This dataset uses a global seismic model of the crust and upper mantle to extrapolate existing heat-flux measurements to areas where there are few data, using a "structural similarity function". The original data are gridded on a geographic (lat-lon) grid, so when they are projected to a polar stereographic projection, this creates problems in gridding straight to 5 km resolution, due to the directionality of the points used in the interpolation procedure. The gridding introduces elongated features which are not present in the original data.

The effective resolution of the data (in latitude anyway) is 100 km. Therefore the data were first gridded on to a 100 km grid using spline interpolation. The 100 km grid points were then reinterpolated, again using spline interpolation, onto the 5 km grid. This reduces the elongated features whilst retaining most of the detail in the original dataset.

The data unit is mW m-2.

Originators: http://doi.pangaea.de/10.1594/PANGAEA.734145

Publisher: Le Brocq, A. M., Payne, A. J., and Vieli, A.: An improved Antarctic dataset for high resolution numerical ice sheet models (ALBMAP v1), Earth Syst. Sci. Data, 2, 247-260, doi:10.5194/essd-2-247-2010, 2010.

Publication date: 2010

References: Shapiro, N. M. and Ritzwoller, M. H.: Inferring surface heat flux distributions guided by a global seismic model: particular application to Antarctica, Earth Planet. Sc. Lett., 223, 213-224, 2004.

Editors
Glaciology

Catherine Ritz
catherine.ritz@univ-grenoble-alpes.fr

Anne LeBrocq
A.LeBrocq@exeter.ac.uk