Metadata Report for BODC Series Reference Number 1839799
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
LADCP data from cruise JR17001 Quality Report
Screening and Quality Control
During BODC quality control, data were screened using in house visualisation software. The data were screened where any obvious outliers were looked at in closer detail but it was not deemed that any points were anomalous.
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
RD Instruments 300kHz Workhorse Sentinel Acoustic Doppler Current Profiler
Specifications
| Water velocity measurements relative to the ADCP | |
|---|---|
| Maximum velocity | 10 m.s-1 |
| Standard deviation | 130, 45, 25, 12, 5 mm.s-1 for depth cell sizes of 1, 2, 4, 8, 16 m, respectively |
| Minimum time between pings | 0.07 s |
| Maximum profiling range* | 110, 120, 130, 150, 165 m for depth cell sizes of 1, 2, 4, 8, 16 m, respectively |
| Minimum range to start of first depth cell | 3 m |
| Number of depth cells | 1 - 128 cells |
| Depth cell size | 1 - 16 cm |
| Echo Intensity measurements | |
| Uncertainty | ± 1.5 dB |
| Sampling | Uses same depth cells and time intervals as velocity |
| Sensors | |
| Water level resolution | 0.25 m |
| Water level accuracy | ± 5 m over 0-200 m depth |
| Temperature range | -5°C to + 45°C |
| Temperature uncertainty | ± 0.4°C |
| Tilt range | ± 20° |
| Tilt uncertainty | ± 2° |
| Compass uncertainty | ± 5° at 60° magnetic dip angle |
| Compass maximum tilt | 20° |
| Physical and Environmental | |
| Maximum depth | 200 m |
| Operating temperature | -5°C to 60°C |
| Storage Temperature | -5°C to 80°C |
The manufacturer's specification document can be found here
Instrument Description for JR17001 CTD
CTD Unit and Auxiliary Sensors
The CTD unit comprised a Sea-Bird Electronics (SBE) 9plus underwater unit, an SBE 11 plus deck unit, a 24-way SBE 32 carousel and 24 Niskin bottles; all of which were mounted on a stainless steel 24-way CTD frame. Attached to the CTD were two SBE 3P temperature sensors, two SBE 4C conductivity sensors, one SBE 43 dissolved oxygen sensor, one QCP2350 PAR sensor, one CTG Aquatracka MKIII fluorometer, one WetLabs C-Star transmissometer, one Tritech Altimeter, one SBE35 temperature sensor and a RDI LADCP.
| Sensor unit | Model | Serial number | Full specification |
|---|---|---|---|
| CTD underwater unit | SBE 9plus | 0707 | SBE 9plus |
| CTD deck unit | SBE 11plus | 0458 | - |
| Carousel | SBE 32 - 24 Position Pylon | 0636 | SBE 32 |
| Temperature sensor | SBE 3P | 2705 | SBE 03P |
| Temperature sensor | SBE 3P | 5042 | SBE 03P |
| Conductivity sensor | SBE 4C | 3488 | SBE 04C |
| Conductivity sensor | SBE 4C | 2248* | SBE 04C |
| Dissolved oxygen sensor | SBE 43 | 0242 | SBE 43 |
| Altimeter | Tritech PA-200 | 10127 | Tritech PA-200 |
| Irradiance sensor | Biospherical QCP2350 PAR | 70636 | Biospherical QCP PAR sensor |
| Fluorometer | Chelsea MKIII Aquatracka | 09-7324-001 | Chelsea MKII Aquatracka |
| Transmissometer | WetLabs C-Star | 396 | WetLabs C-Star |
| Temperature sensor (Independent) | SBE 35 | 0024 | SBE 35 |
| LADCP | RDI Workhorse 300 kHz | 15060** | LADCP |
* The secondary conductivity sensor was replaced during the cruise due to the output of the first sensor being spikey. The serial number of the first sensor was 2248 and the serial number of the second sensor was 2255.
** The LADCP was replaced during the cruise due to excessive file fragmentation. The LADCP was replaced by RDI Workhorse 300 kHz serial number 14897.
BODC Data Processing of LADCP data from cruise JR17001
Data Processing
The LADCP data from cruise JR17001 were processed and submitted to BODC in .mat format. The files were subsequently archived and transferred to BODC internal format using standard BODC procedures. The variables provided in the files were mapped to BODC parameter codes as follows:
| Originator's Variable | Originator's Units | BODC Parameter Code | BODC Units | Comment |
|---|---|---|---|---|
| dr.z | m | ADEPZZ01 | m | - |
| dr.u | m s-1 | LCEWLW01 | cm s-1 | Conversion of *100 applied. |
| dr.v | m s-1 | LCNSLW01 | cm s-1 | Conversion of *100 applied. |
Screening
Post transfer analysis and crosschecks were applied according to BODC procedures. This involved the screening of data using BODC's in house visualisation software where any anomalous data were flagged but not removed.
Originator Data Processing of LADCP data from cruise JR17001
Sampling Strategy
A total of 44 LADCP casts were performed during JR17001 with 34 of these casts completed as part of the ORCHESTRA programme and the remaining 10 casts completed for the NERC-CONICYT ICEBERGS programme. 20 of the ORCHESTRA casts surveyed the SR1b line. A 330 kHz Workhorse lowered acoustic Doppler current profiler (LADCP) was fitted in a downward looking position on the CTD rosette for all casts. The LADCP was configured to sample in 25 x 8 m bins and data were collected in beam coordinates and rotated to earth coordinates during data processing.
Data Processing
The LADCP was connected to a charger and to the CTD computer via a serial cable. Using the CTD computer, programming prior to each station was completed and the data were downloaded after each cast. This was done using BBTalk. The downloaded data were then copied to the network data drive and processed with the LDEO IX software. During processing, the ship's navigation file and CTD pressure streams were incorporated to constrain the solution for earth-relative velocity from the measured instrument-relative velocity.
Further information on the LADCP processing can be found in sections 12.2.5 and 15.3. b) of the cruise report.
Data Submission
Data from 42 of the 44 casts were submitted to BODC.
Project Information
Impacts of deglaciation on benthic marine ecosystems in Antarctica
Impacts of deglaciation on benthic marine ecosystems in Antarctica (ICEBERGS) is one of three NERC-CONICYT joint funded projects running from 2017 to 2021. The aim of the programme is to investigate the impacts of physical disturbance arising from climate-warming induced deglaciation on benthic communities around the West Antarctic Peninsula.
Participants
There are four research institutions involved in the project:
- University of Bangor
- University of Exeter
- Universidad Católica de la Santísima Concepción
- British Antarctic Survey (BAS)
Research Details
In order to meet the aim of the project, the ICEBERGS consortium produced six objectives:
- Monitoring glacier retreat over time and scour intensity on the adjacent seabed.
- Determine the benthic assemblage structure from localities with different perturbation levels.
- Evaluate nutritional and reproductive conditions of adults.
- Analyse growth rates from bivalve/gastropod shells and bryozoan populations with different perturbation levels.
- Develop reconstructions of physical disturbance due to iceberg discharge from growth patterns present in the carbonate structure of the shells of marine molluscs.
- Estimate the effect of marine glacier discharge and iceberg scouring on the genetic diversity and connectivity of marine invertebrate populations and the role of dispersal potential.
Fieldwork and Data Collection
The fieldwork for the project consists of research cruises along the west Antarctic Peninsula across three field seasons on board the RRS James Clark Ross. Three sites (Marine Cove, William Glacier and Sheldon Glacier) were selected for the fieldwork using available bathymetry and glacier retreat data. The fieldwork covers physical oceanography, marine geology, habitat mapping, community structure and seabed sediments and consists of CTD deployments, multi-beam swath bathymetry surveys, TOPAS sub-bottom profiling, shallow underwater camera system deployments, plankton net deployments, Agassiz trawls, Hamon grabs and multi-corer deployments.
Data Activity or Cruise Information
Cruise
| Cruise Name | JR17001 (ORCHESTRA) |
| Departure Date | 2017-11-21 |
| Arrival Date | 2017-12-21 |
| Principal Scientist(s) | David Barnes (British Antarctic Survey), J Alexander Brearley (British Antarctic Survey), Yvonne L Firing (National Oceanography Centre, Southampton) |
| Ship | RRS James Clark Ross |
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 |
