Photoproduction of dissolved inorganic carbon in temperate and tropical lakes – dependence on wavelength band and dissolved organic carbon concentration
作者： Wilhelm Granéli* , Måns Lindell , Bias Marçal de Faria , Francisco de Assis Esteves
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摘要: We have evaluated photoeffects of UV-B, UV-A and PAR radiation on dissolved organic matter (DOM). Photochemical production inorganic carbon (DIC) was measured in sterile lake water from Sweden Brazil after 6 hours sun exposure. Tubes were exposed to four solar regimes: Full-radiation, Full-radiation minus UV-B (PAR) darkness. In both areas, lakes with most DOC (varying between 3 40 mg C l-1) highly humic, resulting high attenuation coefficients (Kd = 5–466 m-1). Under photooxidative DIC-production varied 0.09 1.7 l-1per h, without 0.07 1.4 l-1 only 0.02 0.7 l-1. explains a minor part (17%) the photoooxidative DIC-production, while larger effects (39% 44%, respectively). Photooxidation proportional DOC-content positively related decrease loss absorbance at 250 nm. There no significant difference normalized Swedish Brazilian lakes. The dose during incubations approximately times higher compared Sweden, doses similar. conclude that tropical temperate freshwaters do not seem differ respect sensitivity photooxidation.
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