Metadata Report for BODC Series Reference Number 592938


Metadata Summary

Data Description

Data Category Hydrography time series at depth
Instrument Type
NameCategories
Aanderaa RCM 7/8 Recording Current Meter  current meters
Instrument Mounting subsurface mooring
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 AS10526.00853
BODC Series Reference 592938
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2002-08-07 12:14
End Time (yyyy-mm-dd hh:mm) 2002-09-25 15:54
Nominal Cycle Interval 600.0 seconds
 

Spatial Co-ordinates

Latitude 53.53280 N ( 53° 32.0' N )
Longitude 3.36980 W ( 3° 22.2' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor Depth 2.0 m
Maximum Sensor Depth 2.0 m
Minimum Sensor Height 24.0 m
Maximum Sensor Height 24.0 m
Sea Floor Depth 26.0 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 Sea floor reference - Depth measured as a height above sea floor but converted into a depth relative to the sea surface according to the same datum as used for sea floor depth (applicable to instrument depths not bathymetric depths)
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
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
 

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.

    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

    Aanderaa Recording Current Meter Model 7/8

    Manufacturer's specifications: recording unit height 49.5cm (RCM8 52.0cm), diameter 12.8cm, vane size 48.5x50.0cm. Meter is designed for depths down to 2000m (RCM8 6000m). It incorporates a spindle which is shackled to the mooring line. The meter is attached to the spindle through a gimbal mounting which permits a maximum 27° deviation of the spindle from the vertical, the meter still remaining horizontal.

    Meter comprises :

    1. Paddle wheel rotor magnetically coupled to an electronic counter

    2. Vane, which aligns instrument with current flow, has a balance weight ensuring static balance and tail fins to ensure dynamic balance in flows up to 250cm/s.

    3. Magnetic compass (needle is clamped to potentiometer ring) - direction recorded with 0.35° resolution, 5° accuracy for speeds 5 to 100cm/s, 7.5° accuracy for remaining speeds within 2.5 to 200cm/s range.

    4. Quartz clock, accuracy better than 2 sec/day within temperature range 0 to 20°C.

    5. Thermistor (temperature sensor), standard range -2.46 to 21.48°C (max on high range 36.04°C), accuracy 0.05°C, resolution 0.1 per cent of range, 63 per cent response time 12sec.

    6. Inductive cell conductivity sensor (optional), range 0 to 70mmho/cm standard resolution 0.1 per cent of range.

    7. Silicon piezoresistive bridge, standard range 0 to 3000 psi (RCM8 to 9000 psi), resolution 0.1% of range.

    8. Self balancing potentiometer which converts the output from each sensor into a 10 bit binary number for storage on magnetic tape.

    9. Associated electronics.

    A built-in clock triggers the instrument at preset intervals and up to six channels are sampled in sequence. Channel 1 is a fixed reference reading for control purposes and data identification. Channels 2, 3 and 4 represent measurement of temperature, conductivity and pressure. Channels 5 and 6 represent the VECTOR AVERAGED current speed and direction since the previous triggering of the instrument. The number of rotor revolutions and the direction is sampled every 12 seconds and broken into North and East components. Successive components are added and recorded as speed and direction. For recording intervals longer than 10 minutes, speed and direction are sampled 1/50th of recording interval.

    It has become common practice in some laboratories to deploy these meters as temperature and conductivity loggers without current measuring capabilities.

    The following link will provide the manufacturer specifications:

    Manufacturer specifications

    Aanderaa Current Meter Data Processing

    Data Originator's Processing

    The following procedures are carried out before the data were supplied to BODC.

    After the mooring was recovered, the data were downloaded from the instrument logger, and factory calibrations were applied to the temperature and conductivity channels. Where available, laboratory calibrations of the current direction channels were used; factory formulae were used in their absence. Where no form factor was known for the conductivity sensor, a value of 2.8 was used.

    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 their 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.

    Processing of Coastal Observatory Aanderaa RCM 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. During this process, salinity was derived from the conductivity and temperature data, in accordance with the methods outlined in Foffonoff and Millard (1982). As no pressure channel was present, the pressure used in the derivation comprised a single nominal value calculated from the instrument depth provided in the header of the data file.

    The table below shows how the variables within the processed data files were mapped to appropriate BODC parameter codes.

    Originator's variable Units Description BODC parameter code Units Comments
    Date/Time yyyy mm dd hh mm ss - - - This variable was not transferred. BODC re-calculate date and time during the transfer process
    Temperature Deg(C) Temperature of the water body TEMPPR01 °C -
    Conductivity S m -1 Electrical conductivity of the water body by in-situ conductivity cell CNDCPR01 S m -1 -
    - - Practical salinity of the water body by conductivity cell and computation using UNESCO 1983 algorithm PSALPR01 Dimensionless This variable was derived by BODC following Fofonoff and Millard (1983).

    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. Any channels which comprised entirely of absent data indicators were excluded from the final qxf.

    References

    Fofonoff, NP and Millard, RC. 1983. Algorithms for computations of fundamental properties of seawater. UNESCO Technical Papers in Marine Science, 44, p.53.

    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) 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#853
    Platform Categorysubsurface mooring

    Proudman Oceanographic Laboratory Rig#853

    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, 3.3698° W
    Water Depth 26m
    Deployed 07 August 2002 12:15
    Recovered 25 September 2002 15:55

    The mooring was composed of 0.5 inch long link chain, marked by a 1.8m toroid and anchored by a 0.5 tonne clump of scrap chain.

    Recovery of the rig was straightforward and took place during R.V. Prince Madog cruise PD024_02. It was noted that the logger closest to the surface was covered in brown slime.

    Instrument Meter Height Above Bed Parameters Measured
    Current meter 9959 16m Temperature, conductivity
    Current meter 9631 21m Temperature, conductivity
    Current meter 10526 24m Temperature, conductivity

    Other Series linked to this Data Activity - 592926 592914

    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 592951 593235 636790 1623710

    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