Synoptic and surface climatology interactions in the Central Canadian Subarctic : normal and El Niño seasons
Canada ; Classification ; Cold area ; El Niño ; Evaporation ; Precipitation ; Seasonal variation ; Snow ; Subarctic zone ; Synoptic climatology ; Thematic mapping ; Vegetation dynamics ; Weather type ; Years 1990-99
An objective hybrid classification of daily surface weather maps for Churchill, Manitoba, was used to determine the dominant synoptic conditions during the snowmelt and snow-free periods for the Canadian central subarctic. This classification
yielded different dominant synoptic types for the two normal (1996, 1997) and one El Niño (EN), (1998), seasons. The synoptic patterns that emerged were then related to the precipitation and surface evaporation regimes of a subarctic sedge fen typical
of the northern Hudson Bay Lowland subarctic region.
Landscape scale determinants of periglacial features in Subarctic Finland : a grid-based modelling approach
Cold area ; Finland ; Forecast ; Methodology ; Model ; Palsa ; Periglacial features ; Regression analysis ; Solifluction ; Spatial distribution ; Subarcticarea
The AA. develop and test a methodology to : 1) predict the occurrence of palsas, earth hummocks, sorted solifluction sheets and periglacial deflation sites in a subarctic landscape and 2) determine the most important environmental factors affecting
the distribution of these features at the landscape scale. The study was performed using an empirically-derived data-set of landforms from an area in northern Finland. Logistic regression and hierarchical partitioning were used to analyse the data
and the predictive performance of the models was evaluated using area under the curve (AUC) measures. The results encourage further application of the grid-based modelling approach.
A recent downward expansion of shoreline shrubs at Lake Bienville (subarctic Quebec)
This paper aims to yield evidence, in a large subarctic lake environment, of the intricate relationship between shrub population development and waterlevel fluctuations over the last decades, and to provide a framework for the interpretation
of hydroclimatic variations in an area with strong hydroelectric potential but where instrumental data gauging is lacking.
Arctic Region ; Canada ; Cold area ; Drainage ; Hydrology ; Periglacial features ; Permafrost ; Runoff ; Slope ; Soil moisture ; Subarctic zone ; Thawing
Using data from a subarctic hillslope where detailed hydrological studies were conducted, this paper examines mechanisms of pipe formation with specific reference to cold-region and hydrogeomorphic processes. By providing a theoretical context
and supporting observations, linkages between pipes and other hillslope processes can be placed within the broader context of subarctic permafrost hillslope processes.
Arctic Region ; Coastal environment ; Cold area ; Dune ; Eolian deflation ; Snow ; Subarctic zone ; Vegetation ; Wind
This paper reviews the occurence and morphology of coastal dunes developed in arctic and subarctic environments. The characteristic features of cold-climate coastal aeolian landforms are discussed, and some consideration is given
In a Picea mariana forest near Fort Norman, NWT, a corridor was cleared in the spring of 1985 to simulate a seimic line or pipeline disturbance. Salix arbusculoides was monitored for three growing seasons after canopy harvesting. Leaf area
was not consistent between the three years in either the cleared right-of-way or the undisturbed forest control area. Discussion of the results.
Tree-ring dating of extreme lake levels at the Subarctic-Boreal interface
Atmospheric circulation ; Canada ; Cold area ; Dendrochronology ; Dendrology ; Lake ; Lake level ; Meltwater ; Precipitation ; Quebec ; Snow ; Spring ; Subarcticarea ; Summer ; Twentieth Century
of the arctic front in summer influences the path of the cyclonic air masses, which control summer precipitation and, consequently, summer lake levels in the area.
Impacts of Holocene climatic variations on alluvial fan activity below snowpatches in subarctic Québec
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