Metadata Report for BODC Series Reference Number 517582

Metadata Summary

Data Description

Data Category Multiple data types -fixed platform
Instrument Type
Sediment Transport and Boundary Layer Equipment Mark II  sea level recorders; current meters; current profilers; water temperature sensor; water pressure sensors
Instrument Mounting fixed benthic node
Originating Country United Kingdom
Originator -
Originating Organization Proudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool)
Processing Status banked
Project(s) OMEX II-II

Data Identifiers

Originator's Identifier stablecd110
BODC Series Reference 517582

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1997-12-27 11:18
End Time (yyyy-mm-dd hh:mm) 1998-01-14 13:03
Nominal Cycle Interval 60.0 seconds

Spatial Co-ordinates

Latitude 42.67800 N ( 42° 40.7' N )
Longitude 9.50870 W ( 9° 30.5' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor Depth 201.05 m
Maximum Sensor Depth 202.78 m
Minimum Sensor Height 0.21 m
Maximum Sensor Height 1.94 m
Sea Floor Depth 203.0 m
Sensor 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 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


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)
HEADCM01 1 Degrees Platform_Heading Orientation (horizontal relative to true north) of measurement device {heading}
LCDAEL01 1 Degrees True CurrDir Current direction (Eulerian) in the water body by in-situ current meter and correction to true North
LCSAEL01 1 Centimetres per second CurrSpd_CM Current speed (Eulerian) in the water body by in-situ current meter
LCSAEL02 1 Centimetres per second CurrSpd2 Current speed (Eulerian) in the water body by in-situ current meter
LCSAEL03 1 Centimetres per second CurrSpd3 Current speed (Eulerian) in the water body by in-situ current meter
LCSAEL04 1 Centimetres per second CurrSpd4 Current speed (Eulerian) in the water body by in-situ current meter
PREXPS01 1 Decibars MeasPress_SL Pressure (measured variable) exerted by the water body by fixed in-situ pressure sensor and corrected to read zero at sea level
PTCHEI01 1 Degrees Pitch_(Electromech) Orientation (pitch) of measurement platform by inclinometer
ROLLEI01 1 Degrees Roll_(Electromech) Orientation (roll angle) of measurement platform by inclinometer
TEMPPR01 1 Degrees Celsius Temp Temperature 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

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

Sediment Transport and Boundary Layer Equipment Mark II (STABLE2)

Pop-up STABLE2 is a benthic lander consisting of a large aluminium frame standing on tripod legs, designed and built at the Proudman Oceanographic Laboratory. It is fitted with syntactic foam buoyancy, two Benthos transponding releases, mechanical releases and disposable ballast. When the Benthos releases receive a coded acoustic command from the mother ship, the ballast is released and the instrument pops up to the surface.

Current speeds are measured at four heights by Savonius rotor meters. Current direction is measured by a single vane.

Instruments on the frame

Height above
sea bed
1.950 m D/Q pressure sensor
1.350 m "Mean" logger with temperature sensor and the compass
0.907 m Vane
0.762 m R4 Savonius rotor
0.582 m R3 Savonius rotor
0.402 m R2 Savonius rotor
0.222 m R1 Savonius rotor

For more information refer to POL Report No 37 1994
(Description and Interpretation of Data Recorded by STABLE II During Charles Darwin Cruise 84, OMEX, Goban Spur, January 1994; J.D. Humphery and S.P. Moores).

BODC Current Meter Screening

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 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 following types of irregularity, each relying on visual detection in the time series plot, are amongst those which may be flagged as suspect:

If a large percentage of the data is affected by irregularities, deemed abnormal, then instead of flagging the individual suspect values, a caution may be documented. Likewise documents will highlight irregularities seen in the current vector scatter plots such as incongruous centre holes, evidence of mooring 'knock-down', abnormal asymmetry in tidally dominated records or gaps as when a range of speeds or directions go unregistered due to meter malfunction.

The term 'knock-down' refers to the situation when the 'drag' exerted on a mooring at high current speeds may cause instruments to tilt beyond the angle at which they are intended to operate. At this point the efficiency of the current sensors to accurately record the flow is reduced.

Inconsistencies between the characteristics of the data set and those of its neighbours are sought, and where necessary, documented. This covers inconsistencies in 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.

Sensor Configuration

Data channels and the related instrument heights above sea bed:

Parameter Height Above Sea Bed
PRESPS01 1.950 m
HEADCM01 1.350 m
PTCHEI01 1.350 m
ROLLEI01 1.350 m
TEMPPR01 1.350 m
LCDAEL01 0.907 m
LCSAEL04 0.762 m
LCSAEL03 0.582 m
LCSAEL02 0.402 m
LCSAEL01 0.222 m

Project Information

Ocean Margin EXchange (OMEX) II - II


OMEX was a European multidisciplinary oceanographic research project that studied and quantified the exchange processes of carbon and associated elements between the continental shelf of western Europe and the open Atlantic Ocean. The project ran in two phases known as OMEX I (1993-1996) and OMEX II - II (1997-2000), with a bridging phase OMEX II - I (1996-1997). The project was supported by the European Union under the second and third phases of its MArine Science and Technology Programme (MAST) through contracts MAS2-CT93-0069 and MAS3-CT97-0076. It was led by Professor Roland Wollast from Université Libre de Bruxelles, Belgium and involved more than 100 scientists from 10 European countries.

Scientific Objectives

The aim of the Ocean Margin EXchange (OMEX) project was to gain a better understanding of the physical, chemical and biological processes occurring at the ocean margins in order to quantify fluxes of energy and matter (carbon, nutrients and other trace elements) across this boundary. The research culminated in the development of quantitative budgets for the areas studied using an approach based on both field measurements and modeling.

OMEX II - II (1997-2000)

The second phase of OMEX concentrated exclusively on the Iberian Margin, although RV Belgica did make some measurements on La Chapelle Bank whilst on passage to Zeebrugge. This is a narrow-shelf environment, which contrasts sharply with the broad shelf adjacent to the Goban Spur. This phase of the project was also strongly multidisciplinary in approach, covering physics, chemistry, biology and geology.

There were a total of 33 OMEX II - II research cruises, plus 23 CPR tows, most of which were instrumented. Some of these cruises took place before the official project start date of June 1997.

Data Availability

Field data collected during OMEX II - II have been published by BODC as a CD-ROM product, entitled:

Further descriptions of this product and order forms may be found on the BODC web site.

The data are also held in BODC's databases and subsets may be obtained by request from BODC.

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 1997-12-27
End Date (yyyy-mm-dd) 1998-01-14
Organization Undertaking ActivityProudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool)
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierSTABLE2
Platform Categoryfixed benthic node

Deployment Details


Site O2P200
Position 42.6780° N, 9.5087° W
Water depth 203 m
Deployed 27.12.1997 11:17
from RRS Charles Darwin (CD110A)
Recovered 14.01.1998 15:00
from RRS Charles Darwin (CD110A)

Other Series linked to this Data Activity - 517601


Cruise Name CD110A
Departure Date 1997-12-23
Arrival Date 1998-01-05
Principal Scientist(s)John Huthnance (Proudman Oceanographic Laboratory)
Ship RRS Charles Darwin

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

Station NameO2P200
CategoryOffshore location
Latitude42° 40.68' N
Longitude9° 30.52' W
Water depth below MSL200.0 m

OMEX II Fixed Station O2P200

At this site the following moorings were deployed:

Mooring Period
ADCP Jun 1997 - Dec 1997
STABLE2 Dec 1997 - Jan 1998
STABLE2 Aug 1998

Other Series linked to this Fixed Station for this cruise - 517601

Other Cruises linked to this Fixed Station (with the number of series) - CD105B (1) CD114A (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