Full Record - Water column and ice thickness measurements of the Filchner-Ronne Ice Shelf derived from point seismic observations collected between 2015-2017

Water column and ice thickness measurements of the Filchner-Ronne Ice Shelf derived from point seismic observations collected between 2015-2017

GB/NERC/BAS/PDC/01070

Abstract:
This data are derived from single point seismic data collected across the Filchner-Ronne Ice Shelf. The seismic data were collected over the course of three seasons by a number of field parties, consisting of two main surveys between the 15/16 and 16/17 austral summers and several smaller surveys, as part of a joint initiative between the British Antarctic Survey (BAS) and the Alfred-Wegener-Institute (AWI) in the framework of the "Filchner Ice Shelf System" (FISS) and the "Filchner Ice Shelf Project" (FISP). A total of 256 point seismic measurements were made, of which 248 had clearly visible reflectors and were deemed usable. Each data point consists of a location, together with measurements of ice thickness and water column thickness.

These data were collected as part of the FISS NERC large grant, project number NE/L013770/1.

Citation:
Rosier, S., Hofstede, C., Brisbourne, A., Hattermann, T., Davis, P., Anker, P., Gudmundsson, H., & Hugh, C. (2018). Water column and ice thickness measurements of the Filchner-Ronne Ice Shelf derived from point seismic observations collected between 2015-2017 (Version None) [Data set]. Polar Data Centre, Natural Environment Research Council, UK. https://doi.org/10.5285/dada63fb-c40a-4b13-97ba-c53860881d79

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https://ramadda.data.bas.ac.uk/repository/entry/show/?entryid=dada63fb-c40a-4b13-97ba-c53860881d79

License

Access:	No restrictions apply.
Use:	This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.

Authors

Name	UK PDC
Role(s)	Metadata Author
Organisation	British Antarctic Survey

Name	Dr Sebastian Rosier
Role(s)	Investigator, Technical Contact
Organisation	British Antarctic Survey

Name	Dr Alexander M Brisbourne
Role(s)	Investigator
Organisation	British Antarctic Survey

Name	Mr Hugh Corr
Role(s)	Investigator
Organisation	British Antarctic Survey

Name	Dr G. Hilmar Gudmundsson
Role(s)	Investigator
Organisation	Northumbria University

Name	Mr Paul Anker
Role(s)	Investigator
Organisation	British Antarctic Survey

Name	Dr Peter Davis
Role(s)	Investigator
Organisation	British Antarctic Survey

Name	Dr Tore Hattermann
Role(s)	Investigator
Organisation	AWI

Name	Dr Coen Hofstede
Role(s)	Investigator
Organisation	AWI

Basic Information

Creation Date:	2018-03-05
Dataset Progress:	Complete
Dataset Language:	English
ISO Topic Categories:	Climatology/Meteorology/Atmosphere Environment
Parameters:	Cryosphere > Glaciers/Ice Sheets > Glacier Thickness/Ice Sheet Thickness Cryosphere > Glaciers/Ice Sheets > Glaciers Cryosphere > Glaciers/Ice Sheets > Ice Sheets

Additional Information

Reference:	Rosier, Sebastian H.R.; Hofstede, C.; Brisbourne, Alex M.; Hattermann, T.; Nicholls, Keith W.; Davis, Peter E.D.; Anker, Paul G.D.; Hillenbrand, Claus-Dieter; Smith, Andy M.; Corr, Hugh F.J.. 2018 A new bathymetry for the southeastern Filchner-Ronne Ice Shelf: implications for modern oceanographic processes and glacial history. Journal of Geophysical Research: Oceans. https://doi.org/10.1029/2018JC013982
Quality:	Water column thickness and Ice thickness errors, arising from uncertainty in seismic velocities, temperature and reflector shape, are expected to be less than 10m. A detailed description of the expected errors can be found in the referenced publication.
Lineage/Methodology:	A powered auger was used to drill shot holes of ~5m depth, which were then loaded with 150-300g of high explosives. From each shot hole, a line of 24 receivers were buried to a shallow and consistent depth to ensure good coupling with the snow and reduce wind noise. Receivers were spaced at 10m intervals, with the first receiver offset from the shot hole by 30m. The shot hole was backfilled and a seismic timer was used to detonate the explosives and simultaneously trigger the seismograph. A 24 channel Geometrics Geode data logger was used with a 0.25ms sampling interval and total record length of 4096ms. Data were processed in REFLEX, to pick ice-water and water-seabed reflectors. Any sites in which only one clear reflector could be distinguished were not included in the final dataset. A detailed methodology is given in the referenced publication.

Extent

Temporal Coverage:
Start Date	2014-10-01
End Date	2017-03-31

Spatial Coverage:
Latitude
Southernmost	-83.3484
Northernmost	-80.0477
Longitude
Westernmost	-60.6003
Easternmost	-39.8342
Altitude
Min Altitude	N/A
Max Altitude	N/A
Depth
Min Depth	-828.2m
Max Depth	-1954.2m

Location:
Location	Antarctica
Detailed Location	Filchner and Ronne Ice Shelves

Instrumentation

Data Collection:	24 Channel Geometrics geode data logger used. Processed with Reflexw 7.2.3 software. Analysed in Matlab 2017a.

Storage

Distribution:
Distribution Media	Online Internet (HTTP)
Distribution Size	30KB
Distribution Format	netCDF
Fees	N/A

Data Storage:	Data is in netcdf format, and each netcdf file contains 4 variables, with the following names: 'Latitude' (decimal degrees, WGS84 - EPSG:4326), 'Longitude'(decimal degrees, WGS84 - EPSG:4326), 'Ice_thickness' (metres), 'Water_column_thickness' (metres). Netcdf files were created in matlab using the native 'nccreate' and 'ncwrite' functions, which produce files in netcdf4_classic with double type accuracy. As an example, in order to read in the ice thickness variable into MATLAB, enter the command: lat = ncread('FISS_Seismic_data.nc','Latitude');