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Snow Accumulation in the Talos Dome Area: Preliminary Results
Language
English
Obiettivo Specifico
3.8. Geofisica per l'ambiente
Status
Published
JCR Journal
N/A or not JCR
Peer review journal
Yes
Title of the book
Issue/vol(year)
/ 14 (2008)
Publisher
Terra Antartica Publication
Pages (printed)
21-25
Issued date
July 2008
Keywords
Abstract
Determining snow accumulation is one of the principal challenges in mass balance studies and in the interpretation of ice core records. Accurate knowledge of the spatial distribution of snow accumulation is fundamental for understanding the present mass balance and its implication on sea level change, for reliable numerical simulation of past and future ice sheet dynamics, and for creating atmospheric climate models. Depth-age models for deep ice cores require knowledge of the temporal variability of snow accumulation. Accumulation of snow principally results from precipitation of snow and its redistribution/ablation by wind at the surface (Frezzotti et al., 2004a). Chemical and isotopic analysis of ice cores reveals seasonal and annual signals. However, these signals may not be representative of
annual snow accumulation or of the annual chemical/isotopic composition of snow.
Talos Dome (TD, 72°48’S; 159°06’E, 2316 m, T -41.0 °C) is an ice dome on the edge of the East Antarctic plateau, about 290 km from the Southern Ocean and 250 km from the Ross Sea (Fig. 1). An ice core is currently being drilled at this site (Frezzotti et al., 2004b) within the framework of the Talos Dome Ice Core Project (TALDICE). In order to provide detailed information on the temporal and spatial variability of snow accumulation, research was conducted at Talos Dome and
along a North-South transect (GV7-GV5-TD-31DPT) in the framework of the ITASE programme. The 400 km-long transect follows the ice divide from the Southern
Ocean to Talos Dome, and then continues in a southward direction towards Taylor Dome. Stake network measurements, ice core analysis and snow radar surveys along the transect have provided detailed information for reconstructing the temporal (annual) and spatial (meter scale) variability of snow accumulation over the last 200 years at the km scale.
annual snow accumulation or of the annual chemical/isotopic composition of snow.
Talos Dome (TD, 72°48’S; 159°06’E, 2316 m, T -41.0 °C) is an ice dome on the edge of the East Antarctic plateau, about 290 km from the Southern Ocean and 250 km from the Ross Sea (Fig. 1). An ice core is currently being drilled at this site (Frezzotti et al., 2004b) within the framework of the Talos Dome Ice Core Project (TALDICE). In order to provide detailed information on the temporal and spatial variability of snow accumulation, research was conducted at Talos Dome and
along a North-South transect (GV7-GV5-TD-31DPT) in the framework of the ITASE programme. The 400 km-long transect follows the ice divide from the Southern
Ocean to Talos Dome, and then continues in a southward direction towards Taylor Dome. Stake network measurements, ice core analysis and snow radar surveys along the transect have provided detailed information for reconstructing the temporal (annual) and spatial (meter scale) variability of snow accumulation over the last 200 years at the km scale.
References
Fisher D.A., N. Reeh, & H.B. Clausen, 1985. Stratigraphic noise in time series derived from ice cores.
Ann. Glaciol., 7, 76-83.
Frezzotti M., G. Bitelli, P. de Michelis, A. Deponti, A. Forieri, S. Gandolfi, V. Maggi, F. Mancini, F. Rémy,
I.E. Tabacco, S. Urbini, L. Vittuari & A. Zirizzotti, 2004b. Geophysical survey at Talos Dôme (East
Antarctica): The search for a new deep-drilling site. Ann. Glaciol., 39, 423-432.
Frezzotti M., S. Gandolfi & S. Urbini, 2002. Snow megadunes in Antarctica: sedimentary structure and
genesis. J. Geoph. Res., 107(D18), 4344, 10.1029/2001JD000673, 1-12.
Frezzotti M., M. Pourchet, O. Flora, S. Gandolfi, M. Gay, S. Urbini, C.Vincent, S. Becagli, R. Gragnani,
M. Proposito, M. Severi, R. Traversi, R. Udisti & M. Fily, 2004a. New estimations of precipitation
and surface sublimation in East Antarctica from snow accumulation measurements. Climate
Dynamics, DOI: 10.1007/s00382-004-0462-5, 23, 7-8, 803-813.
Frezzotti M., M. Pourchet, O. Flora, S. Gandolfi, M. Gay, S. Urbini, C. Vincent, S. Becagli, R. Gragnani,
M. Proposito, M. Severi, R. Traversi, R. Udisti & M. Fily, 2005. Spatial and temporal variability of
snow accumulation in East Antarctica from traverse data. J. Glaciol., 51(207), 113-124.
Magand O., M. Frezzotti, M. Pourchet, B. Stenni, L. Genoni & M. Fily, 2004. Climate variability along
latitudinal and longitudinal transects in East Antarctica. Ann. Glaciol., 39, 351-358.
Richardson C., E. Aarholt, S.-E. Hamran, P. Holmlund & E. Isaksson, 1997. Spatial snow distribution of
snow in western Dronning Maud Land, East Antarctica, mapped by a ground based snow radar. J.
Geophys. Res., 102(B9), 20,343-20,353.
Stenni B., M. Proposito, R. Gragnani, O. Flora, J. Jouzel, S. Falourd & M. Frezzotti, 2002. Eight centuries
of volcanic signal and climate change at Talos Dome (East Antarctica). J. Geoph. Res., D9, 107,
10.1029/2000JD000317, 1-14.
Ann. Glaciol., 7, 76-83.
Frezzotti M., G. Bitelli, P. de Michelis, A. Deponti, A. Forieri, S. Gandolfi, V. Maggi, F. Mancini, F. Rémy,
I.E. Tabacco, S. Urbini, L. Vittuari & A. Zirizzotti, 2004b. Geophysical survey at Talos Dôme (East
Antarctica): The search for a new deep-drilling site. Ann. Glaciol., 39, 423-432.
Frezzotti M., S. Gandolfi & S. Urbini, 2002. Snow megadunes in Antarctica: sedimentary structure and
genesis. J. Geoph. Res., 107(D18), 4344, 10.1029/2001JD000673, 1-12.
Frezzotti M., M. Pourchet, O. Flora, S. Gandolfi, M. Gay, S. Urbini, C.Vincent, S. Becagli, R. Gragnani,
M. Proposito, M. Severi, R. Traversi, R. Udisti & M. Fily, 2004a. New estimations of precipitation
and surface sublimation in East Antarctica from snow accumulation measurements. Climate
Dynamics, DOI: 10.1007/s00382-004-0462-5, 23, 7-8, 803-813.
Frezzotti M., M. Pourchet, O. Flora, S. Gandolfi, M. Gay, S. Urbini, C. Vincent, S. Becagli, R. Gragnani,
M. Proposito, M. Severi, R. Traversi, R. Udisti & M. Fily, 2005. Spatial and temporal variability of
snow accumulation in East Antarctica from traverse data. J. Glaciol., 51(207), 113-124.
Magand O., M. Frezzotti, M. Pourchet, B. Stenni, L. Genoni & M. Fily, 2004. Climate variability along
latitudinal and longitudinal transects in East Antarctica. Ann. Glaciol., 39, 351-358.
Richardson C., E. Aarholt, S.-E. Hamran, P. Holmlund & E. Isaksson, 1997. Spatial snow distribution of
snow in western Dronning Maud Land, East Antarctica, mapped by a ground based snow radar. J.
Geophys. Res., 102(B9), 20,343-20,353.
Stenni B., M. Proposito, R. Gragnani, O. Flora, J. Jouzel, S. Falourd & M. Frezzotti, 2002. Eight centuries
of volcanic signal and climate change at Talos Dome (East Antarctica). J. Geoph. Res., D9, 107,
10.1029/2000JD000317, 1-14.
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