Metadata Report for BODC Series Reference Number 1838827
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
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Problem Reports
No Problem Report Found in the Database
Data Access Policy
Open 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.
If the Information Provider does not provide a specific attribution statement, or if you are using Information from several Information Providers and multiple attributions are not practical in your product or application, you may consider using the following:
"Contains public sector information licensed under the Open Government Licence v1.0."
Narrative Documents
Teledyne RDI's Workhorse Monitor ADCP
The Workhorse Monitor acoustic doppler current profler (Teledyne RD Instruments) is a long-range and long-term self contained ADCP. It has a patented four beam signal (300, 600 or 1200 kHz) and a standard depth rating of 200m or 600m. It operates effectively between temperatures of -5°C and 45°C and has a velocity accuracy of ±1% ±5mm/s.
DY053 LADCP Originator's Processing
Sampling Strategy
The following information contains extracts of the DY053 cruise report.
Full water column velocity profiles were collected as part of cruise DY053 between 26 June 2016 and 23 July 2016. The profiles were collected using two Teledyne RDI dual 300 kHz Workhorse master/slave configuration ADCPs. The primary downward-looking ADCP was serial number 13399 and the primary upward-looking 300 kHz ADCP was serial number 10607. The instruments were mounted on the CTD rosette for all 49 casts.
For the first 5 casts both ADCPs followed the same configuration as the previous cruise PE399. However, after cast 5 the number of depth bins was increased to 25, the size of the bins to 10 m, the ambiguity velocy increased to 2.5 m/s, and the blanking distance changed to 8 m (upward ADCP) and 0 m (downward ADCP). Both ADCPs were configured to ping in narrowband mode every 1.5 seconds. The slave pings were synchronized to the master, with a delay of 0.55 seconds between the two. This configuration was kept for the remainder of the cruise.
During cast 9 the upward-looking ADCP was wrongly configured to act as master, resulting in the two ADCPs pinging synchronously which caused some acoustic interferences throughout this casts dataset.
Data Processing
The raw ADCP files were processed using version IX_8 (May 2012) of the M.Visbeck and A. Thurnherr MATLAB toolbox (Thurnherr, 2012). The data were submitted to BODC as 49 individual .mat files.
References
Thurnherr, A.M. (2012) How To Process LADCP Data with the LDEO Software (last updated from version IX.8).
DY053 LADCP processing undertaken by BODC
49 LADCP casts from cruise DY053 were submitted to BODC as 49 Matlab files.
The following table shows how the variables were mapped to BODC parameter codes:
Originator's Variable | Units | BODC Parameter Code | Units | Comments |
---|---|---|---|---|
dr.z | m | ADEPZZ01 | m | No unit conversion required |
dr.u | m/s | LCEWLW01 | cm/s | Unit conversion = *100 |
dr.v | m/s | LCNSLW01 | cm/s | Unit conversion = *100 |
The reformatted data were visualised using the in-house EDSERPLO software. Suspect data were marked by adding an appropriate quality control flag, and missing data by both setting the data to an appropriate value and applying a quality control flag.
Please note - the complete LADCP files (including both raw and processed files) as received from the data originator are available upon request.
Project Information
UK - Overturning in the Subpolar North Atlantic Programme (UK-OSNAP) Programme
UK-OSNAP is part of an international collaboration to establish a transoceanic observing system in the subpolar North Atlantic. The aim is to quantify and understand the Subpolar Gyre's response to local and remote forcing of mass, heat and freshwater fluxes, within the conceptual framework of the Atlantic Meridional Overturning Circulation (AMOC).
UK-OSNAP is developing a new observing system to provide a continuous record of full-depth, trans-basin mass, heat, and freshwater fluxes. Combining these sustained measurements with innovative modelling techniques will enable the project to characterise the circulation and fluxes of the North Atlantic Subpolar Gyre.
UK-OSNAP is funded by the Natural Environment Research Council (NERC). The project is led by the National Oceanography Centre (NOC) with partners in the University of Liverpool, the University of Oxford and the Scottish Association for Marine Science (SAMS). It is a part of international OSNAP that is led by USA and includes 10 further partner groups in Canada, France, Germany, the Netherlands and China. The project involves fieldwork at sea and model studies.
The OSNAP observing system consists of two legs: one extending from southern Labrador to the southwestern tip of Greenland across the mouth of the Labrador Sea (OSNAP West), and the second from the southeastern tip of Greenland to Scotland (OSNAP East). The observing system also includes subsurface floats (OSNAP Floats) in order to trace the pathways of overflow waters in the basin and to assess the connectivity of currents crossing the OSNAP line.
NERC have added an extension to UK-OSNAP, until October 2024. This will result in the UK-OSNAP-Decade: 10 years of observing and understanding the overturning circulation in the subpolar North Atlantic (2014-2024).
Data Activity or Cruise Information
Cruise
Cruise Name | DY053 |
Departure Date | 2016-06-29 |
Arrival Date | 2016-07-22 |
Principal Scientist(s) | Stuart A Cunningham (Scottish Association for Marine 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
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 |