The variability of dissolved (organic and inorganic) carbon and optical characteristics of dissolved organic matter (DOM) in the main stems of the Great Siberian rivers (Ob and Lena) during the summer season was studied. It has been established that in the observed spatial variability of the studied parameters in the river main stem, along with landscape-geographical features of the catchment area, the riverine hydrograph has the most important role. Phase of the river runoff may differ significantly in different river sections during the same period, largely causing quantitative and qualitative variations in the composition of the DOM as well as dissolved carbon concentrations.
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