Metadata Report for BODC Series Reference Number 1194220


Metadata Summary

Data Description

Data Category Water column chemistry
Instrument Type
NameCategories
EnviroTech LLC NAS-3X Nutrient Analyser  nutrient analysers
Instrument Mounting moored surface buoy
Originating Country United Kingdom
Originator Mr Tom Hull
Originating Organization Centre for Environment, Fisheries and Aquaculture Science Lowestoft Laboratory
Processing Status banked
Project(s) Coastal Observatory
 

Data Identifiers

Originator's Identifier LB1_016_NA_2316
BODC Series Reference 1194220
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2004-06-09 16:00
End Time (yyyy-mm-dd hh:mm) 2004-07-20 12:00
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 53.53420 N ( 53° 32.1' N )
Longitude 3.36170 W ( 3° 21.7' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor Depth 1.0 m
Maximum Sensor Depth 1.0 m
Minimum Sensor Height 23.0 m
Maximum Sensor Height 23.0 m
Sea Floor Depth 24.0 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 Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum Approximate - Depth is only approximate
 

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
NTRZNS01 1 Micromoles per litre NO3+NO2_Unfilt_Colin-Situ Concentration of nitrate+nitrite {NO3+NO2} per unit volume of the water body [dissolved plus reactive particulate phase] by in-situ nutrient analysis system
 

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

Smartbuoy quality report - Total Oxidised Nitrogen

Originator's Quality report

Originator's identifier BODC identifier Summary of originator's flags applied
2 3 9 11 12
LB1_001_NA_2316 1193228 Y Y      
LB1_005_NA_2316 1193449 Y        
LB1_007_NA_2316 1193566 Y        
LB1_008_NA_2435 1193646 Y        
LB1_009_NA_2316 1193726 Y Y      
LB1_010_NA_2435 1193806         Y
LB1_014_NA_1819 1194072         Y
LB1_015_NA_2435 1194140 Y Y      
LB1_016_NA_2316 1194220 Y        
LB1_017_NA_1777 1194300 Y Y      
LB1_018_NA_2273 1194385         Y
LB1_020_NA_2435 1194545   Y Y    
LB1_021_NA_2357 1194613     Y    
LB1_022_NA_2435 1194686         Y
LB1_023_NA_2313 1194754       Y  
LB1_024_NA_2435 1194846 Y        
LB1_025_NA_2405 1194926 Y        
LB1_026_NA_2357 1194999 Y        
LB1_027_NA_2623 1195075 Y       Y

The originator's files including flags applied have been archived by BODC and are available on request.

Originator's flag 2

Flag 2 is used by CEFAS for data that have failed the QA process because the data are below the accepted minimum for the parameter. As a result the cycles flagged in this way have been assigned BODC flag L (improbable value - originator's quality control).

Originator's flag 3

Flag 3 is used by CEFAS for data that have failed the QA process because the data are above the accepted maximum for the parameter. As a result the cycles flagged in this way have been assigned BODC flag L (improbable value - originator's quality control).

Originator's flag 9

Flag 9 is used by CEFAS for data that have failed the QA process because the data are deemed to be suspicious (unknown cause). As a result the cycles flagged in this way have been assigned BODC flag L (improbable value - originator's quality control).

Originator's flag 11

Flag 11 is used by CEFAS for data that have failed the QA process because the sensor platform was out of position. As a result the cycles flagged in this way have been assigned BODC flag L (improbable value - originator's quality control).

Originator's flag 12

Flag 12 is used by CEFAS for data that have failed the QA process because of a suspected sensor malfunction. As a result the cycles flagged in this way have been assigned BODC flag L (improbable value - originator's quality control).

BODC's Quality report

Originator's identifier BODC identifier Comments
LB1_014_NA_1819 1194072 BODC has flagged some values as null (BODC flag N) as some of the data supplied by the originator with originator's flag 12 were < -1 µmol/ l or > 10,000 µmol/l.
LB1_015_NA_2435 1194140 BODC has flagged some negative concentrations as suspect (BODC flag M). For one value where the concentration was < -1 µmol/ l the cycle has been made null (BODC flag N).
LB1_022_NA_2435 1194686 BODC has flagged some concentrations of > 1000 µmol/ l supplied with originator's flag 12 as null (BODC flag N)
LB1_024_NA_2435 1194846 The originator has applied flag 12 (below minimum for parameter) for the whole series. This flag has only previously been used for values below ~ 0.4 µmol/ l in similar series from the same instrument type.

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

EnviroTech NAS-2E and NAS-3X In Situ Nutrient Analyser

The NAS-3X is an upgraded version of the NAS-2E. They are in-situ nutrient analyzers for high-frequency time-series determination of nutrient concentrations in marine and fresh waters. Versions are available for the measurement of nitrate phosphate, silicate and ammonia.

The new "3X" version incorporates a new electronic controller and datalogger with a scriptable control language. Other features include new detector electronics for higher precision measurements, larger memory, easy interfacing and new analysis sequences.

The NAS-3X is typically deployed unattended for periods of 1 - 3 months although, according to the manufacturers, longer deployments have been achieved. The device may be used near surface, in buoy and riverine applications, or be deployed at depths to 250 m in taut-line moorings.

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

CEFAS SmartBuoy Parameter Mapping 2002-2005

Orginators parameters have been mapped to BODC parameters in the following way:

Originators parameter Originators units BODC parameter BODC units Conversion Comments
Conductivity mmho cm -1 CNDCPR01 S m -1 /10  
Temperature Degrees Celsius TEMPPR01 Degree Celsius None  
Salinity   PSCLCCI1   None Data calibrated with field samples
Fluorescence SP (arbitary values) FVLTTDZX Dimensionless None  
Chlorophyll concentration µg l -1 CPHLPS01 mg m -3 None mg m -3 = µg l -1
Turbidity FTU TURBPR01 NTU None FTU = NTU
Suspended load mg l -1 TSEDBSCL mg l -1 None  
Total oxidised nitrogen µmol l -1 NTRZNS01 µmol l -1 None  
PAR irradiance µE m -2 s -1 IRRDUV01 µE m -2 s -1 None PAR sensor deployed in water column
Silicate µmol l -1 SLCAAATX µmol l -1 None  
Total oxidised nitrogen µmol l -1 NTRZAATX µmol l -1 None  
Suspended load mg l -1 TSEDGVP2 mg l -1 None Measure by filtration and gravimetry and calibration against sample data

Please note that this document includes details of all of the parameters supplied by CEFAS at the time of submission, each series may contain only a subset of these parameter.

Cefas SmartBuoy data processing

This document outlines the procedures in place at Cefas in August 2005 for processing and quality assuring SmartBuoy data.

Raw data files are processed and the data move through 4 levels, starting with raw data at level 0 through to level 3, where data are fully quality-assured and expressed in appropriate units. The application of the procedures at each level result in data deemed fit to progress to the next level.

Cefas Quality Assurance (QA) Protocols

At Level 0, raw binary data files from the loggers are transferred to the network.

Automated checks - Level 1

Level 1 involves applying automated quality assurance procedures to the data. These include the following steps:

The data are now at QA status = 1.

Manual checks - Level 2

Level 1 burst mean data are now ready for manual QA procedures in order to progress to Level 2. Deployment notes are consulted for any comments on sensor performance or malfunction and post-deployment photographs of sensors, if available, are examined.

Cefas use a data visualisation tool to examine the SmartBuoy data.

Calibrations - Level 3

The combined information from Level 2 is used to determine the periods during which the data series are considered suspect. The data have now reached QA status = 2 and can progress to Level 3, where they will be fully calibrated with field-derived sample data.

The data have now reached QA status = 3 as time stamped, field calibrated burst mean data with parameter codes and units stored on SmartBuoy database with associated uncertainty or 95% confidence limits as appropriate. All SmartBuoy data banked at BODC have passed full Cefas QA procedures. Data that fail the Cefas QA checks are not submitted for banking.

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.

SmartBuoy data processing by BODC

The following outlines the procedures that take place at BODC for banking Cefas SmartBuoy data.

BODC receives SmartBuoy data from Cefas after all quality checks have been passed and all possible calibrations applied. The data files are submitted as separate MS Excel spreadsheets for each parameter, i.e. there are separate files for temperature and salinity from the same instrument. An exact copy of the data is archived for safekeeping upon arrival.

Once the submitted data files are safely archived, the data undergo standard reformatting and banking procedures:


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) 2004-06-09
End Date (yyyy-mm-dd) 2004-07-20
Organization Undertaking ActivityProudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool)
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierLB1_016/POLRIG897
Platform Categorymoored surface buoy

SmartBuoy deployment LB1_016/897

Deployment and recovery

This mooring was deployed in a collaboration between Cefas and the POL Liverpool Bay Coastal Observatory.

Deployment cruise RV Prince Madog cruise PD22/04
Recovery cruise RV Prince Madog cruise PD29/04
Rig position 53° 32.025' N, 3° 21.74' W

Rig Description

The Cefas SmartBuoy carried a suite of instruments mounted just below the surface, as well as instrumentation belonging to POL at 5 and 10 metres below the surface. Further information about the instrument suite is given in the table below.

The single point mooring was composed mainly of 0.5 inch long link chain, marked by a 1.8 m diameter toroid and anchored with a half tonne clump of scrap chain.

Instrument Serial
Number
Meter
depth (m)
Record
Length (days)
Comment Owner
Seapoint Chlorophyll Fluorometer 2211 1 26 - Cefas
Chelsea Instruments MINItracka Fluorometer 175064 1 19 - Cefas
Falmouth Scientific OEM CT sensor 1408 1 41 - Cefas
Seapoint Turbidity meter 1433 1 41 - Cefas
LI-COR-192 Underwater Quantum sensor 20 1 25 - Cefas
LI-COR-192 Underwater Quantum sensor 8 2 26 - Cefas
EnviroTech NAS 2E in-situ nutrient analyser 2316 1 32 - Cefas
EnviroTech WMS-1 AquaMonitor water sampler 2384 1 39 - Cefas
EnviroTech WMS-2 AquaMonitor water sampler 2327 1 unknown - Cefas
Sea-Bird MicroCAT IM 37 2010 5 31 - POL
Aanderaa RCM 7 (No fin: deployed as TC logger only) 9631 10 41 - POL

Other Series linked to this Data Activity - 664281 1194219 664268 1194256 1194188 1194232 1194207 1194244

Cruise

Cruise Name PD22/04
Departure Date 2004-06-09
Arrival Date 2004-06-10
Principal Scientist(s)Jason Holt (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 - 664268 664281 664293 664300 664324 1194188 1194207 1194219 1194232 1194244 1194256 1622779

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) PD22/06 (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