Metadata Report for BODC Series Reference Number 768873
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
Data Description |
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Data Identifiers |
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Time Co-ordinates(UT) |
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Parameters |
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Problem Reports
No Problem Report Found in the Database
Data quality report M9801140D1
In LCNSEL01 (current northward component), datacycles 1350, 3831 were flagged because they are spikes. In LCSAEL01 (current speed), datacycles 1573, 3730, 3956, 5765 were flagged because they are spikes. In LCDAEL01 (current direction), several datacycles were flagged because they are spikes.
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
InterOcean Spherical Solid State Sensor Current Meter S4 series
The S4 family are self-contained current measuring sensors enclosing all necessary solid state electronics for acquiring, processing and outputting data. Data retrieval is accomplished through a serial port without opening the instrument.
The spherical shape of the S4 is a contributing factor in the rejection of the vertical components of water movement and there are no protruding parts or sensor support structures to interfere with the water flow.
The S4 measures the magnitude and direction of the horizontal current motion of the water. Water flows through the electromagnetic field created by the instrument, thereby producing a voltage which is proportional to the magnitude of the water velocity past the sensor. This voltage is then sensed by two pairs of titanium electrodes located symmetrically on the equator of the spherical housing which forms the sensor.
Manufacturer's specifications: Meter (sphere, diameter 25cm) is designed for depths down to 1000m (S4 standard: glass-filled cycloaliphalic epoxy construction with grooved surface for hydrodynamic stability) or down to 6000m (S4D, deep: annealed borosilicate glass version with smooth surface). The meter is shackled directly into the mooring cable by means of an axial titanium load bearing shaft.
Meter comprises:-
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Electromagnetic, 2 axis current speed sensor, range 0 to 350cm/s (standard) 0 to 50 and 0 to 100cm/s (optional), resolution 0.2cm/s (standard) 0.03cm/s (0 to 50 range) 0.06cm/s (0 to 100 range), accuracy 2 per cent reading +/- 1cm/s. The sensor responds to the component of flow normal to its vertical axis.
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Flux-gate magnetometer compass for heading information used to reference the current direction to magnetic north, compass range 360°, resolution 0.5°, accuracy 2°, tilt +/- 25° for specified accuracy.
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Temperature stable quartz oscillator clock, accuracy 12 minutes/year.
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Optional automatic tilt compensation i.e. the allowable tilt of the meter from the vertical at which the vertical cosine response is fully corrected, angle range +/- 45°, resolution 0.6°, accuracy (speed correction) 1 per cent (angle output) 0.25°.
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Optional semiconductor (thermistor or platinum) temperature sensor, range -5 to +45 °C, resolution 0.05 °C, accuracy 0.2 °C, response time at 63 per cent 1 min (1.5 sec thermistor or 60msec platinum).
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Optional conductive conductivity sensor, range 5 to 70mS/cm, resolution 0.1mS/cm, accuracy 0.2mS/cm (optional inductive sensor, range 1 to 70mS/cm).
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Optional semiconductor strain gauge pressure sensor, range 0 to 1000dBar (70M option), resolution 1dBar (4mm with 70M option), accuracy 0.25 per cent fs.
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Recorder, CMOS static RAM microprocessor, 64KByte (128K or 256KByte optional) performs vector averaging, burst sampling and adaptive sampling.
Available versions of the S4 are listed in the table below:
S4RT | Basic S4 current meter without memory installed, for real-time monitoring applications only. |
S4 | The basic S4 current measuring instrument, with current speed and direction sensors and internal memory from 64K to 1 megabyte of solid-state memory. |
S4DW | S4 current meter directional wave measuring instrument. Includes 1 megabyte of memory, 70 meter high-resolution depth, adaptive sampling, and Lithium battery pack, standard. |
S4P | S4 instrument outfitted for profiling applications. Fitted with fast response Platinum temperature sensor, inductive flow- through conductivity sensor, and high-resolution depth sensor as standard. Memory size may be from 64K to 1 megabyte. |
S4D | Deep water S4 instrument for use to depths of 6,000 meters. |
S4A | Advanced current measuring instrument with large memory capacity, and dual-mode logging capability. Memory size may be 32-256 megabytes. Includes high speed binary down-loads using Zmodem protocol with 32 bit CRC error checking. Adaptive current sampling is standard on this instrument. |
S4ADW | Large memory capacity S4 directional wave measuring instrument. Includes 32 to 256 megabyte memory, 70 meter high-resolution depth sensor, and Lithium battery pack, standard. |
S4ADW-i | New generation of S4ADW directional wave measuring instrument providing internally-processed directional wave data for direct output from the instrument without the need for external analysis software. Ideal multi-purpose oceanographic instrument for integrated-system applications requiring pre-processed output directly into a datalogger, PLC, modem, or other external device without need for PC computer. Used for directional wave, current, and tide measurements, with additional parameters available. Includes long-life lithium battery, and internal memory sizes from 32MB to 256MB. |
S4AP | An S4A instrument outfitted for profiling applications. Fitted with fast response Platinum temperature sensor, inductive flow-through conductivity sensor, and high- resolution depth sensor, standard. Memory size may be 32-256 megabytes. |
S4AD | Deep water S4A instrument for use to depths of 6,000 meters. Has all the same features and options as available with the standard S4A. |
S4AH | Same as S4A but uses 5 Hz sampling rate instead of 2 Hz. S4AHDW, S4AHP, S4AHD are 5 Hz models of the units listed above. |
Further details are available from the manufacturer's specification sheet.
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:
- Irregularities such as unfeasible values
- Inconsistencies between related information. For example:
- Depths of meter and sea bed.
- Times for mooring deployment and for start/end of data series.
- Length of record or number of data cycles, the cycle interval, the clock error and the period over which accrued.
- Parameters stated as measured 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 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:
- 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, 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:
- Maximum and minimum values of parameters (spikes excluded).
- The orientation and symmetry of the current vector scatter plot.
- The direction of rotation of the current vectors.
- The approximate amplitude and periodicity of the tidal currents.
- The occurrence of meteorological events and, finally, for series for which no time check was possible, the phase.
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 comma separated value ASCII format files. Since the originator files contained several deployment data, BODC split the data per deployment and instrument. Files were renamed with the format: M/year/month/depth(3 digits)/Deployment. For example, M9801040D1.DAT contains data from the mooring from the current meter at 40m depth in January 1998 during the first deployment.
RCM1CURR.DAT was split into 2 files as follows:
- M9801040D1.DAT: from 04/01/1998 12:30:00 to 26/02/1998 11:50:00
- M9802040D2.DAT: from 24/02/1998 01:40:00 to 04/04/1998 09:00:00
RCM2CURR.DAT was split into 2 files as follows:
- M9801140D1.DAT: from 04/01/1998 12:30:00 to 26/02/1998 11:50:00
- M9802140D2.DAT: from 24/02/1998 01:40:00 to 04/04/1998 09:00:00
RCM3CURR.DAT was split into 2 files as follows:
- M9801290D1.DAT: from 04/01/1998 12:30:00 to 26/02/1998 11:50:00
- M9802290D2.DAT: from 24/02/1998 01:40:00 to 04/04/1998 09:00:00
Data of RCM4CURR.DAT from 04/01/1998 12:30:00 to 26/02/1998 11:50:00 were copied to M9801435D1.DAT. Data from the second deployment at 435m depth were provided by the originator but were not transferred because only absent values were present.
These series were reformatted to the internal QXF format using BODC transfer function 420. 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 | days | AADYAA01 + AAFDZZ01 | day number and day fraction | Conversion by transfer | |
CURR_DIRN | degrees true | 2 minutes averaging | LCDAEL01 | degrees true | |
CURR_SPEED | m.s-1 | 2 minutes averaging | LCSAEL01 | cm.s-1 | Conversion (RAW * 100) by transfer |
VELOC_EAST | m.s-1 | 2 minutes averaging | LCEWEL01 | cm.s-1 | Conversion (RAW * 100) by transfer |
VELOC_NORTH | m.s-1 | 2 minutes averaging | LCNSEL01 | cm.s-1 | Conversion (RAW * 100) by transfer |
TEMP | degrees Celsius | 2 minutes averaging | TEMPPR01 | degrees Celsius | |
SAL | dimensionless | derived from conductivity and temperature, 2 minutes averaging * | PSALPR01 | dimensionless | |
HEAD | meter | 2 minutes averaging | ADEPZZ01 | meter | |
INSTR_DIRN | degrees | 2 minutes averaging | HEADCMMG | degrees |
* The originator did not specify how salinity was calculated.
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) | 1998-01-04 |
End Date (yyyy-mm-dd) | 1998-02-26 |
Organization Undertaking Activity | Total (now Total S.A.) |
Country of Organization | France |
Originator's Data Activity Identifier | Myanmar#1 |
Platform Category | subsurface mooring |
SIMORC Mooring Myanmar#1
This particular mooring was deployed on 04/01/1998 and was removed on 26/02/1998. It was set from a subsurface mooring on behalf of TOTAL in Myanmar, Block 8 and consisted of the following instruments.
Depth below MSL(m) | Instrument type | Serial Number | Deployment start | Deployment end | Comments |
---|---|---|---|---|---|
40 | Interocean S4 | 2114 | 04/01/1998 12:30:00 | 26/02/1998 11:50:00 | |
70 | RD INSTRUMENTS 300 kHz Workhorse ADCP | 365 | 04/01/1998 12:30:00 | 17/02/1998 10:30:00 | |
60 | Seamon Mini | D111 | 04/01/1998 12:00:00 | 15/02/1998 17:57:00 | |
80 | Seamon Mini | D105 | 04/01/1998 | 15/02/1998 | Data not provided as there was an instrument malfunction. |
100 | Seamon Mini | D109 | 04/01/1998 12:00:00 | 15/02/1998 17:57:00 | |
120 | Seamon Mini | D118 | 04/01/1998 12:00:00 | 15/02/1998 17:57:00 | |
140 | Seamon C/T | 009C70 | 04/01/1998 12:39:00 | 24/02/1998 01:30:00 | |
140 | Interocean S4 | 2115 | 04/01/1998 12:30:00 | 26/02/1998 11:50:00 | |
160 | Seamon Mini | D114 | 04/01/1998 12:00:00 | 15/02/1998 17:57:00 | |
180 | Seamon Mini | D106 | 04/01/1998 12:00:00 | 15/02/1998 17:57:00 | |
200 | Seamon Mini | D113 | 04/01/1998 12:00:00 | 15/02/1998 17:57:00 | |
240 | Seamon Mini | D107 | 04/01/1998 12:00:00 | 15/02/1998 17:57:00 | |
290 | Interocean S4 | 1677 | 04/01/1998 12:30:00 | 26/02/1998 11:50:00 | |
340 | Seamon Mini | D117 | 04/01/1998 12:00:00 | 15/02/1998 17:57:00 | |
390 | Seamon Mini | D116 | 04/01/1998 12:00:00 | 15/02/1998 17:57:00 | |
430 | RD Instruments 75 kHz Broadband ADCP | 2356 | 04/01/1998 12:30:00 | 24/02/1998 01:30:00 | |
435 | Interocean S4 | 0545 | 04/01/1998 12:30:00 | 26/02/1998 11:50:00 |
Where MSL = Mean Sea Level
Related Data Activity activities are detailed in Appendix 1
Fixed Station Information
Fixed Station Information
Station Name | MYANMAR |
Category | Offshore location |
Latitude | 14° 12.22' N |
Longitude | 94° 9.62' E |
Water depth below MSL | 440.0 m |
SIMORC: TOTAL Myanmar Fixed Station Document
This site is part of the TOTAL offshore facility and consists of a drilling location in Block M8, offshore Myanmar.
2 moorings consisting of 4 current meters, 2 ADCPs, 1 WLR and 12 temperature recorders were deployed from a subsurface mooring.
The nominal position of the site is 14° 12' 13''N, 94° 09' 37''E. The water depth is 440 m.
Current data were collected by Fugro Geos on behalf of TOTAL from Myanmar Station as follows:
Rig / Instrument Identification | Meter Type | Start Date | End Date | Comments |
---|---|---|---|---|
MYANMAR#1 | CM, HRCD | 04/01/1998 | 24/02/1998 | |
MYANMAR#2 | CM, HRCD | 26/02/1998 | 04/04/1998 |
A CTD cast was done before the recovery of the last mooring.
Where
- CM = Current Meter
- ADCP = Acoustic Doppler Current Profiler
- WLR = Water Level Recorder
- HRCD = Hydrography time series at depth
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:
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 |
B | nominal value |
Q | value below limit of quantification |
Appendix 1: Myanmar#1
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.
Series Identifier | Data Category | Start date/time | Start position | Cruise |
---|---|---|---|---|
932269 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
932270 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
932294 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
932301 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
932313 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
932325 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
932337 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
932349 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
932350 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
768861 | Currents -subsurface Eulerian | 1998-01-04 12:30:00 | 14.20328 N, 94.16078 E | Not applicable |
768885 | Currents -subsurface Eulerian | 1998-01-04 12:30:00 | 14.20328 N, 94.16078 E | Not applicable |
768897 | Currents -subsurface Eulerian | 1998-01-04 12:30:00 | 14.20328 N, 94.16078 E | Not applicable |
951636 | Currents -subsurface Eulerian | 1998-01-04 12:30:00 | 14.2036 N, 94.1603 E | Not applicable |
951661 | Currents -subsurface Eulerian | 1998-01-04 12:30:00 | 14.2036 N, 94.1603 E | Not applicable |
932282 | Hydrography time series at depth | 1998-01-04 12:39:00 | 14.20328 N, 94.16078 E | Not applicable |
Appendix 2: MYANMAR
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.
Series Identifier | Data Category | Start date/time | Start position | Cruise |
---|---|---|---|---|
932269 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
932270 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
932294 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
932301 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
932313 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
932325 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
932337 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
932349 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
932350 | Hydrography time series at depth | 1998-01-04 12:00:00 | 14.20362 N, 94.16028 E | Not applicable |
768861 | Currents -subsurface Eulerian | 1998-01-04 12:30:00 | 14.20328 N, 94.16078 E | Not applicable |
768885 | Currents -subsurface Eulerian | 1998-01-04 12:30:00 | 14.20328 N, 94.16078 E | Not applicable |
768897 | Currents -subsurface Eulerian | 1998-01-04 12:30:00 | 14.20328 N, 94.16078 E | Not applicable |
951636 | Currents -subsurface Eulerian | 1998-01-04 12:30:00 | 14.2036 N, 94.1603 E | Not applicable |
951661 | Currents -subsurface Eulerian | 1998-01-04 12:30:00 | 14.2036 N, 94.1603 E | Not applicable |
932282 | Hydrography time series at depth | 1998-01-04 12:39:00 | 14.20328 N, 94.16078 E | Not applicable |
768904 | Currents -subsurface Eulerian | 1998-02-24 01:40:00 | 14.20388 N, 94.16 E | Not applicable |
768916 | Currents -subsurface Eulerian | 1998-02-24 01:40:00 | 14.20388 N, 94.16 E | Not applicable |
768928 | Currents -subsurface Eulerian | 1998-02-24 01:40:00 | 14.20388 N, 94.16 E | Not applicable |
951673 | Currents -subsurface Eulerian | 1998-02-26 11:54:00 | 14.2036 N, 94.1603 E | Not applicable |
932386 | Hydrography time series at depth | 1998-02-26 12:00:00 | 14.20328 N, 94.16078 E | Not applicable |
932430 | Hydrography time series at depth | 1998-02-26 12:18:00 | 14.20328 N, 94.16078 E | Not applicable |
932362 | Hydrography time series at depth | 1998-02-26 13:03:00 | 14.20362 N, 94.16028 E | Not applicable |
932374 | Hydrography time series at depth | 1998-02-26 13:03:00 | 14.20362 N, 94.16028 E | Not applicable |
932398 | Hydrography time series at depth | 1998-02-26 13:03:00 | 14.20362 N, 94.16028 E | Not applicable |
932405 | Hydrography time series at depth | 1998-02-26 13:03:00 | 14.20362 N, 94.16028 E | Not applicable |
932417 | Hydrography time series at depth | 1998-02-26 13:03:00 | 14.20362 N, 94.16028 E | Not applicable |
932429 | Hydrography time series at depth | 1998-02-26 13:03:00 | 14.20362 N, 94.16028 E | Not applicable |
932442 | Hydrography time series at depth | 1998-02-26 13:03:00 | 14.20362 N, 94.16028 E | Not applicable |
932454 | Hydrography time series at depth | 1998-02-26 13:03:00 | 14.20362 N, 94.16028 E | Not applicable |
932466 | Hydrography time series at depth | 1998-02-26 13:03:00 | 14.20362 N, 94.16028 E | Not applicable |
932478 | Hydrography time series at depth | 1998-02-26 13:03:00 | 14.20362 N, 94.16028 E | Not applicable |
951648 | Currents -subsurface Eulerian | 1998-02-26 15:00:00 | 14.2036 N, 94.1603 E | Not applicable |
934786 | CTD or STD cast | 1998-04-04 19:34:00 | 14.20362 N, 94.16028 E | MV Norwich Service 1998 |