eb2f66fa-1c64-49af-b9e8-ce3124ce3c03 eng utf8 dataset dataset NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom polardatacentre@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact 2022-10-06 ISO 19115 Geographic Information - Metadata ISO 19115:2003(E) European Petroleum Survey Group (EPSG) Geodetic Parameter Registry 2008-11-12 publication European Petroleum Survey Group EPSGadministrator@iogp.org https://www.epsg-registry.org/ EPSG Geodetic Parameter Dataset The EPSG Geodetic Parameter Dataset is a structured dataset of Coordinate Reference Systems and Coordinate Transformations, accessible through this online registry. information publisher urn:ogc:def:crs:EPSG::3031 6.18.3 Autosub Long Range beneath Ronne Ice Shelf (2018): hydrographic, velocity and turbulence observations along the Modified Warm Deep Water Inflow 2022-10-06 creation 2022-10-06 revision 2022-10-06 publication 2022-10-06 released 1.0 https://doi.org/10.5285/eb2f66fa-1c64-49af-b9e8-ce3124ce3c03 doi GB/NERC/BAS/PDC/01672 https://data.bas.ac.uk/ NE/L013770/1 award Please cite this item as: Davis, P., & Jenkins, A. (2022). Autosub Long Range beneath Ronne Ice Shelf (2018): hydrographic, velocity and turbulence observations along the Modified Warm Deep Water Inflow (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/eb2f66fa-1c64-49af-b9e8-ce3124ce3c03 Autosub Long Range (ALR) was deployed along the Modified Warm Deep Water Inflow beneath Ronne Ice Shelf in February 2018 as part of the Ice shelves in a warming world: Filchner Ice Shelf system large grant, Antarctica. The vehicle was equipped with a Seabird Conductivity-Temperature-Depth (CTD) sensor, two Teledyne Acoustic Doppler Current Profilers (ADCPs), one upward looking and one downward looking, and a nose-mounted Rockland Scientific International MicroRider turbulence package. ALR followed a rhumb line course beneath the ice shelf, running approximately parallel to the 400 m isobath. The vehicle alternated between stretches of bottom tracking and top tracking in a square-wave pattern, while maintaining a minimum clearance of 80 m between the vehicle and the ice base or seabed. Funding was provided by the UK Natural Environment Research Council Large Grant Ice shelves in a warming world: Filchner Ice Shelf system, Antarctica (Grant No. NE/L013770/1). No credit. completed Davis, Peter E.D. British Antarctic Survey Researcher author Jenkins, Adrian Northumbria University Researcher author NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact asNeeded completed EARTH SCIENCE > Oceans > Ocean Acoustics > Acoustic Velocity EARTH SCIENCE > Oceans > Ocean Circulation > Turbulence EARTH SCIENCE > Oceans > Ocean Temperature > Water Temperature EARTH SCIENCE > Oceans > Marine Environment Monitoring theme Global Change Master Directory (GCMD) Science Keywords 2026-01-27 publication 23 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) Greenbelt MD United States of America https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher Antarctica Autosub Long Range Hydrography Ronne Ice Shelf Turbulence Velocity theme Ronne Ice Shelf Antarctica place Oceanographic geographical features theme GEMET - INSPIRE themes, version 1.0 2021-01-06 revision otherRestrictions no limitations to public access otherRestrictions no limitations license Open Government Licence v3.0 otherRestrictions Data released under Open Government Licence V3.0: otherRestrictions None. url url largerWorkCitation url url crossReference textTable eng utf8 environment oceans -53.39866 -52.62132 -76.60172 -76.47509 2018-02-09 2018-02-10 It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk. NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information distributor application/x-hdf application/netcdf bytes 8912896 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=eb2f66fa-1c64-49af-b9e8-ce3124ce3c03 WWW:LINK-1.0-http--link Get Data Download data download bytes 8912896 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=eb2f66fa-1c64-49af-b9e8-ce3124ce3c03 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: All data were collected during the PS111-expedition to the southern Weddell Sea onboard the German research icebreaker RV Polarstern. CTD Hydrographic data were collected using a Seabird SBE-52 CTD that contains a ducted, pumped conductivity-temperature channel and samples at a rate of 1 Hz. The SBE-52 was mounted towards the front of ALR with the inlet and exhaust ducts attached to a pair of ports in the vehicle's hull. ADCP Velocity data were gathered using two Teledyne RDI 300 kHz Workhorse Acoustic Doppler Current Profilers (ADCPs). Both upward and downward looking ADCPs were configured in bottom track mode with 8 m bins and used for navigation as well as current measurements. Each ADCP was set to ping once every 2 seconds, with half-second ping separation between instruments to avoid interference, and the raw velocity data were processed using 5-ping (10 second) averaging. Current velocities in the vehicle frame were calculated by subtracting the bottom track velocity from the raw upwards and downwards-looking water track velocities and were then rotated into a geographic reference frame using the vehicle's heading. Turbulence Turbulence data were sampled using a front-mounted Rockland Scientific International (RSI) MicroRider turbulence package. The RSI MicroRider package had four microstructure probes sampling at a rate of 512 Hz: two orthogonally positioned shear probes and two thermistor probes. The turbulence data were processed using standard methods in the Rockland Scientific ODAS MATLAB Library. Data collection: Seabird SBE-52 Conductivity, Temperature and Depth sensor Two Teledyne RDI 300 kHz Workhorse Acoustic Doppler Current Profilers Rockland Scientific International (RSI) MicroRider turbulence package Data quality: From the Seabird SBE-52 Conductivity, Temperature and Depth sensor, the temperature data has an accuracy of ±0.002 °C and the conductivity data has an accuracy of ±0.0003 S/m. Post-deployment, the SBE-52 was calibrated against ship-based CTD casts taken from RV Polarstern, with small corrections made to both temperature (+0.0024°C) and conductivity (+0.0002 S/m). The stated accuracy of the Teledyne RDI 300 kHz Workhorse ADCPs is 0.5% of the water velocity relative to the ADCP ± 0.5 cm/s. The stated accuracy of the shear probes in the Rockland Scientific International MicroRider turbulence package is 5%. Missing values are indicated with a value of -9999. asNeeded completed