The spatial and temporal variability of the surface mass balance in Antarctica: results from a regional atmospheric climate model

作者: Nicole P. M. van Lipzig , Erik van Meijgaard , Johannes Oerlemans

DOI: 10.1002/JOC.798

关键词:

摘要: A 14 year integration with a regional atmospheric model (RACMO) is used to obtain detailed information on the Antarctic surface mass balance and understand mechanisms that are responsible for spatial temporal distribution of balance. The (Δx = 55 km) uses parameterizations physical processes from ECHAM4 general circulation driven lateral boundaries by 15 re-analyses European Centre Medium-range Weather Forecasts (ERA-15). Sea temperature sea ice extent prescribed observations. The evaluated in situ measurements pressure, 2 m temperature, Generally, good agreement found between output measurements, although interior sheet temperatures slightly too high summer. mean averaged over grounded 〈B〉 156 mm water equivalent per year. statistical relation precipitation topographical parameters derived output. Half variance can be explained distance coast. Locally, direction flow important; Ellsworth Land Wilkes larger than expected basis topography alone, because directed inland. year-to-year variability similar value ERA-15 (standard deviation annual values 6 7% mean) determined not variations or humidity. In sheet, seasonality mainly but, near coast, dynamics important. For example, Dronning Maud highest autumn, when upslope component wind vector at 500 hPa largest. Year-to-year large might affect proxies meteorological variables cores. Copyright © 2002 Royal Meteorological Society.

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