Canada ; Climatic warming ; Cold area ; Numerical model ; Periglacial features ; Permafrost ; Quebec ; Simulation ; Thawing
This paper shows the effect of thaw settlement on the thermal response of a small permafrost mound in Northern Québec to different scenarios of climate warming, with a finite-element, one-dimensional, heat conduction model. In addition
to the cryostratigraphy of the mound, the unfrozen water content, thermal conductivity and volumetric heat capacity of the marine sediments comprising the mound were integrated in the simulation. Thaw settlement, the direct results of ice melting in permafrost, brings
permafrost nearer to the surface and accelerates its thawing. It should be included in any numerical simulation.
Meteorological control on interannual spatial and temporal variations in snow cover and ground thawing in two northeast greenlandic Circumpolar-Active-Layer-Monitoring (CALM) sites
Active layer ; Arctic Region ; Cold area ; Greenland ; Interannual variability ; Nivation hollow ; Permafrost ; Snow cover ; Spatial variation ; Thawing
Data on snow cover depletion and ground thawing at 2 sites at Zackenberg, in high arctic northeast Greenland, are presented from 1996 to 2002, and their meteorological control discussed.
Evidence for freeze-thaw events and their implications for rock weathering in northern Canada
British Columbia ; Canada ; Chemical erosion ; Cold area ; Experimentation ; Freeze-thaw cycle ; Meltwater ; Temperature ; Weathering
. Temperature data were collected at 1 min intervals for 1 year. These data provide unequivocal proof for the occurrence of the freezing and thawing of water on and within the rock (freeze-thaw events). It was found that the temperature at which freezing occured
Asian part of Russia ; Climatic variation ; Climatic warming ; Fire ; Periglacial features ; Permafrost ; Sakha ; Salinisation ; Thawing ; Thermokarst
, these are insufficient to cause thaw of the underlying icy sediments. Instead, active thermokarst should be regarded as a short-term catastrophic process. Use of the Kudryavtsev algorithm indicates that the depth of thaw beneath a water body in Central Yakutia can reach
Active layer ; Arctic Region ; Cold area ; Model ; Permafrost ; Seasonal variability ; Spatial variation ; Thawing
This paper analyses data from those European Russian CALM sites, primarily with regard to the interannual and spatial variability of the active layer. The effects of organic-layer thickness on thaw depth are shown to change during the warm season.
Active layer ; Asian part of Russia ; Chukotka ; Cold area ; Interannual variability ; Northern Russia ; Permafrost ; Russian Far East ; Seasonal variability ; Spatial variation ; Thawing
criticisms focus on : the implications of trough evolution for cracking behaviour; the extent to which epigenetic, low-centred polygons represent the population of ice-wedge networks; and the modelled initiation of polygons in drained thaw lakes.
of localized thermokarst erosion that would have operated preferentially along ice wedges leading to the development of gullies and tunnels in the near-surface sediments. The local thaw unconformities that result are inferred by the recognition of thermokarst