1,721,042 research outputs found
Rock glaciers inventory of the Italian Alps. Rhaetian A. Catasto dei rock glacier delle Alpi Italiane. Alpi Retiche
No full textInterest in rock glaciers has a long-standing tradition in ltaty. Harmann, Nangeroni and Capello pioneered work on this type of landfonn in the Wesfem and Central Alps,
starting from the mid 19205; this work was continued until the end of the 19505. After
that time. in other countries indepth research continued and developed beyond the
already completed descriptive phase, whereas in Italy specific research on this topic
was no longer being done. It was only at the start of the 19805 that within the scope of
work being done by the Glaciology Section of the Gruppo Nazionale Geografia Fisica e
Geomorfologia (National Group on Physical Geography and Geomorphology) of the
Consiglio Nazionale delle Ricerche (National Research Council), thanks to the efforts of
G.B. Casliglioni, interest in these landforms so characteristic of the morphoclimatic
periglacial and glacial domain, was renewed once again. This interest was then
transformed into the energetic activity of all of the members of the Sector as regards
the preparation of the inventory presented here
Correlation between vegetation pattern and micromorphology in periglacial areas of the central Alps
No full textThe distributional patterns of planet species were analyzed within periglacial microforms belonging to the collective groups of patterned grounds and sorted stripes in the Ortles-Cevedale group (Lombardy, Italy). The edges of primitive polygons are practically free of vegetation, whilst the central areas are colonized by pioneer plants of detritic slopes. This is clearly correlated with a low degree of sediment sorting. The centre of the most evolved polygons is covered by a carpet of Salix herbacea. Age determinations of Salix shoots are not useful for dating purposes, but provide information about the local microclimate. -from Author
Recent (1975-2003) changes in the Miage debris-covered glacier tongue (Mont Blanc, Italy) from analysis of aerial photos and maps
No full textABSTRACT: DIOLAIUTI G., D’AGATA C., MEAZZA A., ZANUTTA A. &
SMIRAGLIA C., Recent (1975-2003) changes in the Miage debris-covered
glacier tongue (Mont Blanc, Italy) from analysis of aerial photos and maps.
(IT ISSN 0391-9838, 2009).
The present study aims at identifying any changes in volume and
thickness of the Miage Glacier tongue (Mont Blanc Massif, Italy) during
the period 1975-2003. The Miage glacier developed the largest part of its
debris cover over the last century, now found mostly between the glacier
terminus (about 1850 m a.s.l.) and the upper ablation tongue (c. 2400 m
a.s.l.) on a surface area of c. 4 km2. The period examined (1975-2003) addresses
climate conditions which were glacier-favourable (around the
1980s), as well as glacier-unfavourable (since the early to mid-1990s),
thus contributing to an understanding of the behaviour of debris covered
glaciers under a changing climate.
The analysis was based on the comparison between digital elevation
models (DEMs), derived from historical records, specifically maps
(1975; scale 1:10,000) and photogrammetric surveys (1991 and 2003, scale
1:15,000). The results show a general glacier volume loss (–16.640 x 106 m3)
from 1975 to 2003; nevertheless if we focus on the two time sub-windows
(i.e.: 1975-1991 and 1991-2003) opposite trends are found: in the period
1975-1991 the volume variation of the Miage Glacier was about +19.25x106
m3, in the period 1991-2003, on the other hand, a volume decrease of about
–36.2x106 m3 occurred. Analysis shows that volume changes were strongly
influenced by the supraglacial debris coverage which on Miage glacier
tongue modulates the magnitude and rates of buried ice ablation
Chemical and isotopic profiles from snow pits and shallow firn cores on Campbell Glacier, northern Victoria Land, Antarctica
No full textapporti tra vegetazione e permafrost discontinuo in ambiente alpino. Val Vallaccia (Livigno, Sondrio)
No full textanalisi dei rapporti tra vegetazione e permafrost discontinuo sulle Alpi centrali Italiane
The Mount S. Matteo (Lombardy, Italian Alps) case: a serac ready to fall?
No full textSeveral crevasses appeared changing rapidly on the serac of the north face of Mount S. Matteo (Ortles-Cevedale Group, Italy) during spring 2005 and they were noticed by some mountaineers. This phenomenon suggested an high risk of a huge serac fall, so the Universities of Milan and Brescia together with operators of Italian Glaciologi-cal committee (CGI) and Lombardy Glaciological Service (SGL) started to survey the hanging. In May 2005 a measurement system was set up to check ice surface velocities , serac volume and shape changes and to try in forecasting the moment of the ice-fall. The instruments used for surveying the serac changes were a laser scanner (Riegl LMS-Z420i equipped with a Nikon D100 camera) and a total station (Leica Wilde T 1000); the first one was used for close-up surveys performed from a mountain top 3200 m high, the second instrument was used to monitor the serac from several measurement points located down-valley (from 2500 to 2900 m a.s.l.). While the laser scanner technique was adopted twice (May and September 2005), as it required the use of the helicopter, the total station measurements were instead performed more frequently from June to September 2005. The laser scanner data permitted to calculate the serac volume which resulted equal to c. 900,000 mˆ3 an to describe its morphology; the total station data allowed to know the displacements of the serac which reached maximum vertical value of c. 10 m and maximum horizontal value of c. 5 m in the period 20th July 2005-14th September 2005. Further deeper analysis of the topographical data collected will permit a better understanding and knowledge of the driving factors responsible for the serac evolution
Brenva Glacier (Mount Blank Group). The contribution of photogrammetry and historic cartography in the study of a debris covered Glacier recent evolution
No full textFirst attempt to classify and inventory local or “alpine” glaciers in Northern Victoria Land (Antarctica).
No full textImpatti inattesi ed accelerati del cambiamento climatico sulla vegetazione alpina e periglaciale
No full textL'articolo illustra i principali impatti del cambiamento climatico sulla vegetazione alpina di alta quota con particolare riferimento agli ambienti proglaciali e periglacial
Dry calving processes at the ice cliff of Strandline Glacier, northern Victoria Land, Antarctica
Full text linkThis paper describes seasonal variations on Strandline Glacier, Terra Nova Bay, northern Victoria Land, Antarctica, obtained from measurements during two field campaigns (2000/01 and 2002/03). By applying different methodologies and techniques, it was possible to calculate summer changes in thickness (mean decrease over the whole glacier surface of 0.04 m w.e.) and in volume (decrease of 352 m(3) at the terminus). This serves to identify and quantify the processes responsible for these variations (e.g. melting, evaporation, wind erosion/deposition and calving) and to understand the energy transfers at the glacier-air interface. One particular feature of the glacier is the presence of an ice cliff at the terminus, which causes ablation owing to dry calving. This process brought about a summer retreat rate of 1 m week(-1) in the central part of the front during the study period. Qualitative observations carried out during previous field campaigns and quantitative analysis performed during the last two expeditions have provided an understanding of the mechanism underlying the ablation processes, thus confirming the available literature on this topic
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