Metadata Report for BODC Series Reference Number 941027


Metadata Summary

Data Description

Data Category Currents -subsurface Eulerian
Instrument Type
NameCategories
Teledyne RDI Workhorse Long-Ranger ADCP  current profilers
Instrument Mounting subsurface mooring
Originating Country France
Originator Dr Valerie Quiniou-Ramus
Originating Organization TotalFinaElf (now Total S.A.)
Processing Status QC in progress
Project(s) SIMORC
 

Data Identifiers

Originator's Identifier DPL1_000MAT.MAT
BODC Series Reference 941027
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2003-03-18 12:00
End Time (yyyy-mm-dd hh:mm) 2003-11-12 10:40
Nominal Cycle Interval 1200.0 seconds
 

Spatial Co-ordinates

Latitude 5.65363 N ( 5° 39.2' N )
Longitude 113.92450 E ( 113° 55.5' E )
Positional Uncertainty 0.01 to 0.05 n.miles
Minimum Sensor Depth 24.7 m
Maximum Sensor Depth 632.7 m
Minimum Sensor Height 1369.3 m
Maximum Sensor Height 1977.3 m
Sea Floor Depth 2002.0 m
Sensor Distribution Sensor fixed, measurements made at fixed depths - The sensor is at a fixed depth, but measurements are made remotely from the sensor over a range of depths (e.g. ADCP measurements)
Sensor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
 

Parameters

BODC CODE Rank Units Short Title Title
HBINAA01 0 Metres BinHeight Height above bed (ADCP bin) in the water body
AADYAA01 1 Days Date(Loch_Day) Date (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ01 1 Days Time(Day_Fract) Time (time between 00:00 UT and timestamp)
ACYCAA01 1 Dimensionless Record_No Sequence number
HEADCM01 1 Degrees Platform_Heading Orientation (horizontal relative to true north) of measurement device {heading}
PPSAADCP 1 Metres ADCP_Instr_Dep Depth below surface of the water body by acoustic doppler current profiler (ADCP) and computation from travel time averaged from all operational beams and unknown sound velocity profile
PTCHFG01 1 Degrees Pitch_(Fluxgate) Orientation (pitch) of measurement platform by triaxial fluxgate compass
ROLLFG01 1 Degrees Roll_(Fluxgate) Orientation (roll angle) of measurement platform by triaxial fluxgate compass
TEMPPR01 1 Degrees Celsius Temp Temperature of the water body
LCEWAP01 2 Centimetres per second CurrVelE_ADCP Eastward current velocity (Eulerian) in the water body by moored acoustic doppler current profiler (ADCP)
LCNSAP01 2 Centimetres per second CurrVelN_ADCP Northward current velocity (Eulerian) in the water body by moored acoustic doppler current profiler (ADCP)
LRZAAP01 2 Centimetres per second ADCPVC Upward current velocity in the water body by moored acoustic doppler current profiler (ADCP)
 

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

SIMORC Total Brunei ADCP Data Narrative

Narrative

Two ADCPs, 6 current meters and a water level recorder were deployed on a single mooring. The mooring deployment had to be terminated early and only the 75 kHz upward looking ADCP deployed at 650 metres depth was able to be recovered.

Data Quality Information

The following data quality checks were applied

The ADCP data were found to be of mostly good quality although the shallowest bins were noisier. All parameters were flagged suspect for the first 57 datacycles, as the depth channel indicated that the instrument had not yet reached its mooring depth of 650 metres.


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

Teledyne RDI's Workhorse Long Ranger ADCP

The Workhorse Long-Ranger acoustic doppler current profiler (Teledyne RD Instruments) is a long-range and long-term self contained ADCP. It has a patented broadband signal (75 kHz) and a standard depth rating of 1500m. It operates effectively between temperatures of -5°C and 45°C and has a velocity accuracy of ±1% ±5mm/s.

The instrument comprises:

BODC Current Meter 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 which cannot be resolved.

Data cycles are inspected using time 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 following types of irregularity, each relying on visual detection in the time series plot, are amongst those which 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. Likewise documents will highlight irregularities seen in the current vector scatter plots such as incongruous centre holes, evidence of mooring 'knock-down', abnormal asymmetry in tidally dominated records or gaps as when a range of speeds or directions go unregistered due to meter malfunction.

The term 'knock-down' refers to the situation when the 'drag' exerted on a mooring at high current speeds may cause instruments to tilt beyond the angle at which they are intended to operate. At this point the efficiency of the current sensors to accurately record the flow is reduced.

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 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.

BODC Processing

Data were received by BODC in an RDI proprietary format. This was reformatted to Matlab, using the RDI software windadcp and then to QXF format using BODC transfer function 416. 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 Conversion by transfer
Bin Metres Depth bin DBINAA01 Metres  
SerEmmpersec mm/second Velocity East LCEWAP01 cm/second *0.1
SerNmmpersec mm/second Velocity North LCNSAP01 cm/second *0.1
SerVmmpersec mm/second Vertical Velocity LRZAAP01 cm/second *0.1
AnDepthmm mm Depth below surface PPSAADCP Metres  
AnT100thdeg 100*degrees Celsius Temperature TEMPPR01 degrees Celsius *0.01
AnH100thDeg 100*radial degrees Heading HEADCM01 degrees True *0.01
AnP100thDeg 100*radial degrees Pitch PTCHFG01 degrees *0.01
AnR100thDeg 100*radial degrees Roll ROLLFG01 degrees *0.01

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


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

Start Date (yyyy-mm-dd) 2003-03-18
End Date (yyyy-mm-dd) 2003-11-12
Organization Undertaking ActivityTotalFinaElf (now Total S.A.)
Country of OrganizationFrance
Originator's Data Activity Identifier650mUP
Platform Categorysubsurface mooring

SIMORC Mooring South China Sea Block J

This mooring was deployed from the survey vessel M/V Malcos on March 18th 2003 and was partially recovered on 12th November 2003. The mooring was deployed on the sea floor on behalf of TOTAL and consisted of the following instruments.

Instrument type Serial Number Deployment start Deployment end Comments
RD Instrument Long Ranger 75 kHz upward looking ADCP 1119 18/03/2003 12:00:00 12/11/2003 10:40:00 Deployed at 650 metres depth
RD Instrument Workhorse 300 kHz upward looking ADCP   18/03/2003 12:00:00 12/11/2003 10:40:00 including wave capability; NOT RECOVERED
Aanderaa RCM7 current meters   18/03/2003 12:00:00 12/11/2003 10:40:00 Deployed at 900, 1100, 1300, 1500,1700 and 7 metres above the sea bed; NOT RECOVERED
WLR-7   18/03/2003 12:00:00 12/11/2003 10:40:00 NOT RECOVERED

Cruise

Cruise Name 2003
Departure Date 2003-03-17
Arrival Date 2003-03-20
Principal Scientist(s)Unknown (Unknown)
Ship Malcos

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameSouth China Sea, Block J
CategoryOffshore location
Latitude5° 39.22' N
Longitude113° 55.47' E
Water depth below MSL2002.0 m

SIMORC: TOTAL South China Sea Block J Fixed Station Document

This site is offshore Malaysia/ Brunei. The nominal position of this site is 5.65363° N; 113.9425° E with a water depth of 2002 metres.


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