Birgean heat budgets and rates of heat uptake in two monomictic lakes

Loranger, Thomas J.; Brakke, David

doi:10.1007/bf00015475

Cited by 6 publications

(1 citation statement)

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“…4, Table 1) are consistent with monitoring and models that show that differences in lake morphometry influence variations in thermal properties (Robertson and Ragotzkie 1990), heat uptake (Loranger and Brakke 1988), spring warming (Straskraba 1985), and timing of CWP (Straile and Adrian 2000). These morphometric controls may be particularly pronounced in polymictic Qu'Appelle lakes where the absence of thermal stratification allows water to heat relatively uniformly in each basin.…”

Section: Discussionsupporting

confidence: 68%

Climate control of the spring clear‐water phase through the transfer of energy and mass to lakes

Dröscher

Patoine

Finlay

et al. 2009

Limnology & Oceanography

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We analyzed decade-long time series of water transparency, algal abundance, zooplankton density, heat income, hydrology, and climate from six polymictic lakes of the northern Great Plains to determine how energy and mass transfers interact to regulate lake structure during the spring clear-water phase (CWP). Timing (date of occurrence) and intensity (Secchi transparency) of CWP were highly variable among lakes (mean lake-pair synchrony, S 5 0.072, p 5 0.53); however, CWP occurred in all lakes when water overlying the sediments reached 16.1uC 6 3.7uC and Daphnia cleared the water column of diatoms. At a decadal resolution, timing and intensity of CWP were correlated strongly and positively (r 2 . 0.90, p , 0.05) with the net heat income (h) and lake volume, but not with other independent lake, catchment, or climate features. Instead, at an annual resolution, the strength of correlations between CWP characteristics and heat income (r CWP-h ) was itself correlated inversely with the winter index of the North Atlantic Oscillation (r , 20.55, p , 0.05) and with precipitation during FebruaryApril (r , 20.675, p , 0.05). We conclude that the transfer of energy interacts with lake volume to regulate differences in timing and intensity of CWP among lakes, whereas the transfer of mass overrides energetic regulation to introduce temporal variation in CWP characteristics among years.

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Section: Discussionsupporting

confidence: 68%