Metadata Report for BODC Series Reference Number 963441


Metadata Summary

Data Description

Data Category CTD or STD cast
Instrument Type
NameCategories
Sea-Bird SBE 19 SEACAT CTD  CTD; water temperature sensor; salinity sensor
Instrument Mounting research vessel
Originating Country France
Originator Dr Valerie Quiniou-Ramus
Originating Organization Total S.A.
Processing Status QC in progress
Online delivery of data Download not available
Project(s) SIMORC
 

Data Identifiers

Originator's Identifier LOUROJUL09
BODC Series Reference 963441
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2009-07-25 10:40
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 7.50400 S ( 7° 30.2' S )
Longitude 11.23420 E ( 11° 14.1' E )
Positional Uncertainty 0.01 to 0.05 n.miles
Minimum Sensor or Sampling Depth 0.0 m
Maximum Sensor or Sampling Depth 1817.0 m
Minimum Sensor or Sampling Height 4.0 m
Maximum Sensor or Sampling Height 1821.0 m
Sea Floor Depth 1821.0 m
Sea Floor Depth Source -
Sensor or Sampling Distribution Variable common depth - All sensors are grouped effectively at the same depth, but this depth varies significantly during the series
Sensor or Sampling Depth Datum Sea floor reference - Depth measured as a height above sea floor but converted into a depth relative to the sea surface according to the same datum as used for sea floor depth (applicable to instrument depths not bathymetric depths)
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
 

Parameters

BODC CODERankUnitsTitle
ACYCAA011DimensionlessSequence number
PRESPR011DecibarsPressure (spatial co-ordinate) exerted by the water body by profiling pressure sensor and corrected to read zero at sea level
PSALST011DimensionlessPractical salinity of the water body by CTD and computation using UNESCO 1983 algorithm
TEMPST011Degrees CelsiusTemperature of the water body by CTD or STD

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

SIMORC data access conditions

The data collated and held at BODC on behalf of the SIMORC project are restricted. However, the data will be available to download from the Official SIMORC Website, as part of the project protocol. The data set will initially include data from the oil companies TOTAL, Shell and BP.


Narrative Documents

Sea-Bird SBE 19 and SBE 19plus SEACAT Profiler CTDs

The SBE 19 SEACAT Profiler is a self-contained, battery powered, pumped CTD system designed to measure conductivity, temperature, and pressure in marine or fresh water environments to depths of 10,500 meters. It was replaced by the SBE 19plus model in 2001. An updated version of this instrument is the SBE 19plus V2, which incorporates an electronics upgrade and additional features, with six differentially amplified A/D input channels, one RS-232 data input channel, and 64 MB FLASH memory.

The standard CTD unit comes with a plastic housing (rated to 600 m), although this can be replaced by titanium housing for depths up to 7000 m. It is typically used for CTD profiling although a conversion kit is available for mooring deployments. The CTD can also be attached to an SBE 36 CTD Deck Unit and Power/Data Interface Module (PDIM) for real-time operation on single-core armored cable up to 10,000 m.

Specifications

Parameter SBE 19 SBE 19plus
Temperature

Range: -5 to +35 °C

Accuracy: 0.01 °C

Resolution: 0.001 °C

Calibration: +1 to +32 °C*

Range: -5 to +35 °C

Accuracy: 0.005 °C

Resolution: 0.0001 °C

Calibration: +1 to +32 °C*

Conductivity

Range: 0 to 7 S m-1 (0 to 70 mmho cm-1)

Accuracy: 0.001 S m-1

Resolution: 0.0001 S m-1

Calibration: 0 to 7 S m-1. Physical calibration over the range 1.4 - 6 S m-1*

Range: 0 to 9 Sm-1

Accuracy: 0.0005

Resolution: 0.00005 (most oceanic waters, resolves 0.4 ppm in salinity); 0.00007 (high salinity waters, resolves 0.4 ppm in salinity); 0.00001 (fresh waters, resolves 0.1 ppm in salinity)

Calibration: 0 to 9 S m-1. Physical calibration over the range 1.4 - 6 S m-1*

Strain gauge pressure sensor

Range: 0 to100, 150, 300, 500, 1000, 1500, 3000, 5000, 10000 or 15000 psia

Accuracy: 0.25% of full scale range (100 - 1500 psia); 0.15% of full scale range (3000 - 15000 psia)

Resolution: 0.015% of full scale

Calibration: 0 to full scale in 20% steps

Range: 0 to 20, 100, 350, 1000, 2000, 3500 or 7000 m

Accuracy: 0.1% of full scale range

Resolution: 0.002% of full scale range

Calibration: ambient pressure to full scale range in 5 steps

*Measurements outside this range may be at slightly reduced accuracy due to extrapolation errors.

Options and accessories

Additional sensors can be attached to the CTD, including:

The standard SBE 5M pump may be replaced by an SBE 5P (plastic housing) or 5T (titanium housing) pump for use with dissolved oxygen and/or other pumped sensors. Further details can be found in the manufacturer's SBE 19plus V2 instrument specification or theSBE 19 andSBE 19 plus user guides.

BODC Processing

Data were received by BODC in ASCII format files (Fugro format). They were reformatted to QXF format using BODC transfer function 400. The following table shows how the variables within the files were mapped to the appropriate BODC parameter codes:

Original parameter name Original Units Description BODC Parameter Code BODC Units Comments
Time DD-MON-YY hh:mm:ss Date and time (GMT) AADYAA01 + AAFDZZ01 Day number and day fraction (GMT)  
TEMP degrees Celsius Sea temperature TEMPST01 degrees Celsius  
SAL PSU Salinity PSALST01 PSU  
Depth metres Depth PRESPR01 metres  

Following transfer to QXF, the data were screened using BODC's in-house visualisation software, EDSERPLO.

General Data Screening carried out by BODC

BODC screen both the series header qualifying information and the parameter values in the data cycles themselves.

Header information is inspected for:

Documents are written by BODC highlighting irregularities which cannot be resolved.

Data cycles are inspected using time or depth series plots of all parameters. Currents are additionally inspected using vector scatter plots and time series plots of North and East velocity components. These presentations undergo intrinsic and extrinsic screening to detect infeasible values within the data cycles themselves and inconsistencies as seen when comparing characteristics of adjacent data sets displaced with respect to depth, position or time. Values suspected of being of non-oceanographic origin may be tagged with the BODC flag denoting suspect value; the data values will not be altered.

The following types of irregularity, each relying on visual detection in the plot, are amongst those which may be flagged as suspect:

If a large percentage of the data is affected by irregularities then a Problem Report will be written rather than flagging the individual suspect values. Problem Reports are also used to highlight irregularities seen in the graphical data presentations.

Inconsistencies between the characteristics of the data set and those of its neighbours are sought and, where necessary, documented. This covers inconsistencies such as the following:

This intrinsic and extrinsic screening of the parameter values seeks to confirm the qualifying information and the source laboratory's comments on the series. In screening and collating information, every care is taken to ensure that errors of BODC making are not introduced.


Project Information

System of Industry Metocean data for the Offshore and Research Communities (SIMORC)

The EU-funded SIMORC project is a collaborative effort between MARIS (Netherlands), BODC (UK), the International Association of Oil and Gas Producers (OGP) and IOC-IODE to provide a harmonised and quality controlled metocean data set from data collected by oil and gas producers, accessible through the SIMORC protocol.


Data Activity or Cruise Information

Cruise

Cruise Name Seabulk Luanda 2009
Departure Date 2009-01-14
Arrival Date 2009-01-19
Principal Scientist(s)
Ship Seabulk Luanda

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameLouro, Angola Block 32
CategoryOffshore location
Latitude7° 30.24' S
Longitude11° 14.05' E
Water depth below MSL1832.0 m

Total - Angola Block 32 - Louro

Latitude Longitude Water depth (m)
7.504°S 11.23417°E 1829

This fixed station is in Block 32, offshore Angola. A mooring was deployed at this site in January 2009 to cover a 12-month period of measurements of currents through the water column. Prior to the mooring deployment, a CTD dip was undertaken to check the actual water depth.

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: Louro, Angola Block 32

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
963428CTD or STD cast2009-01-17 11:00:007.504 S, 11.2342 ESeabulk Luanda Seabulk Luanda 2009
1052455Offshore sea floor pressure series2009-01-17 11:50:007.504 S, 11.23417 EPetrogas Supply 1 Petrogas1
962449Currents -subsurface Eulerian2009-01-17 12:00:007.504 S, 11.2342 ESeabulk Luanda Seabulk Luanda 2009
962450Currents -subsurface Eulerian2009-01-17 12:00:007.504 S, 11.2342 ESeabulk Luanda Seabulk Luanda 2009
962610Currents -subsurface Eulerian2009-01-17 12:00:007.504 S, 11.2342 ESeabulk Luanda Seabulk Luanda 2009
962622Currents -subsurface Eulerian2009-01-17 12:00:007.504 S, 11.2342 ESeabulk Luanda Seabulk Luanda 2009
962634Currents -subsurface Eulerian2009-01-17 12:00:007.504 S, 11.2342 ESeabulk Luanda Seabulk Luanda 2009
962646Currents -subsurface Eulerian2009-01-17 12:00:007.504 S, 11.2342 ESeabulk Luanda Seabulk Luanda 2009
962658Currents -subsurface Eulerian2009-01-17 12:00:007.504 S, 11.2342 ESeabulk Luanda Seabulk Luanda 2009
962671Currents -subsurface Eulerian2009-01-17 12:00:007.504 S, 11.2342 ESeabulk Luanda Seabulk Luanda 2009
963397Hydrography time series at depth2009-01-17 12:00:007.504 S, 11.2342 ESeabulk Luanda Seabulk Luanda 2009
963385Hydrography time series at depth2009-01-17 12:10:007.504 S, 11.2342 ESeabulk Luanda Seabulk Luanda 2009
1095191CTD or STD cast2009-07-31 20:32:007.43115 S, 11.37261 ENot applicable
1095178CTD or STD cast2009-08-01 07:18:007.48931 S, 11.21687 ENot applicable
1095166CTD or STD cast2009-08-01 09:30:007.51441 S, 11.22179 ENot applicable
1095209CTD or STD cast2009-08-01 12:47:007.50099 S, 11.26061 ENot applicable