Metadata Report for BODC Series Reference Number 1621764

Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
unknown  unknown
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Mr Malcolm Woodward
Originating Organization Plymouth Marine Laboratory
Processing Status banked
Project(s) GEOTRACES

Data Identifiers

Originator's Identifier D357_UCCTD_NUTS_62:CTD040_T
BODC Series Reference 1621764

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2010-11-15 15:29
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -

Spatial Co-ordinates

Latitude 39.29276 S ( 39° 17.6' S )
Longitude 7.65178 E ( 7° 39.1' E )
Positional Uncertainty Unspecified
Minimum Sensor Depth 9.9 m
Maximum Sensor Depth 5259.8 m
Minimum Sensor Height 40.2 m
Maximum Sensor Height 5290.1 m
Sea Floor Depth 5300.0 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
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

RRS Discovery Cruise D357 (UK GEOTRACES) dissolved Nutrient CTD bottle data

Responsible investigator

Malcolm Woodward
Plymouth Marine Laboratory (PML)
Prospect Place
The Hoe
United Kingdom

Data contributor


Laboratory of analysis

Shipboard - Plymouth Marine Laboratory (PML)


To investigate the spatial and temporal variations of the micromolar nutrient species; Nitrate, Nitrite, Silicate, Ammonium and Phosphate during the research cruise across the 40 degree south transect.

Sampling and analysis was carried out according to Go-Ship protocols wherever possible, a certified International Nutrient reference materials provided by KANSO, Japan was used during this cruise, as part of the global programme to improve nutrient analysis data quality world-wide.

Originator's Data Processing

Sampling Strategy

Water samples were taken from either a 24 x 20 litre stainless steel CTD/Rosette system (SeaBird), or an automatically fired (Sea-Ram system, (SeaBird)) CTD 24 bottle system on a trace metal free titanium rosette system. These samples were processed within the trace metal free sampling laboratory container .The CTD bottles were sub sampled into acid clean, 'aged', 60 mls HDPE (nalgene) sample bottles and analysis for the nutrient samples was in most cases complete within 2-3 hours of sampling.

Clean handling techniques were employed to avoid any contamination of the samples, particularly for the ammonium samples. Gloves used were Dura-Touch, and all people sampling prior to the nutrients from the CTD wore these gloves. Samples were not decanted and kept tightly closed until just before analysis for the ammonium, this to avoid any contamination from external sources.

Sample preparation

No filtering or any storage. In the rare cases where there was an instrument delays or problems samples were stored in the dark at 5 degrees. Samples were always run at lab temperature.

Sample Analysis

All samples were analysed on a 5 channel (nitrate, nitrite, phosphate, silicate and ammonium) Bran and Luebbe AAIII segmented flow, colorimetric, autoanalyser.

The ammonium channel was dropped once the ship left the waters of the continental shelf as the sensitivity of the colorimetric system was insufficient for the water column concentrations found.

The instrument was calibrated with home produced nutrient standards and then compared against Certified Nutrient Reference Materials, from KANSO Technos, Japan. A deep water reference sample was taken from about 1000m at the first station and was used to act as a daily tracking standard.

The analytical chemical methodologies used were according to Brewer and Riley (1965) for nitrate, Grasshoff (1976) for nitrite, Kirkwood (1989) for phosphate and silicate, and Mantoura and Woodward (1983) for ammonium.

References Cited

Jia-Zhong Zhang and Jie Chi, 2002. Automated Analysis of Nanomolar Concentrations of Phosphate in Natural Waters with Liquid Waveguide. Environ. Sci. Technol., 36 (5), pp 1048-1053

Brewer P.G. and Riley J.P., 1965. The automatic determination of nitrate in seawater. Deep Sea Research, 12, 765-72.

Grasshoff K., 1976. Methods of seawater analysis. Verlag Chemie, Weinheim and New York, 317pp.

Kirkwood D., 1989. Simultaneous determination of selected nutrients in seawater. ICES CM 1989/C:29.

Mantoura R.F.C. and Woodward, E.M.S., 1983. Optimisation of indophenol blue method for the automated determination of ammonia in estuarine waters. Estuarine Coastal and Shelf Science, 17, 219-24.

BODC data processing

The data were supplied to BODC as an Excel spreadsheet. The variables supplied by the Data Originator were mapped to BODC parameter vocabularies as follows:

Originator's Parameter Units Description BODC Parameter Code Units Comments
Nitrate+nitrite µmol l -1 Concentration of nitrate+nitrite {NO 3 +NO 2 } per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis NTRZAATX µmol l -1 n/a
Nitrite µmol l -1 Concentration of nitrite {NO 2 } per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis NTRIAATX µmol l -1 n/a
Phosphate µmol l -1 Concentration of phosphate {PO 4 } per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis PHOSAATX µmol l -1 n/a
Silicate µmol l -1 Concentration of silicate {SiO 4 } per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis SLCAAATX µmol l -1 n/a
Ammonium µmol l -1 Concentration of ammonium {NH 4 } per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis AMONAATX µmol l -1 n/a

Data Quality

Numerous data had been flagged at being below the limit of detection by the originator. These data have been assigned the BODC flag '<'.

CTD009_S bottle 13,14,15,16,17, CTD019_S bottle 6, CTD042_S bottle 14 and CTD046_S bottle 5 have been marked as suspect by the data originator. All data from these bottles have been assigned BODC flag 'L'.

Problem report


Project Information



GEOTRACES is an international programme sponsored by SCOR which aims to improve our understanding of biogeochemical cycles and large-scale distribution of trace elements and their isotopes (TEIs) in the marine environment. The global field programme started in 2009 and will run for at least a decade. Before the official launch of GEOTRACES, fieldwork was carried out as part of the International Polar Year (IPY)(2007-2009) where 14 cruises were connected to GEOTRACES.

GEOTRACES is expected to become the largest programme to focus on the chemistry of the oceans and will improve our understanding of past, present and future distributions of TEIs and their relationships to important global processes.

This initiative was prompted by the increasing recognition that TEIs are playing a crucial role as regulators and recorders of important biogeochemical and physical processes that control the structure and productivity of marine ecosystems, the dispersion of contaminants in the marine environment, the level of greenhouse gases in the atmosphere, and global climate.

Scientific Objectives

GEOTRACES mission is: To identify processes and quantify fluxes that control the distribution of key trace elements and isotopes in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions.

Three overriding goals support the GEOTRACES mission

These goals will be pursued through complementary research strategies, including observations, experiments and modelling.


The central component of GEOTRACES fieldwork will be a series of cruises spanning all Ocean basins see map below.

BODC image

Three types of cruise are required to meet the goals set out by GEOTRACES. These are


The IPY-GEOTRACES programme comprised of 14 research cruises on ships from 7 nations; Australia, Canada, France, Germany, New Zealand, Japan and Russia. The cruises will not be classified in the same way as the full GEOTRACES programme since the intercalibration protocols and data management protocols had not been established before the start of the IPY. But IPY-GEOTRACES data will still be quality controlled by GDAC and in the majority of cases verified versus Intercalibration standards or protocols.

Key parameters

The key parameters as set out by the GEOTRACES science plan are as follows: Fe, Al, Zn, Mn, Cd, Cu; 15N, 13C; 230Th, 231Pa; Pb isotopes, Nd isotopes; stored sample, particles, aerosols.


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2010-11-15
End Date (yyyy-mm-dd) 2010-11-15
Organization Undertaking ActivityUniversity of Oxford Department of Earth Sciences
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierD357_UCCTD_CTD040_T
Platform Categorylowered unmanned submersible

BODC Sample Metadata Report for D357_UCCTD_CTD040_T

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
238546   1 1 5366.30 5367.10 5259.80 unknown No problem reported 764  
238547   2 2 5100.40 5104.30 5003.40 unknown No problem reported 765  
238548   3 3 5097.10 5101.10 5000.30 unknown No problem reported 766  
238549   4 4 4067.90 4071.50 3999.80 unknown No problem reported 767  
238550   5 5 3042.60 3046.20 2999.00 unknown No problem reported 768  
238551   6 6 2021.10 2026.70 1998.90 unknown No problem reported 769  
238552   7 7 1515.80 1520.90 1501.80 unknown No problem reported 770  
238553   8 8 1009.70 1010.50  999.70 unknown No problem reported 771  
238554   9 9  706.20  708.30  700.30 unknown No problem reported 772  
238555   10 10  404.60  405.50  401.40 unknown No problem reported 773  
238556   11 11  402.90  403.90  399.70 unknown No problem reported 774  
238557   12 12  202.60  203.70  201.40 unknown No problem reported 775  
238558   13 13  200.50  201.50  199.20 unknown No problem reported 776  
238559   14 14  198.00  199.60  197.00 unknown No problem reported 777  
238560   15 15  101.60  102.20  101.10 unknown No problem reported 778  
238561   16 16   99.20  100.30   98.90 unknown No problem reported 779  
238562   17 17   97.40   98.40   97.00 unknown No problem reported 780  
238563   18 18   50.90   52.50   51.20 unknown No problem reported 781  
238564   19 19   48.40   50.60   48.90 unknown No problem reported 782  
238565   20 20   47.10   48.90   47.30 unknown No problem reported 783  
238566   21 21   26.70   27.40   26.70 unknown No problem reported 784  
238567   22 22   24.10   26.10   24.60 unknown No problem reported 785  
238568   23 23   22.40   23.20   22.70 unknown No problem reported 786  
238569   24 24    9.80   10.50    9.90 unknown No problem reported 787  

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.


Cruise Name D357 (GA10)
Departure Date 2010-10-18
Arrival Date 2010-11-22
Principal Scientist(s)Gideon Henderson (University of Oxford Department of Earth Sciences)
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