Author:
Welch Harold E.,Legault John A.,Bergmann Martin A.
Abstract
The annual cycles of temperature, ice and snow cover, and light are described for small Saqvaqjuac lakes (63°30′N). Summer thermal stratification occurred but was not persistent. Annual heat budgets were slightly higher than for temperate lakes and increased with increasing mean depth; latent heat of fusion constituted one half to one third of the total heat flow. Ice thickness reached a maximum of 1.6–2.2 m, depending upon winter snow cover, and a thin layer (≈5 cm) of white ice occurred in some years. Ice-out was a partial function of mean June temperature. The open-water season lasted 2–3 ms. Light attenuation through white and candled ice, snow, and water was measured. About 28% of the annual surface irradiance penetrated the unfrozen water, about half that which would have been absorbed under ice-free conditions. Extinction coefficients were inversely correlated with mean depth and positively correlated with nutrient status.
Publisher
Canadian Science Publishing
Subject
Aquatic Science,Ecology, Evolution, Behavior and Systematics
Cited by
34 articles.
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