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 the MWP was indeed dryer, while the subsequent LIA was colder and wetter, thus confirming that δ 13 C in cave ice can be used as a valuable proxy for past precipitation changes. CHINA’S ANTI-SEASON ICE CAVES Shu L. 1, 2 , Jin S. 1, 2 , Huang S. 1 , Zhang Q. 1 & Wu Z. 1 1 School of Energy and Power Engineering, Huazhong University of Science & Technology, 1037 Luoyu Road, Wuhan, China 2 Innovation Research Institute , Huazhong University of Science & Technology, 1037 Luoyu Road, Wuhan, China An anti-season ice cave (ASIC) is an anomalous and infrequent natural phenomenon: the ice in the caves freezes in midsummer or late spring rather than in winter. It is a miracle created by the unique local geological structure. In zones of anti-season ice cave, the special local climate creates special plant communities which are different from the surrounding plant distribution. These ASICs and their plant communities have high sensitivity to climate change, so they can be used as characteristic markers in the study of climate change. On the other hand, they are also important tourism resources; actually during recent years, they have been developed in varying degrees. Due to tourism exploitation or other unknown factors, some ASICs of China are suffering a recession. To reveal the mechanism of ASICs‟ operation can not only interpret a natural mystery, but also help their protection and save them from destructive exploitation. Therefore, it is a significant work in both scientific and practical areas. In this paper, the geographical distribution of China‟s anti-season ice caves is given in the first part, followed by description of each ASIC and the current situation of study on ASIC. Finally, considering the defects of current descriptive studies, a new model based on thermodynamics is proposed in the last part. This model can give explanations of the power of air circulation, energy budget and transition mechanism of ASIC. 37
5 th Int. Workshop on Ice Caves (IWIC – V) Barzio (LC), Valsassina, Grigna and Milano, September 16 – 23, 2012 Volume of Abstracts TWO MILLENNIA OF NATURAL TO ANTROPOGENIC EFFECTS IN TRANSYLVANIA FROM FOCUL VIU ICE CORE Maggi V. 1 , Turri S. 2 , Bini A. 3 , Perşoiu A. 4 , Onac B. 4 , Stenni B. 5 & Udisti R. 6 1 Environmental Sciences Dept., University of Milano-Bicocca, Italy 2 GeoSFerA Studio Associato di Geologia, Varese, Italy 3 Earth Sciences Dept., University of Milano, Italy 4 Dept. of Geology, University of South Florida, 4202 E. Fowler Avenue, SCA 528, Tampa, 33620, Fl, USA 5 Geosciences Dept., University of Trieste, Italy 6 Chemistry Dept., University of Florence, Italy The 8.26 m of ice core drilled in Focul Viu Ice Cave (Apuseni Mountains, Romania) represent one of the longest records from hypogean ice deposits. A set of 8 radiocarbon dates was done on organic materials found in the ice cores at different depth, and estimate of the age at 6.84 m depth, the bottommost samples, is of 1752±66 B.P. (calibrated date). Major ions were measured for atmospheric composition record reconstructions. Some huge nss-SO4 2- (no-sea-salt sulphates) spikes were preliminary related with historical well-known explosive volcanic events, with an improve of age/depth time scale. Using both 14 C dates and volcanic spikes, was evaluates the variability of the accumulation rate of ice deposits, that show a mean value for the entire ice core of 34,8 cm/century of ice. A detailed behaviour was observed among different stratigraphic periods, with special emphasis to the Middle Age period with a huge accumulation, 3 time the following period 1400-1800. The last 2 centuries were characterized by the industrial impact on the atmospheric composition. Using the record of Ammonia, that can be related to biomass burning from forest clearance or agriculture practise, will describe the influences of the anthropogenic activities in the Transylvania during the last two millennia. Interpolating the accumulation rate of the deeper part of the ice core, below the 6,84 m depth, was estimated the age of the bottom ice at 8,26 m depth of at around the 2600 B.P. (V century A.C.), at the beginning of Roman period. 38
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Page 13 and 14: Dear Participants, we are very plea
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