3 Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate >0.2µm phase] by filtration, acetone extraction and fluorometry CPHLFLP5 mg m-3 n/a

Data Quality Report

BODC were not advised of any data quality checks made by the data originator prior to submission of the dataset.

Problem Report

Not relevant to this dataset.


Project Information

The Atlantic Meridional Transect (AMT) - Phase 1 (1995-2000)

Who was involved in the project?

The Atlantic Meridional Transect (AMT) programme was designed by and implemented as a collaboration between Plymouth Marine Laboratory (PML) and Southampton Oceanography Centre (SOC). The programme was hosted by Plymouth Marine Laboratory and involved additional researchers from UK and international universities throughout its duration.

What was the project about?

When AMT began in 1995 the programme provided a platform for international scientific collaboration, including the calibration and validation of SeaWiFs measurements and products. The programme provided an exceptional opportunity for nationally and internationally driven collaborative research and provided a platform for excellent multi-disciplinary oceanographic research. As an in situ observation system, the data collected by the AMT consortium informed on changes in biodiversity and function of the Atlantic ecosystem during this period of rapid change to our climate and biosphere.

The scientific aims were to assess:

  • mesoscale to basin scale phytoplankton processes
  • the functional interpretation of bio-optical signatures
  • the seasonal, regional and latitudinal variations in mesozooplankton dynamics

When was the project active?

The first phase of the AMT programme ran from 1995 to 2000 and consisted of a total of 12 cruises. A second phase of funding allowed the project to continue for the period 2002 to 2006 with a further 6 cruises.

Brief summary of the project fieldwork/data

The AMT programme undertook biological, chemical and physical oceanographic research during the annual return passage of the RRS James Clark Ross between the UK and the Falkland Islands or the RRS Discovery between the UK and Cape Town, a distance of up to 13,500 km. This transect crossed a range of ecosystems from sub-polar to tropical and from euphotic shelf seas and upwelling systems to oligotrophic mid-ocean gyres. The transect route was covered north-south in September/October and south-north in April/May of each year.

The measurements of hydrographic and bio-optical properties, plankton community structure and primary production completed on the first 12 transects (1995-2000) represent the most coherent set of repeated biogeochemical observations over ocean basin scales. This unique dataset has led to several important discoveries concerning the identification of oceanic provinces, validation of ocean colour algorithms, distributions of picoplankton, identifying new regional sinks of pCO2 and variability in rates of primary production and respiration.

Who funded the project?

The programme was funded by the Natural Environment Research Council (NERC) and further support was received from the National Aeronautics and Space Administration (NASA) with equipment and funding from the Sea-viewing Wild Field-of-view Sensor (SeaWiFS) project.


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2000-09-19
End Date (yyyy-mm-dd) 2000-09-19
Organization Undertaking ActivityPlymouth Marine Laboratory
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierAMT11_CTD_AMT11-10
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for AMT11_CTD_AMT11-10

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
505948        180.80  181.60  180.40 Niskin bottle No problem reported    
505949        130.20  131.00  130.20 Niskin bottle No problem reported    
505950        120.30  121.30  120.40 Niskin bottle No problem reported    
505951        115.10  116.10  115.30 Niskin bottle No problem reported    
505952        104.80  105.70  105.00 Niskin bottle No problem reported    
505953         80.70   81.40   81.00 Niskin bottle No problem reported    
505954         40.30   41.20   41.00 Niskin bottle No problem reported    
505955         20.20   21.20   21.10 Niskin bottle No problem reported    
506000        251.20  252.20  250.30 Niskin bottle No problem reported    
506084        160.40  161.30  160.20 Niskin bottle No problem reported    
506085          4.00    5.20    5.10 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 JR20000912 (AMT11, JR52 Leg1, JR53)
Departure Date 2000-09-12
Arrival Date 2000-10-11
Principal Scientist(s)E Malcolm S Woodward (Plymouth Marine Laboratory)
Ship RRS James Clark Ross

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: AMT11_CTD_AMT11-10

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
1095467Water sample data2000-09-19 04:52:0031.57196 N, 21.18962 WRRS James Clark Ross JR20000912 (AMT11, JR52 Leg1, JR53)
1632817Water sample data2000-09-19 04:52:0031.57196 N, 21.18962 WRRS James Clark Ross JR20000912 (AMT11, JR52 Leg1, JR53)
1787094Water sample data2000-09-19 04:52:0031.57196 N, 21.18962 WRRS James Clark Ross JR20000912 (AMT11, JR52 Leg1, JR53)
1853191Water sample data2000-09-19 04:52:0031.57196 N, 21.18962 WRRS James Clark Ross JR20000912 (AMT11, JR52 Leg1, JR53)