Metadata Report for BODC Series Reference Number 698775


Metadata Summary

Data Description

Data Category Hydrography time series at depth
Instrument Type
NameCategories
Sea-Bird SBE 16Plus SEACAT C-T Recorder  water temperature sensor; salinity sensor
Seapoint Turbidity Meter  optical backscatter sensors
Instrument Mounting fixed benthic node
Originating Country United Kingdom
Originator Mr John Howarth
Originating Organization Proudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool)
Processing Status banked
Project(s) Coastal Observatory
 

Data Identifiers

Originator's Identifier MX04736.936
BODC Series Reference 698775
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2005-07-14 07:00
End Time (yyyy-mm-dd hh:mm) 2005-08-18 10:10
Nominal Cycle Interval 600.0 seconds
 

Spatial Co-ordinates

Latitude 53.45367 N ( 53° 27.2' N )
Longitude 3.64733 W ( 3° 38.8' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor Depth 26.3 m
Maximum Sensor Depth 26.3 m
Minimum Sensor Height 0.5 m
Maximum Sensor Height 0.5 m
Sea Floor Depth 26.8 m
Sensor Distribution Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
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
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
CNDCPR01 1 Siemens per metre InSituCond Electrical conductivity of the water body by in-situ conductivity cell
PREXPS01 1 Decibars MeasPress_SL Pressure (measured variable) exerted by the water body by fixed in-situ pressure sensor and corrected to read zero at sea level
PSALPR01 1 Dimensionless P_sal Practical salinity of the water body by conductivity cell and computation using UNESCO 1983 algorithm
TEMPPR01 1 Degrees Celsius Temp Temperature of the water body
TURBSP01 1 Nephelometric Turbidity Units Turb Turbidity of the water body by SeaPoint turbidity meter and laboratory calibration against formazin
 

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

Originator's quality control comments for PD25_05 COBS moorings

Data supplied to BODC were accompanied by data quality notes from the Originator that detailed observations made when the data were processed and subsequent processing decisions. A summary of these notes have been provided in the tables below.

Rig#932

Instrument Serial number Instrument depth Data quality comments
Sea-Bird MicroCAT 02991 5 m Comparisons performed against CTD data found a temperature offset of +0.026°C. This offset was changed by -0.02°C after comparing these data with the data from other instruments at this site, resulting in an overall offset correction of -0.006°C being applied. There was no conductivity offset at deployment, however a slight drift of -0.006 S m-1 was observed at mooring recovery. No adjustments were made to the conductivity data.
Aanderaa RCM 11814 10 m There were no quality issues with the quality of the conductivity data, however it was recorded in low resolution. A temperature offset of -0.01°C was found after comparing these data with the data recorded by the other instruments at this site. An offset correction of +0.01°C has been applied to the temperature data. The pressure data recorded by this sensor was unrealistic and has been converted into absent data values. The Data Originator recommends that these data are used with caution.

Rig#933


Instrument Serial number Instrument depth Data quality comments
Sea-Bird 16+ SEACAT fitted with Seapoint Turbidity Meter 10490 04738 Located on seabed Comparisons performed against CTD data found offsets with minimum values of -0.0109 S m-1 in conductivity and -0.020°C in temperature. The conductivity data have been adjusted by +0.0109 S m-1 and all temperature values have been changed by +0.020°C to compensate for these offsets.
Teledyne RDI 600 kHz ADCP 5803 Located on seabed To correct for the magnetic declination (difference between magnetic north and true north) latitude values were changed by -3.9894°. All latitude values were modified by +1.1719° to correct for the compass error.

Rig#935


Instrument Serial number Instrument depth Data quality comments
Sea-Bird MicroCAT 02010 5 m Comparisons performed against CTD data found an offset of 0.0600 S m-1 at deployment falling to 0.001 S m-1 at recovery. No adjustments have been made to this channel because the size of the offset is minimal at mooring recovery. There was a large temperature offset of 1.2°C at deployment, falling to +0.038°C at recovery. An offset correction of-0.038°C has been applied to these data. After comparing the data from this instrument with the other instruments present at this site, an offset correction of -0.01 has been applied to the salinity data.
Aanderaa RCM 09631 10 m Comparisons performed against CTD found variable offsets in temperature and conductivity which were large at deployment and recovery, although the quality of these data was better in the middle of the series. The separation distance between mooring and CTD was less than 600 m during both the deployment and recovery CTD checks. The minimum temperature offset observed in the CTD comparison checks was +0.043°C, however this offset was changed to +0.023°C after comparing the data from this sensor with the other temperature data from this site. An offset correction of -0.023°C has been applied to the temperature data. No adjustments have been made to the conductivity channel.

Rig#936


Instrument Serial number Instrument depth Data quality comments
Sea-Bird 16+ SEACAT fitted with Seapoint Turbidity Meter 10320 04736 Located on seabed Comparisons performed against CTD data found an offset with a minimum value of -0.0054 S m-1 in the conductivity channel. An offset correction of +0.0054 S m-1 has been applied to this channel. No problems were found with the temperature data from this series.
Teledyne RDI 600 kHz ADCP 5806 Located on seabed To correct for the magnetic declination (difference between magnetic north and true north) latitude values were changed by -4.1024°. All latitude values were modified by +2.6759° to correct for the compass error.

Data Access Policy

Open Data supplied by Natural Environment Research Council (NERC)

You must always use the following attribution statement to acknowledge the source of the information: "Contains data supplied by Natural Environment Research Council."


Narrative Documents

Data Processing: NOCL Sea-Bird SBE 16plus SEACAT with Seapoint Turbidity Sensor

Data Originator's Processing

Data were downloaded by the Proudman Oceanographic Laboratory (POL) (since 01 April 2010, the National Oceanography Centre Liverpool (NOCL)) from the instrument logger, and factory calibrations were applied to the temperature and conductivity channels. The instruments are returned to the manufacturer for recalibration approximately every two years. The data were then reformatted by POL/NOCL to a standard ASCII format.

Before the data were supplied to BODC, basic quality control was performed by the Data Originator. The first stage of quality checks involved comparing the data from each instrument with CTD measurements recorded during the deployment and recovery of the mooring. Following the comparison against CTD data secondary checks were performed by comparing the data from each instrument against the data from other sensors attached to that mooring. The Originator has provided BODC with a document containing a full description of the quality control methodology . Depending on the result of the quality checks for each series, one of the following actions was performed by the Originator:

A full description of the results of these quality checks can be found in the relevant Originator's data processing comments document.

Sea-Bird SBE 16plus SEACAT

The SBE 16 plus is a high accuracy conductivity and temperature recorder (pressure optional). It is designed for moorings and other long-duration, fixed-site deployments. The SBE 16 plus has 6 amplified A/D input channels and conditioned power of 500 ma is avaliable for auxiliary sensors, dissolved oxygen, turbidity, fluorescence, PAR etc.

The SBE 16 plus is available with a choice of RS-232 or RS-485 interface.

Sensor specifications

  Temperature
(°C)
Conductivity (S m -1 ) Optional Pressure - strain Gauge Optional Pressure - Quartz
Measurement Range -5 to +35 0 to 9 0 to full scale range: 20 / 100 / 350 / 1000 / 1600 / 2000 / 3500 / 7000 metres 0 to full scale range: 20 / 60 / 130 / 200 / 270 / 680 / 1400 / 2000 / 4200 / 7000 / 10500 metres
Initial accuracy 0.005 0.0005 0.1% (RS-232)/0.04% (RS-485) of full scale range 0.02% (RS-232)/0.002% (RS-485) of full scale range
Typical Stability 0.0002 0.0003 0.05% (RS-232)/0.1% (RS-485) of full scale range 0.025% of full scale range
Resolution 0.0001 0.00005 typical 0.002% of full scale range Depends on sample integration, 0.0006% of full scale range for 1 s integration
Sensor Calibration +1 to +32 0 to 9; physical calibration over range 2.6 to 6.5 S m -1 plus zero conductivity (air) Ambient pressure to full scale range in 5 steps Ambient pressure to full scale range in 5 steps

General information

Memory 8 MB FLASH memory (RS-232); 64 MB FLASH memory (RS-485)
Data Storage Converted temperature and conductivity: 6 bytes per sample. Time: 4 bytes per sample. Pressure (optional): 5 bytes per sample
Real-Time Clock Watch-crystal type 32,768 Hz; accuracy (±1 minutes/year)
Standard Internal Batteries 9 alkaline D-cells. Provides sufficient capacity for 145,000 samples for a CTD and 5M pump
Housing Titanium pressure case rated at 7000 metres
Weight (without pressure) In water: 8.6 kg/In air: 13.7 kg

Further information can be found in the instrument manual

Seapoint Turbidity Meter

The Seapoint Turbidity Meter detects light scattered by particles suspended in water, generating an output voltage proportional to turbidity or suspended solids. Range is selected by two digital lines which can be hard wired or microprocessor controlled, thereby choosing the appropriate range and resolution for measurement of extremely clean to very turbid waters. The offset voltage is within 1 mV of zero and requires no adjustment across gains. The optical design confines the sensing volume to within 5 cm of the sensor allowing near-bottom measurements and minimizing errant reflections in restricted spaces.

Sensor specifications, current at August 2006, are given in the table below.

Sensor Specifications

Power requirements 7 - 20 VDC, 3.5 mA avg., 6 mA pk.
Output 0 - 5.0 VDC
Output Time Constant 0.1 sec.
RMS Noise> < 1 mV
Power-up transient period < 1 sec.
Light Source Wavelength 880 nm
Sensing Distance (from windows) < 5 cm (approx.)
Linearity < 2% deviation 0 - 750 FTU

  Gain Sensitivity (mV FTU -1 ) Range (FTU)
Sensitivity/Range 100x
20x
5x
1x
200
40
10
2
25
125
500
**

** output is non-linear above 750 FTU.

Further details can be found in the manufacturer's specification sheet .

Processing of Seabird 16plus SEACAT with Seapoint Turbidity Sensor data by BODC

The data were provided to BODC in ASCII format, and the series were reformatted into BODC standard internal format using a transfer function. The following table shows how the Originator's variables present in the Seapoint 16 plus data were mapped to the appropriate BODC parameter codes.

Originator's Variable Units Description BODC Parameter Code Units Comments
Temperature °C Temperature of the water column TEMPPR01 °C -
Conductivity S m -1 Electrical conductivity of the water column by in-situ conductivity cell CNDCPR01 S m -1 -
Pressure dbar Pressure exerted by the water column PREXPS01 dbar -
Turbidity FTU Turbidity of the water column by Seapoint turbidity meter and laboratory calibration against formazin TURBSP01 NTU FTU=NTU
Salinity None Practical salinity of the water column by conductivity cell and computation using UNESCO 1983 algorithm PSALPR01 None -

The reformatted data were visualised using the in-house EDSERPLO software. Suspect data were marked by adding an appropriate quality control flag, missing data by both setting the data to an appropriate value and setting the quality control flag.

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:

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:

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:

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

Proudman Oceanographic Laboratory Coastal Observatory

The Coastal Observatory was established by Proudman Oceanographic Laboratory as a coastal zone real time observing and monitoring system. The main objective is to understand a coastal sea's response both to natural forcing and to the consequences of human activity. Near real-time measurements will be integrated with coupled models into a pre-operational coastal prediction system whose results will be displayed on the World Wide Web.

The Observatory is expected to grow and evolve as resources and technology allow, all the while building up long time series. A site selection pilot study was carried out in September 2001 and the Observatory became operational in August 2002.

The site is located in Liverpool Bay and is subject to typical coastal sea processes, with strong tides, occasional large storm surges and waves, freshwater input, stable and unstable stratification, high suspended sediment concentration and biogeochemical interaction. Measurements and monitoring will focus on the impacts of storms, variations in river discharge (especially the Mersey), seasonality and blooms in Liverpool Bay.

A variety of methods will be used to obtain measurements, including:

  1. Moored instruments for in situ time series of currents, temperature and salinity profiles, and surface waves and meteorology. It is hoped that turbidity and chlorophyll measurements will be made at another site as the Observatory progresses;
  2. The Cefas Smartbuoy for surface properties such as nutrients and chlorophyll, starting late 2002;
  3. R.V. Prince Madog to carry out spatial surveys and service moorings;
  4. Instrumented ferries for near surface temperature, salinity, turbidity, chlorophyll and nutrients. The first route will be Liverpool to Douglas, Isle of Man, starting late 2002;
  5. Drifters for surface currents and properties such as temperature and salinity, starting in 2004;
  6. Tide gauges, with sensors for meteorology, waves, temperature and salinity, where appropriate;
  7. Meteorological data from Bidston Observatory and Hilbre Island, HF radar and tide gauge sites;
  8. Shore-based HF radar measuring waves and surface currents out to a range of 50 km, starting in 2003;
  9. Satellite data, with infrared for sea surface temperature and visible for chlorophyll and suspended sediment.

The partners currently involved with the project are listed below:

A summary of Coastal Observatory cruises to date on R.V. Prince Madog is given in the table below:

Year No. of cruises Work summary
2001 1 Site selection and pilot study. 95 CTD casts.
2002 4 POL moorings deployed and serviced
Cefas Waverider and SmartBuoy deployed and serviced
103 CTD casts
2003 10 POL moorings serviced
Cefas Waverider and SmartBuoy serviced
341 CTD/LISST casts
2004 9 POL moorings serviced
Cefas Waverider and SmartBuoy serviced
347 CTD/LISST casts
2005 9 POL moorings serviced
Cefas Waverider and SmartBuoy serviced
268 CTD/LISST casts
2006 11 POL moorings serviced
Cefas Waverider and SmartBuoy serviced
508 CTD/LISST casts
2007 9 POL moorings serviced
Cefas Waverider and SmartBuoy serviced
471 CTD/LISST casts
2008 9 POL moorings serviced
Cefas Waverider and SmartBuoy serviced
260 CTD/LISST casts
2009 7 POL moorings serviced
Cefas Waverider and SmartBuoy serviced
213 CTD/LISST casts
2010 8 POL moorings serviced
Cefas Waverider and SmartBuoy serviced
268 CTD/LISST casts
2011 6 POL moorings serviced
Cefas Waverider and SmartBuoy serviced
307 CTD/LISST casts to date, ongoing

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2005-07-14
End Date (yyyy-mm-dd) 2005-08-18
Organization Undertaking ActivityProudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool)
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierPOLRIG936
Platform Categoryfixed benthic node

Proudman Oceanographic Laboratory Rig#936

Deployment and Recovery

This rig was deployed as part of the Liverpool Bay Coastal Observatory during R.V. Prince Madog cruise PD25_05. Conditions during deployment were calm; the winds were slight and variable (force 1). Recovery of the rig took place during R.V. Prince Madog cruise PD30_05. Weather conditions were good.

Rig Position 53.454°, -3.647°
Water Depth 26.8 m
Deployed 14 July 2005 06:55:00 GMT
Recovered 18 August 2005 10:35:00 GMT
No. of Days 35

Rig Description

This rig is a bottom frame comprising of the following instruments 0.5 m above the seabed; Waves Acoustic Doppler Current Profiler (ADCP) and a Sea-Bird 16plus. The frame (D6) was fitted with two Benthos releases (70354 - Rx 13.0 kHz, Tx 12.0 kHz, enable C, release D and (serial number uncertain) - Rx 11.5 kHz, Tx 12.0 kHz, enable F, release D) with fizz links and a spooler with 200 m of rope for recovery of the ballast weight.


Instrument Serial Number Parameters Measured Sampling Description Comments
RDI Waves ADCP 600 kHz 5806 Horizontal current velocity components
Vertical current velocity components
Sea surface height
Mode 1: 100 pings every 10 minutes (velocity standard deviation 0.007 m s-1).
35 x 1 m bins (2.65 - 36.65 m above the bed)
Sound velocity calculated from temperature, depth and salinity of 32.
Fitted with a pressure sensor and 1 Gbyte PCMCIA memory; hourly wave recording enabled.
Upon recovery the clock was found to be running 1 min 5 s fast.
Sea-Bird 16plus V RS-485 1.0 4736 Temperature
Conductivity
Pressure
Turbidity
Sample interval 600 s. Fitted to base of frame with pumped conductivity sensor underneath.
SeaPoint turbidity sensor: S/N 10320 taped to roll bar; set up for 0 - 125 FTU range.
Upon recovery the clock was found to be running 3 s slow.

Other Series linked to this Data Activity - 1622823

Cruise

Cruise Name PD25/05
Departure Date 2005-07-13
Arrival Date 2005-07-14
Principal Scientist(s)Phil J Knight (Proudman Oceanographic Laboratory)
Ship RV Prince Madog

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameCoastal Observatory Site 21
CategoryOffshore location
Latitude53° 27.13' N
Longitude3° 38.48' W
Water depth below MSL25.0 m

Liverpool Bay Coastal Observatory Site 21

This station is one of 34 stations regularly visited by the Proudman Oceanographic Laboratory (POL) as part of the Liverpool Bay Coastal Observatory. The main activity at this site are CTD profiles (since August 2002) which are taken during each site visit. This station was also the secondary mooring site (also referred to as Site B) for the Coastal Observatory project between April 2005 and March 2010. After March 2010 the moorings were moved to site 20. The station lies within a box of mean water depth 24 m with the following co-ordinates:

Box Corner Latitude (+ve North) Longitude (+ve East)
North-west corner 53.46028 -3.658
South-east corner 53.44249 -3.6105

The position of this station relative to the other POL Coastal Observatory sites can be seen from the figure below.

BODC image

Mooring Deployment History

2010

Rig Type Typical Instruments Rig IDs Comment
Frame ADCP, CTD, OBS, Telemetry ADCP 1088, 1092, 1096, 1100, 1104, 1107, 1111 January - December
SmartBuoy CT, FL, OBS, BD 1087, 1091, 1095, 1099, 1103, 1110, 1115 January - December

2009

Rig Type Typical Instruments Rig IDs Comment
Frame ADCP, CTD, OBS, Telemetry ADCP 1057, 1065, 1069, 1072, 1076, 1080, 1084 January - December
SmartBuoy CT, FL, OBS, BD 1056, 1064, 1068, 1075, 1079, 1083 January - December

2008

Rig Type Typical Instruments Rig IDs Comment
Frame ADCP, CTD, OBS, Telemetry ADCP 1026, 1030, 1033, 1038, 1053 January - December
SmartBuoy CT, FL, OBS, BD LB2_023/1025, LB2_024/1029, LB2_025/1034, LB2_026/1037, LB2_029/1052 January - December

2007

Rig Type Typical Instruments Rig IDs Comment
Frame ADCP, CTD, OBS, Telemetry ADCP 992, 999, 1002, 1007, 1012, 1019 January - December
SmartBuoy CT, FL, OBS, BD 991, LB2_016/998, LB2_017/1003, LB2_018/1006, LB2_019/1011, LB2_020/1015, LB2_021/1018, LB2_022/1022 January - December

2006

Rig Type Typical Instruments Rig IDs Comment
Frame ADCP, CTD, OBS, Telemetry ADCP 952, 960, 964, 968, 972, 976, 980, 984, 988 January - December
SmartBuoy CT, FL, OBS, BD LB2_006, LB2_007, LB2_008, LB2_009, LB2_010, LB2_011, LB2_012, LB2_013/983, LB2_014/987 January - December

2005

Rig Type Typical Instruments Rig IDs Comment
Frame ADCP, CTD, OBS 923, 927, 931, 936, 940, 943, 947, 950 January - December
SmartBuoy CT, FL, OBS, WMS LB2_001/926, LB2_002/930, LB2_003/935, LB2_004/939, LB2_005/946 May - December
Marker buoy CT 922 April - May

CTD Sampling History

Year Number of Cruises Total Casts per year
2011 5 5
2010 6 6
2009 7 18
2008 9 16
2007 8 17
2006 9 18
2005 9 14
2004 8 8
2003 9 9
2002 2 2

The CTD instrument package for these cruises was a Sea-Bird 911plus, with beam transmissometer, fluorometer, LICOR PAR sensor, LISST-25, and oxygen sensor.

Key

ADCP = Acoustic Doppler Current Profiler
BD = Bacterial degradation experiment
CT = Conductivity and temperature logger
CTD = Conductivity, temperature, depth sensor
FL = Fluorometer
OBS = Optical Backscatter Turbidity meter
Telemetry ADCP = ADCP sending data back to shore in real-time
WMS = Automatic water sampler

Other Series linked to this Fixed Station for this cruise - 698867 698880 1195211 1195223 1195235 1195247 1622823

Other Cruises linked to this Fixed Station (with the number of series) - PD01/08 (12) PD01/11 (1) PD02/07 (4) PD02/09B (11) PD02/10 (1) PD04/06 (4) PD04/07 (4) PD06/07 (9) PD07/08 (9) PD07/11 (1) PD09/07 (9) PD09/08 (11) PD11/05 (3) PD11/11 (1) PD12/06 (4) PD12/09 (11) PD13/07 (11) PD14/08 (10) PD16/06 (4) PD16/07 (10) PD17/10 (5) PD18/05 (8) PD18/09 (10) PD19/08 (2) PD20/06 (4) PD20/07 (7) PD21/05 (8) PD21/10 (1) PD22/06 (4) PD23/07 (10) PD23/08 (7) PD24/09 (5) PD25/06 (4) PD27/07 (9) PD29/06 (4) PD29/08 (9) PD29/10 (1) PD30/05 (7) PD33/08 (1) PD33/09 (12) PD34/05 (2) PD35/06 (7) PD36/10 (1) PD37/06 (7) PD37/08 (11) PD38/09 (9) PD41/05 (6) PD43/11 (1) PD47/09 (11) PD48/05 (2) PD49/10 (1)


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