Metadata Report for BODC Series Reference Number 662760


Metadata Summary

Data Description

Data Category Currents -subsurface Eulerian
Instrument Type Acoustic doppler current profiler
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator -
Originating Organization Southampton Oceanography Centre (now National Oceanography Centre, Southampton)
Processing Status QC in progress
Project(s) Marine Productivity
 

Data Identifiers

Originator's Identifier W15071
BODC Series Reference 662760
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2002-11-15 11:26
End Time (yyyy-mm-dd hh:mm) 2002-11-15 12:23
Nominal Cycle Interval 1.04 seconds
 

Spatial Co-ordinates

Latitude 61.67611 N ( 61° 40.6' N )
Longitude 27.00296 W ( 27° 0.2' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor Depth 9.56 m
Maximum Sensor Depth 629.27 m
Minimum Sensor Height -
Maximum Sensor Height -
Sea Floor Depth -
Sensor Distribution Variable common depth - All sensors are grouped effectively at the same depth, but this depth varies significantly during the series
Sensor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum -
 

Parameters

BODC CODE Rank Units Short Title Title
DISTTRAN 0 Metres Tran_dist Distance (from transducer along measurement axis)
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)
ACYCAA01 1 Dimensionless Record_No Sequence number
PRESPR01 1 Decibars Pres_Z Pressure (spatial co-ordinate) exerted by the water body by profiling pressure sensor and corrected to read zero at sea level
ACBSA300 2 Decibels Sv_300kHz Acoustic backscatter (absolute) in the water body by 300kHz broadband acoustic doppler current profiler (ADCP) and calibration using protocols of Deines (1999)
 

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 267 300khz Lowered ADCP (LADCP) - Deployment and Data Processing

Originator's Processing

Absolute backscatter coefficient was calculated by the method of Deines (1990). The coefficients used are listed in the table below.

Coefficient  
Alpha 0.069
C -148.2
PdbW 15.4
Rayliegh distance 2.64

The LADCP was deployed at the stations listed in the following table

Station No. Status Comments
15071 Processed  
15082 Processed  
15085 Processed  
15095 Processed  
15100 Processed  
15109 Processed Suspect profile
15113 Processed  
15121 Processed  
15171 Processed  

BODC Processing

A total of 9 station files were submitted to BODC. The data were supplied in Matlab binary format. The following variables were transferred to BODC QXF format. A large number of additional variables, including CTD and navigation data, were also present in the files. These were not transferred.

Description Units Originator's variable
Pressure Decibars d.z
Absolute backscatter (MVBS) Decibels d.mvbs
Distance from transducer Metres d.zd

Screening and Data quality

The data have been visually screened for obvious problems using the BODC EDSERPLO software. No significant problems were detected.

References

RDI, (1990). Calculating Absolute Backscatter. Technical bulletin ADCP-90-04, R D Instruments, San Diego, CA, USA.

RRS Discovery 267 300khz Lowered ADCP (LADCP) - Absolute backscatter - Instrument Setup

The instrument setup is listed in the following table.

Frequency of instrument (kHz) 300
Number of bins: 16
Beam angle 20.0
Number of pings per ensemble 1
Bin length (cm) 1000
Blank before transmit (cm) 500

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 D267
Departure Date 2002-11-06
Arrival Date 2002-12-19
Principal Scientist(s)John T Allen (Southampton Oceanography Centre), Steven J Hay (Fisheries Research Services Aberdeen 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