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Metadata Report for BODC Series Reference Number 1879464

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_079
BODC Series Reference 1879464

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2015-06-15 09:30
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -

Spatial Co-ordinates

Latitude 56.73321 N ( 56° 44.0' N )
Longitude 7.00093 W ( 7° 0.1' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 4.3 m
Maximum Sensor or Sampling Depth 132.9 m
Minimum Sensor or Sampling Height 0.6 m
Maximum Sensor or Sampling Height 129.2 m
Sea Floor Depth 133.5 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) 2015-06-15
End Date (yyyy-mm-dd) 2015-06-15
Organization Undertaking ActivityNational Oceanography Centre, Southampton
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierDY031_CTD_DY031_079
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 7G
CategoryOffshore location
Latitude56° 43.98' N
Longitude7° 0.00' W
Water depth below MSL145.0 m

Ellett Line/Extended Ellett Line: Station 7G

Station 7G 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 7G 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. During this period Station 7G was also referred to as Station C5.

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 7G

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
90594CTD or STD cast1976-04-04 15:05:0056.7333 N, 7.0083 WRRS Challenger CH5A/76
91087CTD or STD cast1977-03-08 05:10:0056.7466 N, 6.9833 WRRS Challenger CH4/77
91898CTD or STD cast1977-04-14 16:02:0056.7333 N, 7.0016 WRRS Challenger CH6B/77
94349CTD or STD cast1977-07-25 13:03:0056.7316 N, 6.995 WRRS Challenger CH11/77
92195CTD or STD cast1978-02-02 15:47:0056.7316 N, 7.0 WRRS Challenger CH2/78
94964CTD or STD cast1978-04-20 18:05:0056.745 N, 7.0 WRRS Challenger CH6/78
95734CTD or STD cast1978-06-09 17:11:0056.7383 N, 7.0066 WRRS Challenger CH9/78
186209CTD or STD cast1978-08-11 08:16:0056.7316 N, 7.005 WRRS Challenger CH11B/78
314312CTD or STD cast1978-11-04 21:12:0056.7367 N, 6.9967 WRRS Challenger CH14B/78
98824CTD or STD cast1979-05-22 04:25:0056.7316 N, 7.0 WRRS Challenger CH7/79
95814CTD or STD cast1979-09-13 12:45:0056.735 N, 7.005 WRRS Challenger CH13/79
96006CTD or STD cast1979-10-29 07:38:0056.7333 N, 6.9983 WRRS Challenger CH16/79
187803CTD or STD cast1980-03-04 20:18:0056.735 N, 7.0 WRRS Challenger CH4/80
189649CTD or STD cast1980-06-01 03:59:0056.7216 N, 7.03 WRRS Challenger CH9B/80
186885CTD or STD cast1980-10-02 13:24:0056.73 N, 7.0 WRRS Challenger CH15/80
312538CTD or STD cast1981-01-27 20:22:0056.7333 N, 7.0 WRRS Challenger CH2/81
187993CTD or STD cast1981-04-14 02:19:0056.7333 N, 7.0 WRRS Challenger CH6A/81
191457CTD or STD cast1981-07-07 10:46:0056.74 N, 7.015 WRRS Challenger CH10/81
187298CTD or STD cast1981-10-19 17:50:0056.7316 N, 7.0116 WRRS Challenger CH15/81
312772CTD or STD cast1982-01-27 20:24:0056.733 N, 7.0 WRRS Challenger CH2/82
189084CTD or STD cast1982-04-26 14:40:0056.7316 N, 6.9833 WRRS Challenger CH7A/82
193347CTD or STD cast1983-05-24 02:32:0056.7333 N, 7.0 WRRS Challenger CH7B/83
96786CTD or STD cast1983-08-15 17:04:0056.7316 N, 7.0083 WRRS Challenger CH11/83
313124CTD or STD cast1984-06-26 23:42:0056.7333 N, 6.9883 WRRS Challenger CH2/84
257986CTD or STD cast1984-12-02 23:06:0056.7366 N, 6.985 WRRS Challenger CH10/84
258584CTD or STD cast1985-01-28 21:19:0056.7333 N, 7.0 WRRS Challenger CH1/85
253807CTD or STD cast1985-05-08 02:54:0056.7333 N, 7.0 WRRS Challenger CH4/85
261101CTD or STD cast1985-08-19 13:17:0056.7333 N, 6.9983 WRRS Challenger CH8/85
255826CTD or STD cast1985-12-16 02:43:0056.7333 N, 7.0 WRRS Frederick Russell FR13/85
346117CTD or STD cast1986-06-14 07:44:0056.7333 N, 7.0 WMV Dawn Sky DSK1/86
346707CTD or STD cast1986-08-28 04:07:0056.7283 N, 7.0133 WRRS Frederick Russell FR7B/86
347981CTD or STD cast1986-09-26 10:52:0056.7333 N, 7.0 WRRS Frederick Russell FR8/86
264080CTD or STD cast1987-01-09 02:26:0056.7333 N, 7.0 WRRS Challenger CH9
250650CTD or STD cast1987-04-30 22:58:0056.7366 N, 7.0 WRRS Challenger CH14
255980CTD or STD cast1987-08-31 20:46:0056.7333 N, 7.0 WRRS Frederick Russell FR18/87
251340CTD or STD cast1987-11-24 21:41:0056.735 N, 7.0 WRRS Challenger CH22
267004CTD or STD cast1988-03-07 01:26:0056.7366 N, 7.005 WRRS Challenger CH25
262699CTD or STD cast1988-06-08 18:46:0056.735 N, 7.0 WRRS Challenger CH30
265267CTD or STD cast1989-01-23 22:47:0056.7333 N, 7.0 WRRS Discovery D180
265777CTD or STD cast1989-05-05 17:45:0056.7333 N, 7.0 WRV Lough Foyle LF1/89
317555CTD or STD cast1989-08-04 21:24:0056.735 N, 7.0017 WRV Lough Foyle LF2/89
316693CTD or STD cast1989-11-25 10:35:0056.7333 N, 7.005 WRRS Charles Darwin CD44
314754CTD or STD cast1990-03-13 02:02:0056.7367 N, 6.9933 WRRS Challenger CH63_2
315143CTD or STD cast1990-06-28 18:09:0056.7333 N, 7.0033 WRRS Challenger CH67A
259920CTD or STD cast1990-09-03 04:05:0056.7333 N, 7.0 WRRS Challenger CH71A
315905CTD or STD cast1990-12-10 01:54:0056.7333 N, 6.995 WRRS Challenger CH74A_1
382419CTD or STD cast1991-02-24 19:20:0056.7333 N, 7.0 WRRS Challenger CH75B
316110CTD or STD cast1991-07-02 01:42:0056.7333 N, 7.0017 WRRS Challenger CH81
384266CTD or STD cast1991-11-26 20:13:0056.74 N, 7.0033 WRRS Challenger CH86B
385024CTD or STD cast1992-03-08 02:30:0056.7333 N, 7.0 WRRS Challenger CH89B
386408CTD or STD cast1992-09-26 03:53:0056.73 N, 6.9967 WRRS Challenger CH97
385301CTD or STD cast1993-03-14 12:55:0056.7333 N, 6.9983 WRRS Challenger CH101B
386027CTD or STD cast1993-05-20 16:06:0056.735 N, 6.995 WRRS Challenger CH103
387971CTD or STD cast1993-09-10 01:47:0056.7347 N, 6.9967 WRRS Challenger CH105
388998CTD or STD cast1994-03-14 23:52:0056.7333 N, 7.0 WRRS Challenger CH110
389584CTD or STD cast1994-05-08 19:11:0056.7333 N, 7.0 WRRS Challenger CH112
391889CTD or STD cast1994-11-21 23:30:0056.7333 N, 7.0 WRRS Challenger CH116
434615CTD or STD cast1995-04-14 19:43:0056.7333 N, 7.0 WRRS Charles Darwin CD92B
435631CTD or STD cast1995-05-01 15:37:0056.7333 N, 7.0 WRRS Charles Darwin CD92B
390327CTD or STD cast1995-07-29 19:32:0056.7417 N, 6.9988 WRRS Challenger CH120
433937CTD or STD cast1996-01-11 20:58:0056.7333 N, 7.0 WRRS Challenger CH124
1289231Water sample data1996-01-11 20:58:0056.7333 N, 7.0 WRRS Challenger CH124
1075012CTD or STD cast2000-02-01 17:21:0056.73483 N, 7.0035 WRRS Discovery D245
845193CTD or STD cast2003-07-25 10:11:0056.73467 N, 6.99867 WFS Poseidon PO300_2
666982CTD or STD cast2004-07-12 15:59:0056.734 N, 6.998 WFS Poseidon PO314
896992CTD or STD cast2005-10-26 02:05:0056.73306 N, 6.99934 WRRS Charles Darwin CD176
776897CTD or STD cast2006-10-29 22:32:4756.7355 N, 6.99667 WRRS Discovery D312
847612CTD or STD cast2007-08-31 08:19:0556.73546 N, 7.00042 WRRS Discovery D321B
881053CTD or STD cast2008-05-23 20:51:0056.73317 N, 6.99933 WFRV Scotia 0508S
1617071Water sample data2008-05-23 20:51:0056.73317 N, 6.99933 WFRV Scotia 0508S
954763CTD or STD cast2009-06-24 22:47:1856.73261 N, 7.00235 WRRS Discovery D340A
1052941CTD or STD cast2010-05-21 12:53:0056.73033 N, 7.0005 WRRS Discovery D351
1896989Water sample data2010-05-21 13:04:0056.72999 N, 7.00057 WRRS Discovery D351
1195327CTD or STD cast2011-05-20 08:48:5256.7345 N, 6.99583 WRRS Discovery D365
1203279CTD or STD cast2012-08-02 16:16:0056.73294 N, 6.99988 WRRS Discovery D379
1220640CTD or STD cast2013-05-23 23:12:0156.7333 N, 7.0 WRRS James Cook JC086
1371376CTD or STD cast2014-07-17 05:17:0256.7328 N, 7.0006 WRRS James Clark Ross JR20140531 (JR302)
1723563CTD or STD cast2015-06-15 09:19:2856.7332 N, 7.001 WRRS Discovery DY031
1722640Currents -subsurface Eulerian2015-06-15 09:20:5656.73322 N, 7.00094 WRRS Discovery DY031
1764821CTD or STD cast2016-06-19 23:16:4356.733 N, 6.9986 WRRS Discovery DY052
1765953Currents -subsurface Eulerian2016-06-19 23:17:1556.73301 N, 6.99862 WRRS Discovery DY052
1875125Water sample data2016-06-19 23:26:0056.73301 N, 6.99861 WRRS Discovery DY052
1975833CTD or STD cast2017-05-14 16:36:1856.7345 N, 6.9998 WRRS Discovery DY078 (DY079)