Metadata Report for BODC Series Reference Number 476163
Metadata Summary
Problem Reports
Data Access Policy
Narrative Documents
Project Information
Data Activity or Cruise Information
Fixed Station Information
BODC Quality Flags
SeaDataNet Quality Flags
Metadata Summary
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Problem Reports
No Problem Report Found in the Database
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
Aquatracka fluorometer
The Chelsea Instruments Aquatracka is a logarithmic response fluorometer. It uses a pulsed (5.5 Hz) xenon light source discharging between 320 and 800 nm through a blue filter with a peak transmission of 420 nm and a bandwidth at half maximum of 100 nm. A red filter with sharp cut off, 10% transmission at 664 nm and 678 nm, is used to pass chlorophyll-a fluorescence to the sample photodiode.
The instrument may be deployed either in a through-flow tank, on a CTD frame or moored with a data logging package.
Further details can be found in the manufacturer's specification sheet.
Data Processing Notes
The following calibration was applied:
Chlorophyll (mg/m3) = -0.004744 * dark corrected signal
Fluorometer Data Processing
Data Originator's Processing
The data were logged as raw counts every three minutes which were then averaged over hourly intervals. The time stamp given is the time at the end of the interval. An unusual feature of the data was that the last averaging interval of each month was two hours rather than one hour. The resulting gap in the time channel is real and not an artefact of time channel generation.
The signal (raw counts) was transformed and corrected for dark current using a reading in the dark to give a dark corrected signal.
BODC Data Processing and Quality Control
BODC screened both the series header qualifying information and the parameter values in the data cycles themselves.
Header information was inspected for:
- Irregularities such as unfeasible values.
- Inconsistencies between related information. For example:
- Depths of meter and sea bed
- Times for mooring deployment/recovery and series start/end
- Length of record and number of data cycles/cycle interval/clock error
- Parameters reported in the header and the parameters actually present in the data cycles.
- Originator's comments on meter/mooring performance and data quality
Problem Report documents were written by BODC to highlight any problems that cannot be resolved.
Data cycles were inspected using time series plots of all parameters. Any values considered to be erroneous have either been flagged as suspect ('M') or have been documented in a Problem Report.
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:
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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.
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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.
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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) | 1995-07-24 |
End Date (yyyy-mm-dd) | 1995-08-15 |
Organization Undertaking Activity | Proudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool) |
Country of Organization | United Kingdom |
Originator's Data Activity Identifier | POLRIG#739 |
Platform Category | subsurface mooring |
Proudman Oceanographic Laboratory Moored Instrument Rig #739
This rig was deployed as part of the LOIS Shelf-Edge Study at site S140.
Rig position: | 56° 27.96'N 08° 57.11'W |
---|---|
Deployed: | 24 Jul 1995 17:20 from RRS Challenger (cruise CH120) |
Recovered: | 15 Aug 1995 10:55 from RRS Challenger (cruise CH121A) |
The instruments were anchored by a clump and suspended from a toroidal buoy on the surface.
Instruments deployed on the rig
1m | WS Oceans transmissometer (#1683) |
1m | Chelsea Instruments fluorometer (#009) |
1m | Colour sensor (#CS20) |
3m to 43m | 40m thermistor chain (#2331) |
Related Data Activity activities are detailed in Appendix 1
Cruise
Cruise Name | CH120 |
Departure Date | 1995-07-18 |
Arrival Date | 1995-08-06 |
Principal Scientist(s) | Anton Edwards (Dunstaffnage Marine Laboratory) |
Ship | RRS Challenger |
Complete Cruise Metadata Report is available here
Fixed Station Information
Fixed Station Information
Station Name | LOIS(SES) S140 |
Category | Offshore location |
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.
1995
Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|
CM | a | a | b | b | c | c | d | |||
Met | a | a | b | b | b | b | b | |||
BPR | a | a | b | b | b | c | c | d | d | e |
ADCP | a | a | a | b | b | c | c | d | ||
TChn | a | a | a | b | c | d | d | |||
Tr | a | a | a | b | c | d | e | e | ||
Fl | a | a | a | b | c | d | e | e | ||
NA | a | a | ||||||||
WR | a | a | a | |||||||
OCS | a | a | a | b |
1996
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | |
---|---|---|---|---|---|---|---|---|
CM | d | d | e | e | f | f | f | g |
Met | c | c | c | c | ||||
BPR | e | e | f | f | g | g | g | h |
ADCP | d | d | e | e | f | f | f | g |
TChn | e | e | e | f | ||||
Tr | f | f | g | g | g | h | ||
Fl | f | f | g | g | g | h | ||
NA | b | b | b | |||||
OCS | c | c | c |
Each different letter in the tables above corresponds to an individual instrument record.
Glossary
- 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
Notes
- 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 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 |
B | nominal value |
Q | value below limit of quantification |
Appendix 1: POLRIG#739
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 Identifier | Data Category | Start date/time | Start position | Cruise |
---|---|---|---|---|
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 |
506062 | PAR radiance and irradiance | 1995-07-25 12:01:00 | 56.466 N, 8.9518 W | RRS Challenger CH120 |
Appendix 2: 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 |
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 |
477210 | Currents -subsurface Eulerian | 1996-07-13 12:29:00 | 56.4595 N, 8.9613 W | RRS Challenger CH128A |
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 |