Metadata Report for BODC Series Reference Number 1731028

• 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

The directional energy density data submitted to BODC purported to be in mm²/Hz/cycle but the range of values was impossibly high. Therefore, these values were divided by an arbitrary value of 10⁸ to bring them to an acceptable range of values for units of m²/Hz/cycle. It cannot be guaranteed therefore, that these values are actually in units of m²/Hz/cycle.

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

RD instrument Workhorse ADCP self contained and wave processing

The Workhorse ADPC self contained 1200, 600, 300 khz ADCP are a current profiler and is easily upgraded to include pressure, bottom tracking, and/or directional wave measurement.

The basic principle behind wave the measurement, is that the wave orbital velocities below the surface can be measured by the highly accurate ADCP. The ADCP is bottom mounted, upward facing and has a pressure sensor for measuring tide and mean water depth. Time series of velocities are accumulated and from these time series, velocity power spectra are calculated. To get a surface height spectrum the velocity spectrum is translated to surface displacement using linear wave kinematics. The depth of each bin measured and the total water depth are used to calculate this translation. To calculate directional spectra phase information must be preserved. Each bin in each beam is considered to be an independent sensor in an array. The cross-spectrum is then calculated between each sensor and every other sensor in the array. The result is a cross-spectral matrix that contains phase information in the path between each sensor and every other sensor at each frequency band. The cross-spectrum at a particular frequency is linearly related to the directional spectrum at a particular frequency. By inverting this forward relation we solve for the directional spectrum.

The wave processing from ADCP data is described in:

Originator's Data Processing

Data processing

Data were processed and quality controlled by Fugro as follows:

• The record was truncated to exclude times pre and post deployment.
• Time was shifted to GMT.
• Data was adjusted from magnetic to true north using a magnetic variation of 5.6°E.
• Error flagging of records beyond extreme limits and and exceeding QC parameter thresholds.
• Finally, the data were inspected by an experienced oceanographer to identify and remove any anomalous values.

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 Moored Instrument AHRCD#4

The nominal position of this deployment is 40.87467° N, 49.53333° E with a water depth of 25 m.

The instrument was installed on a sea bed frame on 18/09/2006 and was removed on 10/12/2006. This installation was set on behalf of TOTAL in Azerbaijan, Caspian Sea and consisted of the following series.

ASB =Above Sea Bed.

Related Data Activity activities are detailed in Appendix 1

Cruise

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

SIMORC: TOTAL Azerbaijan Sharabad Offshore Fixed Station Document

Temperature, salinity sensors and tide gauge were deployed on a sea bed frame 5 times between 18/12/2005 and 21/03/2007 at this site.

The nominal position is 40.87527°N; 49.51677° E with a water depth of 25 m.

Data were collected by Fugro Geos on behalf of TOTAL from Sharabad fixed station as follows:

Where: HRCD = Moored hydrographical data, ADCP = Acoustic Doppler Current Meter.

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: AHRCD#4

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: Azerbaijan Sharabad offshore

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.