A new, high-resolution surface mass balance map of Antarctica (1979-2010) based on regional atmospheric climate modeling

Details A new, high-resolution surface mass balance map of Antarctica (1979-2010) based on regional atmospheric climate modeling A new, high-resolution surface mass balance map of Antarctica (1979-2010) based on regional atmospheric climate modeling

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3904501l&link_type=abstract

Geophysical Research Letters, Volume 39, Issue 4, CiteID L04501

Physics

4

Cryosphere: Ice Sheets, Cryosphere: Mass Balance (1218, 1223), Hydrology: Snow And Ice (0736, 0738, 0776, 1827), Geographic Location: Antarctica (4207)

Scientific paper

A new, high resolution (27 km) surface mass balance (SMB) map of the Antarctic ice sheet is presented, based on output of a regional atmospheric climate model that includes snowdrift physics and is forced by the most recent reanalysis data from the European Centre for Medium-Range Weather Forecasts (ECMWF), ERA-Interim (1979-2010). The SMB map confirms high accumulation zones in the western Antarctic Peninsula (>1500 mm y-1) and coastal West Antarctica (>1000 mm y-1), and shows low SMB values in large parts of the interior ice sheet (<25 mm y-1). The location and extent of ablation areas are modeled realistically. The modeled SMB is in good agreement with ±750 in-situ SMB measurements (R = 0.88), without a need for post-calibration. The average ice sheet-integrated SMB (including ice shelves) is estimated at 2418 ± 181 Gt y-1. Snowfall shows modest interannual variability (σ = 114 Gt y-1), but a pronounced seasonal cycle (σ = 30 Gt mo-1), with a winter maximum. The main ablation process is drifting snow sublimation, which also peaks in winter but with little interannual variability (σ = 9 Gt y-1).

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