Greenland Basal Heat Flux
From Interactive System for Ice sheet Simulation
GLOBAL ATTRIBUTES | |
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. |
mapping | |
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.] |
bheatflx | |
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. |
contributor_url | http://core2.gsfc.nasa.gov/research/purucker/heatflux_updates.html |
reference_url | http://core2.gsfc.nasa.gov/research/purucker/foxmaule_dkc09-09_greenland.pdf |
source | http://core2.gsfc.nasa.gov/research/purucker/heatflux_mf7_foxmaule05.txt |
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. |
x1 | |
long_name | Cartesian x-coordinate |
standard_name | projection_x_coordinate |
units | meters |
y1 | |
long_name | Cartesian y-coordinate |
standard_name | projection_y_coordinate |
units | meters |
time | |
calender | none |
long_name | Time |
standard_name | time |
units | year since 1-1-1 0:0:0 |