Metadata Report for BODC Series Reference Number 934786


Metadata Summary

Data Description

Data Category CTD or STD cast
Instrument Type
NameCategories
Sea-Bird SBE 19 SEACAT CTD  CTD; water temperature sensor; salinity sensor
Instrument Mounting vessel of opportunity on fixed route
Originating Country France
Originator Dr Valerie Quiniou-Ramus
Originating Organization Total (now Total S.A.)
Processing Status banked
Project(s) SIMORC
 

Data Identifiers

Originator's Identifier MYANMARCTD98
BODC Series Reference 934786
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1998-04-04 19:34
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval 0.5 seconds
 

Spatial Co-ordinates

Latitude 14.20362 N ( 14° 12.2' N )
Longitude 94.16028 E ( 94° 9.6' E )
Positional Uncertainty 0.01 to 0.05 n.miles
Minimum Sensor Depth 0.15 m
Maximum Sensor Depth 363.58 m
Minimum Sensor Height 76.42 m
Maximum Sensor Height 439.85 m
Sea Floor Depth 440.0 m
Sensor Distribution Variable common depth - All sensors are grouped effectively at the same depth, but this depth varies significantly during the series
Sensor Depth Datum Mean sea level - Depth expressed relative to mean sea level as defined by the data originator
Sea Floor Depth Datum Unspecified -
 

Parameters

BODC CODE Rank Units Short Title Title
ACYCAA01 1 Dimensionless Record_No Sequence number
CNDCST01 1 Siemens per metre CTDCond Electrical conductivity of the water body by CTD
PRESPR01 1 Decibars Pres_Z Pressure (spatial co-ordinate) exerted by the water body by profiling pressure sensor and corrected to read zero at sea level
PSALST01 1 Dimensionless P_sal_CTD Practical salinity of the water body by CTD and computation using UNESCO 1983 algorithm
TEMPS601 1 Degrees Celsius CTDTmp68 Temperature (IPTS-68) of the water body by CTD or STD
TEMPS901 1 Degrees Celsius CTDTmp90 Temperature (ITS-90) of the water body by CTD or STD
 

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

Data quality report of MYANMARCTD98

Several datacycles were flagged at the end of the upcast, as the instrument seemed to be at the surface.


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

Sea-Bird SBE 19 and SBE 19plus SEACAT Profiler CTDs

The SBE 19 SEACAT Profiler is a self-contained, battery powered, pumped CTD system designed to measure conductivity, temperature, and pressure in marine or fresh water environments to depths of 10,500 meters. It was replaced by the SBE 19 plus model in 2001. An updated version of this instrument is the SBE 19 plus V2, which incorporates an electronics upgrade and additional features, with six differentially amplified A/D input channels, one RS-232 data input channel, and 64 MB FLASH memory.

The standard CTD unit comes with a plastic housing (rated to 600 m), although this can be replaced by titanium housing for depths up to 7000 m. It is typically used for CTD profiling although a conversion kit is available for mooring deployments. The CTD can also be attached to an SBE 36 CTD Deck Unit and Power/Data Interface Module (PDIM) for real-time operation on single-core armored cable up to 10,000 m.

Specifications

Parameter SBE 19 SBE 19 plus
Temperature

Range: -5 to +35 °C

Accuracy: 0.01 °C

Resolution: 0.001 °C

Calibration: +1 to +32 °C*

Range: -5 to +35 °C

Accuracy: 0.005 °C

Resolution: 0.0001 °C

Calibration: +1 to +32 °C*

Conductivity

Range: 0 to 7 S m -1 (0 to 70 mmho cm -1 )

Accuracy: 0.001 S m -1

Resolution: 0.0001 S m -1

Calibration: 0 to 7 S m -1 . Physical calibration over the range 1.4 - 6 S m -1 *

Range: 0 to 9 Sm -1

Accuracy: 0.0005

Resolution: 0.00005 (most oceanic waters, resolves 0.4 ppm in salinity); 0.00007 (high salinity waters, resolves 0.4 ppm in salinity); 0.00001 (fresh waters, resolves 0.1 ppm in salinity)

Calibration: 0 to 9 S m -1 . Physical calibration over the range 1.4 - 6 S m -1 *

Strain gauge pressure sensor

Range: 0 to100, 150, 300, 500, 1000, 1500, 3000, 5000, 10000 or 15000 psia

Accuracy: 0.25% of full scale range (100 - 1500 psia); 0.15% of full scale range (3000 - 15000 psia)

Resolution: 0.015% of full scale

Calibration: 0 to full scale in 20% steps

Range: 0 to 20, 100, 350, 1000, 2000, 3500 or 7000 m

Accuracy: 0.1% of full scale range

Resolution: 0.002% of full scale range

Calibration: ambient pressure to full scale range in 5 steps

*Measurements outside this range may be at slightly reduced accuracy due to extrapolation errors.

Options and accessories

Additional sensors can be attached to the CTD, including:

The standard SBE 5M pump may be replaced by an SBE 5P (plastic housing) or 5T (titanium housing) pump for use with dissolved oxygen and/or other pumped sensors. Further details can be found in the manufacturer's SBE 19 plus V2 instrument specification or the SBE 19 and SBE 19 plus user guides.

BODC CTD 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 that cannot be resolved.

Data cycles are inspected using depth series plots of all parameters. These presentations undergo screening to detect infeasible values within the data cycles themselves and inconsistencies when comparing 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 that 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.

The following types of inconsistency are detected automatically by software:

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 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's making are not introduced.

BODC Processing

The originator provided a Comma Separated Values format file. This series was reformatted to the internal QXF format using BODC transfer function 422. 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 DD/MM/YYYY HH:MI date and time AADYAA01 + AAFDZZ01 day number and day fraction GMT Conversion by transfer
temp_90 degrees Celsius Temperature (ITS-90) TEMPS901 degrees Celsius  
salinity psu Practical salinity PSALST01 psu  
conduct mmho.cm -1 Electrical conductivity CNDCST01 S.m -1 Conversion (RAW * 0.1) by transfer
press decibars pressure PRESPR01 decibars  
temp_68 degrees Celsius Temperature (IPTS-68) TEMPS601 degrees Celsius  

Datacycles 1 to 1123 were deleted as only the upcast was transferred. The decision to transfer the upcast in favour of the dowcast was based on an assessment of data quality of each.

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


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

Cruise

Cruise Name 1998
Departure Date 1998-04-04
Arrival Date 1998-04-04
Principal Scientist(s)
Ship MV Norwich Service

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameMYANMAR
CategoryOffshore location
Latitude14° 12.22' N
Longitude94° 9.62' E
Water depth below MSL440.0 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


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