1. Dissolved organic carbon (DOC) concentration was determined for a range of lakes of varying conductivity (30–4000 μS cm−1) in the low Arctic of SW Greenland. DOC concentration range from 100 mg C L−1, occasionally approaching 200 mg C L−1 in meromictic, oligosaline lakes. DOC concentration was strongly related to [log10] conductivity and total nitrogen. 2. Peak DOC concentrations (>80 mg L−1) occur in lakes located approximately 50 km from the present ice sheet margin, a zone of low effective precipitation; evaporative concentration is the first-order control on DOC concentration. Lakes at the coast and closer to the ice margin had lower DOC concentrations (21 μm−1) and this may reflect increasingly longer lake water residence times, greater DOM age and photochemical degradation.
|Publication status||Published - 2007|