Volume of Abstracts - Università degli Studi di Milano

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5 th Int. Workshop on Ice Caves (IWIC – V) Barzio (LC), Valsassina, Grigna and Milano, September 16 – 23, 2012 Volume of Abstracts This poster shows the main karst features recently observed on this glacier: moulins with deep en-glacial canyons at their base are common, but there are some peculiarities, such as big subglacial caves at the snout, a surprisingly stable subglacial cave in a dead ice mass, and moulins reaching the bedrock. The evolution of glacial caves, mainly contact caves at the snout, is strictly related with the evolution of the glacier morphology. FIRST SURVEYS IN AN ICE CAVE OF THE MONTE CANIN MASSIF, ALPI GIULIE (ITALY) Bearzot F. 1 , Colucci R.R. 1,2 , Finocchiaro F. 1 , Forte E. 1 , Guglielmin M. 3 & Potleca M. 4 1 University of Trieste, Department of Mathematic and Geoscience (DMG) – via Weiss 2, 34128 Trieste, Italy 2 National Research Council (CNR), ISMAR Trieste – Viale R. Gessi 2, 34123 Trieste, Italy 3 Insubria University, BICOM Varese – via HJ Dunant 3, 21100 Varese, Italy 4 Regione Friuli Venezia Giulia – via Natisone 43, 33057 Palmanova, Italy The Monte Canin massif host a large number of karst caves and for this reason an intense research caving activity is here very well developed since several decades. Although in a certain number of these cavities the presence of snow and ice is reported, and in some of them permanent and layered ice is well recognizable, the study of the underground cryosphere has never been undertaken. At the end of summer 2010 a karst cave filled by a permanent ice deposit has been identified to be suitable for a systematic monitoring. During summer 2011 started the investigation of this ipogea environment by installing of several monitoring stations. Actually 14 temperature probes are recording air, rock and ice temperature every 30 minutes using Tynitag data-loggers. Rock temperature probes are inserted at three different depths (2 cm, 30 cm and 100 cm) and in three sites (inside and outside the cave), while ice temperature is detected at 30 cm and 100 cm of depth, at the top of the ice body. Air temperature is detected at the bottom of the cave (underneath the ice body), in the main cavern and outside the cave. Two fixed reference marks were installed at the top of the ice body and are periodically measured in order to detect possible spatial and temporal changes of the ice mass. Moreover several GPR profiles have been acquired within the cave using 500 and 800MHz shielded antennas to define the ice thickness variations and possible ice layering. During summer 2012 a new topographic survey has been realized in order to geo-referencing the cave in GIS environment and to draw the most peculiar sections. A complete stratigraphy of the ice layers is now also available to be used as calibration for the GPR sections as well. 57
5 th Int. Workshop on Ice Caves (IWIC – V) Barzio (LC), Valsassina, Grigna and Milano, September 16 – 23, 2012 Volume of Abstracts Despite of the gap of knowledge on the frozen karst caves in the area, all this instrumental and direct observations could provide a useful key to understand the permafrost distribution and its connections with the underground cryosphere and the glaciological evolution of the landscape ICE LEVEL CHANGES FROM SEASONAL TO DECADAL TIME-SCALE AT LAVA BEDS NATIONAL MONUMENT, NE CALIFORNIA, USA Kern Z. 1,2 & Thomas, S. 3 1 Climate and Environmental Physics, Physics Institute, University of Bern and Oeschger Center for Climate Change, Bern, Switzerland 2 MTA CSFK, Institute for Geological and Geochemical Research, Budapest, Hungary 3 Lava Beds National Monument, California, USA Numerous lava tube caves host seasonal or perennial ice accumulation in the Lava Beds region (41.5°N, 121.5°W). Regular ice level monitoring has been conducted for eight ice caves since 1990, and additional five caves were also included into the monitoring network during recent years. Monitoring data reveal that the seasonal cave ice phenology can be characterized by autumnal ice level low-stands. Regarding the multiannual evolution, both positive and negative ice mass balance periods were detected during the past 23 years. Positive mass balances were reported for many caves from the late 1990s. Ice level is still stable in Skull Ice Cave, B-020 and U-200. However severe ice loss has characterized the evolution of the other caves. Major ice loss started in 1998-99 in the Merrill, C-270 and M-470 ice caves, while not until 2003 in L-800. The recent rapid ice melt was fatal for some caves. Perennial ice disappeared from M-470 and M-475 by 2005 and from Merrill Ice Cave by 2006, for instance. TECHNICAL EXPERIENCE MADE INSTRUMENTING LO LC 1650 ICE CAVE (“ABISSO SUL MARGINE DELL’ALTO BREGAI”) 1 Servizi Territorio srl (info@serviziterritorio.it) Alberici A. 1 , Favaron M. 1 & Fraternali D. 1 The poster presents the technical challenges found in deploying a complex measurement and data acquisition system at LO LC 1650 site, 58
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IWIC - V 5 th INTERNATIONAL WORKSHO
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President 5 th Int. Workshop on Ice
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Volume of Abstracts - Università degli Studi di Milano

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