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Metadata Report for BODC Series Reference Number 604960


Metadata Summary

Data Description

Data Category Hydrography time series at depth
Instrument Type
NameCategories
Aanderaa thermistor chain  water temperature sensor; thermistor chains
Instrument Mounting subsurface mooring
Originating Country United Kingdom
Originator -
Originating Organization Proudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool)
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) North Sea Project 1987-1992
 

Data Identifiers

Originator's Identifier TC1612.C57CT
BODC Series Reference 604960
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1989-08-05 06:50
End Time (yyyy-mm-dd hh:mm) 1989-09-01 05:59
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 54.33670 N ( 54° 20.2' N )
Longitude 0.39830 E ( 0° 23.9' E )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 5.0 m
Maximum Sensor or Sampling Depth 55.32 m
Minimum Sensor or Sampling Height 4.68 m
Maximum Sensor or Sampling Height 55.0 m
Sea Floor Depth 60.0 m
Sea Floor Depth Source -
Sensor or Sampling Distribution Scattered at fixed depths - The sensors are scattered with respect to depth but each remains effectively at the same depth for the duration of the series
Sensor or Sampling 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 CODERankUnitsTitle
DEPHTC010MetresDepth (spatial coordinate) relative to water surface in the water body by physical measurement and conversion from height above seabed using bathymetric depth
AADYAA011DaysDate (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ011DaysTime (time between 00:00 UT and timestamp)
TEMPTC012Degrees CelsiusTemperature of the water body by in-situ thermistor

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

Data Quality Report

A visual inspection of each individual thermistor bead series indicates generally good data.The data from thermistor bead at depth 45.3m are extremely 'noisy' throughout the deployment and data from the thermistor bead at depth 55.3m are extremely 'noisy' from 20 August to the end of the deployment. These data have subsequently been flagged as suspect.

A comparison between these data and the CTD temperature sensor data collected at the same time was also conducted. The CTD cast number with which the comparison was made is also given, this will be the CTD taken close to the time of deployment and/or recovery of the thermistor chain.

The difference between the two temperatures is listed below:

  CTD D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12
Deployment 2505 0.772 0.701 0.675 0.675 0.867 -0.238 -0.506 -0.533 -0.511   -0.440 -0.427
Recovery 2636 0.024 -0.004 -0.003 0.010 0.007 0.023 -0.030 -0.063 -0.004   0.034  

where D1 (°C) = CTD temperature - thermistor bead 1 temperature, D2 (°C) = CTD temperature - thermistor bead 2 temperature etc. Thermistor bead 1 is the top bead (i.e. the one attached to the logger) and thermistor bead 12 is the bottom bead.


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 Thermistor Chain

Instrumentation

The thermistor string comprises 11 sensors electrically connected to a logger. The sensors are equally spaced along the string; string lengths range from 10m to 400m. Sensors used are Fenwal 2K iso-curve thermistors (type GB32JM19) with time constant of approximately 3.5min for 63pcent of step change. The thermistors have identical calibration curves to within ±0.1 °C.

Standard temperature ranges are: low range (-2.46 to 21.48 °C), high range (10.08 to 36.00 °C), wide range (-0.34 to 32.17 °C). A resistor, accurate to ±0.025deg C, within the logger is used to select the range.

Calibrations

The calibration formula, corresponding to the temperature range chosen, converts the logger reading N to degrees C with an accuracy of ±0.05deg C, The worst accumulated error (taking into account the accuracy of the formula, the thermistor and the resistor) is ±0.175 °C. These errors can be reduced by carrying out temperature calibrations at 0 °C. This can give an accuracy of ±0.05 °C. The theoretical limit of accuracy is ±0.0125 °C, approx. To approach this accuracy better interpolation formulae and frequent calibrations are required.

The data are logged either by Aanderaa TR loggers or by SeaData loggers (which incorporate a temperature sensor and hence record 12 channels).

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:

  • Irregularities such as unfeasible values
  • Inconsistencies between related information, for example:
    • Times for instrument deployment and for start/end of data series
    • Length of record and the number of data cycles/cycle interval
    • Parameters expected and the parameters actually present in the data cycles
  • Originator's comments on meter/mooring performance and data quality

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:

  • Spurious data at the start or end of the record.
  • Obvious spikes occurring in periods free from meteorological disturbance.
  • A sequence of constant values in consecutive data cycles.

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:

  • Maximum and minimum values of parameters (spikes excluded).
  • The occurrence of meteorological events.

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

North Sea Project

The North Sea Project (NSP) was the first Marine Sciences Community Research project of the Natural Environment Research Council (NERC). It evolved from a NERC review of shelf sea research, which identified the need for a concerted multidisciplinary study of circulation, transport and production.

The ultimate aim of the NERC North Sea Project was the development of a suite of prognostic water quality models to aid management of the North Sea. To progress towards water quality models, three intermediate objectives were pursued in parallel:

  • Production of a 3-D transport model for any conservative passive constituent, incorporating improved representations of the necessary physics - hydrodynamics and dispersion;
  • Identifying and quantifying non-conservative processes - sources and sinks determining the cycling and fate of individual constituents;
  • Defining a complete seasonal cycle as a database for all the observational studies needed to formulate, drive and test models.

Proudman Oceanographic Laboratory hosted the project, which involved over 200 scientists and support staff from NERC and other Government funded laboratories, as well as seven universities and polytechnics.

The project ran from 1987 to 1992, with marine field data collection between April 1988 and October 1989. One shakedown (CH28) and fifteen survey cruises (Table 1), each lasting 12 days and following the same track, were repeated monthly. The track selected covered the summer-stratified waters of the north and the homogeneous waters in the Southern Bight in about equal lengths together with their separating frontal band from Flamborough head to Dogger Bank, the Friesian Islands and the German Bight. Mooring stations were maintained at six sites for the duration of the project.

Table 1: Details of NSP Survey Cruises on RRS Challenger
Cruise No. Date
CH28 29/04/88 - 15/05/88
CH33 04/08/88 - 16/08/88
CH35 03/09/88 - 15/09/88
CH37 02/10/88 - 14/10/88
CH39 01/11/88 - 13/11/88
CH41 01/12/88 - 13/12/88
CH43 30/12/88 - 12/01/89
CH45 28/01/89 - 10/02/89
CH47 27/02/89 - 12/03/89
CH49 29/03/89 - 10/04/89
CH51 27/04/89 - 09/05/89
CH53 26/05/89 - 07/06/89
CH55 24/06/89 - 07/07/89
CH57 24/07/89 - 06/08/89
CH59 23/08/89 - 04/09/89
CH61 21/09/89 - 03/10/89

Alternating with the survey cruises were process study cruises (Table 2), which investigated some particular aspect of the science of the North Sea. These included fronts (nearshore, circulation and mixing), sandwaves and sandbanks, plumes (Humber, Wash, Thames and Rhine), resuspension, air-sea exchange, primary productivity and blooms/chemistry.

Table 2: Details of NSP Process cruises on RRS Challenger
Cruise No. Date Process
CH34 18/08/88 - 01/09/88 Fronts - nearshore
CH36 16/09/88 - 30/09/88 Fronts - mixing
CH56 08/07/89 - 22/07/89 Fronts - circulation
CH58 07/08/89 - 21/08/89 Fronts - mixing
CH38 24/10/88 - 31/10/88 Sandwaves
CH40 15/11/88 - 29/11/88 Sandbanks
CH42 15/12/88 - 29/12/88 Plumes/Sandbanks
CH46 12/02/89 - 26/02/89 Plumes/Sandwaves
CH44 13/01/89 - 27/01/89 Resuspension
CH52 11/05/89 - 24/05/89 Resuspension
CH60 06/09/89 - 19/09/89 Resuspension
CH48 13/03/89 - 27/03/89 Air/sea exchanges
CH62 05/10/89 - 19/10/89 Air/sea exchanges
CH50 12/04/89 - 25/04/89 Blooms/chemistry
CH54 09/06/89 - 22/06/89 Production

In addition to the main data collection period, a series of cruises took place between October 1989 and October 1990 that followed up work done on previous cruises (Table 3). Process studies relating to blooms, plumes (Humber, Wash and Rhine), sandwaves and the flux of contaminants through the Dover Strait were carried out as well as two `survey' cruises.

Table 3: Details of NSP `Follow up' cruises on RRS Challenger
Cruise No. Date Process
CH62A 23/10/89 - 03/11/89 Blooms
CH64 03/04/90 - 03/05/90 Blooms
CH65 06/05/90 - 17/05/90 Humber plume
CH66A 20/05/90 - 31/05/90 Survey
CH66B 03/06/90 - 18/06/90 Contaminants through Dover Strait
CH69 26/07/90 - 07/08/90 Resuspension/Plumes
CH72A 20/09/90 - 02/10/90 Survey
CH72B 04/10/90 - 06/10/90 Sandwaves/STABLE
CH72C 06/10/90 - 19/10/90 Rhine plume

The data collected during the observational phase of the North Sea Project comprised one of the most detailed sets of observations ever undertaken in any shallow shelf sea at that time.


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 1989-08-05
End Date (yyyy-mm-dd) 1989-09-01
Organization Undertaking ActivityProudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool)
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierPOLRIG#C57CT
Platform Categorysubsurface mooring

North Sea Project POLRIG#C57CT

The thermistor chain mooring was deployed as part of the North Sea Project Survey at Site C.

A thermistor chain, incorporating eleven thermistor beads, was moored as a single point mooring beneath a toroidal buoy. The data logger was positioned just above the chain and also incorporated a thermistor bead. The beads were positioned at the following nominal depths below the surface of the water, the top bead is the one incorporated in the logger:

5.0m, 5.3m, 10.3m, 15.3m, 20.3m, 25.3m, 30.3m, 35.3m, 40.3m, 45.3m, 50.3m, 55.3m

The accuracy of the thermistor beads was ±0.05°C.

Mooring Position 54° 20.20'N, 00° 23.90'E
Water Depth 60.0m
Instrument Aanderaa Thermistor Chain 1612
Parameters Measured Temperature

Fixed Station Information

Fixed Station Information

Station NameNSP Survey C and CTD Site DM
CategoryOffshore location
Latitude54° 19.80' N
Longitude0° 24.00' E
Water depth below MSL60.0 m

North Sea Project Survey Mooring Site C and CTD Site DM

Site C was one of six fixed stations where moorings were deployed during the North Sea Project Survey. This location is also one of 123 North Sea Project CTD Sites.

The site was characterised by moderate tidal currents, up to a maximum of 1.1 m/s. In summer months, the site was situated in a frontal region between stratified water to the north and vertically well mixed water to the south.

The rigs deployed here lie within a box bounded by co-ordinates 54.32N 0.393E at the southwest corner and 54.34N 0.422E at the northeast corner. Magnetic variation at this site was 4.9° west.

Site C deployment history is summarised below:

Rig ID Meter type Meter height Start date Data return (days) Comment
C33CC

ADCP

CM

0.8m

0.8m

13/08/88

13/08/88

0.0

29.5

Data corrupt

N/A

C33CT THCH   13/08/88 30 Good data
C35CT THCH   12/09/88 24 Good data
C36CC

ADCP

CM

0.8m

0.8m

18/09/88

18/09/88

0.0

20.8

Data corrupt

N/A

C37CC

ADCP

CM

0.8m

0.8m

09/10/88

09/10/88

30.4

30.7

 
C39CC

ADCP

CM

0.8m

0.8m

10/11/88

10/11/88

27.1

27.1

 
C41CC

ADCP

CM

0.8m

0.8m

07/12/88

07/12/88

0.0

24.9

Data corrupt
C43CC ADCP 0.8m 01/01/89 37.1  
C45CC ADCP 0.8m 07/02/89 27.7  
C47CC ADCP 0.8m 09/03/89 29.7  
C49CC

ADCP

CM

0.8m

0.8m

08/04/89

08/04/89

28.2

28.2

 
C49CT THCH   08/04/89 28 Data for 5.0m thermistor bead only
C51CC

ADCP

CM

0.8m

0.8m

06/05/89

06/05/89

22.6

28.5

 
C51CT THCH   06/05/89 29 Data for 5.0m thermistor bead only
C53CC

ADCP

CM

0.8m

0.8m

04/06/89

04/06/89

4.0

28.8

 
C53CT THCH   04/06/89 29 All data except, 5.0m thermistor bead data, extremely 'noisy'
C55CC

ADCP

CM

0.8m

0.8m

03/07/89

03/07/89

29.0

29.0

Rig trawled 01/08/89

Rig trawled 01/08/89

C55CT THCH   03/07/89 33 Good data
C57CC

ADCP

CM

0.8m

0.8m

05/08/89

05/08/89

26.9

26.9

 
C57CT THCH   05/08/89 27 Good data in all but 2 thermistor bead depths
C59CC

ADCP

CM

0.8m

0.8m

01/09/89

01/09/89

29.4

29.4

 
C59CT THCH   01/09/89 29 Good data in all but 3 thermistor bead depths

ADCP = Acoustic Doppler Current Profiler
CM = Current Meter (Aanderaa or S4)
THCH = Thermistor Chain

Related Fixed Station activities are detailed in Appendix 1


BODC Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

Flag Description
Blank Unqualified
< Below detection limit
> In excess of quoted value
A Taxonomic flag for affinis (aff.)
B Beginning of CTD Down/Up Cast
C Taxonomic flag for confer (cf.)
D Thermometric depth
E End of CTD Down/Up Cast
G Non-taxonomic biological characteristic uncertainty
H Extrapolated value
I Taxonomic flag for single species (sp.)
K Improbable value - unknown quality control source
L Improbable value - originator's quality control
M Improbable value - BODC quality control
N Null value
O Improbable value - user quality control
P Trace/calm
Q Indeterminate
R Replacement value
S Estimated value
T Interpolated value
U Uncalibrated
W Control value
X Excessive difference

SeaDataNet Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

Flag Description
0 no quality control
1 good value
2 probably good value
3 probably bad value
4 bad value
5 changed value
6 value below detection
7 value in excess
8 interpolated value
9 missing value
A value phenomenon uncertain
Q value below limit of quantification

Appendix 1: NSP Survey C and CTD Site DM

Related series for this Fixed Station are presented in the table below. Further information can be found by following the appropriate links.

If you are interested in these series, please be aware we offer a multiple file download service. Should your credentials be insufficient for automatic download, the service also offers a referral to our Enquiries Officer who may be able to negotiate access.

Series IdentifierData CategoryStart date/timeStart positionCruise
580058Hydrography time series at depth1988-08-13 19:59:5954.3317 N, 0.4035 ENot applicable
604959Hydrography time series at depth1988-08-13 20:30:0054.3317 N, 0.4 ENot applicable
769888CTD or STD cast1988-08-13 20:32:0054.32933 N, 0.40117 ERRS Challenger CH33
770017CTD or STD cast1988-08-15 01:44:0054.31817 N, 0.47 ERRS Challenger CH33
811184CTD or STD cast1988-08-27 22:16:0054.336 N, 0.34383 ERRS Challenger CH34
783986CTD or STD cast1988-09-12 08:38:0054.3335 N, 0.402 ERRS Challenger CH35
605011Hydrography time series at depth1988-09-12 09:40:3854.3348 N, 0.3988 ENot applicable
580126Hydrography time series at depth1988-09-18 19:20:0754.3437 N, 0.3948 ENot applicable
812010CTD or STD cast1988-09-18 20:03:0054.33167 N, 0.39467 ERRS Challenger CH36
784603CTD or STD cast1988-10-09 12:52:0054.3295 N, 0.43017 ERRS Challenger CH37
580114Hydrography time series at depth1988-10-09 14:50:0054.3332 N, 0.4037 ENot applicable
604100Currents -subsurface Eulerian1988-10-09 14:57:1254.3332 N, 0.4037 ENot applicable
580102Hydrography time series at depth1988-11-10 08:00:0154.334 N, 0.4098 ENot applicable
604093Currents -subsurface Eulerian1988-11-10 08:07:0654.334 N, 0.4098 ENot applicable
822305CTD or STD cast1988-11-11 18:44:0054.33167 N, 0.3995 ERRS Challenger CH39
785225CTD or STD cast1988-12-07 08:58:0054.3205 N, 0.397 ERRS Challenger CH41
580071Hydrography time series at depth1988-12-07 12:40:0054.3327 N, 0.417 ENot applicable
785993CTD or STD cast1989-01-01 09:00:0054.332 N, 0.40133 ERRS Challenger CH43
604020Currents -subsurface Eulerian1989-01-01 11:17:1354.3318 N, 0.4217 ENot applicable
791949CTD or STD cast1989-02-07 12:44:0054.33317 N, 0.39383 ERRS Challenger CH45
604019Currents -subsurface Eulerian1989-02-07 14:16:4954.3327 N, 0.421 ENot applicable
793089CTD or STD cast1989-03-07 06:32:0054.33267 N, 0.39767 ERRS Challenger CH47
1857825Water sample data1989-03-07 06:35:0054.33264 N, 0.39771 ERRS Challenger CH47
793680CTD or STD cast1989-03-07 06:52:0054.33367 N, 0.40333 ERRS Challenger CH47
604068Currents -subsurface Eulerian1989-03-09 15:16:5754.3302 N, 0.3975 ENot applicable
793378CTD or STD cast1989-03-09 15:24:0054.32767 N, 0.39667 ERRS Challenger CH47
1858110Water sample data1989-03-09 15:27:0054.32767 N, 0.39662 ERRS Challenger CH47
604947Hydrography time series at depth1989-04-08 09:29:5754.3377 N, 0.4027 ENot applicable
603993Currents -subsurface Eulerian1989-04-08 09:37:0654.33 N, 0.3993 ENot applicable
591751Currents -subsurface Eulerian1989-04-08 09:40:0054.33 N, 0.3993 ENot applicable
794505CTD or STD cast1989-04-08 09:52:0054.33383 N, 0.39733 ERRS Challenger CH49
1859186Water sample data1989-04-08 09:56:0054.33377 N, 0.3974 ERRS Challenger CH49
795613CTD or STD cast1989-05-06 15:13:0054.33033 N, 0.40067 ERRS Challenger CH51
1861455Water sample data1989-05-06 15:24:0054.33025 N, 0.40067 ERRS Challenger CH51
604996Hydrography time series at depth1989-05-06 16:26:1554.3285 N, 0.4043 ENot applicable
591787Currents -subsurface Eulerian1989-05-06 16:50:0054.331 N, 0.4035 ENot applicable
604081Currents -subsurface Eulerian1989-05-06 16:57:0854.331 N, 0.4035 ENot applicable
796991CTD or STD cast1989-06-04 06:44:0054.33033 N, 0.40117 ERRS Challenger CH53
1864035Water sample data1989-06-04 06:49:0054.33041 N, 0.40124 ERRS Challenger CH53
604984Hydrography time series at depth1989-06-04 07:58:0854.3385 N, 0.3965 ENot applicable
604044Currents -subsurface Eulerian1989-06-04 08:07:0854.3403 N, 0.3938 ENot applicable
580083Hydrography time series at depth1989-06-04 08:10:0254.3403 N, 0.3938 ENot applicable
798266CTD or STD cast1989-07-03 03:22:0054.3315 N, 0.4015 ERRS Challenger CH55
1657208Water sample data1989-07-03 03:28:0054.33154 N, 0.40146 ERRS Challenger CH55
1866484Water sample data1989-07-03 03:28:0054.33154 N, 0.40146 ERRS Challenger CH55
604972Hydrography time series at depth1989-07-03 05:41:3054.3372 N, 0.3962 ENot applicable
591775Currents -subsurface Eulerian1989-07-03 05:47:0054.3398 N, 0.395 ENot applicable
604032Currents -subsurface Eulerian1989-07-03 05:47:1154.3398 N, 0.395 ENot applicable
799743CTD or STD cast1989-08-05 05:16:0054.33283 N, 0.4185 ERRS Challenger CH57
1246556Water sample data1989-08-05 05:19:0054.33279 N, 0.41858 ERRS Challenger CH57
1710012Water sample data1989-08-05 05:19:0054.33279 N, 0.41858 ERRS Challenger CH57
1865388Water sample data1989-08-05 05:19:0054.33279 N, 0.41858 ERRS Challenger CH57
591763Currents -subsurface Eulerian1989-08-05 06:50:0054.34 N, 0.396 ENot applicable
604007Currents -subsurface Eulerian1989-08-05 06:57:1054.34 N, 0.396 ENot applicable
802156CTD or STD cast1989-09-01 03:13:0054.33067 N, 0.40533 ERRS Challenger CH59
1856846Water sample data1989-09-01 03:19:0054.3306 N, 0.4053 ERRS Challenger CH59
605023Hydrography time series at depth1989-09-01 06:48:1054.337 N, 0.4003 ENot applicable
591799Currents -subsurface Eulerian1989-09-01 07:05:0054.3405 N, 0.399 ENot applicable
604124Currents -subsurface Eulerian1989-09-01 07:07:1154.3405 N, 0.399 ENot applicable
800819CTD or STD cast1989-09-30 17:01:0054.33517 N, 0.40267 ERRS Challenger CH61
1855578Water sample data1989-09-30 17:05:0054.33516 N, 0.40264 ERRS Challenger CH61
805302CTD or STD cast1990-10-01 09:23:0054.333 N, 0.397 ERRS Challenger CH72A