Metadata Report for BODC Series Reference Number 1048512

• Metadata Summary

• Problem Reports

• Data Access Policy

• Narrative Documents

• Project Information

• Data Activity or Cruise Information

• Fixed Station Information

• BODC Quality Flags

• SeaDataNet Quality Flags

Metadata Summary

Problem Reports

No Problem Report Found in the Database

SIMORC Total Congo NKossa Met Narrative

Narrative

The instrument used was a met station at the Congo Nkossa. The parameters recorded were

• Wind direction
• 5 second gust speed
• Pitch and roll (excluded from processing)

Data Quality Information

The following data quality checks were applied

• Wind roses were checked for evidence of shadowing.
• Rates of change were checked and sudden spikes were flagged.

No gust speeds of less than 2 metres per second were recorded. This could be due to a zeroing error on the anemometer.

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

BODC Processing

Data were received by BODC in CSV format. They were then reformatted to QXF format using BODC transfer function 422. The following table shows how the variables within the files were mapped to the appropriate BODC parameter codes:

Pitch and roll were also recorded, but not included in the reformatting following advice from the data originator. 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:

• Irregularities such as unfeasible values
• Inconsistencies between related information, for example:
  • Times for instrument deployment and for start/end of data series
  • Length of record and the number of data cycles/cycle interval
  • Parameters expected and the parameters actually present in the data cycles
• Originator's comments on meter/mooring performance and data quality

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:

• Spurious data at the start or end of the record.
• Obvious spikes occurring in periods free from meteorological disturbance.
• A sequence of constant values in consecutive data cycles.

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:

• Maximum and minimum values of parameters (spikes excluded).
• The occurrence of meteorological events.

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

Data Activity

SIMORC Meteorological Station Congo NKossa

The position of the met station was 5.2869° S; 11.5642° E at an assumed height of 30 metres above mean sea level.

The weather station (unknown manufacturer) was deployed on behalf of TOTAL at Congo Nkossa from August 1st 2001 to September 30th 2002, but usable data (wind direction and 5 second gust speed) was only recorded from June to September 2002.

Related Data Activity activities are detailed in Appendix 1

Fixed Station Information

Fixed Station Information

Congo NKossa Fixed Station Document

This site is part of the Total offshore facility.

The moorings deployed lie within a box bounded by co-ordinates 5.28695 ° S, 11.5583° E at the southwest corner and 5.2333° S, 11.6167° E at the northeast corner. The water depth is 170 m.

Various deployments were taken from or near this station over a number of years.

Between July 1991 to July 1992

4 moorings, each consisting of 3 current meters, were deployed during this study.

Current data have been collected by I.D. Scope on behalf of Total from the NKossa Station, offshore Congo, as follows:

Where CM = Current Meter

Between September 1993 and May 1995

4 moorings, each consisting of 1 waverider, were deployed during this study.

Wave data have been collected by Meteomer on behalf of Total from the NKossa Station, offshore Congo, as follows:

Where WRB = Waverider Buoy

Between January 1997 and December 1998

The position of the instrument was 5.2333' S; 11.6167' E with a water depth of 180 m.

Wind data have been collected on behalf of Total by an anemometer installed on a Floating Production Storage and Offloading (FPSO) from the NKossa Station, offshore Congo, with the following series:

Related Fixed Station activities are detailed in Appendix 2

BODC Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

SeaDataNet Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

Appendix 1: met20012002

Related series for this Data Activity 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.

Appendix 2: Congo Nkossa

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.