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Passerini, Andrea
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Passerini, Andrea
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- PublicationOpen AccessEvidence of 14 New Subglacial Lakes in the Dome C-Vostok Area(2003)
; ; ; ; ; ; ; ;Tabacco, I. E.; Università degli Studi di Milano, Sezione Geofisica, Via Cicognara 7, 20129 Milano - Italy ;Forieri, A.; Università degli Studi di Milano, Sezione Geofisica, Via Cicognara 7, 20129 Milano - Italy and Dipartimento di Scienze della Terra, Università di Siena, Via del Laterino 8, 53100 Siena - Italy ;Della Vedova, A.; Università degli Studi di Milano, Sezione Geofisica, Via Cicognara 7, 20129 Milano - Italy ;Zirizzotti, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Bianchi, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;De Michelis, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Passerini, A.; Università degli Studi di Milano Bicocca, Piazza della Scienza 1 , 20126 Milano - Italy; ; ; ; ; ; ; ; ; ;Frezzotti, M.; ENEA Progetto Clima, PO Box 2400, 000100 Roma AD - Italy ;Maggi, V.; Department of Environmental Sciences, University of Milano–Bicocca, Piazza della Scienza 1, I-20126 Milan, Italy; In the last few years subglacial lakes have been of great interest to the scientific community for various reasons. The lakes could be an unknown extreme habitat, which have been isolated from the terrestrial biosphere for a long time. They may have formed before the ice sheet and could perhaps reveal environmental conditions prior to its formation. Lastly, they may play a role in the current dynamics of the ice sheet. Strong radar reflections from the base of the ice sheet can generally be ascribed to either water-saturated basal sediments or subglacial lakes (Oswald & Robin, 1973). Based on radar data alone, the identification of lakes is possible if other features are present: flat and quite horizontal reflectors with nearly constant echo intensity and sharp edges similar to the margins of a catchment basin (Siegert et al., 1996; Siegert & Ridley, 1998; German & Siegert, 1999; Siegert, 2000; Tabacco et al., 2002). Subglacial lakes can be expressed in the overlying ice sheet as extremely flat surfaces with respect to the surrounding slopes (Ridley et al., 1993; Kapitsa et &l996 ; Siegert & Ridley,1998; Tabacco et al., 2002). To date, about 70 lakes have been discovered in all of Antarctica (Siegert et al.,1996); 21 of these are located in the Dome C-Vostok region.14338 358 - PublicationOpen AccessRefined broad-scale sub-glacial morphology of Aurora Subglacial Basin, East Antarctica derived by an ice-dynamics-based interpolation scheme(2011-07-13)
; ; ; ; ; ; ; ; ; ; ; ; ; ;Roberts, J. L.; Department of Sustainability, Environment, Water, Population and Communities, Australian Antarctic Division, Hobart, Tasmania, Australia and Antarctic Climate and Ecosystems Cooperative Research Centre, Private Bag 80, Hobart, Tasmania 7001, Australia ;Warner, R. C.; Department of Sustainability, Environment, Water, Population and Communities, Australian Antarctic Division, Hobart, Tasmania, Australia and Antarctic Climate and Ecosystems Cooperative Research Centre, Private Bag 80, Hobart, Tasmania 7001, Australia ;Young, D.; Institute of Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas, USA ;Wright, A.; School of GeoSciences, University of Edinburgh Edinburgh, Scotland, UK ;van Ommen, T. D.; Department of Sustainability, Environment, Water, Population and Communities, Australian Antarctic Division, Hobart, Tasmania, Australia and Antarctic Climate and Ecosystems Cooperative Research Centre, Private Bag 80, Hobart, Tasmania 7001, Australia ;Blankenship, D. D.; Institute of Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas, USA ;Siegert, M.; School of GeoSciences, University of Edinburgh Edinburgh, Scotland, UK ;Young, N. W.; Department of Sustainability, Environment, Water, Population and Communities, Australian Antarctic Division, Hobart, Tasmania, Australia and Antarctic Climate and Ecosystems Cooperative Research Centre, Private Bag 80, Hobart, Tasmania 7001, Australia ;Tabacco, I. E.; Geofisica, Universita di Milano, Milan, Italy ;Forieri, A.; Geofisica, Universita di Milano, Milan, Italy ;Passerini, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Zirizzotti, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Frezzotti, M.; Agenzia nazionale per le nuove tecnologie, l’energia e lo sviluppo economico sostenibile, Rome, Italy; ; ; ; ; ; ; ; ; ; ; ; Ice thickness data over much of East Antarctica are sparse and irregularly distributed. This poses difficulties for reconstructing the homogeneous coverage needed to properly assess underlying sub-glacial morphology and fundamental geometric constraints on sea level rise. Here we introduce a new physically-based ice thickness interpolation scheme and apply this to existing ice thickness data in the Aurora Subglacial Basin region. The skill and robustness of the new reconstruction is demonstrated by comparison with new data from the ICECAP project. The interpolated morphology shows an extensive marine-based ice sheet, with considerably more area below sea-level than shown by prior studies. It also shows deep features connecting the coastal grounding zone with the deepest regions in the interior. This has implications for ice sheet response to a warming ocean and underscores the importance of obtaining additional high resolution data in these marginal zones for modelling ice sheet evolution.705 170 - PublicationOpen AccessMorphology of bottom surfaces of glacier ice tongues in the East Antarctic region(2001-02)
; ; ; ; ; ; ;Bianchi, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Chiappini, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Tabacco, I. E.; Università di Milano, Sezione Geofisica, Milano, Italy ;Passerini, A.; Università di Milano Bicocca, Dipartimento di Fisica, Milano, Italy ;Zirizzotti, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Zuccheretti, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; ; During three Antarctic summer campaigns (1995/97/99) Radio Echo Sounding (RES) system data from some glacier ice tongues in the East Antarctic regions between Victoria Land and George V Land were collected. The morphology and structure of the bottom surfaces deduced from the electromagnetic interpretation of echo signal were observed. The bottom surfaces at the ice/water interface show either irregular or flat contours or both. Some ice tongues are nearly perfectly flat, others show clear signs of irregularities while three of them have good regular spaced rippled bottom surfaces. The latter structures are well-evident in the longitudinal traverse of the tongues, whereas the transversal paths do not show the same features. This particular shape of the bottom surfaces related to the ablation process and detachment mechanism could be interesting especially to determine some physical characteristics and the possible fracture points of the ice tongues.14233 1133 - PublicationOpen AccessLatest improvements for the echo sounding system of the Italian radar glaciological group and measurements in Antarctica(1999-04)
; ; ; ; ; ; ;Tabacco, I. E.; Sezione Geofisica, Università di Milano, Italy ;Bianchi, C.; Istituto Nazionale di Geofisica, Roma, Italy ;Chiappini, M.; Istituto Nazionale di Geofisica, Roma, Italy ;Passerini, A.; Dipartimento di Fisica, Università di Milano, Italy ;Zirizzotti, A.; Istituto Nazionale di Geofisica, Roma, Italy ;Zuccheretti, E.; Istituto Nazionale di Geofisica, Roma, Italy; ; ; ; ; Radio echo sounding is an active remote-sensing method using electromagnetic wave penetration in a particular medium such as ice and permits the measurements of its thickness, the level of the bedrock and inhomogeneities i.e. of the internal layering of glaciers. The Italian Radar Glaciological Group has implemented technical improvements on the system operating during the 1995-1996 Antarctic expeditions, increasing the horizontal and the vertical resolution by means of a new acquisition ensemble. The new system was used during the Antarctic expedition in 1997-1998. The present paper presents the latest improvements of the radar acquisition system and radar profiles extracted from the 1995-1996 and the 1997-1998 Antarctic expeditions are presented.14236 268 - PublicationOpen AccessA New Bedrock Map of the Dome C Area(2003)
; ; ; ; ; ; ; ;Forieri, A.; Università degli Studi di Milano, Sezione Geofisica, via Cicognara 7, 1-20129 Milano - Italy and Dipartimento di Scienze della Terra, Università di Siena, Via del Laterino 8, 53100 Siena - Italy ;Tabacco, I. E.; Università degli Studi di Milano, Sezione Geofisica, via Cicognara 7, 1-20129 Milano - Italy ;Della Vedova, A.; Università degli Studi di Milano, Sezione Geofisica, via Cicognara 7, 1-20129 Milano - Italy ;Zirizzotti, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Bianchi, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;De Michelis, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Passerini, A.; Università degli Studi di Milano Bicocca, Piazza della Scienza 1, 1-20126 Milano - Italy; ; ; ; ; ; ; ; ; ;Frezzotti, M.; ENEA Progetto Clima, PO Box 2400, 000100 Roma AD - Italy ;Maggi, V.; Department of Environmental Sciences, University of Milano–Bicocca, Piazza della Scienza 1, I-20126 Milan, Italy; A large number of airborne and ground-based radar echo sounding (RES) data were collected in the Dome C - Vostok region during the Italian Antarctic expeditions in 1995, 1997, 1999 and 2001. Tabacco et al. (1998) used the 1995 data to produce a topographic map of Dome C. We present a new map of bed topography based on all collected radar data.14278 481