Greenland Basal Heat Flux

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title   Greenland basal heat flux
creator_name   Glen Granzow
institution   University of Montana
date_created   October 1, 2012
summary   This data set contains basal heat flux data for Greenland based on satellite magnetic field measurements. The data has been projected and interpolated onto the standard CISM grid.
ellipsoid   WGS84
grid_mapping_name   polar_stereographic
latitude_of_projection_origin   [ 90.]
standard_parallel   [ 71.]
straight_vertical_longitude_from_pole   [-39.]
false_easting   [ 0.]
false_northing   [ 0.]
long_name   Basal Heat Flux
standard_name   upward_geothermal_flux_at_ice_base
units   watts/meter^2
grid_mapping   mapping
creator_name   Glen Granzow
contributor_name   Michael Purucker
contributor_role   Michael Purucker provided the original data from which this data set was interpolated.
reference   Fox Maule, C., Purucker, M.E., Olsen, N. & Mosegaard, K., 2005. Heat flux in Antarctica revealed from satellite magnetic data, Science, 309, 464-467, doi: 10.1126/science.1106888.
comments   The original data, provided by Mike Purucker, giving the basal heat flux at specific longitudes and latitudes is quite sparse. Projection and interpolation of the data onto the CISM standard grid was accomplished using a python script written by Glen Granzow. This script used pyproj, a python interface to the PROJ.4 library, to generate x,y coordinates in the required stereographic projection then matplotlib.mlab.griddata for interpolation. matplotlib.mlab.griddata implements natural neighbor interpolation which is based on Delaunay triangulation. To interpolate onto grid points outside the convex hull of the original data set, four fictitious points were added to the original data, one outside each corner of the final data grid. The assumed value of heat flux at the fictitious points was the mean of the heat flux at the actual data points. The vast majority of the interpolated data influenced by these fictitious points are in the ocean and thus of little concern.
long_name   Cartesian x-coordinate
standard_name   projection_x_coordinate
units   meters
long_name   Cartesian y-coordinate
standard_name   projection_y_coordinate
units   meters
calender   none
long_name   Time
standard_name   time
units   year since 1-1-1 0:0:0