Metadata Report for BODC Series Reference Number 649376

Metadata Summary
Problem Reports
Data Access Policy
Narrative Documents
Project Information
Data Activity or Cruise Information
Fixed Station Information
BODC Quality Flags
SeaDataNet Quality Flags

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
Online delivery of data	Download not available
Project(s)	Marine Productivity

Data Identifiers

Originator's Identifier	B14536
BODC Series Reference	649376

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm)	2002-05-15 15:07
End Time (yyyy-mm-dd hh:mm)	2002-05-15 16:29
Nominal Cycle Interval	1.54 seconds

Spatial Co-ordinates

Latitude	64.56975 N ( 64° 34.2' N )
Longitude	34.92187 W ( 34° 55.3' W )
Positional Uncertainty	0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth	9.86 m
Maximum Sensor or Sampling Depth	1251.53 m
Minimum Sensor or Sampling Height	-
Maximum Sensor or Sampling Height	-
Sea Floor Depth	-
Sea Floor Depth Source	-
Sensor or Sampling Distribution	Variable common depth - All sensors are grouped effectively at the same depth, but this depth varies significantly during the series
Sensor or Sampling Depth Datum	Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum	-

Parameters

BODC CODE	Rank	Units	Title
DISTTRAN	0	Metres	Distance (from transducer along measurement axis)
AADYAA01	1	Days	Date (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ01	1	Days	Time (time between 00:00 UT and timestamp)
ACYCAA01	1	Dimensionless	Sequence number
PRESPR01	1	Decibars	Pressure (spatial coordinate) exerted by the water body by profiling pressure sensor and correction to read zero at sea level
ACBSA600	2	Decibels	Acoustic backscatter (absolute) in the water body by 600kHz 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 262 600khz Lowered ADCP (LADCP)- Absolute backscatter

Deployment and originators processing

The instrument setup is listed in the following table.

Frequency of instrument (kHz)	600
Number of bins:	16
Beam angle	20.0
Number of pings per ensemble	1
Bin length (cm)	800
Blank before transmit (cm)	500

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

Coefficient
Alpha	0.153
C	-141.4
PdbW	15.4
Rayliegh distance	2.9

The LADCP deployments are listed in the following table

Station No.	Status	Comments
14351	Failed
14361	Processed
14364	Processed
14388	Processed
14401	Processed
14441	Processed	Shallow(bad)
14458	Processed
14470	Failed
14486	Processed
14498	Processed
14508	Processed
14511	Processed
14517	Processed	Shallow(bad)
14523	Failed
14532	Processed
14534	Processed
14536	Processed
14544	Processed
14553	Processed	Shallow(bad)
14561	Processed	Shallow(bad)
14567	Processed
14569	Processed
14577	Processed
14584	Processed
14592	Processed
14604	Processed
14611	Processed
14616	Processed
14626	Processed
14629	Failed
14634	Processed
14644	Processed
14647	Processed
14652	Failed
14672	Processed

BODC processing

A total of 31 station files where 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	Originators 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 XERPLO software. No significant problems were detected.

References

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

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:

To identify the dominant spatial and temporal scales of physical parameters and zooplankton population dynamics, by observation, modelling and retrospective analysis
To parameterise the critical processes governing zooplankton dynamics by observations and experiments
To construct and validate spatially explicit models of zooplankton and their food and predators, capable of resolving short term changes in population structure
To provide data for model validation by developing and applying new interdisciplinary techniques to a wide spectrum of biological and physical parameters
To develop a database and information system for historic and new data and models.

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	D262
Departure Date	2002-04-18
Arrival Date	2002-05-26
Principal Scientist(s)	Kelvin Richards (University of Southampton School of Ocean and Earth Science)
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