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Metadata Report for BODC Series Reference Number 1893039


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 Dr Ruth Airs
Originating Organization Plymouth Marine Laboratory
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) Oceans 2025 Theme 10 SO1:AMT
 

Data Identifiers

Originator's Identifier JR20081003_CTD_PIGX_670:CTD021
BODC Series Reference 1893039
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2008-10-13 05:43
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 30.47237 N ( 30° 28.3' N )
Longitude 33.95127 W ( 33° 57.1' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 3.5 m
Maximum Sensor or Sampling Depth 123.4 m
Minimum Sensor or Sampling Height 4688.1 m
Maximum Sensor or Sampling Height 4808.0 m
Sea Floor Depth 4811.5 m
Sea Floor Depth Source PEVENT
Sensor or Sampling Distribution Unspecified -
Sensor or Sampling Depth Datum Unspecified -
Sea Floor Depth Datum Unspecified -
 

Parameters

BODC CODERankUnitsTitle
ABCRHPP11Nanograms per litreConcentration of beta,epsilon-carotene+beta,beta-carotene {alpha-carotene+beta-carotene} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)
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 {But-fuco(BF) CAS 111234-30-1} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)
C1C2HPP11Nanograms per litreConcentration of chlorophyll-c1+c2 per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)
CBDVHPP11Nanograms per litreConcentration of chlorophyll-b+divinyl chlorophyll-b {chl-b+DVchl-b} 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)
DIATHPP11Nanograms per litreConcentration of diatoxanthin {CAS 31063-73-7} 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)
GDHPLC011Nanograms per litreConcentration of gyroxanthin diester 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)
ROSPOSID1DimensionlessBottle rosette position identifier
SAMPRFNM1DimensionlessSample reference number
VINEHPP11Nanograms per litreConcentration of violaxanthin+neoxanthin 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

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.

If the Information Provider does not provide a specific attribution statement, or if you are using Information from several Information Providers and multiple attributions are not practical in your product or application, you may consider using the following:

"Contains public sector information licensed under the Open Government Licence v1.0."


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 and Lever Action bottles have a capacity between 1.7 and 30 L. Reversing thermometers may be attached to a spring-loaded disk that rotates through 180° on bottle closure.

AMT18 (JR20081003) pigment composition by HPLC analysis from CTD bottle samples

Data Acquisition and Analysis

Samples (1-3L) were vacuum filtered onto GF/F filters, flash frozen in liquid nitrogen and stored at -80°C on board ship. At PML, samples were stored in liquid nitrogen until analysis. Pigments were extracted from the sample filters into 2 mL 100% acetone using an ultrasonic probe (35 s; 50W). An internal standard was used (Trans-B-Apo-8'-carotenal) to correct for water content of filters. Extracts were centrifuged to remove filter and cell debris (5 min at 4000 rpm) and analysed by reversed phase HPLC, using a method based on Barlow et al. 1997. Analyses were performed using a Thermo Accela Series HPLC system with chilled autosampler (4°C) and photodiode array detector. The HPLC was calibrated using a suite of standards purchased from DHI (Denmark). Pigments were identified based on retention time and spectral match using photo-diode array.

Instrumentation Description

Thermo Accela Series HPLC system

BODC Data Processing Procedures

These data supersede data previously supplied to BODC without quality assurance (see the Data Quality Report section for more details). Data were submitted to BODC in Microsoft Excel spreadsheet format and saved to the archive with reference PML130050. The file was provided to BODC with date, latitude, longitude, station number and depth as metadata. Sample metadata were checked against information held in the database - there were no discrepancies.

The following parameters were provided in the file but only the parameters that were not derived from the summation of other parameters in the dataset were loaded into the database. The absent data value was recorded as the effective limit of detection (LOD). The effective limits of detection, calculated for a filter volume of 3L are given in the table below.

Originator's Parameter Originator's description Sum of Effective LOD (µg/L) Database load
[TChl a] Total chlorophyll a [Chlide a] + [DVChl a] + [Chl a] - No
[TChl b] Total chlorophyll b [DVChl b] + [Chl b] - No
[TChl c] Total chlorophyll c [Chl c12] + [Chl c3] - No
[Caro] Carotenes (beta-beta-Car + beta-epsilon-Car) - 0.001 Yes
[But fuco] 19'-Butanoyloxyfucoxanthin - 0.001 Yes
[Hex fuco] 19'-Hexanoyloxyfucoxanthin - 0.001 Yes
[Allo] Alloxanthin - 0.001 Yes
[Diad] Diadinoxanthin - 0.001 Yes
[Diato] Diatoxanthin - 0.001 Yes
[Fuco] Fucoxanthin - 0.001 Yes
[Perid] Peridinin - 0.002 Yes
[Zea] Zeaxanthin - 0.001 Yes
[Chl a] Chlorophyll a - 0.003 Yes
[DVChl a] Divinyl chlorophyll a - 0.002 Yes
[Chl b] + [DVChl b] Chlorophyll b + Divinyl chlorophyll b - 0.003 Yes
[Chl c12] chlorophyll c1 + chlorophyll c2 - 0.001 Yes
[Chl c3] chlorophyll c3 - 0.001 Yes
[Lut] lutein - 0.001 Yes
[Viola] + [Neo] Violaxanthin + Neoxanthin - 0.001 Yes
[Gyr diester] Gyroxanthin diester - 0.001 Yes
[TChl] Total Chlorophyll [TChl a] + [TChl b] + [TChl c] - No
[PPC] Photoprotective carotenoids [Allo]+[Diad]+[Diato]+[Zea]+[Caro] - No
[PSC] Photosynthetic carotenoids [But]+[Fuco]+[Hex fuco]+Perid] - No
[PSP] Photosynthetic pigments [PSC]+[TChl] - No
[TAcc] Total accessory pigments [PPC]+[PSC]+[TChl b]+[TChl c] - No
[TPig] Total pigments [TAcc]+[TChl a] - No

There were duplicate data provided for 3 samples (cast 78, depth 2 m; cast 82, depth 55 m; cast 100, depth 20 m) and the mean and standard deviation for these values were entered into the database for each sample.

Parameter codes defined in BODC parameter dictionary were assigned to the variables as shown in the table below. The data were provided in µg l-1 units that were converted to ng l-1 for all parameters but chlorophyll-a.

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

Originator's Parameter Units Description BODC Parameter Code
+ SD Code
Units Comments
[Chl a] µg l-1 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
SDCLHPP1
mg m-3 n/a
[Chl b + DVChl b] µg l-1 Concentration of chlorophyll-b+divinyl chlorophyll-b per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) CBDVHPP1
CBDVSDP1
ng l-1 Unit conversion x1000 applied
[DVChl a] µg l-1 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
DVCASDP1
ng l-1 Unit conversion x1000 applied
[Chl c12] µg l-1 Concentration of chlorophyll-c1c2 {chl-c1c2} per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) C1C2HPP1
C1C2SDP1
ng l-1 Unit conversion x1000 applied
[Chl c3] µg l-1 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
CLC3SDP1
ng l-1 Unit conversion x1000 applied
[Caro] µg l-1 Concentration of beta,epsilon-carotene+beta,beta-carotene {alpha-beta-carotene alpha+beta-carotene} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) ABCRHPP1
ABCRSDP1
ng l-1 Unit conversion x1000 applied
[Perid] µg l-1 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
PERISDP1
ng l-1 Unit conversion x1000 applied
[But fuco] µg l-1 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
BUTASDP1
ng l-1 Unit conversion x1000 applied
[Fuco] µg l-1 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
FUCXSDP1
ng l-1 Unit conversion x1000 applied
[Hex fuco] µg l-1 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
HEXOSDP1
ng l-1 Unit conversion x1000 applied
[Viola + Neo] µg l-1 Concentration of violaxanthin+neoxanthin per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) VINEHPP1
VINESDP1
ng l-1 Unit conversion x1000 applied
[Diad] µg l-1 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
DIADSDP1
ng l-1 Unit conversion x1000 applied
[Allo] µg l-1 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
ALLOSDP1
ng l-1 Unit conversion x1000 applied
[Diato] µg l-1 Concentration of diatoxanthin per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) DIATHPP1
DIATSDP1
ng l-1 Unit conversion x1000 applied
[Zea] µg l-1 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
ZEOXSDP1
ng l-1 Unit conversion x1000 applied
[Lut] µg l-1 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
LUTNSDP1
ng l-1 Unit conversion x1000 applied
[Gyr diester] µg l-1 Concentration of gyroxanthin diester per unit volume of the water column [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC) GDHPLC01
GDIESDP1
ng l-1 Unit conversion x1000 applied

Data Quality Report

Dataset originally obtained using inadequate quality assurance (QA) procedures (for an example of adequate QA procedures during pigment analysis, see Van Heukelem and Hooker (2011)). A series of duplicate samples spanning the chl-a concentration range observed in the dataset were analysed using a quality assured, validated HPLC method by an experienced pigment scientist. A comparison between the original and duplicate sample pigment concentrations was performed, and systematic errors for individual pigments identified. The AMT18 pigment dataset was corrected for the systematic errors identified. The same process was carried out for the AMT19 CTD bottle pigment dataset analysed at PML and theAMT19 surface pigment samples which were collected and later analysed independently by a validated pigment method in a NASA laboratory (Hornpoint). This enabled validation of the corrected PML dataset. The root mean square deviation of the two sample sets (PML and Hornpoint) was determined and normalized to the concentration range for each pigment. The average normalized root mean square deviation for the primary pigments was 7.9%. Notably, the highest NRMSD value for the primary pigments was observed for diatoxanthin, which was present at low concentration in all but one of the compared samples.

The precision for replicate filters (gives whole method precision, from filtering to analysis) was provided in a separate file and is available on request to BODC. The average coefficients of variation (CV%) were 7.02 and 14.74 for [TChl a] and [TPig], respectively.

Samples values provided with the effective LOD were flagged '<' for each parameter in the database.

Problem Report

This section is not relevant to this data set.

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.

Van Heukelem L. and Hooker S.B. 2011. The importance of a quality assurance plan for method validation and minimizing uncertainties in the HPLC analysis of phytoplankton pigments. In: Phytoplankton Pigments: Characterization, Chemotaxonomy and Applications in Oceanography, eds. Suzanne Roy, Carole A. Llewellyn, Einar Skarstad Egeland and Geir Johnsen. Cambridge University Press.


Project Information

Oceans 2025 Theme 10, Sustained Observation Activity 1: The Atlantic Meridional Transect (AMT)

The Atlantic Meridional Transect has been operational since 1995 and through the Oceans 2025 programme secures funding for a further five cruises during the period 2007-2012. The AMT programme began in 1995 utilising the passage of the RRS James Clark Ross between the UK and the Falkland Islands southwards in September and northwards in April each year. Prior to Oceans 2025 the AMT programme has completed 18 cruises following this transect in the Atlantic Ocean. This sustained observing system aims to provide basin-scale understanding of the distribution of planktonic communities, their nutrient turnover and biogenic export in the context of hydrographic and biogeochemical provinces of the North and South Atlantic Oceans.

The Atlantic Meridional Transect Programme is an open ocean in situ observing system that will:

  • give early warning of any fundamental change in Atlantic ecosystem functionng
  • improve forecasts of the future ocean state and associated socio-economic impacts
  • provide a "contextual" logistical and scientific infrastructure for independently-funded national and international open ocean biogeochemical and ecological research.

The specific objectives are:

  • To collect hydrographic, chemical, ecological and optical data on transects between the UK and the Falkland Islands
  • To quantify the nature and causes of ecological and biogeochemical variability in planktonic ecosystems
  • To assess the effects of variability in planktonic ecosystems on biogenic export and on air-sea exchange of radiatively active gases

The measurements taken and experiments carried out on the AMT cruises will be closely linked to Themes 2 and 5. The planned cruise track also allows for the AMT data to be used in providing spatial context to the Sustained Observation Activities at the Porcupine Abyssal Plain Ocean Observatory (SO2) and the Western Channel Observatory (SO10).

More detailed information on this Work Package is available at pages 6 - 9 of the official Oceans 2025 Theme 10 document: Oceans 2025 Theme 10

Weblink: http://www.oceans2025.org/


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2008-10-13
End Date (yyyy-mm-dd) 2008-10-13
Organization Undertaking ActivityPlymouth Marine Laboratory
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierJR20081003_CTD_CTD021
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for JR20081003_CTD_CTD021

Sample reference number 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
189267 1 1   305.80   306.80   304.00 20-litre Niskin No problem reported    
189268 2 2   204.90   205.90   203.90 20-litre Niskin No problem reported    
189269 3 3   174.40   175.40   173.60 20-litre Niskin No problem reported    
189270 4 4   174.40   175.40   173.60 20-litre Niskin No problem reported    
189271 5 5   133.90   134.90   133.40 20-litre Niskin No problem reported    
189272 6 6   123.80   124.80   123.40 20-litre Niskin No problem reported    
189273 7 7   116.80   117.80   116.50 20-litre Niskin No problem reported    
189274 8 8   116.80   117.80   116.50 20-litre Niskin No problem reported    
189275 9 9   113.50   114.50   113.20 20-litre Niskin No problem reported    
189276 10 10   103.60   104.60   103.40 20-litre Niskin No problem reported    
189277 11 11     89.50     90.50     89.40 20-litre Niskin No problem reported    
189278 12 12     89.40     90.40     89.30 20-litre Niskin No problem reported    
189279 13 13     68.50     69.50     68.50 20-litre Niskin No problem reported    
189280 14 14     68.40     69.40     68.40 20-litre Niskin No problem reported    
189281 17 15     51.20     52.20     51.30 20-litre Niskin No problem reported    
189282 18 16     51.20     52.20     51.30 20-litre Niskin No problem reported    
189283 15 17     43.20     44.20     43.40 20-litre Niskin No problem reported    
189284 16 18     43.20     44.20     43.40 20-litre Niskin No problem reported    
189285 19 19     30.20     31.20     30.50 20-litre Niskin No problem reported    
189286 20 20     30.20     31.20     30.50 20-litre Niskin No problem reported    
189287 24 21     30.20     31.20     30.50 20-litre Niskin No problem reported    
189288 21 22     17.10     18.10     17.50 20-litre Niskin No problem reported    
189289 22 23       3.00       4.00       3.50 20-litre Niskin No problem reported    
189290 23 24       3.00       4.00       3.50 20-litre Niskin 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 JR20081003 (AMT18, JR218)
Departure Date 2008-10-03
Arrival Date 2008-11-10
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
B nominal value
Q value below limit of quantification

Appendix 1: JR20081003_CTD_CTD021

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
1091270Water sample data2008-10-13 05:43:0030.47237 N, 33.95127 WRRS James Clark Ross JR20081003 (AMT18, JR218)