Metadata Report for BODC Series Reference Number 1623408

Metadata Summary

Data Description
Data Category Currents -subsurface Eulerian
Instrument Type
NameCategories
Teledyne RDI Workhorse Sentinel-600 ADCP  current profilers
Instrument Mounting subsurface mooring
Originating Country United Kingdom
Originator Dr Matt Palmer
Originating Organization Proudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool)
Processing Status banked
Project(s) Coastal Observatory
 

Data Identifiers

Originator's Identifier BB5806.00986
BODC Series Reference 1623408
 

Time Co-ordinates(UT)
Start Time (yyyy-mm-dd hh:mm) 2006-12-15 09:10
End Time (yyyy-mm-dd hh:mm) 2007-02-14 12:09
Nominal Cycle Interval 600.0 seconds
 

Spatial Co-ordinates

Latitude 53.53400 N ( 53° 32.0' N )
Longitude 3.35783 W ( 3° 21.5' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor Depth 1.0 m
Maximum Sensor Depth 22.0 m
Minimum Sensor Height 2.7 m
Maximum Sensor Height 23.7 m
Sea Floor Depth 24.7 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)
ASLVMWHA 1 Metres SL_MWH_ADCP Surface elevation (Mean Water Height) of the water body by acoustic doppler current profiler (ADCP)
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)
LERRAP01 2 Centimetres per second ADCPER Current velocity error 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

Originator's quality control comments for PD37_06 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#985

Instrument Serial number Instrument depth Data quality comments
Sea-Bird MicroCAT 02991 5 m The temperature data from this instrument are of good quality. Comparison checks performed against CTD data found a consistent offset of -0.0039 S m-1 in the conductivity channel (distance between CTD and mooring of less than 400 m at deployment and less than 300 m at recovery). An offset correction of +0.0039 S m-1 has been applied to these data.
Sea-Bird MicroCAT 04998 10 m None.

Rig#986


Instrument Serial number Instrument depth Data quality comments
Sea-Bird 16+ SEACAT fitted with Seapoint Turbidity Meter #10471 04597 Located on seabed The conductivity data became unrealistic after 2007-01-17 12:00:03 UTC and has been converted to absent data values. Comparisons performed against the data recorded by the two MicroCATs present at this site found an offset of -0.04 in salinity and -0.01°C in temperature. Offset corrections of +0.04 in salinity and +0.01°C in temperature have been applied to 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 -3.754°. All latitude values were modified by +0.64521° to correct for the compass error.

Rig#988


Instrument Serial number Instrument depth Data quality comments
Sea-Bird 16+ SEACAT fitted with Seapoint Turbidity Meter #10489 04737 Located on seabed There was only one CTD available close to deployment, and none available at recovery to perform the CTD comparison checks, meaning it was not possible for the originator to determine whether an offset was affecting these data. For this reason the Data Originator recommends that these data are used with caution.
Teledyne RDI 600 kHz ADCP 5807 Located on seabed To correct for the magnetic declination (difference between magnetic north and true north) latitude values were changed by -3.866°. All latitude values were modified by +2.7419° 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

Teledyne RDI Workhorse Sentinel 600 kHz Acoustic Doppler Current Profiler (ADCP)

The Workhorse Sentinel is a self-contained ADCP that can be used either on a mooring or mounted in the hull of a moving vessel. Its 4-beam design provides a redundant data source (in case of a blocked or damaged beam), an independent data quality measure (error velocity) and reduces the variance in data, thereby improving data reliability, quality and accuracy.

Real-time data can be transmitted to shore via a cable link or acoustic modem or they can be stored internally. Sensors for bottom tracking, pressure and directional wave measurements can be added to the instrument and a special casing is available for deeper applications.

Specifications

Typical range 50 m
Number of depth cells 1 to 128
Typical ping rate 2 Hz
Standard depth rating 200 to 6000 m
Beam angle 20 °
Echo intensity profile
Dynamic range 80 dB
Precision ± 1.5 dB
Velocity
Accuracy 0.3% of the water velocity relative to the ADCP ± 0.3 cm s -1
Resolution 0.1 cm s -1
Range

± 5 m s -1 (default)

± 20 m s -1 (maximum)

Vertical resolution Range / Std Dev
for 0.5 m 39 m / 12.9 cm s -1
for 1 m 43 m / 6.1 cm s -1
for 2 m 47 m / 3.0 cm s -1
for 4 m 52 m / 2.0 cm s -1
Long Range mode
Range 70 m
Depth cell size 4 m
Std Deviation 4.2 cm s -1
Temperature
Operating temp. -5 to 45 °C
Precision ± 0.4 °C
Resolution 0.01 °C
Tilt
Range ± 15 °
Accuracy ± 0.5 °
Precision ± 0.5 °
Resolution 0.01 °
Compass
Accuracy ± 2 °
Resolution 0.01 °
Maximum tilt ± 15 °
Precision ± 0.5 °

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

BODC Processing document for Coastal Observatory moored ADCP data

The data arrived at BODC as 117 ASCII format .dat files representing moored ADCP data recorded at the Coastal Observatory sites 1(9), 20 and 21 between 07 August 2002 and 20 September 2011. Following standard BODC procedure the files were reformatted into BODC standard internal format using an internal transfer function. This included removing surface null bins.

The following table shows how the originator's variables were mapped to the appropriate BODC parameter codes:

Originator's variable Units Description BODC parameter code Units Comments
Sea surface height m Surface elevation (Mean Water Height) of the water body by acoustic doppler current profiler (ADCP) ASLVMWHA Metres -
East cm/s Eastward current velocity (Eulerian) in the water body by moored acoustic doppler current profiler (ADCP) LCEWAP01 cm s -1 -
North cm/s Northward current velocity (Eulerian) in the water body by moored acoustic doppler current profiler (ADCP) LCNSAP01 cm s -1 -
Vertical cm/s Upward current velocity in the water body by moored acoustic doppler current profiler (ADCP) LRZAAP01 cm s -1 -
Error cm/s Current velocity error in the water body by moored acoustic doppler current profiler (ADCP) LERRAP01 cm s -1 -
3beam_matrix None - - - Boolean value stating whether the data originator had performed the three beam correction on a particular bin. Values indicating that the three beam correction had been performed were converted into an originator's flag ('L') when the data were transferred into qxf format.
Height from sea bed m Height above bed (ADCP bin) in the water body HBINAA01 Metres -

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.

COBS RDI Teledyne 600 kHz ADCP Data Processing

Sampling Strategy

Two mooring sites were maintained for the duration of the Liverpool Bay Coastal Observatory project. Moored instruments present at Site A (also known as Site 1/9) through the entire data collection phase of the observatory. From 05 April 2005 (Cruise PD11_05) moorings were also present at an additional Site B. From April 2005 until December 2009 mooring Site B was located at Coastal Observatory Station 20. The moorings were moved to Station 21 from January 2010, where they remained until the end of the observatory.

Originator's Processing

The raw ADCP data were processed using the standard RDI software bblist which resulted in the creation of two files, the first containing the current velocities separated by bin depth and an auxiliary file containing the variables heading, pitch, roll, temperature and pressure. The variables present in the auxiliary files were only used for quality control purposes with the exception of pressure, which was used to calculate sea surface height taking into account the latitude and the height of the transducer head above the seabed, which was estimated to be 0.7 m. Sea surface height and the current velocity data were then combined into one file.

Before the data were supplied to BODC, some quality control procedures were performed by the Data Originator. First the Originator corrected the latitude values to take into account the difference between magnetic north and true north (magnetic declination). The Originator also corrected the latitude values for compass error caused by localised magnetic fields such as the ADCP frame and battery, using HF radar data recorded by two HF radars located at Abergele and Formby as a reference. Once compass errors for all ADCP series recorded at Site A had been calculated, a mean of all errors was taken. As the ADCP compass error is a random error, the expected mean of all errors is approximately 0°, however the Originator found that the actual mean compass error was approximately 5.3°. All compass errors were therefore modified by 5.3°. The compass error values given in the Originator's data processing documents have taken this adjustment into account.

The bins recorded above the sea surface were then converted to absent data indicators by the Data Originator. If there were any problems with the pressure data recorded by the ADCP, then data from another instrument attached to the same frame was used instead. If no pressure records were available, then backscatter intensity was used to calculate the sea surface. The top three bins have been removed in all series to remove noise in these data caused by side lobe contamination. A more detailed explanation of all of the quality control procedures performed before the data were submitted to BODC can be found in the Originator's ADCP quality control methodology document.

Analysis of the Coastal Observatory ADCP data found that some of the midwater beams had been contaminated, with the Originator suspecting that the cause was the contamination of individual acoustic beams by the recovery line attached to the ADCP lander frame. As the contamination only affected individual acoustic beams, it was possible to estimate the horizontal component of the contaminated beam using the vertical components of the two perpendicular beams and the unaffected horizontal component. A full description of how this procedure was carried out can be found in the Originator's ADCP correction report

Finally a visual inspection of the data was carried out to find any obvious errors which had not been corrected by the previous quality control checks.

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) 2006-12-15
End Date (yyyy-mm-dd) 2007-02-14
Organization Undertaking ActivityProudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool)
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierPOLRIG986
Platform Categorysubsurface mooring

Proudman Oceanographic Laboratory Rig#986

Deployment and Recovery

This rig was deployed as part of the Liverpool Bay Coastal Observatory during R.V. Prince Madog cruise PD37_06. All of the major moorings objectives were accomplished during this cruise. Recovery of the rig took place during R.V. Prince Madog cruise PD02_07.

Rig Position 53° 32.040'N 3° 21.4698'W
Water Depth 24.7 m
Deployed (UT) 2006-12-15 09:09 UTC
Recovered (UT) 2007-02-14 12:09 UTC
No. of days 61

Rig Description

This rig was a bottom frame comprising of the following instruments 0.5 m above the seabed; Waves Acoustic Doppler Current Profiler (ADCP), a SonTek ADV Logger and a SeaBird 16plus. The frame was fitted with two Benthos releases s/n 71922 (Rx 11.5 kHz, Tx 12.0 kHz, release A) and s/n 72858 (Rx 14.5 kHz, Tx 12.0 kHz, release A) both fitted with a fizz link and a spooler with 150m of rope for recovery of the ballast weight.


Instrument Serial Number Parameters Measured Sampling Description Comments
RDI 600 kHz Waves ADCP 5806 Horizontal current velocity components
Vertical current velocity components
Temperature
Pressure		 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.
Beam co-ordinates - speeds, correlation, echo intensity, % good.
Fitted with a pressure sensor and 1 Gbyte PCMCIA memory; hourly wave recording enabled. Clock set at 15:25:15 UTC 2006-12-12; delayed start 08:00:00 UTC 2006-12-13.
Sea-Bird 16plus
V RS-485 1.0		 4597 Temperature
Conductivity
Pressure
Turbidity		 Sample interval 600 s; digiquartz integration time 40 s, range 400; pump 0.5 s, 1 s delay. Fitted to base of frame with pumped conductivity sensor underneath.
SeaPoint turbidity sensor 10471 taped to roll bar; set up for 0 - 125 FTU range.
Clock set at 14:25:10 UTC 2006-12-12; delayed start at 08:00:00 UTC 2006-12-13.
SonTek ADV (Acoustic Doppler Velocimeter) ADV Logger G250; sensor B252H. Current velocity and direction at a small sampling volume at a fixed (10cm) distance from probe using 3D Doppler techniques. Sample rate 16 Hz; burst interval 3600 s; Changed compass orientation to up. Clock set at 15:55:00 UTC on 2006-12-12; Delayed start at 08:00:00 UTC on 2007-12-13.

Other Series linked to this Data Activity - 753118

Cruise

Cruise Name PD37/06
Departure Date 2006-12-14
Arrival Date 2006-12-15
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 NameCOA
CategoryOffshore area
Latitude53° 31.51' N
Longitude3° 23.00' W
Water depth below MSL26.0 m

Liverpool Bay Coastal Observatory Mooring Site A (COA/Site 1/Site 9)

This station is the main mooring site for the Proudman Oceanographic Laboratory (POL) Liverpool Bay Coastal Observatory and was first occupied in 2002. It is also known both as Coastal Observatory Site 1 and Site 9. POL perform two main types of activities at this station: they deploy moorings; and in addition, they take CTD profiles during each site visit. The station lies within a box of mean water depth 22.5 m with the following coordinates:

Box Corner Latitude (+ve North) Longitude (+ve East)
North-west corner 53.54097 -3.42958
South-east corner 53.50945 -3.33714

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

2011

Rig Type Typical Instruments Rig IDs Comment
Frame ADCP, CTD, OBS, OXY 1117, 1121, 1125, 1127, 1130, 1132, January - November
SmartBuoy CTD x 2, AC-S, CT x 2, FL x 3, OBS x 2, PAR x 2, WMS, NAS, OXY, T x 2 1116, 1120, 1124 January - November

2010

Rig Type Typical Instruments Rig IDs Comment
Frame ADCP, CTD, ADV, OBS 1086, 1090, 1094, 1098, 1102, 1106, 1109 January - December
SmartBuoy CT x 2, FL x 2, OBS, PAR x 2, WMS, NAS, CTD, OXY, BD, T 1085, 1089, 1093, 1097, 1101, 1105, 1108, 1112 January - December

2009

Rig Type Typical Instruments Rig IDs Comment
Frame ADCP, CTD, ADV, OBS 1055, 1062, 1067, 1071, 1074, 1078, 1082 January - December
SmartBuoy CT x 2, FL x 2, OBS, PAR x 2, WMS, NAS, CTD, OXY, BD, T 1054, 1061, 1066, 1070, 1073, 1077, 1081 January - December

2008

Rig Type Typical Instruments Rig IDs Comment
Frame ADCP, CTD, ADV, OBS 1024, 1028, 1032, 1036, 1041, 1044, 1047, 1051 January - December
SmartBuoy CT x 2, FL x 2, OBS, PAR x 2, WMS, NAS, CTD, OXY, BD, T LB1_047/1023, LB1_048/1027, LB1_049/1031, LB1_050/1035, 1040, 1043, LB1_053/1050 January - December

2007

Rig Type Typical Instruments Rig IDs Comment
Frame ADCP, CTD, ADV, OBS 990, 997, 1001, 1005, 1010, 1014, 1017, 1021 January - December
SmartBuoy CT x 2, FL x 2, OBS, PAR x 2, WMS, NAS, CTD, OXY, BD, T LB1_039/989, LB1_040/996, LB1_041/1000, LB1_042/1004, LB1_043/1009, LB1_044/1013, LB1_045/1016, LB1_046/1020 January - December

2006

Rig Type Typical Instruments Rig IDs Comment
Frame ADCP, CTD, ADV, OBS 951, 962, 966, 970, 974, 978, 982, 986 January - December
SmartBuoy CT x 2, FL x 2, OBS, PAR x 2, WMS, NAS, CTD, OXY, BD 958, 961, 965, 969, 973, 977, LB1_037/981, LB1_038/985 January - December

2005

Rig Type Typical Instruments Rig IDs Comment
Frame ADCP, CT 913, 914, 921, 925, 929, 933, 938, 942, 945, 949 January - December
SmartBuoy CT, FL, OBS, PAR, WMS, NAS, OXY 912, 920, 924, 928, 932, 937, LB1_028/941, LB1_029/944, LB1_030/948 January - December
Frame with telemetry buoy ADCP 914 March - April

2004

Rig Type Typical Instruments Rig IDs Comment
Frame BPR, ADCP, TR, CT 890, 892, 893, 896, 898, 900, 902, 904, 907, 908, 910, 911 January - December
SmartBuoy CT, FL, OBS, PAR, WMS, NAS 889, 891, 895, 897, 899, 901, 903, 906, 909 January - December
Frame with telemetry buoy ADCP 893, 908, 911 April - May, October - December

2003

Rig Type Instruments Rig IDs Comment
Frame BPR, ADCP, TR, CT 861, 864, 866, 869, 872, 878, 880, 883, 885, 887, 888 January - December
SmartBuoy CT, FL, OBS, PAR, WMS, NAS 863, 865, 867, 870, 871, 877, 879, 882, 884, 886 January - December

2002

Rig Type Instruments Rig IDs Comment
Frame BPR, ADCP, TR, CT 851, 854, 856, 858 August - December
Line mooring CT x 3 853, 855 August - November
SmartBuoy CT, FL, OBS, PAR, WMS, NAS 857, 860 November - December

2001

Rig Type Instruments Rig IDs Comment
Frame ADCP, OBS 838, 839, 840, 841, 843, 844, 845, 846, 848, 849 September

CTD Sampling History

Year Number of Cruises Total Casts per year
2011 6 116 including a 46 cast tidal cycle from 2011-04-18 to 2011-04-19 and a 51 cast tidal cycle station from 2011-07-27 to 2011-07-28
2010 8 71 including a 52 cast tidal cycle station from 2010-04-28 to 2010-04-29
2009 7 21
2008 9 75 including a 54 cast tidal cycle station from 2008-05-13 to 2008-05-14
2007 8 71 including a 51 cast tidal cycle station from 2007-05-15 to 2007-05-16
2006 9 72 including a 53 cast tidal cycle station from 2006-05-09 to 2006-05-10
2005 9 41 including a 22 cast tidal cycle station from 2005-04-05 to 2005-04-06
2004 9 77 including a 54 cast tidal cycle station from 2004-05-11 to 2004-05-12
2003 10 28
2002 4 13

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

AC-S = Absorption and attenuation spectrophotometer
ADCP = Acoustic Doppler Current Profiler
ADV = Acoustic Doppler Velocimeter
BD = Bacterial degradation experiment
BPR = Bottom Pressure Recorder
CT = Conductivity and temperature logger
CTD = Conductivity, temperature, depth sensor
FL = Fluorometer
NAS = in-situ nutrient analyser
OBS = Optical Backscatter Turbidity meter
OXY = Oxygen sensor
PAR = PAR sensor
T = Temperature logger
TR = Transmissometer
WMS = Automatic water sampler

Other Series linked to this Fixed Station for this cruise - 747057 747162 747266 747334 747395 747451 747499 747506 752951 753026 753118 1003634 1003646

Other Cruises linked to this Fixed Station (with the number of series) - CO 01/12 (5) PD01/08 (17) PD01/11 (14) PD02/03 (10) PD02/05 (11) PD02/07 (15) PD02/09B (17) PD02/10 (15) PD04/06 (1) PD05/10 (16) PD06/04 (12) PD06/07 (16) PD07/08 (14) PD07/11 (17) PD09/06 (11) PD09/07 (64) PD09/08 (16) PD10/03 (9) PD10/10 (14) PD11/04B (13) PD11/05 (9) PD11/11 (57) PD12/05 (2) PD12/09 (16) PD13/07 (14) PD14/08 (67) PD16/06 (9) PD16/07 (15) PD17/03 (12) PD17/10 (15) PD18/04 (13) PD18/05 (11) PD18/09 (17) PD19/08 (2) PD20/02 (7) PD20/06 (9) PD20/07 (17) PD21/05 (10) PD21/10 (15) PD21/11 (9) PD22/04 (13) PD22/06 (9) PD23/03A (10) PD23/07 (15) PD23/08 (13) PD24/02 (2) PD24/09 (17) PD25/03B (12) PD25/05 (11) PD25/06 (9) PD25/11 (7) PD27/07 (17) PD29/04 (12) PD29/06 (9) PD29/08 (14) PD29/10 (17) PD30/05 (10) PD31/02 (11) PD31/03 (12) PD32/04 (12) PD33/08 (5) PD33/09 (16) PD34/03 (12) PD34/05 (10) PD35/02 (11) PD35/06 (14) PD36/10 (16) PD37/08 (18) PD38/03 (13) PD38/04 (12) PD38/09 (16) PD41/05 (11) PD43/11 (11) PD44/03 (7) PD47/09 (15) PD48/03 (5) PD48/04 (8) PD48/05 (10) PD49/10 (14) PD52/04 (8)

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
Q value below limit of quantification