Metadata Report for BODC Series Reference Number 1623710


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 BB2391.00851
BODC Series Reference 1623710
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2002-08-07 12:55
End Time (yyyy-mm-dd hh:mm) 2002-09-25 11:45
Nominal Cycle Interval 600.0 seconds
 

Spatial Co-ordinates

Latitude 53.53283 N ( 53° 32.0' N )
Longitude 3.36733 W ( 3° 22.0' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor Depth 0.0 m
Maximum Sensor Depth 22.3 m
Minimum Sensor Height 2.7 m
Maximum Sensor Height 25.0 m
Sea Floor Depth 25.0 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)
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 PD20_02 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 is available below for each of the instruments deployed on rigs from this cruise.

Rig#851

Instrument Serial number Instrument depth Data quality comments
Aanderaa RCM fitted with a Sea-Tech transmissometer ST637 11817 Located on seabed The pressure data was found to be unrealistic and was replaced with data from an alongside instrument. Conductivity values became erratic after 2002-08-09 16:55:00 UTC and were replaced by absent data indicators by the Data Originator. There is a large offset in the conductivity data, however no corrections have been performed on this channel by the Data Originator. Temperature values were changed by -0.004°C after comparisons against CTD data and alongside instruments. These data should be used with caution.
Aanderaa BPR 0445 Located on seabed Temperature values were unrealistic from deployment until 2002-07-08 19:09:40 UTC. Values recorded over this period were set to absent data indicators by the Data Originator. A large offset was found by comparing the temperature channel with CTD data recorded during the deployment and recovery of the mooring. Comparisons performed against CTD data found that data from this sensor differed from CTD data by -0.095°C at deployment (CTD performed approximately 400 m from mooring) and -0.236°C at recovery (distance between CTD and mooring was approximately 590 m). Comparisons against the data from Aanderaa 11817 suggested an offset even greater than -0.236°C. The Originator did not attempt to perform any corrections to the data, and recommends that these data be used with caution.
Teledyne RDI 600 kHz ADCP 2391 Located on seabed
  • To correct for the magnetic declination (difference between magnetic north and true north) latitude values were changed by -4.4593°.
  • All latitude values were modified by +2.8201° to correct for the compass error.
  • Analysis of these data revealed that the midwater bins had been contaminated by interference from the recovery line attached to the ADCP lander frame. It was not possible to perform three beam correction because the long beam velocities were not recorded. Because of this the Data Originator recommends that these data are used with caution.
  • Rig#853


    Instrument Serial number Instrument depth Data quality comments
    Aanderaa RCM 10526 2 m There is a possible drift in the conductivity sensor during this deployment, however the Originator did not make any adjustments to the data. The Originator recommends that these data are used with caution.
    Aanderaa RCM 09631 5 m None.
    Aanderaa RCM 09959 10 m Quality checks revealed a large disparity between these data and the data recorded by the CTD during mooring deployment and recovery, however the Originator did not make any adjustments to the data as there was no consistent offset which could be used to adjust the data. The Originator recommends that these data are used with caution.

    Quality report for Liverpool Bay Coastal Observatory ADCP data

    The data originator noticed visible contamination of the mid-water bins in these series, and recommends that these data are used with caution.

    There was significant contamination of the mid-water bins caused by interference from the recovery line attached to the ADCP lander frame. This issue was corrected in the majority of the ADCP data series using the three-beam correction method outlined in the following ADCP correction report, however the data originator was not able to perform this correction for the first few ADCP deployments. In these series the 'earth' velocities were automatically derived, meaning the individual along beam velocities required for the correction were not available, and thus no three-beam correction was performed.


    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. 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 -
    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.

    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) 2002-08-07
    End Date (yyyy-mm-dd) 2002-09-25
    Organization Undertaking ActivityProudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool)
    Country of OrganizationUnited Kingdom
    Originator's Data Activity IdentifierPOLRIG#851
    Platform Categorysubsurface mooring

    Proudman Oceanographic Laboratory Rig#851

    This rig was deployed as part of the Liverpool Bay Coastal Observatory during R.V. Prince Madog cruise PD020_02.

    Rig Position 53.5328° N, 3.3673° W
    Water Depth 25m
    Deployed 07 August 2002 12:55
    Recovered 25 September 2002 12:15

    The instruments were mounted on POL frame D1, which was deployed onto the sea floor. The frame was fitted with two Benthos releases (1B and 7A) and a spooler for recovery of the ballast weight.

    Recovery of the rig took place during R.V. Prince Madog cruise PD024_02. The acoustic releases were fired but the frame did not surface as expected. Sweeping for the rig was commenced, using a loop of wire the width of the stern. After several attempts, the frame and ballast weight were snagged and recovered. Inspection showed that both releases had fired but the frame had not surfaced because the spooler had jammed.

    It was noted that the frame was completely covered by a "hairy" algal growth.

    Instrument Meter Height Parameters Measured
    ADCP 2391 0.5m Velocity profile
    Transmissometer ST637 0.5m Temperature, conductivity, pressure, beam attenuation
    Pressure recorder 445 0.5m Temperature, pressure

    Other Series linked to this Data Activity - 636790 593235 592951

    Cruise

    Cruise Name PD20/02
    Departure Date 2002-08-07
    Arrival Date 2002-08-08
    Principal Scientist(s)M John Howarth (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 - 592914 592926 592938 592951 593235 636790

    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) PD20/06 (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) PD37/06 (14) 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