Climatic conditions and sporadicpermafrost in the Maiella Massif (Central Apennines, Italy)
Appennino ; Climatic data ; Italy ; Microclimate ; Mountain ; Periglacial features ; Permafrost
Climatic data were examinated for some ten weather recording stations, in order to verify the presence of favorable conditions for preserving sparadic mountain permafrost in the Maiella Massif (Central Apennines, Italy). Analyzing the situation
it is possible to infer that the bottom temperatures of winter snow cover recorded in the Upper Cannella Valley, where sun irradiation is particularly reduced and wind blows very energetically during the cold period, demonstrate that permafrost can exist even
Dans la vallée de la Bever (Engadine supérieure, Alpes orientale suisse), les AA. ont combiné plusieurs méthodes pour étudier le permafrost : sondage géo-électrique à une dimension, résistance tomographique à deux dimensions, sismique réflexion
, électromagnétisme. De minces lentilles de permafrost ont ainsi été identifiées à une altitude inférieure à celle de la timberline.
Winter ground surface temperature regimes in the zone of sporadic discontinuous permafrost, Tatra Mountains (Poland and Slovakia)
Eastern Europe ; Europe ; Geophysics ; Mountain ; Periglacial features ; Permafrost ; Poland ; Slovak Republic ; Snow cover ; Soil temperature ; Spatial distribution ; Tatra Mountains
Ground surface temperatures in the zone of sporadic discontinuous permafrost in the Tatra Mountains were monitored over 2 winters at sites where either permafrost or deep seasonal frost had been previously posited. The results show that contemporary
permafrost can exist beneath both thick and thin snow covers. The AA. infer that its presence may relate more to local circulation of cold air over the surface and low summer solar irradiation than to elevation and snowpack development.
between discontinuous and sporadicpermafrost lies just on the cold side of 0C MAAT. The sporadicpermafrost zone includes the zone of ice caves and the regions with patches of ice beneath ponds and peatbogs, out to 5C MAAT at a thawing index of 4000
In areas with under 50cm snow cover in winter, the permafrost zones are defined by the freezing indices and thawing indices. The warmer boundary of the zone of continuous permafrost traverses the mean annual air temperature (MAAT). The boundary
Permafrost and ground temperature regimes : a challenging soil classification problem in low arctic and alpine environments
Arctic Region ; Cold area ; Mountain ; Norway ; Pedogenesis ; Permafrost ; Soil ; Soil classification ; Soil temperature ; Sweden ; Taxonomy ; Thermal regime
This paper is an attempt to draw attention to the field problems raised by Soil Taxonomy classification requirements in alpine environments where permafrost is discontinuous or sporadic. It also provides 2 simple illustrations of spatial ground
or sporadicpermafrost.
temperature variability drawn from the Abisko Mountains of northwestern Sweden and the Jotunheimen Mountains of central Norway where ridge crests are probably underlain by permafrost, but valley bottoms are not, and valley flanks may contain discontinuous
Ethiopia ; Freeze-thaw cycle ; Frost action ; Glacial features ; Glaciation ; High mountain ; Mountain ; Periglacial features ; Permafrost ; Pleistocene
host a few localized large relict cryogenic landforms (e.g. stone stripes), suggesting past sporadicpermafrost. A variety of regional factors may have contributed to the more extensive periglacial activity in southern Ethiopia than in the higher Simen
permafrost. Geophysical measurements with electrical resistivity tomography, ground-penetrating radar and seismic refraction indicate the presence of several isolated areas of frozen ground over a full year, far below the regional lower limit of mountain
permafrost. Frozen sediments identified at shallow depths (beneath 1-3 m) were 5-20 m thick and ice-rich. Near-surface temperatures at the foot of the scree slope were strongly influenced by pronounced cooling. Vegetation mapping showed a dominance
Warm permafrost conditions (mean temperatures of −3°C to −0.1°C) were investigated in detail at 13 valley and mountain sites in the sporadic (10–50%) and extensive (50–90%) discontinuous permafrost zones in the southern half of the Yukon (60°N to 64
in the spring imaged both deep seasonal frost and perennially frozen ground. The observations revealed the complexity of site conditions where permafrost is discontinuous and the utility of ERT, in combination with other methods, to investigate permafrost
Cartography ; Cryoturbation ; Finland ; Methodology ; Model ; Periglacial features ; Permafrost ; Solifluction ; Spatial distribution ; Statistical analysis ; Subarctic zone
The AA. assessed the applicability of a boosting method in periglacial distribution modelling using empirically derived data on cryoturbation, sporadicpermafrost and sorted solifluction from an area in sub-Arctic Finland. The results showed
Detection of mountain permafrost by combining high resolution surface and subsurface information - an example from the Glatzbach catchment, Austrian Alps
Alps (The) ; Austria ; Electrical resistivity tomography ; Mountain ; Periglacial features ; Permafrost ; Radiation ; Research technique ; Roughness ; Spatial distribution ; Watershed ; laser measures
in order to understand the effects of surface characteristics on permafrost distribution in the Alpine Glatzbach catchment. Analysis of surface roughness as a proxy for grain size distribution reveals that the lower boundary of discontinuous and sporadic
permafrost is lowered on rough surfaces compared to fine-grain zones. At the same location modelled potential summer solar radiation in coarse grain zones is reduced by up to 40% compared to surfaces of fine grain sizes. The mostly patchy permafrost
Contribution to the study of marine flora and vegetation of N Sporades Islands (Kira Panagia and Piperi), Aegean Sea, Greece
The present contribution has a main goal to describe the marine flora and vegetation of some small rocky isles Nof Alonissos, N Sporades. The research took place in different biotopes at depths ranging from 0-8-10 m in ordre to create a marine park
Active layer ; Arctic Region ; Cold area ; Geophysics ; Ice wedge ; Periglacial features ; Permafrost ; Snow cover ; Soil temperature ; Spatial distribution ; Svalbard
of misinterpretation and offers more reliable results. GPR investigations show that ice wedges are distributed sporadically in lower (younger) beach ridges, but not in higher (older) ones. Inter-site monitoring of ground temperature, soil moisture, slow ground
during the Little Ice Age. At present, debris flow activity is limited to apex sector of talus slopes. Only sporadically debris flows affect a whole slope. - (DG)
The settlement is a social unit manifested also in various spatial units. Investigations of social structure (population number, age structure, school level etc.) have been sporadic in Hungarian human geography, although they reveal how
to the sporadic character and rapid developmental changes in economic geographical events within production systems. In the paper we focus on the geographical distribution of investments and their impacts on regional development. - (L'A.).
In the Lake Guillaume-Delisle area of subarctic Québec, storm-generated alluvial fans have been active sporadically throughout the Holocene. In this study, the AA. propose that the persistence of late-lying snowpatches in fan catchments during
in relation to the erosive process. Destructive effects are directly associated to high energy situations implying sporadic rises in sea-level. On the other hand, defence works influence coastal development by modifying the regional sedimentation balance.
of wastewater flow were monitored. This change is likely to have substantial implication, as the main feature of arid fluvial systems is their ephemeral nature, high magnitude infrequent flow events, and sporadic sediment transport. Within a few months, nutrient