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Metadata Report for BODC Series Reference Number 553165

Metadata Summary

Data Description

Data Category Multiple data types -fixed platform
Instrument Type Bottom Lander (miscellaneous instruments)
Instrument Mounting fixed benthic node
Originating Country Netherlands
Originator -
Originating Organization Royal Netherlands Institute for Sea Research
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) OMEX II-II

Data Identifiers

Originator's Identifier BOBO1/1
BODC Series Reference 553165

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1997-07-21 19:02
End Time (yyyy-mm-dd hh:mm) 1998-08-13 09:32
Nominal Cycle Interval 600.0 seconds

Spatial Co-ordinates

Latitude 42.63080 N ( 42° 37.8' N )
Longitude 9.99320 W ( 9° 59.6' W )
Positional Uncertainty 0.1 to 0.5 n.miles
Minimum Sensor or Sampling Depth 2149.0 m
Maximum Sensor or Sampling Depth 2151.75 m
Minimum Sensor or Sampling Height 0.25 m
Maximum Sensor or Sampling Height 3.0 m
Sea Floor Depth 2152.0 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


BODC CODERankUnitsTitle
DBINAA010MetresDepth (spatial coordinate) of ADCP bin relative to water surface {bin depth} in the water body
AADYAA011DaysDate (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ011DaysTime (time between 00:00 UT and timestamp)
PSALPR011DimensionlessPractical salinity of the water body by conductivity cell and computation using UNESCO 1983 algorithm
TEMPPR011Degrees CelsiusTemperature of the water body
TURBPR011Nephelometric Turbidity UnitsTurbidity of water in the water body by in-situ optical backscatter measurement and laboratory calibration against formazin
LCDAAP012Degrees TrueDirection (towards) of water current (Eulerian measurement) in the water body by moored acoustic doppler current profiler (ADCP) and correction to true North
LCSAAP012Centimetres per secondSpeed of water current (Eulerian measurement) in the water body by moored acoustic doppler current profiler (ADCP)
LCVSAC012Centimetres per secondVertical speed of water current in the water body by in-situ acoustic current meter

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 relative salinity values show a clear and credible signal with the exception of a few spikes. However, comparison with calibrated CTD data shows that the absolute values are approximately 1 PSU too high.

Data Access Policy

Public domain data

These data have no specific confidentiality restrictions for users. However, users must acknowledge data sources as it is not ethical to publish data without proper attribution. Any publication or other output resulting from usage of the data should include an acknowledgment.

The recommended acknowledgment is

"This study uses data from the data source/organisation/programme, provided by the British Oceanographic Data Centre and funded by the funding body."

Narrative Documents

BOBO1 Benthic Lander

The Bottom Boundary layer lander (BOBO) was developed at the Netherlands Institute for Sea Research (NIOZ) to make near-bottom measurements of currents, temperature, salinity and turbidity for periods of up to a year.

BOBO1 was equipped with a modified NE Sensortec UCM60 acoustic current meter, measuring current velocity at heights of 25, 50, 75 and 100cm above the seabed. A SeaBird SBE16 conductivity and temperature probe measured temperature and salinity 3m above the seafloor. A SeaTech 25cm path length red light transmissometer and a SeaPoint OBS sensor were mounted 1m and 2m respectively above the seabed.

Time lapse photographs were taken by a pair of Camera Alive cameras mounted 2m above the base of the lander.

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:

  • OMEX II Project Data Set (three discs)

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) 1997-07-21
End Date (yyyy-mm-dd) 1998-08-13
Organization Undertaking ActivityRoyal Netherlands Institute for Sea Research
Country of OrganizationNetherlands
Originator's Data Activity IdentifierOMX2/BOBO1/1
Platform Categoryfixed benthic node

OMEX II Lander Deployment OMEX2/BOBO1/1

Position 42.63083° N, 9.993170° W
Water depth 2152 m
Deployed 21 July 1997
from RV Pelagia cruise PLG109
Recovered 13 August 1998
from RV Pelagia cruise PLG121

Current meter failed after three days
1m transmissometer returned no data


Cruise Name PE109
Departure Date 1997-07-15
Arrival Date 1997-08-06
Principal Scientist(s)Tjeerd van Weering (Royal Netherlands Institute for Sea Research)
Ship RV Pelagia

Complete Cruise Metadata Report is available here

Fixed Station Information

No Fixed Station Information held for the Series

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