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See detailA Downscaling Approach Toward High-resolution Surface Mass Balance Over Antarctica
Gallée, Hubert; Agosta, Cécile ULg; Gential, Luc et al

in Surveys in Geophysics (2011), 32(4-5), 507-518518

The Antarctic ice sheet surface mass balance shows high spatial variability over the coastal area. As state-of-the-art climate models usually require coarse resolutions to keep computational costs to a ... [more ▼]

The Antarctic ice sheet surface mass balance shows high spatial variability over the coastal area. As state-of-the-art climate models usually require coarse resolutions to keep computational costs to a moderate level, they miss some local features that can be captured by field measurements. The downscaling approach adopted here consists of using a cascade of atmospheric models from large scale to meso-gamma scale. A regional climate model (Modegravele Atmospheacuterique Reacutegional) forced by meteorological reanalyses provides a diagnostic physically-based rain- and snowfall downscaling model with meteorological fields at the regional scale. Although the parameterizations invoked by the downscaling model are fairly simple, the knowledge of small-scale topography significantly improves the representation of spatial variability of precipitation and therefore that of the surface mass balance. Model evaluation is carried out with the help of shallow firn cores and snow height measurements provided by automatic weather stations. Although downscaling of blowing snow still needs to be implemented in the model, the net accumulation gradient across Law Dome summit is shown to be induced mostly by orographic effects on precipitation. [less ▲]

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See detailGEOPHYSICAL INVESTIGATIONS OF SEISMICALLY INDUCED SURFACE EFFECTS: CASE STUDY OF A LANDSLIDE IN THE SUUSAMYR VALLEY, KYRGYZSTAN
Havenith, Hans-Balder ULg; Jongmans, D.; Abdrakhmatov, K. et al

in Surveys in Geophysics (2000), 21

In summer 1998, a geophysical survey including seismic profiles and electrical tomography has been carried out in the Suusamyr valley, Kyrgyzstan. The scope was to investigate surface effects induced by ... [more ▼]

In summer 1998, a geophysical survey including seismic profiles and electrical tomography has been carried out in the Suusamyr valley, Kyrgyzstan. The scope was to investigate surface effects induced by the Ms = 7.3 Suusamyr earthquake, the 19th of August, 1992. In this paper, special attention is paid to the case study of a debris slide triggered by the earthquake. Seismic data are analysed by P-wave refraction technique and by surface wave inversion. Electrical tomographic profiles are processed by 2D-inversion. Using geotechnical and geological information, P-velocity models and resistivity sections are interpreted in terms of geological materials, in order to build a geological 3D model. On the basis of the latter, we carried out static finite element computations as well as static and pseudo-static calculations with Janbu’s method. Newmark displacement was computed, considering or not the influence of the shallow soft deposits. The results are compared to the real displacement observed in the field and conclusions are drawn about the mechanism of the landslide. [less ▲]

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