Metadata Report for BODC Series Reference Number 477210
The data contained a number of obvious spikes. In bins 1 (the deepest) to 20 (42.5 meters) the spikes could easily be identified and have been flagged suspect. From bin 21 (37.5 meters) and above, there was a noticable increase in the noise level and only the extreme spikes could be flagged. It was deemed impossible to flag any points in bin 25 (17.5 meters) as the noise level was such that neither the spikes could not be differentiated from signal.
The noise levels were fairly consistent throughout the record but were observed as being slightly less between 16 July to 18 July inclusive.
Users are advised that the quality of the data from the top 5 bins (shallower than 37.5 meters) is significantly lower than the data from the deeper bins. Data from bin 25 (17.5 m) should especially be used with caution.
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."
RDI Acoustic Doppler Current Profiler
Acoustic Doppler Current Profilers (ADCPs) use sound waves to determine vertical profiles of currents, and may be deployed fixed to the sea floor, attached to a surface buoy, mounted on the hull of a ship, towed behind a ship or lowered on a cable.
ADCPs transmit sound bursts into the water. Particles carried by the water currents scatter the sound back to the transducer. As echoes return from further ranges from the sensor, the instrument assigns different water depths to the returning signals. Motion of the scattering particles relative to the sound source causes a change in the frequency of the sound (known as Doppler shift). The ADCP measures this change to produce vertical profiles of water velocity at up to 128 depths throughout the water column.
number of depth cells 1 to 128;
size of depth cells 0.12 to 32.00 metres;
velocity range +/- 10 m/s.
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.
Land Ocean Interaction Study (LOIS)
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.
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 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)
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.
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.
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.
|Start Date (yyyy-mm-dd)||1996-07-13|
|End Date (yyyy-mm-dd)||1996-07-28|
|Organization Undertaking Activity||Proudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool)|
|Country of Organization||United Kingdom|
|Originator's Data Activity Identifier||POLRIG#777|
|Platform Category||fixed benthic node|
Proudman Oceanographic Laboratory Moored Instrument Rig #777
This rig was deployed as part of the LOIS Shelf-Edge Study at site S140
|Rig position||56° 27.57' N 08° 57.68' W|
|Deployed||13 Jul 1996 12:25 |
from RRS Challenger (cruise CH128A)
|Recovered||28 Jul 1996 11:18 |
from RRS Challenger (Cruise CH128B)
Instruments deployed on the rig
|Height above Sea Bed||Instrument|
|0.5m||Aanderaa Bottom Pressure Recorder (#445)|
|0.5m||RDI Broad Band Acoustic Doppler Current Profiler (#1149)|
Bottom pressure recorder returned no data.
|Principal Scientist(s)||John H Simpson (University of Wales, Bangor School of Ocean Sciences)|
Complete Cruise Metadata Report is available here
Fixed Station Information
|Station Name||LOIS(SES) S140|
|Latitude||56° 27.14' N|
|Longitude||8° 58.27' W|
|Water depth below MSL||145.0 m|
LOIS (SES) Mooring and CTD Site S140
Site S140 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.
Each different letter in the tables above corresponds to an individual instrument record.
- CM = Current meter (Aanderaa or S4)
- Met = Meteorology
- BPR = Bottom pressure recorder
- ADCP = Acoustic doppler current profiler
- TChn = Thermistor chain
- Tr = Transmissometer
- Fl = Fluorometer
- NA = Nutrient analyser
- WR = Waverider
- OCS = Ocean colour sensor
- Transmissometers may have been fitted to some of the current meters.
- Only periods for which useful data were returned are shown.
Related Fixed Station activities are detailed in Appendix 1
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
|<||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.)|
|E||End of CTD Down/Up Cast|
|G||Non-taxonomic biological characteristic uncertainty|
|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|
|O||Improbable value - user quality control|
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
|0||no quality control|
|2||probably good value|
|3||probably bad value|
|6||value below detection|
|7||value in excess|
|A||value phenomenon uncertain|
|Q||value below limit of quantification|
Appendix 1: LOIS(SES) S140
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 Identifier||Data Category||Start date/time||Start position||Cruise|
|427378||Meteorology -meteorological data buoy||1995-03-23 16:41:55||56.4523 N, 8.9712 W||Not applicable|
|442639||Offshore sea floor pressure series||1995-03-27 22:45:30||56.4587 N, 8.9745 W||RRS Charles Darwin CD91B|
|439171||Currents -subsurface Eulerian||1995-03-31 13:35:00||56.4678 N, 8.9612 W||RRS Charles Darwin CD91B|
|439183||Currents -subsurface Eulerian||1995-03-31 13:35:00||56.4678 N, 8.9612 W||RRS Charles Darwin CD91B|
|444204||Currents -subsurface Eulerian||1995-05-08 08:45:00||56.4608 N, 8.9652 W||RRS Charles Darwin CD93A|
|442676||Offshore sea floor pressure series||1995-05-08 08:45:30||56.4608 N, 8.9652 W||RRS Charles Darwin CD93A|
|426117||Currents -subsurface Eulerian||1995-05-09 09:32:30||56.4687 N, 8.961 W||RRS Charles Darwin CD93A|
|442547||Hydrography time series at depth||1995-05-09 10:00:00||56.4687 N, 8.961 W||RRS Charles Darwin CD93A|
|442559||Hydrography time series at depth||1995-05-09 10:00:00||56.4687 N, 8.961 W||RRS Charles Darwin CD93A|
|439484||Currents -subsurface Eulerian||1995-05-09 15:45:00||56.4687 N, 8.961 W||RRS Charles Darwin CD93A|
|496059||Transmittance/attenuance, turbidity, or SPM conc.||1995-05-15 09:56:00||56.4663 N, 8.9618 W||RRS Charles Darwin CD93A|
|476046||Fluorescence or pigments||1995-05-15 11:02:57||56.4663 N, 8.9618 W||RRS Charles Darwin CD93A|
|506050||PAR radiance and irradiance||1995-05-15 12:01:00||56.4663 N, 8.9618 W||RRS Charles Darwin CD93A|
|496060||Transmittance/attenuance, turbidity, or SPM conc.||1995-07-24 17:15:00||56.466 N, 8.9518 W||RRS Challenger CH120|
|439496||Hydrography time series at depth||1995-07-24 17:30:00||56.466 N, 8.9518 W||RRS Challenger CH120|
|476163||Fluorescence or pigments||1995-07-24 20:09:18||56.466 N, 8.9518 W||RRS Challenger CH120|
|506062||PAR radiance and irradiance||1995-07-25 12:01:00||56.466 N, 8.9518 W||RRS Challenger CH120|
|436185||Currents -subsurface Eulerian||1995-08-11 19:17:30||56.4623 N, 8.9639 W||RRS Challenger CH121A|
|439503||Hydrography time series at depth||1995-08-11 19:18:00||56.4623 N, 8.9639 W||RRS Challenger CH121A|
|426129||Currents -subsurface Eulerian||1995-08-11 19:22:30||56.4623 N, 8.9639 W||RRS Challenger CH121A|
|496127||Transmittance/attenuance, turbidity, or SPM conc.||1995-08-15 19:04:03||56.4665 N, 8.9617 W||RRS Challenger CH121A|
|439668||Hydrography time series at depth||1995-08-15 19:26:00||56.4665 N, 8.9617 W||RRS Challenger CH121A|
|476071||Fluorescence or pigments||1995-08-15 20:02:56||56.4665 N, 8.9617 W||RRS Challenger CH121A|
|427366||Meteorology -meteorological data buoy||1995-08-17 11:30:53||56.4552 N, 8.974 W||Not applicable|
|442688||Offshore sea floor pressure series||1995-08-17 12:40:30||56.4605 N, 8.9672 W||RRS Challenger CH121A|
|444216||Currents -subsurface Eulerian||1995-08-17 12:41:00||56.4605 N, 8.9672 W||RRS Challenger CH121A|
|439379||Currents -subsurface Eulerian||1995-09-02 08:44:00||56.4618 N, 8.9642 W||RRS Challenger CH121C|
|439515||Hydrography time series at depth||1995-09-02 09:00:00||56.4618 N, 8.9642 W||RRS Challenger CH121C|
|436197||Currents -subsurface Eulerian||1995-09-02 09:15:00||56.4618 N, 8.9642 W||RRS Challenger CH121C|
|496139||Transmittance/attenuance, turbidity, or SPM conc.||1995-09-04 16:12:00||56.4663 N, 8.9588 W||RRS Challenger CH121C|
|476083||Fluorescence or pigments||1995-09-04 17:02:56||56.4663 N, 8.9588 W||RRS Challenger CH121C|
|442640||Offshore sea floor pressure series||1995-09-04 18:30:21||56.4637 N, 8.9665 W||RRS Challenger CH121C|
|444197||Currents -subsurface Eulerian||1995-09-04 18:34:59||56.4637 N, 8.9665 W||RRS Challenger CH121C|
|507815||Waves (unspecified)||1995-09-05 18:00:00||56.4578 N, 8.9705 W||RRS Challenger CH121C|
|436148||Currents -subsurface Eulerian||1995-11-19 17:15:00||56.4487 N, 8.9794 W||RRS Challenger CH123A|
|439367||Currents -subsurface Eulerian||1995-11-19 17:15:00||56.4487 N, 8.9627 W||RRS Challenger CH123A|
|442664||Offshore sea floor pressure series||1995-11-19 17:30:25||56.4485 N, 8.98383 W||RRS Challenger CH123A|
|444241||Currents -subsurface Eulerian||1995-11-19 17:34:59||56.4485 N, 8.9838 W||RRS Challenger CH123A|
|496152||Transmittance/attenuance, turbidity, or SPM conc.||1995-11-27 15:54:59||56.4453 N, 8.9758 W||RRS Challenger CH123A|
|476231||Fluorescence or pigments||1995-11-27 20:01:48||56.4453 N, 8.9758 W||RRS Challenger CH123A|
|436228||Currents -subsurface Eulerian||1996-02-01 09:45:00||56.4602 N, 8.9645 W||RRS Challenger CH125A|
|439380||Currents -subsurface Eulerian||1996-02-01 09:45:00||56.4602 N, 8.9645 W||RRS Challenger CH125A|
|442719||Offshore sea floor pressure series||1996-02-01 11:50:21||56.4585 N, 8.9632 W||RRS Challenger CH125A|
|489769||Currents -subsurface Eulerian||1996-02-01 11:55:00||56.4585 N, 8.9632 W||RRS Challenger CH125A|
|491909||Transmittance/attenuance, turbidity, or SPM conc.||1996-02-01 13:17:00||56.4588 N, 8.967 W||RRS Challenger CH125A|
|476138||Fluorescence or pigments||1996-02-01 16:02:53||56.4588 N, 8.967 W||RRS Challenger CH125A|
|427391||Meteorology -meteorological data buoy||1996-04-15 13:05:52||56.4537 N, 8.9632 W||Not applicable|
|496164||Transmittance/attenuance, turbidity, or SPM conc.||1996-04-17 08:05:00||56.4672 N, 8.9627 W||RRS Challenger CH126A|
|477246||Hydrography time series at depth||1996-04-17 08:10:00||56.4672 N, 8.9627 W||RRS Challenger CH126A|
|506086||PAR radiance and irradiance||1996-04-17 12:11:00||56.4672 N, 8.9627 W||RRS Challenger CH126A|
|442479||Hydrography time series at depth||1996-04-17 12:30:00||56.4672 N, 8.9627 W||RRS Challenger CH126A|
|476151||Fluorescence or pigments||1996-04-17 15:02:57||56.4633 N, 8.9585 W||RRS Challenger CH126A|
|438874||Currents -subsurface Eulerian||1996-04-17 15:15:00||56.4633 N, 8.9585 W||RRS Challenger CH126A|
|439411||Currents -subsurface Eulerian||1996-04-17 15:30:00||56.4633 N, 8.9585 W||RRS Challenger CH126A|
|442584||Hydrography time series at depth||1996-04-17 15:30:00||56.462 N, 8.9615 W||RRS Challenger CH126A|
|442596||Hydrography time series at depth||1996-04-17 15:30:00||56.462 N, 8.9615 W||RRS Challenger CH126A|
|438929||Currents -subsurface Eulerian||1996-04-17 19:15:00||56.4633 N, 8.9585 W||RRS Challenger CH126A|
|477209||Currents -subsurface Eulerian||1996-04-24 08:34:59||56.4588 N, 8.9608 W||RRS Challenger CH126A|
|442387||Hydrography time series at depth||1996-07-13 15:44:00||56.4565 N, 8.9658 W||RRS Challenger CH128A|
|477399||Hydrography time series at depth||1996-07-13 15:44:00||56.4565 N, 8.9658 W||RRS Challenger CH128A|
|444437||Currents -subsurface Eulerian||1996-07-13 15:45:00||56.4565 N, 8.9658 W||RRS Challenger CH128A|
|439029||Currents -subsurface Eulerian||1996-07-13 16:05:30||56.4565 N, 8.9658 W||RRS Challenger CH128A|