Metadata Report for BODC Series Reference Number 941285


Metadata Summary

Data Description

Data Category Bathythermograph -expendable
Instrument Type
NameCategories
Lockheed Martin Sippican T-5 XBT probe  bathythermographs; water temperature sensor
Instrument Mounting vessel of opportunity
Originating Country France
Originator Dr Valerie Quiniou-Ramus
Originating Organization Total S.A.
Processing Status banked
Project(s) SIMORC
 

Data Identifiers

Originator's Identifier 040703A
BODC Series Reference 941285
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2004-07-03 23:14
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 3.53367 N ( 3° 32.0' N )
Longitude 7.34938 E ( 7° 21.0' E )
Positional Uncertainty 0.01 to 0.05 n.miles
Minimum Sensor Depth 0.7 m
Maximum Sensor Depth 839.1 m
Minimum Sensor Height 0.9 m
Maximum Sensor Height 839.3 m
Sea Floor Depth 840.0 m
Sensor Distribution Variable common depth - All sensors are grouped effectively at the same depth, but this depth varies significantly during the series
Sensor Depth Datum Mean sea level - Depth expressed relative to mean sea level as defined by the data originator
Sea Floor Depth Datum Unspecified -
 

Parameters

BODC CODE Rank Units Short Title Title
ACYCAA01 1 Dimensionless Record_No Sequence number
DEPHPR01 1 Metres CmpDep Depth below surface of the water body by profiling pressure sensor and converted to seawater depth using UNESCO algorithm
SVELCT01 1 Metres per second CTD_Sound_Vel Sound velocity in the water body by CTD and computation from temperature and salinity by unspecified algorithm
TEMPST01 1 Degrees Celsius WC_temp_CTD Temperature 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

Instrument description

Lockheed Martin Sippican T-5 XBT Probe

The Expendable Bathythermograph system uses a sea water ground. As soon as an electrode within the nose of the expendable probe makes contact with the water, the circuit is complete and temperature or sound velocity data can be telemetered to the ship-board data processing equipment. The T-5 XBT Probe can be used within a maximum depth of 1830 m, with a rated ship speed of 6 knots and has a vertical resolution of 65 cm.

Manufacturer specifications can be found here

BODC CTD Screening

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 that cannot be resolved.

Data cycles are inspected using depth series plots of all parameters. These presentations undergo screening to detect infeasible values within the data cycles themselves and inconsistencies when comparing 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 following types of irregularity, each relying on visual detection in the time series plot, are amongst those that may be flagged as suspect:

If a large percentage of the data is affected by irregularities, deemed abnormal, then instead of flagging the individual suspect values, a caution may be documented.

The following types of inconsistency are detected automatically by software:

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

This 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's making are not introduced.

BODC Processing

The originator provided ASCII format files. These series were reformatted to the internal QXF format using BODC transfer function 422. The following table shows how the variables within the file were mapped to the appropriate BODC parameter codes:

Original parameter name Original Units Description BODC Parameter Code BODC Units Comments
Time * DD/MM/YYYY HH:MI date and time AADYAA01 + AAFDZZ01 day number and day fraction GMT Conversion by transfer
Depth(m) m   DEPHPR01 m  
Temperature(DegC) degrees Celsius   TEMPST01 degrees Celsius  
Salinity(psu) psu Practical salinity PSALST01 psu  
SoundVelocity(m_s) m.s -1   SVELCT01 m.s -1  
Conductivity(S_m) S.m -1   CNDCST01 S.m -1  

* The originator did not specify whether time is GMT or not.

The originator provided a density parameter which was not transferred as it can be calculated from the other parameters.

Following transfer to QXF, the data were screened using BODC's in-house visualisation software, EDSERPLO. Any data considered as suspect were flagged 'M'.


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 2004 12/13
Departure Date 2004-07-03
Arrival Date 2004-07-03
Principal Scientist(s)Unknown (Unknown)
Ship Rig Supporter

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameNigeria OPL 222 Usan
CategoryOffshore location
Latitude3° 30.18' N
Longitude7° 29.69' E
Water depth below MSL746.0 m

Nigeria OPL 222 Usan Fixed Station Document

On behalf of Elf Petroleum Nigeria Ltd, Fugro Global Environmental and Oceanographic Sciences has undertaken a one-year program of deep water oceanographic measurements in Block OPL222.

A single mooring was deployed, comprising oceanographic instrumentation measuring current speed and direction data throughout the water column, wave height and period, water level elevation and seawater temperature data.

A CTD profiler was deployed and recovered prior to both the mooring deployment and recovery to measure temperature and salinity profiles throughout the water column and verify the water depth.

The moorings deployed lie within a box bounded by co-ordinates 3.300715° N, 7.00628° E at the southwest corner and 3.60702° N, 7.52° E at the northeast corner.

Meteocean data have been collected on behalf of Total from the OPL 222 Usan Station as follows:

Rig / Instrument Identification Meter Type Start Date End Date Comments
OPL222#1 ADCP 30/05/2004 04/09/2004 Current and wave data were recorded.
OPL222#1 CM 30/05/2004 04/09/2004  
OPL222#1 WLR 30/05/2004 27/08/2004  
OPL222#2 ADCP 05/09/2004 20/01/2005 Current and wave data were recorded.
OPL222#2 CM 05/09/2004 20/01/2005  
OPL222#2 WLR 05/09/2004 04/12/2004  
OPL222#3 ADCP 22/01/2005 03/06/2005 Current and wave data were recorded.
OPL222#3 CM 22/01/2005 03/06/2005 RCM flooded and provided no data.
OPL222#3 WLR 22/01/2005 22/04/2005  

21 CTD casts were taken from 21/06/2004 to 04/07/2004.

Where

Other Cruises linked to this Fixed Station (with the number of series) - 2004 (1) 2004 (1) 2004 1/13 (3) 2004 10/13 (1) 2004 11/13 (2) 2004 13/13 (2) 2004 2/13 (2) 2004 3/13 (2) 2004 4/13 (1) 2004 5/13 (2) 2004 6/13 (1) 2004 7/13 (2) 2004 8/13 (1) 2004 9/13 (1) 2005 (1) 2005 (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