Duguay, Claude R.

17 items:

Recent trends in Canadian lake ice cover Recent studies have shown that ice duration in lakes and rivers over the Northern Hemisphere has decreased over the 19th and 20th centuries in response to global warming. However, lake ice trends have not been well documented in Canada. Because of its size, considerable variability may exist in both freeze-up and break-up dates across the country. In this paper, results of the analysis of recent trends (1951-2000) in freeze-up and break-up dates across Canada are presented. Trends toward earlier break-up dates are observed for most lakes during the time periods of analysis which encompass the 1990s. Freeze-up dates, on the other hand, show few significant trends and a low degree of temporal coherence when compared... Categories: Data, Publication; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: M1-Changes in Plant and Animal Distributon, P2-Changes in Plant and Animal Species Due to Climate Change
Holocene Evolution of Lakes in the Bluefish Basin, Northern Yukon, Canada RÉSUMÉ. La présente étude retrace l'évolution des lacs de l'Holocène situés dans le bassin Bluefish, dans le nord du Yukon. Elle s'appuie sur la lithologie des lacs, la répartition des macrofossiles de plantes et la datation par le radiocarbone des matières organiques de base se trouvant dans les carottes de sédiments provenant d'anciens bassins lacustres. La datation par le radiocarbone de la matière organique de base d'anciens bassins lacustres fait remonter cette matière à l'Holocène supérieur (< 3 770 ans avant le présent), tandis que la datation par le radiocarbone des plateaux de tourbe polygonaux (~2 m d'épaisseur) qui entourent la plus grande partie du groupement d'anciens bassins lacustres remonte à l'Holocène... Categories: Publication; Types: Citation; Tags: P2-Changes in Plant and Animal Species Due to Climate Change
Contemporary (1951-2001) Evolution of Lakes in the Old Crow Basin, Northern Yukon, Canada: Remote Sensing, Numerical Modeling, and Stable Isotope Analysis Categories: Publication; Types: Citation; Tags: M1-Changes in Plant and Animal Distributon, M1-Ecosystems, M2-Standardized Stream and Lake Information
Ice-cover variability on shallow lakes at high latitudes: model simulations and observations A one-dimensional thermodynamic model for simulating lake-ice phenology is presented and evaluated. The model can be driven with observed daily or hourly atmospheric forcing of air temperature, relative humidity, wind speed, cloud amount and snowfall. In addition to computing the energy balance components, key model output includes the temperature profile at an arbitrary number of levels within the ice/snow (or the water temperature if there is no ice) and ice thickness (clear ice and snow-ice) on a daily basis, as well as freeze-up and break-up dates. The lake-ice model is used to simulate ice-growth processes on shallow lakes in arctic, sub-arctic, and high-boreal forest environments. Model output is compared... Categories: Publication; Types: Citation; Tags: B1-High Resolution Land Cover Imaging, M2-Standardized stream and lake information-1
Contemporary (1951-2001) Evolution of Lakes in the Old Crow Basin, Northern Yukon, Canada: Remote Sensing, Numerical Modeling, and Stable Isotope Analysis Categories: Data, Publication; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Monitoring 1-Changes in Plant and Animal Distribution: Ecosystems, Monitoring 2-Standardized Stream and Lake Information

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