Metadata Report for BODC Series Reference Number 665179

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	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	ADP26225
BODC Series Reference	665179

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm)	2002-05-13 23:01
End Time (yyyy-mm-dd hh:mm)	2002-05-14 03:57
Nominal Cycle Interval	120.0 seconds

Spatial Co-ordinates

Southernmost Latitude	62.99220 N ( 62° 59.5' N )
Northernmost Latitude	63.41500 N ( 63° 24.9' N )
Westernmost Longitude	37.14520 W ( 37° 8.7' W )
Easternmost Longitude	36.68650 W ( 36° 41.2' W )
Positional Uncertainty	0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth	14.0 m
Maximum Sensor or Sampling Depth	410.0 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 CODE	Rank	Units	Title
DBINAA01	0	Metres	Depth (spatial coordinate) of ADCP bin relative to water surface {bin depth} in the water body
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
ALATZZ01	1	Degrees	Latitude north
ALONZZ01	1	Degrees	Longitude east
DSRNGR01	1	Kilometres	Distance travelled by ADCP bottom tracking refined using GPS fixes
ACBSA150	2	Decibels	Acoustic backscatter (absolute) in the water body by 150kHz broadband acoustic doppler current profiler (ADCP) and calibration using protocols of Deines (1999)
PCGDAP01	2	Percent	Acceptable proportion of acoustic signal returns {percent good} from the water body 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 262 150kHz VMADCP - MVBS

Deployment and originator's processing

Two RDI Vessel-Mounted Acoustic Doppler Current Profilers (VM-ADCPs) were operated on Discovery 262; 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)	8
Blanking distance (m)	8

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

BODC processing

A total of 36 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. No significant problems were detected.

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