Search the data

Metadata Report for BODC Series Reference Number 1879199

Metadata Summary

Data Description

Data Category Water sample data
Instrument Type
Niskin bottle  discrete water samplers
SIS Dissolved Oxygen Analyser  titrators
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Dr Penny Holliday
Originating Organization National Oceanography Centre, Southampton
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) NOCS National Capability

Data Identifiers

Originator's Identifier DY031_CTD_DOXY_213:DY031_051
BODC Series Reference 1879199

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-10 23:35
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -

Spatial Co-ordinates

Latitude 57.50860 N ( 57° 30.5' N )
Longitude 12.24916 W ( 12° 14.9' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 4.1 m
Maximum Sensor or Sampling Depth 1789.4 m
Minimum Sensor or Sampling Height 9.4 m
Maximum Sensor or Sampling Height 1794.7 m
Sea Floor Depth 1798.8 m
Sea Floor Depth Source SCILOG
Sensor or Sampling Distribution Unspecified -
Sensor or Sampling Depth Datum Unspecified -
Sea Floor Depth Datum Unspecified -


BODC CODERankUnitsTitle
ADEPZZ011MetresDepth (spatial coordinate) relative to water surface in the water body
BOTTFLAG1Not applicableSampling process quality flag (BODC C22)
DOKGWITX1Micromoles per kilogramConcentration of oxygen {O2 CAS 7782-44-7} per unit mass of the water body [dissolved plus reactive particulate phase] by Winkler titration
DOXYWITX1Micromoles per litreConcentration of oxygen {O2 CAS 7782-44-7} per unit volume of the water body [dissolved plus reactive particulate phase] by Winkler titration
FIRSEQID1DimensionlessBottle firing sequence number
OXYTMP011Degrees CelsiusTemperature of oxygen fixation
ROSPOSID1DimensionlessBottle rosette position identifier
SAMPRFNM1DimensionlessSample reference number

Definition of BOTTFLAG

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

SIS Instruments Dissolved Oxygen Analyser

The SIS Instruments Dissolved Oxygen Analyser (DOA) is a PC controlled instrument which is used for the determination of dissolved oxygen in aqueous solutions by the Winkler (1888) titration method. The system consists of a transportable box containing a Metrohm 765 Dosimat motor burette, alternating light photometer and an interface box which provides, via an RS 232 serial link, communication between computer and the instruments. The box also contains a stand with a stirrer used to hold the sample flask. The titration endpoint is determined by eye. Alongside the DOA, SIS instruments provide Windows database and processing software, which is required for data storage and post-processing of the acquired data.


Dimensions 43 x 54 x 41 cm
Weight 20 kg
Voltage 120 and 240 V AC
Frequency 50 to 60 Hz
Burette Metrohm 765 Dosimat
Photometer Alternating light photometer operating with two wavelengths, 15 Bit ADC
Accuracy Absolute 0.3 %
Repeated 0.1%

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.

Discrete Oxygen Samples from CTD bottles for RRS Discovery Cruise DY031

Originator's Protocol for Data Acquisition and Analysis

Water samples were drawn from the CTD rosette bottles deployed during the cruise with samples taken from 80 of the total of 85 CTD casts undertaken.

Dissolved oxygen (DO) concentrations were measured in discrete seawater samples collected during DY031. Sampling and analysis were performed 24 hours a day using Winkler photometric auto-titration following 'Go-Ships' protocols (Langdon, 2010) based on the standard methodologies of Carpenter,1965 adapted for large scale hydrographic studies (e.g. Culberson, 1991 and Dickson, 1995). For more information see the cruise report.


Carpenter, J.H. 1965. The Chesapeake Bay Institute technique for the Winkler dissolved oxygen method. Limnol.and Oceanogr. 10:141-143.

Culberson, C.H. 1991. Dissolved Oxgyen. WHPO Publication 91-1.

Dickson, A.D. 1995. Determination of dissolved oxygen in sea water by Winkler titration. WOCE Operations Manual, Part 3.1.3 Operations and Methods, WHP Office Report WHPO 91-1.

Langdon. C. 2010. Determination of dissolved oxygen in seawater by Winkler titration using the amperometric technique. The GO-SHIP Repeat hydrography manual: A collection of expert reports and guidelines. IOCCP report No.14.

BODC Data Processing Procedures

The sample data were supplied to BODC in MStar format. Data received were loaded into the BODC database using established BODC data banking procedure. Originator's parameters were mapped with BODC codes as follows;

Originator's Parameter Unit Description BODC Parameter code BODC Unit Comments
botoxy µmol/kg Concentration of oxygen {O2 CAS 7782-44-7} per unit mass of the water body [dissolved plus reactive particulate phase] by Winkler titration DOKGWITX µmol/kg n/a
botoxy_per_l µM Concentration of oxygen {O2 CAS 7782-44-7} per unit volume of the water body [dissolved plus reactive particulate phase] by Winkler titration DOXYWITX µM n/a
botoxytemp °C Temperature of oxygen fixation OXYTMP01 °C n/a

Project Information

NOCS National Capability

The National Oceanography Centre Southampton National Capability focuses on long term science concerned with basin/decadal variability of the Ocean.

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2015-06-10
End Date (yyyy-mm-dd) 2015-06-11
Organization Undertaking ActivityNational Oceanography Centre, Southampton
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierDY031_CTD_DY031_051
Platform Categorylowered unmanned submersible

No Document Information Held for the Series


Cruise Name DY031
Departure Date 2015-05-29
Arrival Date 2015-06-17
Principal Scientist(s)N Penny Holliday (National Oceanography Centre, Southampton)
Ship RRS Discovery

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

Station NameEllett Line/Extended Ellett Line Station F
CategoryOffshore location
Latitude57° 30.48' N
Longitude12° 15.00' W
Water depth below MSL1817.0 m

Ellett Line/Extended Ellett Line: Station F

Station F is one of the fixed CTD stations, which together form The Extended Ellett Line. The line lies between Iceland and the Sound of Mull (Scotland) crossing the Iceland Basin and Rockall Trough via the outcrop of Rockall. As part of this initiative, CTD dips, together with associated discrete sampling of the water column, have typically been carried out annually at this station since September 1996.

Prior to September 1996, Station F was part of a shorter repeated survey section, consisting of 35 fixed stations, known as The Ellett Line (originally termed the Anton Dohrn Seamount Section). This line incorporated those stations across the Rockall Trough and Scottish shelf between Rockall and the Sound of Mull and was visited at regular intervals (usually at least once a year) between 1975 and January 1996.

Related Fixed Station activities are detailed in Appendix 1

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: Ellett Line/Extended Ellett Line Station F

Related series for this Fixed Station 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
89998CTD or STD cast1975-05-05 00:17:0057.5 N, 12.25 WRRS Challenger CH7A/75
89359CTD or STD cast1975-07-06 12:27:0057.5 N, 12.25 WRRS Challenger CH10A/75
90232CTD or STD cast1975-11-09 12:01:0057.5066 N, 12.2466 WRRS Challenger CH14A/75
90465CTD or STD cast1976-04-02 04:53:0057.5183 N, 12.2483 WRRS Challenger CH5A/76
91284CTD or STD cast1976-05-23 00:57:0057.5116 N, 12.2466 WRRS Challenger CH8/76
90902CTD or STD cast1977-03-06 15:25:0057.5083 N, 12.245 WRRS Challenger CH4/77
94141CTD or STD cast1977-07-23 20:10:0057.51 N, 12.2333 WRRS Challenger CH11/77
88805CTD or STD cast1977-08-22 17:11:0057.5133 N, 12.2483 WRRS Challenger CH13/77
94442CTD or STD cast1978-04-16 05:58:0057.5083 N, 12.25 WRRS Challenger CH6/78
95224CTD or STD cast1978-06-05 09:00:0057.505 N, 12.2683 WRRS Challenger CH9/78
186013CTD or STD cast1978-08-09 16:42:0057.5116 N, 12.245 WRRS Challenger CH11B/78
190780CTD or STD cast1978-09-11 21:30:0057.5033 N, 12.2516 WRRS Challenger CH11D/78
187514CTD or STD cast1980-03-02 03:48:0057.5066 N, 12.2483 WRRS Challenger CH4/80
188867CTD or STD cast1980-05-03 19:47:0057.51 N, 12.2566 WRRS Challenger CH7/80
188308CTD or STD cast1981-04-20 03:11:0057.51 N, 12.25 WRRS Challenger CH6B/81
189336CTD or STD cast1982-05-01 21:15:0057.51 N, 12.2466 WRRS Challenger CH7A/82
189416CTD or STD cast1982-05-09 02:20:0057.5066 N, 12.2483 WRRS Challenger CH7B/82
193624CTD or STD cast1983-05-26 07:45:0057.5083 N, 12.25 WRRS Challenger CH7B/83
96934CTD or STD cast1983-08-17 19:30:0057.5066 N, 12.2483 WRRS Challenger CH11/83
96946CTD or STD cast1983-08-17 19:30:0057.5066 N, 12.2483 WRRS Challenger CH11/83
313369CTD or STD cast1984-06-28 23:48:0057.5117 N, 12.2333 WRRS Challenger CH2/84
257427CTD or STD cast1984-11-21 13:13:0057.5066 N, 12.2466 WRRS Challenger CH10/84
258295CTD or STD cast1985-01-25 21:54:0057.51 N, 12.2483 WRRS Challenger CH1/85
254024CTD or STD cast1985-05-09 15:23:0057.5083 N, 12.245 WRRS Challenger CH4/85
261334CTD or STD cast1985-08-21 14:25:0057.5083 N, 12.25 WRRS Challenger CH8/85
250441CTD or STD cast1987-04-28 15:37:0057.5066 N, 12.25 WRRS Challenger CH14
265488CTD or STD cast1989-01-25 17:35:0057.5 N, 12.25 WRRS Discovery D180
265986CTD or STD cast1989-05-07 03:04:0057.5166 N, 12.25 WRV Lough Foyle LF1/89
317764CTD or STD cast1989-08-06 05:17:0057.51 N, 12.25 WRV Lough Foyle LF2/89
316957CTD or STD cast1989-11-27 02:30:0057.5083 N, 12.2483 WRRS Charles Darwin CD44
314951CTD or STD cast1990-06-27 08:52:0057.5083 N, 12.2517 WRRS Challenger CH67A
259711CTD or STD cast1990-09-01 12:49:0057.5166 N, 12.25 WRRS Challenger CH71A
382641CTD or STD cast1991-02-28 00:26:0057.5067 N, 12.2517 WRRS Challenger CH75B
316343CTD or STD cast1991-07-03 17:22:0057.5067 N, 12.2533 WRRS Challenger CH81
386617CTD or STD cast1992-09-28 09:38:0057.5083 N, 12.2517 WRRS Challenger CH97
385602CTD or STD cast1993-05-15 04:50:0057.5067 N, 12.2467 WRRS Challenger CH103
387749CTD or STD cast1993-09-05 21:30:0057.5065 N, 12.253 WRRS Challenger CH105
389210CTD or STD cast1994-05-02 10:47:0057.5083 N, 12.25 WRRS Challenger CH112
390954CTD or STD cast1994-08-19 00:17:0057.5048 N, 12.2423 WRRS Challenger CH114
435274CTD or STD cast1995-04-28 00:21:0057.5083 N, 12.25 WRRS Charles Darwin CD92B
390585CTD or STD cast1995-08-01 06:00:0057.5083 N, 12.25 WRRS Challenger CH120
434178CTD or STD cast1996-01-14 07:11:0057.5083 N, 12.25 WRRS Challenger CH124
1014700CTD or STD cast1996-10-02 11:56:0057.51867 N, 12.24833 WRRS Discovery D223A
1850200Water sample data1996-10-02 12:53:0057.51872 N, 12.24839 WRRS Discovery D223A
1008000CTD or STD cast1997-09-13 12:03:0057.50433 N, 12.26683 WRRS Discovery D230
1304978Water sample data1997-09-13 12:48:0057.5044 N, 12.26681 WRRS Discovery D230
1020613CTD or STD cast1998-05-25 19:21:0057.52017 N, 12.24517 WRRS Discovery D233
1306254Water sample data1998-05-25 20:16:0057.52023 N, 12.24524 WRRS Discovery D233
1849420Water sample data1998-05-25 20:16:0057.52023 N, 12.24524 WRRS Discovery D233
1076943CTD or STD cast1999-05-30 20:19:0057.51267 N, 12.243 WNot applicable
1070787CTD or STD cast1999-09-13 12:51:0057.508 N, 12.258 WRRS Discovery D242
1252119Water sample data1999-09-13 13:18:0057.508 N, 12.258 WRRS Discovery D242
559081CTD or STD cast2000-05-18 02:08:0057.5383 N, 12.2567 WFRV Scotia 0700S
676915CTD or STD cast2001-05-21 16:11:0057.51133 N, 12.24417 WRRS Discovery D253
626826CTD or STD cast2003-04-18 21:55:0057.5098 N, 12.243 WFRV Scotia 0703S
844915CTD or STD cast2003-07-21 20:38:0057.50908 N, 12.24168 WFS Poseidon PO300_2
667186CTD or STD cast2004-07-14 16:45:0057.517 N, 12.248 WFS Poseidon PO314
896525CTD or STD cast2005-10-12 01:17:0057.50902 N, 12.25014 WRRS Charles Darwin CD176
776547CTD or STD cast2006-10-24 08:56:1957.5125 N, 12.25267 WRRS Discovery D312
847415CTD or STD cast2007-08-29 02:26:0357.51132 N, 12.25122 WRRS Discovery D321B
880793CTD or STD cast2008-05-21 20:49:0057.50067 N, 12.25683 WFRV Scotia 0508S
1616817Water sample data2008-05-21 20:49:0057.50067 N, 12.25683 WFRV Scotia 0508S
954241CTD or STD cast2009-06-17 08:50:3757.50962 N, 12.24236 WRRS Discovery D340A
1052707CTD or STD cast2010-05-19 10:22:3657.51867 N, 12.23917 WRRS Discovery D351
1929917Currents -subsurface Eulerian2010-05-19 10:23:4457.5171 N, 12.2487 WRRS Discovery D351
1896732Water sample data2010-05-19 11:26:0057.52135 N, 12.23791 WRRS Discovery D351
1195721CTD or STD cast2011-05-30 07:29:2157.51067 N, 12.2395 WRRS Discovery D365
1203581CTD or STD cast2012-08-05 04:01:0057.50869 N, 12.24728 WRRS Discovery D379
1220363CTD or STD cast2013-05-19 00:25:3857.5082 N, 12.25 WRRS James Cook JC086
1371118CTD or STD cast2014-07-15 00:26:4557.508 N, 12.2495 WRRS James Clark Ross JR20140531 (JR302)
1722338Currents -subsurface Eulerian2015-06-10 19:15:1057.5086 N, 12.24918 WRRS Discovery DY031
1723250CTD or STD cast2015-06-10 22:45:2857.5086 N, 12.2492 WRRS Discovery DY031
1764532CTD or STD cast2016-06-16 03:41:3857.508 N, 12.2531 WRRS Discovery DY052
1765664Currents -subsurface Eulerian2016-06-16 03:41:5457.50803 N, 12.25306 WRRS Discovery DY052
1874865Water sample data2016-06-16 04:26:0057.50802 N, 12.25305 WRRS Discovery DY052