Metadata Report for BODC Series Reference Number 1795008
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
RRS James Clark Ross JR16002 Lowered Acoustic Doppler Current Profiler (LADCP): Data Quality Report
Series reference 1794957, LADCP profile number 26 has, according to the originator's comments, an erroneous surface layer segment, velocity data values have been flagged M for the first 200m.
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
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
RRS James Clark Ross JR16002 Lowered Acoustic Doppler Current Profiler (LADCP): BODC Processing Document
LADCP processed data were provided by the originator in Matlab and ascii formats. The LDEO processed data in ASCII format were converted into BODC internal format after discussion with the originator. The following table shows how the variables within the ASCII files were mapped to appropriate BODC parameter codes:
| Originator's Parameter Name | Units | Description | BODC Parameter Code | Units | Comments |
|---|---|---|---|---|---|
| z | m | Depth of LADCP bin | ADEPZZ01 | m | - |
| u | m s-1 | Eastward velocity | LCEWLW01 | cm s-1 | Units converted by * 100 |
| v | m s-1 | Northward velocity | LCNSLW01 | cm s-1 | Units converted by * 100 |
All reformatted data were visualised and screened using the in-house Edserplo software. Suspect data were marked by adding an appropriate quality control flag.
Please note that the more complex LDEO processed data are available on request in Matlab format, this also applies to unprocessed raw LADCP files.
RRS James Clark Ross JR16002 Lowered Acoustic Doppler Current Profiler (LADCP): Originators Processing Document
Sampling Strategy
Lowered Acoustic Doppler Current Profiler (LADCP) data were collected on-board cruise JR16002. The LADCP was installed in a downward looking configuration of the CTD rosette. A total of 31 CTD/LADCPs deployed, the included 30 station casts and one test cast deployment.
Data processing
Data for each station were processed on fola using the LDEO-IX software package, developed at Lamont-Doherty Earth Observatory (LDEO). The software uses an inverse method to calculate velocity profiles, optionally including LADCP bottom tracking and/or VMADCP upper ocean velocities as constraints.
Processing completed at-sea was performed using only ship navigation or navigation and bottom tracking. Data were downloaded after each cast and stored as RDI binary files.
A script was run to export metadata such as time, lat, lon, press, temp, psal into ASCII to be used by the LDEO processing. While the LADCP processing can be run without the CTD data, position from the CTD file is used to compute the magnetic deviation.
The different versions of set cast params*.m are called by different versions of process cast*.m to run IX processing of the LADCP data with different constraints:
- Process cast v5.m calls set cast params v5.m to include only navigation data
- process cast v4.m calls set cast params v4.m to include navigation and bottom tracking data
Please refer to JR16002 cruise report for a more detailed LADCP processing methodology.
References
Firing, Y. L., 2017.RRS James Clark Ross Cruise JR16002, 10 Nov - 03 Dec 2016. Hydrographic measurements on GO-SHIP line SR1b.Southampton, UK: National Oceanography Centre, Southampton, 43pp. (National Oceanography Centre Cruise Report, No. 41.
Project Information
Ocean Regulation of Climate by Heat and Carbon Sequestration and Transports (ORCHESTRA)
The Ocean Regulation of Climate by Heat and Carbon Sequestration and Transports (ORCHESTRA) is a £8.4 million, five year (2016-2021) research programme funded by the Natural Environment Research Council (NERC). The aim of the research is to to advance the understanding of, and capability to predict, the Southern Ocean's impact on climate change via its uptake and storage of heat and carbon. The programme will significantly reduce uncertainties concerning how this uptake and storage by the ocean influences global climate, by conducting a series of unique fieldwork campaigns and innovative model developments.
Background
ORCHESTRA represents the first fully-unified activity by NERC institutes to address these challenges, and will draw in national and international partners to provide community coherence, and to build a legacy in knowledge and capability that will transcend the timescale of the programme itself.
It brings together science teams from six UK research institutions to investigate the role that the Southern Ocean plays in our changing climate and atmospheric carbon draw-down. It is led by British Antarctic Survey, in partnership with National Oceanography Centre, British Geological Survey, Plymouth Marine Laboratory, the Centre for Polar Observation and Modelling and the Sea Mammal Research Unit.
The oceans around Antarctica play a critical a key role in drawing down and storing large amounts of carbon and vast quantities of heat from from the atmosphere. Due to its remoteness and harsh environment, the Southern Ocean is the world's biggest data desert, and one of the hardest places to get right in climate models. The ORCHESTRA programme will make unique and important new measurements in the Southern Ocean using a range of techniques, including use of the world-class UK research vessel fleet, and deployments of innovative underwater robots. The new understanding obtained will guide key improvements to the current generation of computer models, and will enhance greatly our ability to predict climate into the future.
The scope of the programme includes interaction of the Southern Ocean with the atmosphere, exchange between the upper ocean mixed layer and the interior and exchange between the Southern Ocean and the global ocean.
Further details are available on the ORCHESTRA page.
Participants
Six different organisations are directly involved in research for ORCHESTRA. These institutions are:
- British Antarctic Survey (BAS)
- National Oceanography Centre (NOC)
- Plymouth Marine Laboratory (PML)
- British Geological Survey (BGS)
- Centre for Polar Observation and Modelling (CPOM)
- Sea Mammal Research Unit (SMRU)
GO-SHIP are a third party organisation that, although not directly involved with the programme, will conduct ship based observations that will also be used by ORCHESTRA.
Research details
Three Work Packages have been funded by the ORCHESTRA programme. These are described in brief below:
-
Work Package 1: Interaction of the Southern ocean with the atmosphere
WP1 will use new observations of surface fluxes and their controlling parameters in order to better constrain the exchanges of heat and carbon loss across the surface of the Southern Ocean. -
Work Package 2: Exchange between the upper ocean mixed layer and the interior.
This work package will combine observationally-derived data and model simulations to determine and understand the exchanges between the ocean mixed layer and its interior. -
Work Package 3: Exchange between the Southern Ocean and the global ocean .
This WP will use budget analyses of the hydrographic/tracer sections to diagnose the three-dimensional velocity field of the waters entering, leaving and recirculating within the Southern Atlantic sector of the Southern ocean. -
Fieldwork and data collection
The campaign consists of 12 core cruises on board the NERC research vessels RRS James Clark Ross and RRS James Cook and will include hydrographic/tracer sections conducted across Drake Passage (SR1b), the northern Weddell Sea/Scotia Sea (A23), the northern rim of the Weddell Gyre (ANDREXII) and across the South Atlantic (24S). Section I6S will be performed by GO-SHIP Project Partners. Measurements will include temperature, salinity, dissolved oxygen, velocity, dissolved inorganic carbon, total alkalinity, inorganic nutrients, oxygen and carbon isotopes, and underway meteorological and surface ocean observations including pCO2.
Tags will be deployed on 30 Weddel seals and these will provide temperature and salinity profiles that can be used alongside the Argo data.
Autonomous underwater ocean gliders will conduct multi-month missions and will deliver data on ocean stratification, heat content, mixed layer depth and turbulent mixing over the upper 1 km, with previously-unobtainable temporal resolution. These gliders will be deployed in the Weddell Gyre and the ACC.
Field campaigns with the MASIN meteorological aircrafts will be conducted flying out of Rothera and Halley research stations and the Falkland Islands. These campaigns will deliver information on key variables relating to air-sea fluxes (surface and air temperature, wind, humidity, atmospheric CO2, radiation, turbulent fluxes of heat, momentum and CO2), in different sea ice conditions and oceanic regimes.
Eart Observation datasets will be used to inform the programme on the properties of the ocean, sea ice and atmosphere and on interactions between them.
A cluster of 6 deep ocean moorings in the Orkney Passage will collect year round series of AABW temperatre and transport. This work connects to the NERC funded project Dynamics of the Orkney Passage Outflow (DYNOPO).
The UK Earth System model (UKESM) and underlying physical model will be used to conduct analyses of heat and carbon uptake and transport by the Southern Ocean and their links to wider climate on decadal timescales.
An eddy-resolving (1/12°) sector model of the ocean south of 30°S with 75 vertical levels, will be built using the NEMO model coupled to the Los Alamos sea ice (CICE) model. The improvements on the ocean boundary layer will be based from the results from the NERC-funded OSMOSIS project and the inclusion of tides.
20-5 year runs of an adjoint model will be conducted to determine how key forcings and model states affect the uptake and subduction of heat and carbon by the ocean.
Data Activity or Cruise Information
Cruise
| Cruise Name | JR16002 |
| Departure Date | 2016-11-10 |
| Arrival Date | 2016-12-03 |
| Principal Scientist(s) | 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 |
