Metadata Report for BODC Series Reference Number 665536


Metadata Summary

Data Description

Data Category Currents -subsurface Eulerian
Instrument Type Acoustic doppler current profiler
Instrument Mounting research vessel
Originating Country United Kingdom
Originator -
Originating Organization Southampton Oceanography Centre (now National Oceanography Centre, Southampton)
Processing Status QC in progress
Online delivery of data Download not available
Project(s) Marine Productivity
 

Data Identifiers

Originator's Identifier ADP26421
BODC Series Reference 665536
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2002-08-15 08:59
End Time (yyyy-mm-dd hh:mm) 2002-08-16 08:57
Nominal Cycle Interval 120.0 seconds
 

Spatial Co-ordinates

Start Latitude 64.64400 N ( 64° 38.6' N )
End Latitude 63.89060 N ( 63° 53.4' N )
Start Longitude 35.20360 W ( 35° 12.2' W )
End Longitude 37.52450 W ( 37° 31.5' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth 11.0 m
Maximum Sensor or Sampling Depth 407.0 m
Minimum Sensor or Sampling Height -
Maximum Sensor or Sampling Height -
Sea Floor Depth -
Sea Floor Depth Source -
Sensor or Sampling Distribution Sensor fixed with measurements made at multiple depths within a fixed range (e.g. ADCP) - The sensor is at a fixed depth, but measurements are made remotely from the sensor over a range of depths (e.g. ADCP measurements)
Sensor or Sampling Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum -
 

Parameters

BODC CODERankUnitsTitle
DBINAA010MetresDepth below sea surface (ADCP bin)
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
DSRNGR011KilometresDistance travelled by ADCP bottom tracking refined using GPS fixes
ACBSA1502DecibelsAcoustic backscatter (absolute) in the water body by 150kHz broadband acoustic doppler current profiler (ADCP) and calibration using protocols of Deines (1999)
PCGDAP012PercentAcceptable proportion of signal returns by acoustic doppler current profiler (ADCP)

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

RRS Discovery 264 150kHz VMADCP - MVBS

Deployment and originator's processing

Two RDI Vessel-Mounted Acoustic Doppler Current Profilers (VM-ADCPs) were operated on Discovery 264; the 150kHz VM-ADCP and the 75 kHz Phased Array instrument (Ocean Surveyor) that had been fitted immediately prior to FISHES (Discovery 253, May-June 2001). The 150 kHz ADCP is mounted in the hull 1.75 m to port of the keel, 33 m aft of the bow at the waterline and at an approximate depth of 5 m. The 75 kHz ADCP is mounted in a second well in the hull, but 4.15 m forward and 2.5 m to starboard of the 150 kHz well. The following table describes the setup of the 150kHz ADCP.

Frequency dependent constant 4.17e5
Power into water (W) 183.15
Dimensionless noise factor 8.95
Bin length (m) 4
Blanking distance (m) 4

A nominal calibration of *0.42 was applied to the raw backscatter data by the data originator.

BODC processing

A total of 32 files were submitted to BODC. The data were supplied in P* binary format. The following variables were transferred to BODC QXF format (a BODC-defined subset of NetCDF and BODC's format for 2 dimensionsal datacycle storage) using transfer process tr363. The only variables not transferred were the non-calibrated backscatter and the time channel (the latter being automatically calculated by the transfer program).

BODC Code Description Units Originator's variable
ALATZZ01 Latitude degrees lat
ALONZZ01 Longitude degrees lon
DSRNGR01 Distance Run km distrun
DBINAA01 Bin depth metres bindepth
ACBSA150 Absolute backscatter (MVBS) decibels amplcal
PCGDAP01 Percentage good returm signal % good

Screening and Data quality

The data have been visually screened for obvious problems using the BODC EDSERPLO software. The following series had no obvious problems - 665432, 665641, 665653, 665665. The remaining series contained varying numbers of out-of-range values - automatically flagged 'N' (i.e. null-data values) by the transfer. These out-of-range values were also preceeded in the series by a characteristic slope from the level of the measurements to the out-of-range value(s). The points on the slope were flagged 'M' (i.e. suspicious data values).


Project Information

Marine Productivity programme (MarProd)

The Marine Productivity programme (MarProd) was a Thematic Programme of the Natural Environment Research Council. It was funded for a period of five years starting in 2000. Its main goal was "to develop coupled modelling and observation systems for the pelagic ecosystem, with emphasis on physical factors affecting zooplankton dynamics" with the following specific objectives:

The programme was composed of two phases: Phase 1 projects (2000-2002) focused on the use of historical datasets and existing biological models, complemented by laboratory experiments and remote-sensing analyses to gain a better understanding of the dynamics of zooplankton populations in shelf seas. The main, field-based Phase 2 of the programme (2001-2005) focused on the open ocean. The fieldwork phase took place between November 2001 and December 2002 and consisted of four surveys in the northern North Atlantic in early winter 2001 and 2002, and in spring and summer 2002.

MarProd was a major UK contribution to the international Global Ocean Ecosystem Dynamics project (GLOBEC).


Data Activity or Cruise Information

Cruise

Cruise Name D264
Departure Date 2002-07-25
Arrival Date 2002-08-28
Principal Scientist(s)Andrew Brierley (Gatty Marine Laboratory)
Ship RRS Discovery

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
Q value below limit of quantification