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Master thesis

Annual dissolved organic carbon dynamics in a boreal landscape

Abstract : This preliminary study, conducted in southern Finland, monitored dissolved organic concentrations (DOC) over 4 years, to observe temporal and spatial variations within a boreal drainage lake catchment. The mean annual export ranged between 8.7 g C m-2.yr-1 and 17.4 g C m-2.yr-1 in the inlet and the outlet respectively. Despite the extensive research%on% this subject, a lot is still unknown about what influence mostly organic carbon concentrations in inland waters. It reveals that DOC variations are driven by parameters differing with the season considered, and the location. Spring snowmelt, the most important hydrological event in northern latitudes, accounts for 38 to 42% of the annual discharge in Huikonjoki and Saarijärvenpuro respectively and is linked to a significant DOC export (48%). Whereas, summertime and snow cover period exports, at base flow condition, realize only a part of 25%. Our results suggested that DOC concentrations and export are mainly driven by hydrology, implying a positive correlation between discharge and DOC. Differences across studies were explained by wetland coverage, and particularly by the different flowpath in spodosols and histosols.
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Master thesis
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http://docnum.univ-lorraine.fr/public/BUS_M_2014_GERARDIN_MARIE.pdf
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Marie Gérardin. Annual dissolved organic carbon dynamics in a boreal landscape. Earth Sciences. 2014. ⟨hal-01841071⟩

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