For the attention of Antarctic ice sheet modellers,
I would like to bring your attention to an improved dataset
for high resolution modelling of the Antarctic Ice Sheet. The dataset
contains various 5 km resolution grids describing the ice sheet configuration,
surface air temperature, accumulation, geothermal heat flux and firn
correction. The configuration data is largely based on the BEDMAP
dataset, but incorporates new data on ice thickness (grounded and floating) and
bathymetry. The dataset also contains a number of modifications to ensure
that the dataset is self-consistent. For example, some sub-iceshelf
cavities are re-interpolated to ensure that the ice shelf is able to float,
which was not the case in the original BEDMAP.
The purpose of the dataset is to provide a self-consistent
dataset that can be used as a starting point for ice sheet models that aim to
model forward in time from the present day ice sheet configuration. Much
effort has been expended to ensure that the grounding line is as similar as
possible to that observed, and that the ice sheet surface is left unmodified in
ice stream/grounding zone locations.
I would strongly encourage you to thoroughly read the
documentation, to understand the processing and assumptions that have gone into
the dataset, particularly with respect to the firn correction and its
incorporation in flotation calculations.
The data is provided in a netcdf format, on a polar
stereographic grid, further information is included in the documentation.
A publication will be submitted to Earth System Science Data
in the near future. It is envisaged that new versions will be produced
as new data is incorporated.
Thanks to those that have made their data available for
incorporation into the dataset, either via public download or pers comm:
The BEDMAP project, Robert
Athern, Jonathan Bamber, Josefino Comiso, Laura Edwards, Cathrine Fox Maule, Jennifer
Griggs, Frank Nitsche, Nicholai Shapiro, Michiel Van den Broekeand David Vaughan& AGASEA/BBAS.
Anne Le Brocq & co-authors Tony Payne & Andreas
Dr. Anne Le Brocq
School of Geography
University of Exeter
+44 (0)1392 724071
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