Abstract
We conducted a field study on light conditions in a small boreal Karelian Lake Vendyurskoe over two years. Albedo of ice-covered lake varied from 0.9 to 0.1, and the euphotic zone depth exceeded 3.5 m during the melting stage. The Secchi disc depth changed from 2.5 m after ice-break to 3.7 m at the stage of early summer. The vertical distribution of the photosynthetically active solar radiation (PAR) attenuation coefficient for water Kw was characterized by high spatial (vertical) and temporal (seasonal and interannual) variability which can be connected with the dynamics of plankton cells. The highest values of Kw eached 2–2.8 m–1 in the upper 0.5 m layer of a water column, and decreased to 0.5–1.5 m–1 with increasing depth. The highest values of Kw were marked in the end of ice-covered period.
Highlights
Solar radiation is one of the most important parameters in functioning of the lake ecosystem
Parameterization of attenuation of the solar radiation within icecovered lakes is an important task of modern physical limnology
Measurements of solar radiation fluxes at the surface of snow-ice cover and photosynthetically active solar radiation (PAR)-fluxes into a water column were conducted on [21,22,23,24] April 2013 and [26,27,28,29,30,31] March 2014 when the radiatively-driven convection under ice was in progress
Summary
Solar radiation is one of the most important parameters in functioning of the lake ecosystem. Radiative heating of water, spring under-ice convection, photosynthesis, the daily activity of the plankton and fish community – all of these processes are determined by the flux of solar radiation penetrating into a water column [Zaneveld et al, 1981; Mironov & Terzhevik, 2000; Mironov et al, 2002; Reynolds, 2006]. Snow-ice cover, high water color and turbidity, and large concentrations of phytoplankton in the surface layers of the reservoir are the key factors that limit the penetration of solar radiation into a water column [Chekhin, 1987; Arst et al, 2008]. The attenuation of the solar flux within the snow-ice cover has been studied quite well [Petrov et al, 2005; Arst et al, 2006, 2008; Lei et al, 2011; Zdorovennova et al, 2013]. Parameterization of attenuation of the solar radiation within icecovered lakes is an important task of modern physical limnology
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