inscription
PORTAIL D'INFORMATION GÉOGRAPHIQUE

Résultats de la recherche (1236 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
Periglacial geomorphology and permafrost
  • Periglacial geomorphology and permafrost
  • Bibliographie ; Géographie physique ; Permafrost ; Périglaciaire ; Zone froide
Determination of permafrost thickness in wells in northern Canada
  • Determination of permafrost thickness in wells in northern Canada
  • Canada ; Canada, nord ; Epaisseur ; Géographie de l'Amérique ; Permafrost ; Périglaciaire
Periglacial geomorphology and permafrost
  • Periglacial geomorphology and permafrost
  • Géographie physique ; Géomorphodynamique ; Permafrost ; Périglaciaire ; Recherche ; Thermokarst
  • Altération cryogénique| relations entre la couche active et le permafrost.
Pleistocenni permafrost na uzemi Ceskoslovenska (Permafrost pléistocène en Tchécoslovaquie)
  • Pleistocenni permafrost na uzemi Ceskoslovenska (Permafrost pléistocène en Tchécoslovaquie)
  • Climat historique ; Géographie de l'Europe ; Permafrost ; Pléistocène ; Périglaciaire ; Quaternaire zones moyennes ; Tchécoslovaquie
  • Permafrost existed as early as the Early Pleistocene. An attempt has been made to calculate its thickness at the basis of computer technique in the Upper Pleniglacial. - (MS)
Permafrost mapping at Schefferville, Québec
  • Permafrost mapping at Schefferville, Québec
  • Banque de données ; Canada ; Cartographie ; Documentation ; Exploitation minière ; Géographie physique ; Permafrost ; Périglaciaire ; Québec ; Système d'information
  • The evolution of the techniques, recent research, and the current model of local permafrost distribution are described, together with the characteristics of the Schefferville environment of particular relevance to local permafrost distribution
  • . Contents of the Schefferville permafrost database are described and some preliminary examples are given concerning outputs from a new Geographic Permafrost Information System.
Permafrost thickness and distribution in Finnish Lapland - Results of geoelectrical soundings
  • Permafrost thickness and distribution in Finnish Lapland - Results of geoelectrical soundings
  • Finlande ; Géographie de l'Europe ; Lapland ; Permafrost ; Périglaciaire ; Sondage géoélectrique ; Zone froide
  • Geoelectrical soundings were carried out in 29 different places in order to find permafrost and to measure its thickness. In most places above timber line a permafrost thickness of 10-50 m was recorded. Permafrost was found at sites with thin snow
  • cover during winter. Here, deflation phenomena on the summits of fjells indicate the occurrence of permafrost. Vegetation type might be a good indicator of permafrost, too. It seems obvious that permafrost exists extensively on fjell summits of northern
Degradation of permafrost in the Xing'anling Mountains, Northeastern China
  • Degradation of permafrost in the Xing'anling Mountains, Northeastern China
  • China ; Climatic warming ; Cold area ; Deforestation ; Degradation ; Mountain ; North-Eastern China ; Periglacial features ; Permafrost
  • This paper reviews the evidence and reasons for permafrost degradation, and offers a preliminary assessment of the present status and the future trends of permafrost conditions within the Xing'anling Mountains. Climate warming and deforestation have
  • led to permafrost degradation as shown by deepening of the active layer, thinning permafrost, rising ground temperatures, expanding taliks and the disappearance of permafrost patches. The present position of the southern limit of permafrost
Zonation and ecology of high mountain permafrost in Scandinavia
  • Zonation and ecology of high mountain permafrost in Scandinavia
  • Arctique ; Ecologie ; Géographie physique ; Jotunheimen ; Kebnekaise ; Montagne ; Norvège ; Permafrost ; Périglaciaire ; Suède
  • Les études de terrain montrent que le permafrost est très répandu dans la haute montagne scandinave. Des zones de permafrost sont définies selon la continuité du phénomène.
Permafrost map of Alaska.
  • Permafrost map of Alaska.
  • Alaska ; Carte ; Carte au 1:2 500 000 ; Carte géomorphologique ; Généralités sur la géographie ; Permafrost ; Périglaciaire ; Zone froide
Periglacial geomorphology and permafrost
  • Periglacial geomorphology and permafrost
  • Chine ; Géographie physique ; Permafrost ; Périglaciaire ; Recherche
Permafrost terminology
  • Permafrost terminology
  • Glaciel ; Géographie physique ; Permafrost ; Terminologie
Resistivity of fossil permafrost patterns in southwestern Ontario
  • Resistivity of fossil permafrost patterns in southwestern Ontario
  • Canada ; Carte ; Géographie de l'Amérique ; Ontario ; Paléoclimatologie ; Paléosol ; Permafrost fossile ; Périglaciaire ; Quaternaire ; Résistivité ; Sol figuré
Traces of ice in caves : evidence of former permafrost in Permafrost.
  • Traces of ice in caves : evidence of former permafrost in Permafrost.
  • Belgique ; Glace de ségrégation ; Géographie physique ; Karst ; Paléoclimatologie ; Permafrost ; Quaternaire ; Remouchamps grotte
  • Dans la grotte de Remouchamps (B), des dépôts meubles possèdent des traces indiscutables de glace de ségrégation, confirmant la présence d'un permafrost profond au cours de la dernière glaciation quaternaire. - (RS)
The mapping of permafrost
  • The mapping of permafrost
  • Canada ; Cartographie thématique ; Généralités sur la géographie ; Permafrost ; Périglaciaire ; Zone froide
  • Considérations sur la manière dont les cartes du permafrost ont été compilées et sur la nature des sources statistiques utilisées. Compte tenu de l'extension du permafrost canadien et du développement du Nord canadien, les cartes du permafrost
Some observations regarding mountain permafrost in the Japanese Alps
  • Some observations regarding mountain permafrost in the Japanese Alps
  • Geophysics ; Japan ; Mountain ; Periglacial features ; Permafrost ; Rock glacier
  • In the early 1970s permafrost was discovered from 2 Japanese volcanoes, Mt. Fuji and Mt. Daisetu, by means of shallow drilling and geophysical sounding. The last 2 decades have encountered a rapid progress in mountain permafrost researches. The most
  • important conclusion is that ice-rich permafrost can move downslope, producing a specific landform called a rock glacier.
Distribution of zonal permafrost landforms with freezing and thawing indices
  • Distribution of zonal permafrost landforms with freezing and thawing indices
  • Géographie physique ; Géomorphodynamique ; Géomorphologie climatique ; Indice climatique ; Indice de dégel ; Indice de gel ; Modelé périglaciaire ; Permafrost continu ; Permafrost discontinu ; Permafrost sporadique ; Périglaciaire
  • In areas with under 50 cm snow cover in winter, the permafrost zones can be defined by freezing indices and thawing indices. The relationship works for Norway, Spitsbergen, Canada and Mongolia, and since these include a very wide range of thermal
  • environments, it is possible to trace the thermal ranges of the various active periglacial landforms. Relationships between zonal permafrost landforms and permafrost zones are emphasized.
Recent contributions to the study of past permafrost
  • Recent contributions to the study of past permafrost
  • Recent adavances in permafrost and periglacial research. Special issue
  • Bibliography ; Europe ; Ice wedge ; Inherited features ; Micromorphology ; Palaeo-environment ; Periglacial features ; Permafrost ; Pleistocene ; Quaternary ; Stratigraphy ; Thermokarst ; United States of America
  • This paper reviews recent literature published between 2002 and 2007, concerning the previous existence of permafrost (past permafrost) that formed during the cold periods of the Pleistocene in the northern mid-latitudes. Some past permafrost
  • continues to be preserved today as relict permafrost in the higher northern latitudes. Given that global climate warming models predict widespread thaw of permafrost in the coming century, it is surprising that little attention has been given to the insights
  • that past and relict permafrost offer as to the nature and duration of permafrost thaw.
Surface and downhole geophysics for permafrost mapping in Ungava, Québec
  • Surface and downhole geophysics for permafrost mapping in Ungava, Québec
  • Canada ; Cartographie ; Géographie physique ; Géophysique ; Permafrost ; Périglaciaire ; Quaternaire ; Québec ; Ungava
  • The main goal of this study is to show applications of geophysics to mapping of permafrost in the discontinuous zone of northern Québec.
Landforms and ground ice as evidence of the source of H2O in permafrost
  • Landforms and ground ice as evidence of the source of H2O in permafrost
  • Arctique ; Canada ; Eau du sol ; Glace du sol ; Glacier rocheux ; Géochimie ; Géographie physique ; Oxygène 18 ; Permafrost ; Périglaciaire ; Tritium
  • This paper summarizes the available evidence for the origin of ice in selected permafrost landforms and in types of ground ice.
Geoecological aspects of episodic permafrost expansion in North Sweden
  • Geoecological aspects of episodic permafrost expansion in North Sweden
  • Biogéographie ; Forêt ; Géo-écologie ; Géographie physique ; Permafrost ; Périglaciaire ; Suède ; Variation climatique
  • This paper reports the formation of new discontinuous permafrost and very late seasonal ground thawing in North Sweden. The results are discussed in a historical perspective and in relation to recent climatic variability.