Talos Dome is an ice dome on the edge of the East Antarctic plateau; it is adjacent to the Victoria Land mountains and overlies the eastern margin of the Wilkes Subglacial Basin. As part of the ITASE project, two traverse surveys were carried out in the Talos Dome area in November 1996 and January 2002. Airborne radar surveys were conducted in 1995, 1997, 1999 and 2001. Analysis of ERS-1 Radar Altimeter data allowed the positioning of Talos Dome about 50 km South of the 1960s location. A new plano-altimetric map of the Talos Dome area locates the dome culmination (159°04'21” E, 72°47'14” S, 2318.5 m) about 1.5 km north of the previous ERS-1 position. A surface strain network of nine stakes was measured using GPS in 1996, 1998 and 2002. Data indicates that ice at the TD site moves SSE a few centimetres per year. The other stakes move with radial velocities of 0.11 to 0.34 m a-1. The higher velocities are recorded in the steeper S-SW and E-NE slopes. Airborne radar measurements were carried out on 4320 km2 in the Dome area. Results indicate that the bedrock at the Talos Dome summit is about 400 m in elevation (WGS84) and that it is covered by about 1900 m of ice. Three hundred kilometres of snow radar (GPR) and GPS surveys show that the internal layering is continuous and horizontal up to 15 km from the dome, and highlight variations in the elevation of internal layers. The depth distribution analysis of layers reveals that accumulation decreases downwind of the dome (N-NE) and increases upwind (SSW). The palaeo-summit positions of the 4 layers are coherent and indicate that, over the past 500 years, the culmination of Talos Dome moved NNE at an average rate of about 1 m a-1. In order to calculate a preliminary age vs. depth profile for Talos Dome, a simple one-dimensional steady-state model was formulated; this model predicts that the ice 100 meters above the bedrock may cover more than one glacial/interglacial period (160-240 kyr).
Geophysical Survey at Talos Dome (East Antarctica): the Search for a New Deep-Drilling Site / FREZZOTTI M.; BITELLI G.; DE MICHELIS P.; DEPONTI A.; FORIERI A.; GANDOLFI S.; MAGGI V.; MANCINI F.; REMY F.; TABACCO E.I.; URBINI S.; VITTUARI L.; ZIRIZZOTTI A.. - In: ANNALS OF GLACIOLOGY. - ISSN 0260-3055. - STAMPA. - 39:(2004), pp. 423-432.
Geophysical Survey at Talos Dome (East Antarctica): the Search for a New Deep-Drilling Site
BITELLI, GABRIELE;GANDOLFI, STEFANO;VITTUARI, LUCA;
2004
Abstract
Talos Dome is an ice dome on the edge of the East Antarctic plateau; it is adjacent to the Victoria Land mountains and overlies the eastern margin of the Wilkes Subglacial Basin. As part of the ITASE project, two traverse surveys were carried out in the Talos Dome area in November 1996 and January 2002. Airborne radar surveys were conducted in 1995, 1997, 1999 and 2001. Analysis of ERS-1 Radar Altimeter data allowed the positioning of Talos Dome about 50 km South of the 1960s location. A new plano-altimetric map of the Talos Dome area locates the dome culmination (159°04'21” E, 72°47'14” S, 2318.5 m) about 1.5 km north of the previous ERS-1 position. A surface strain network of nine stakes was measured using GPS in 1996, 1998 and 2002. Data indicates that ice at the TD site moves SSE a few centimetres per year. The other stakes move with radial velocities of 0.11 to 0.34 m a-1. The higher velocities are recorded in the steeper S-SW and E-NE slopes. Airborne radar measurements were carried out on 4320 km2 in the Dome area. Results indicate that the bedrock at the Talos Dome summit is about 400 m in elevation (WGS84) and that it is covered by about 1900 m of ice. Three hundred kilometres of snow radar (GPR) and GPS surveys show that the internal layering is continuous and horizontal up to 15 km from the dome, and highlight variations in the elevation of internal layers. The depth distribution analysis of layers reveals that accumulation decreases downwind of the dome (N-NE) and increases upwind (SSW). The palaeo-summit positions of the 4 layers are coherent and indicate that, over the past 500 years, the culmination of Talos Dome moved NNE at an average rate of about 1 m a-1. In order to calculate a preliminary age vs. depth profile for Talos Dome, a simple one-dimensional steady-state model was formulated; this model predicts that the ice 100 meters above the bedrock may cover more than one glacial/interglacial period (160-240 kyr).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
