Diurnal behavior of the flux and partial pressure of carbon dioxide in the surface water in “solar time” coordinates (the period of open water in littoral of the South Baikal in 2004-2015)
D.A. Pestunov1,2, A.M. Shamrin1, V.M. Domysheva3, M.V. Sakirko3, M.V. Panchenko1
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
2National Research Tomsk Polytechnic University, 30, Lenin Avenue, Tomsk, 634050, Russia
3Limnological Institute of the Siberian Branch of the RAS, 3, Ulan-Batorskaya str., 664033, Irkutsk, Russia
Keywords: углекислый газ, парциальное давление, поток, инсоляция, суточный ход, фотосинтез, деструкция, планктон, оз. Байкал, carbon dioxide, partial pressure, flux, solar radiation, diurnal variation, photosynthesis, destruction, plankton, Lake Baikal
Abstract
The long-term series of regular measurements of the carbon dioxide concentration in the surface water and СО2 fluxes in the littoral zone of Lake Baikal has shown that diurnal variations are observed during all open-water period (May through December), which are related to the processes of photosynthetic activity of plankton. In order to isolate the role of photoperiodic process on the background of the effect of many factors of different nature on the change of the concentration of carbon dioxide in the surface water and its fluxes in the atmosphere - water system, the scheme of diurnal behavior of the concentration and fluxes of CO2 in the littoral zone of Southern Baikal in 2004-2015 is considered in the coordinates of the sunshine duration. It was calculated on the basis of theoretically possible sunshine duration (from sunrise until sunset under cloudless sky and open horizon conditions). The proposed parameterization algorithm for retrieval of the values of these characteristics for any time moment can be used in the models of the carbon dioxide cycle and will be useful for planning the study of biological and chemical processes in Lake Baikal.
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