Metadata Report for BODC Series Reference Number 896212

• 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

Data quality report of GMET

There are several short gaps:

• on the 01/09/2001 09:30 to 14:00
• on the 07/09/2001 from 11:30 to 12:40
• on the 09/09/2001 from 10:00 to 11:00
• from 09/09/2001 17:00 to 10/09/2001 07:00
• on the 10/09/2001 from 09:30 to 10:30
• on the 30/11/2001 from 09:00 to 18:00
• on the 11/12/2001 from 12:30 to 13:30
• on the 09/05/2002 from 11:00 to 15:00
• on 24/06/2002 10:00 to 14:00

On 18/04/2002 there was a sudden decrease in value of every parameter. This seemed suspicious and was flagged accordingly. The problem resolved itself shortly afterwards.

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

QMH101/HMP45A/HMP45D Relative Humidity and Temperature Probes

The Vaisala Relative Humidity and Temperature Probe QMH101/QMH102 is based on Vaisala's HMP45D probes.

Relative humidity measurement

• Measurement range : from 0.8 to 100 % RH
• Accuracy at +20 °C (+68 °F) field calibration against references: ±2 % RH (when RH between 0 and 90 % RH) ; ±3 % RH (when RH between 90 and 100 % RH)

Temperature measurement

• Measurement range: from -40 to +60 °C (from -40 to +140 °F)

Mechanics

• Cable length: 3.5 m
• Weight: 350 g (including package)

For more specification, please report to the manufacturer specification here

BODC Processing

Data were received by BODC in ASCII format files. The originator provided monthly files which were concatenated into a Matlab format files for transfer in order to get 1 series per deployment. The average of the data values having the same date and time was calculated and taken (data values being very close and no information about these datacycles was provided), in order to get one unique data value for each date and time.

This series was reformatted to the internal QXF format using BODC transfer function 415. The following table shows how the variables within the file were mapped to the appropriate BODC parameter codes:

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

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

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 Mooring Angola Girassol GMET#1

A meteorological station was installed on a FPSO (Floating Production, Storage and Offloading vessel) between 01/09/2001 and 05/06/2003.

The nominal position of this series is 7.7° S; 11.66667° E with a water depth of 1360 m.

The meteorological station was deployed on behalf of TOTAL at the Angola Girassol site and consisted of the following instruments.

Fixed Station Information

Fixed Station Information

SIMORC: Total Angola, Block 17 Girassol, Fixed Station Document

This site is part of the Total facility.

The moorings deployed lie within a box bounded by co-ordinates 7.7° S, 11.65° E at the southwest corner and 7.67° S, 11.6825° E at the northeast corner.

The GIRASSOL platform, Block 17, offshore Angola consists of a Floating Production, Storage and Offloading vessel (FPSO) and a Single Buoy Mooring (SBM).

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

Between September 1997 and October 1998

A current meter mooring occupied this site. In addition to time series data obtained from the moored instruments, CTD profiles were conducted following the deployment and prior to the recovery of the mooring to be used for calibration purposes.

Between March 2001 and July 2004

Wind, current and wave data have been collected on behalf of Total on the Girassol field.

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:

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: ANGOLA GIRASSOL

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.