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Metadata Report for BODC Series Reference Number 529939

Metadata Summary

Data Description

Data Category Towed STD/CTD
Instrument Type CTD in towed or autonomous underwater vehicle
Instrument Mounting towed unmanned submersible
Originating Country Spain
Originator -
Originating Organization Spanish Oceanography Institute, Madrid
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) OMEX II-II

Data Identifiers

Originator's Identifier UOR82.TH1099
BODC Series Reference 529939

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1999-10-19 01:35
End Time (yyyy-mm-dd hh:mm) 1999-10-19 04:21
Nominal Cycle Interval 4.0 seconds

Spatial Co-ordinates

Start Latitude 43.00050 N ( 43° 0.0' N )
End Latitude 42.99620 N ( 42° 59.8' N )
Start Longitude 10.00790 W ( 10° 0.5' W )
End Longitude 9.50950 W ( 9° 30.6' W )
Positional Uncertainty Unspecified
Minimum Sensor or Sampling Depth -
Maximum Sensor or Sampling Depth -
Minimum Sensor or Sampling Height -
Maximum Sensor or Sampling Height -
Sea Floor Depth -
Sea Floor Depth Source -
Sensor or Sampling Distribution -
Sensor or Sampling Depth Datum -
Sea Floor Depth Datum -


BODC CODERankUnitsTitle
AADYAA011DaysDate (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ011DaysTime (time between 00:00 UT and timestamp)
ACYCAA011DimensionlessSequence number
ALATZZ011DegreesLatitude north
ALONZZ011DegreesLongitude east
CPHLPR011Milligrams per cubic metreConcentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >unknown phase] by in-situ chlorophyll fluorometer
LVLTPD011VoltsRaw signal (voltage) of instrument output by PML/Chelsea Instruments 2-pi PAR downwelling light meter
PRESPR011DecibarsPressure (spatial coordinate) exerted by the water body by profiling pressure sensor and correction to read zero at sea level
PSALST011DimensionlessPractical salinity of the water body by CTD and computation using UNESCO 1983 algorithm
TEMPST011Degrees CelsiusTemperature of the water body by CTD or STD

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

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

RV Thalassa TH1099 UOR Deployments

UOR data were collected on a series of tows between stations on the OMEX99 Thalassa cruise as follows:

Start End
Tow Time Latitude Longitude Time Latitude Longitude
Tow_S 14/10/99 18:01 42.1500 -10.0000 15/10/99 05:19 42.1500 -8.9501
Tow5 16/10/99 08:31 42.1488 -9.1393 16/10/99 14:21 42.6630 -9.9938
Tow61 17/10/99 22:10 42.6667 -9.1792 18/10/99 02:28 42.6661 -9.9977
Tow62 18/10/99 02:28 42.6661 -9.9976 18/10/99 06:44 42.6681 -9.2203
Tow7 18/10/99 08:45 42.6771 -9.2221 18/10/99 13:37 42.9978 -10.0094
Tow81 18/10/99 22:45 43.0027 -9.5200 19/10/99 01:35 43.0004 -10.0079
Tow82 19/10/99 01:35 43.0005 -10.0079 19/10/99 04:21 42.9962 -9.5095

UOR Data Processing


The towed instrument was a standard Chelsea Instruments fish equipped with an Aquapak CTD, an Aquatracka fluorometer and a PAR sensor.

Data Processing

The data were supplied to BODC as ASCII files with pressure, temperature, salinity and chlorophyll calibrated into engineering units together with the PAR sensor output as a voltage.

The standard manufacturer's calibrations had been applied from a calibration file dated October 1996. Navigation had been added by linear interpolation between the positions at the start and the end of each tow.

The data were converted into BODC internal format (PXF) and screened on a graphics workstation. Spikes in the data were flagged as suspect. In addition, 'B' and 'E' flags (beginning and end) were applied to the pressure channel to delimit the individual up and down cast profiles.

No attempt has been made to intercalibrate the UOR data with sample data or with data from other instruments. The absolute accuracy of the data is therefore unknown. No calibration to convert light meter voltage into engineering units was available.

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


Cruise Name TH1099
Departure Date 1999-10-13
Arrival Date 1999-10-20
Principal Scientist(s)Manuel Varela (Spanish Institute of Oceanography, La Coruna Oceanographic Centre)
Ship Thalassa

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