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A new surface accumulation map for western Dronning Maud Land, Antarctica, from interpolation of point measurements

  • Gerit Rotschky (a1), Per Holmlund (a2), Elisabeth Isaksson (a3), Robert Mulvaney (a4), Hans Oerter (a1), Michiel R. Van Den Broeke (a5) and Jan-Gunnar Winther (a3)...

Abstract

As a result of intensive field activities carried out by several nations over the past 15 years, a set of accumulation measurements for western Dronning Maud Land, Antarctica, was collected, based on firn-core drilling and snow-pit sampling. This new information was supplemented by earlier data taken from the literature, resulting in 111 accumulation values. Using Geographical Information Systems software, a first region-wide mean annual snow-accumulation field was derived. In order to define suitable interpolation criteria, the accumulation records were analyzed with respect to their spatial autocorrelation and statistical properties. The resulting accumulation pattern resembles well- known characteristics such as a relatively wet coastal area with a sharp transition to the dry interior, but also reveals complex topographic effects. Furthermore, this work identifies new high-return shallowdrilling sites by uncovering areas of insufficient sampling density.

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References

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