bdfeb69c-df5c-461d-b7a8-583f9daab685 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 2021-07-02 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 Topographic Parametric Sonar (TOPAS) acoustic sub-bottom profiler data acquired on RRS James Clark Ross JR298 cruise in 2015 2021-07-02 creation 2021-07-02 revision 2021-07-02 publication 2021-07-02 released 1.0 https://doi.org/10.5285/bdfeb69c-df5c-461d-b7a8-583f9daab685 doi GB/NERC/BAS/PDC/01517 https://data.bas.ac.uk/ NE/J006548/1 award Please cite this item as: Larter, R., Hogan, K., Hillenbrand, C., & Gowland, E. (2021). Topographic Parametric Sonar (TOPAS) acoustic sub-bottom profiler data acquired on RRS James Clark Ross JR298 cruise in 2015 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/bdfeb69c-df5c-461d-b7a8-583f9daab685 We present here Topographic Parametric Sonar (TOPAS) acoustic sub-bottom profiler data acquired on RRS James Clark Ross JR298 cruise in 2015. Data are provided in SEG-Y format. This project was funded by UK Natural Environment Research Council Grant NE/J006548/1: Depositional patterns and records in sediment drifts off the Antarctic Peninsula and West Antarctica No credit. completed Larter, Robert British Antarctic Survey Researcher author Hogan, Kelly British Antarctic Survey Researcher author Hillenbrand, Claus-Dieter British Antarctic Survey Researcher author Gowland, Elanor British Antarctic Survey 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 > Solid Earth > Seismology > Seismic Profile EARTH SCIENCE > Oceans > Marine Geophysics 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 Sub-bottom profile TOPAS continental rise sediment theme Antarctic Peninsula Antarctica Bellingshausen Sea place Geology 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 Please cite this dataset as follows: Larter, R., Hogan, K., Hillenbrand, C.-D., & Gowland, E. (2021). Topographic Parametric Sonar (TOPAS) acoustic sub-bottom profiler data acquired on RRS James Clark Ross JR298 cruise in 2015 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/BDFEB69C-DF5C-461D-B7A8-583F9DAAB685 otherRestrictions None url url crossReference doi doi crossReference url url crossReference textTable eng utf8 elevation geoscientificInformation -96.0 -66.0 -70.0 -59.0 2015-02-01 2015-03-01 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/octet-stream bytes 13958643712 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=bdfeb69c-df5c-461d-b7a8-583f9daab685 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: These data were collected using a Kongsberg Simrad TOPAS PS018 acoustic sub-bottom profiler. The TOPAS system operated by transmitting a chirp pulse with a frequency band of 1.5-5kHz and length of 10 ms. The receiver had a sample rate of 20 kHz with a trace length of 400 ms, and the gain (in dB) was controlled by the sonar watchkeeper with a range of 2-15 dB and a high-pass filter of 1-2 kHz . Logging of sub-bottom profiler data began at 1514 UTC on Julian day 032, and the system was operated near-continuously during the cruise until 1208 UTC on Julian day 058 when the JCR was approaching Rothera.TOPAS was re-started at 1014 UTC on Julian day 059 and was run until a location in the Drake Passage, 200 nautical miles from the coast at the edge of Argentina's exclusive economic zone. Pinging and logging of TOPAS sub-bottom profiles was stopped for the final time at 1756 UTC on Julian day 060. Additional settings information can be found in the cruise report: https://www.bodc.ac.uk/resources/inventories/cruise_inventory/reports/jr298.pdf Data collection: Data were collected using a Kongsberg Simrad TOPAS PS018 sub-bottom profiler Data quality: A swept-frequency ("chirp") transmission pulse was used, which required the return signals to be cross-correlated with the source signature (matched filter) throughout the cruise to extract signals with a simple effective waveform, which also has the benefit of reducing random noise (see more information in the cruise report: https://www.bodc.ac.uk/resources/inventories/cruise_inventory/reports/jr298.pdf) asNeeded completed