10.7280/D11Q17
Millan, Romain
University of California, Irvine
Ice thickness and bed elevation of the Patagonian Icefields
Dryad
dataset
2019
2019-02-20T18:19:08Z
2019-02-20T18:19:08Z
en
6352227 bytes
3
Creative Commons Attribution 4.0 International (CC BY 4.0)
We combine airborne gravity data collected inĀ 2012 and 2016, with WISE
and CECs radar sounder data from 2014 and 2015 to map bed elevation and
ice thickness accross the Northern and Southern Patagonian Icefields. We
perform a three dimensional inversion of the gravity field constrained by
radar-derived thickness, ice boundary, and fjord bathymetry to infer bed
elevation at 500-m spacing, with a precision of about 50 m. The enclosed
netCDF contains the following fields: - X: x UTM coordinate (meters) -Y: y
UTM coordinate (meters) -bed: bedrock elevation (meters) -misfit: Misfit
after inversion (calculated minus observed gravity) -misfitm: Converted
misfit using a conversion factor of 5.8 mGal per 100m -Source: Data
source, 0=bathymetry , 1=gravity, 2=radar depth sounder -Fulthick:
Comprehensive Ice thickness calculated using gravity inversion inside the
survey domain and Carrivick 2016 modified outside. The projection is given
as: "PROJCS[\"WGS 84 / UTM zone 18S\",GEOGCS[\"WGS
84\",DATUM[\"WGS_1984\",SPHEROID[\"WGS
84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY[\"EPSG\",\"6326\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],AUTHORITY[\"EPSG\",\"4326\"]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"latitude_of_origin\",0],PARAMETER[\"central_meridian\",-75],PARAMETER[\"scale_factor\",0.9996],PARAMETER[\"false_easting\",500000],PARAMETER[\"false_northing\",10000000],UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]],AXIS[\"Easting\",EAST],AXIS[\"Northing\",NORTH],AUTHORITY[\"EPSG\",\"32718\"]]" ;