Abstract
Surface mass balance (SMB) distribution and its temporal and spatial variability is an essential input parameter in mass balance studies. Different methods were used, compared and integrated (stake farms, ice cores, snow radar, surface morphology, remote sensing) at eight sites along a transect from Terra Nova Bay (TNB) to Dome C (DC) (East Antarctica), to provide detailed information on the SMB. Spatial variability measurements show that the measured maximum snow accumulation (SA) in a 15 km area is well correlated to firn temperature. Wind-driven sublimation processes, controlled by the surface slope in the wind direction, have a huge impact (up to 85% of snow precipitation) on SMB and are significant in terms of past, present and future SMB evaluations. The snow redistribution process is local and has a strong impact on the annual variability of accumulation. The spatial variability of SMB at the kilometre scale is one order of magnitude higher than its temporal variability (20–30%) at the centennial time scale. This high spatial variability is due to wind-driven sublimation. Compared with our SMB calculations, previous compilations generally over-estimate SMB, up to 65% in some areas.
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Acknowledgements
Research was carried out in the framework of the Project on Glaciology of the PNRA-MIUR and financially supported by PNRA through a co-operation agreement with ENEA Roma. This work is a contribution by the Italian-France branch of the ITASE project and is also supported by the French Polar Institute (IPEV). It is an associate program to the ‘European Project for Ice Coring in Antarctica’ (EPICA), a joint ESF (European Science Foundation)/UE scientific program. The authors wish to thank all members of the traverse team, the participants in PNRA 1998/99 who assisted at the Zucchelli Station at TNB and Concordia Station and everyone in Italy and France who helped to prepare the traverse. Thanks are due to M. Giovinetto and D. Vaughan, who provided SMB compilations, V. Masson-Delmotte, E. Isaksson and other anonymous reviewers whose comments and editing helped to improve the manuscript.
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Frezzotti, M., Pourchet, M., Flora, O. et al. New estimations of precipitation and surface sublimation in East Antarctica from snow accumulation measurements. Climate Dynamics 23, 803–813 (2004). https://doi.org/10.1007/s00382-004-0462-5
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DOI: https://doi.org/10.1007/s00382-004-0462-5