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Metadata Report for BODC Series Reference Number 496140


Metadata Summary

Data Description

Data Category Transmittance/attenuance, turbidity, or SPM conc.
Instrument Type Transmissometer
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) Land Ocean Interaction Study (LOIS)
LOIS Shelf Edge Study (LOIS - SES)
 

Data Identifiers

Originator's Identifier tr1762.695
BODC Series Reference 496140
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1995-08-16 08:00
End Time (yyyy-mm-dd hh:mm) 1995-09-06 08:07
Nominal Cycle Interval 60.0 seconds
 

Spatial Co-ordinates

Latitude 56.44770 N ( 56° 26.9' N )
Longitude 9.04730 W ( 9° 2.8' W )
Positional Uncertainty 0.1 to 0.5 n.miles
Minimum Sensor or Sampling Depth 1.0 m
Maximum Sensor or Sampling Depth 1.0 m
Minimum Sensor or Sampling Height 194.0 m
Maximum Sensor or Sampling Height 194.0 m
Sea Floor Depth 195.0 m
Sea Floor Depth Source -
Sensor or Sampling Distribution Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed 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
AADYAA011DaysDate (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ011DaysTime (time between 00:00 UT and timestamp)
CNDCPR011Siemens per metreElectrical conductivity of the water body by in-situ conductivity cell
PSALPR011DimensionlessPractical salinity of the water body by conductivity cell and computation using UNESCO 1983 algorithm
TEMPPR011Degrees CelsiusTemperature 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

The salinity data do not appear credible, and have all been flagged suspect.

No attenuance data are included because no calibration data were available.


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

TRB-1 and TRB-2 Self-recording Transmissometers

The TRB-1 self-recording transmissometer was designed by the School of Ocean Sciences, University of Wales, Bangor and was sometimes known as the 'Mark III Transmissometer'. The instrument was developed commercially by W.S. Ocean Systems Limited and marketed with the designation TRB-2.

The instrument used a 660nm (red) source modulated at 400 Hz. The optical assembly incorporated a folded beam design to reduce instrument size to a minimum. The light beam was collimated using an achromatic lens, passed through a fixed length of the water column and reflected back to a photodiode receiver via a prism reflector. The optical path length could be fixed at either 5 cm, 10 cm or 25 cm.

Data were logged at the top of each minute as the average of 200 samples taken at 400 Hz. Timing was based on an accurate real-time clock emulated by the processor BIOS extension. Data were acquired by a multi-channel 12- bit data acquisition system resident on the motherboard resulting in a count between 0 and 4095.

Data were stored internally on a 2 MByte SRAM card giving storage for 120 days of data. After deployment, the data were downloaded in a simple ASCII format onto a PC.

TRB-2 instruments could be fitted with additional conductivity and temperature sensors.

Data Processing: TR1762.695

Introduction

This document covers the calibration details for TRB2 transmissometer serial number 1762 deployed on POL mooring 695.

Attenuance

No calibration data were available and so no attenuace data are included in the data set.

Temperature

The temperature calibration applied is unknown. Checks against CTD data on the mooring site showed the TRB to be reading 0.19 to 0.23° low.

Conductivity

The conductivity calibration applied is not known. The conductivity sensor was obviously malfunctioning during this deployment and consequently comparison with CTD data is meaningless.

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

Land Ocean Interaction Study (LOIS)

Introduction

The Land Ocean Interaction Study (LOIS) was a Community Research Project of the Natural Environment Research Council (NERC). The broad aim of LOIS was to gain an understanding of, and an ability to predict, the nature of environmental change in the coastal zone around the UK through an integrated study from the river catchments through to the shelf break.

LOIS was a collaborative, multidisciplinary study undertaken by scientists from NERC research laboratories and Higher Education institutions. The LOIS project was managed from NERC's Plymouth Marine Laboratory.

The project ran for six years from April 1992 until April 1998 with a further modelling and synthesis phase beginning in April 1998 and ending in April 2000.

Project Structure

LOIS consisted of the following components:

  • River-Atmosphere-Coast Study (RACS)
    • RACS(A) - Atmospheric sub-component
    • RACS(C) - Coasts sub-component
    • RACS(R) - Rivers sub-component
    • BIOTA - Terrestrial salt marsh study
  • Land Ocean Evolution Perspective Study (LOEPS)
  • Shelf-Edge Study (SES)
  • North Sea Modelling Study (NORMS)
  • Data Management (DATA)

Marine Fieldwork

Marine field data were collected between September 1993 and September 1997 as part of RACS(C) and SES. The RACS data were collected throughout this period from the estuaries and coastal waters of the UK North Sea coast from Great Yarmouth to the Tweed. The SES data were collected between March 1995 and September 1996 from the Hebridean slope. Both the RACS and SES data sets incorporate a broad spectrum of measurements collected using moored instruments and research vessel surveys.


LOIS Shelf Edge Study (LOIS - SES)

Introduction

SES was a component of the NERC Land Ocean Interaction Study (LOIS) Community Research Programme that made intensive measurements from the shelf break in the region known as the Hebridean Slope from March 1995 to September 1996.

Scientific Rationale

SES was devoted to the study of interactions between the shelf seas and the open ocean. The specific objectives of the project were:

  • To identify the time and space scales of ocean-shelf momentum transmission and to quantify the contributions to ocean-shelf water exchange by physical processes.

  • To estimate fluxes of water, heat and certain dissolved and suspended constituents across a section of the shelf edge with special emphasis on net carbon export from, and nutrient import to, the shelf.

  • To incorporate process understanding into models and test these models by comparison with observations and provide a basis for estimation of fluxes integrated over time and the length of the shelf.

Fieldwork

The SES fieldwork was focussed on a box enclosing two sections across the shelf break at 56.4-56.5 °N and 56.6-56.7 °N. Moored instrument arrays were maintained throughout the experiment at stations with water depths ranging from 140 m to 1500 m, although there were heavy losses due to the intensive fishing activity in the area. The moorings included meteorological buoys, current meters, transmissometers, fluorometers, nutrient analysers (but these never returned any usable data), thermistor chains, colour sensors and sediment traps.

The moorings were serviced by research cruises at approximately three-monthly intervals. In addition to the mooring work this cruises undertook intensive CTD, water bottle and benthic surveys with cruise durations of up to 6 weeks (3 legs of approximately 2 weeks each).

Moored instrument activities associated with SES comprised current measurements in the North Channel in 1993 and the Tiree Passage from 1995-1996. These provided boundary conditions for SES modelling activities.

Additional data were provided through cruises undertaken by the Defence Evaluation and Research Agency (DERA) in a co-operative programme known as SESAME.


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 1995-08-16
End Date (yyyy-mm-dd) 1995-09-06
Organization Undertaking ActivityProudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool)
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierPOLRIG#695
Platform Categorysubsurface mooring

Proudman Oceanographic Laboratory Moored Instrument Rig #695

This rig was deployed as part of the LOIS Shelf-Edge Study at site S200.

Rig position: 56° 26.86'N 09° 02.84'W
Deployed: 16 Aug 1995 08:29
from RRS Challenger (cruise CH121A)
Recovered: 06 Sep 1995 08:09
onto RRS Challenger (cruise CH121C)

The instruments were anchored by a 500kg clump and suspended from a toroidal buoy on the surface.

Instruments deployed on the rig

Height above
Sea Bed
Instrument
1m WS Oceans transmissometer (#1762)
1m NAS2 Nutrient analyser (#1750)
1m Chelsea Instruments fluorometer (#019)
1m Colour sensor (CS22)
3m to 43m 40m thermistor chain (#1611)

Related Data Activity activities are detailed in Appendix 1

Cruise

Cruise Name CH121A
Departure Date 1995-08-10
Arrival Date 1995-08-18
Principal Scientist(s)John H Simpson (University of Wales, Bangor School of Ocean Sciences)
Ship RRS Challenger

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameLOIS(SES) S200
CategoryOffshore location
Latitude56° 27.14' N
Longitude9° 2.90' W
Water depth below MSL200.0 m

LOIS (SES) Mooring and CTD Site S200

Site S200 was a fixed station where moorings were deployed during the Land-Ocean Interaction Study (LOIS) Shelf Edge Study (SES). It was also one of fourteen CTD sites on repeat section S, across the Hebridean Slope, occupied by cruises between March 1995 and September 1996.

Instrument Deployment History

The following tables summarise the instruments deployed at this site for which data may be available.

1995

Mar Apr May Jun Jul Aug Sep Oct Nov Dec
CM a b c c c c c      
ADCP           a a      
TChn a b c c c c c d d  
Tr a b c c c c c d e e
Fl a b c c c c c d e e
NA a b     c c d      

1996

Jan Feb Mar Apr May Jun Jul Aug
CM       d        
ADCP                
TChn                
Tr       f f f f  
Fl       f f f f  
NA                

Each different letter in the tables above corresponds to an individual instrument record.

Glossary

  • CM = Current meter (Aanderaa or S4)
  • BPR = Bottom pressure recorder
  • ADCP = Acoustic Doppler Current Profiler
  • TChn = Thermistor chain
  • Tr = Transmissometer
  • Fl = Fluorometer
  • NA = Nutrient analyser

Note

  1. Transmissometers may have been fitted to some of the current meters.
  2. Other instruments (colour sensors, STABLE) may have been deployed.
  3. Only periods for which useful data were returned are shown.

Related Fixed Station activities are detailed in Appendix 2


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: POLRIG#695

Related series for this Data Activity 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
442363Hydrography time series at depth1995-08-16 08:30:0056.4477 N, 9.0473 WRRS Challenger CH121A
476175Fluorescence or pigments1995-08-16 09:09:2156.4477 N, 9.0473 WRRS Challenger CH121A

Appendix 2: LOIS(SES) S200

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
439576Hydrography time series at depth1995-03-31 20:20:0056.453 N, 9.0462 WRRS Charles Darwin CD91B
439620Hydrography time series at depth1995-03-31 20:20:0056.453 N, 9.0462 WRRS Charles Darwin CD91B
496072Transmittance/attenuance, turbidity, or SPM conc.1995-03-31 20:20:0056.453 N, 9.0462 WRRS Charles Darwin CD91B
431261Currents -subsurface Eulerian1995-03-31 20:25:0056.453 N, 9.0462 WRRS Charles Darwin CD91B
439042Currents -subsurface Eulerian1995-03-31 20:25:0056.453 N, 9.0462 WRRS Charles Darwin CD91B
439226Currents -subsurface Eulerian1995-03-31 20:25:0056.453 N, 9.0462 WRRS Charles Darwin CD91B
476199Fluorescence or pigments1995-03-31 21:02:5656.453 N, 9.0462 WRRS Charles Darwin CD91B
439588Hydrography time series at depth1995-04-17 15:30:0056.453 N, 9.0462 WRRS Charles Darwin CD92B
439632Hydrography time series at depth1995-04-17 15:30:0056.453 N, 9.0462 WRRS Charles Darwin CD92B
496084Transmittance/attenuance, turbidity, or SPM conc.1995-04-17 15:30:0056.453 N, 9.0462 WRRS Charles Darwin CD92B
431273Currents -subsurface Eulerian1995-04-17 15:35:0056.453 N, 9.0462 WRRS Charles Darwin CD92B
439054Currents -subsurface Eulerian1995-04-17 15:35:0056.453 N, 9.0462 WRRS Charles Darwin CD92B
439355Currents -subsurface Eulerian1995-04-17 15:35:0056.453 N, 9.0462 WRRS Charles Darwin CD92B
476206Fluorescence or pigments1995-04-17 16:09:2156.453 N, 9.0462 WRRS Charles Darwin CD92B
426130Currents -subsurface Eulerian1995-05-10 13:52:3056.4543 N, 9.0463 WRRS Charles Darwin CD93A
439607Hydrography time series at depth1995-05-10 14:00:0056.4543 N, 9.0463 WRRS Charles Darwin CD93A
439644Hydrography time series at depth1995-05-10 14:00:0056.4543 N, 9.0463 WRRS Charles Darwin CD93A
491891Transmittance/attenuance, turbidity, or SPM conc.1995-05-10 14:01:0056.4543 N, 9.0463 WRRS Charles Darwin CD93A
431285Currents -subsurface Eulerian1995-05-10 14:15:0056.4543 N, 9.0463 WRRS Charles Darwin CD93A
439066Currents -subsurface Eulerian1995-05-10 14:15:0056.4543 N, 9.0463 WRRS Charles Darwin CD93A
439447Currents -subsurface Eulerian1995-05-10 14:15:0056.4543 N, 9.0463 WRRS Charles Darwin CD93A
496096Transmittance/attenuance, turbidity, or SPM conc.1995-05-10 16:30:0056.4482 N, 9.0477 WRRS Charles Darwin CD93A
476102Fluorescence or pigments1995-05-10 17:02:5656.4482 N, 9.0477 WRRS Charles Darwin CD93A
439527Hydrography time series at depth1995-05-10 17:30:0056.4482 N, 9.0477 WRRS Charles Darwin CD93A
476058Fluorescence or pigments1995-07-25 12:02:5756.448 N, 9.046 WRRS Challenger CH120
390272CTD or STD cast1995-07-27 23:33:0056.4587 N, 9.05 WRRS Challenger CH120
444413Currents -subsurface Eulerian1995-08-11 05:37:0056.4458 N, 9.0465 WRRS Challenger CH121A
444185Currents -subsurface Eulerian1995-08-11 08:17:0056.4445 N, 9.0515 WRRS Challenger CH121A
439299Currents -subsurface Eulerian1995-08-11 19:17:3056.453 N, 9.0462 WRRS Challenger CH121A
442363Hydrography time series at depth1995-08-16 08:30:0056.4477 N, 9.0473 WRRS Challenger CH121A
476175Fluorescence or pigments1995-08-16 09:09:2156.4477 N, 9.0473 WRRS Challenger CH121A
444425Currents -subsurface Eulerian1996-02-01 08:17:0056.4604 N, 9.0473 WRRS Challenger CH125A
436290Currents -subsurface Eulerian1996-04-24 13:45:0056.4523 N, 9.0497 WRRS Challenger CH126A
436308Currents -subsurface Eulerian1996-04-24 13:45:0056.4523 N, 9.0497 WRRS Challenger CH126A
439091Currents -subsurface Eulerian1996-04-24 13:45:0056.4523 N, 9.0497 WRRS Challenger CH126A