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11 Lake-rich Arctic river deltas are recharged with terrigenous dissolved organic matter 12 (DOM) during the yearly peak water period corresponding with the solstice (24 h d -1 solar 13 irradiance). Bacteria-free DOM collected during peak Mackenzie River discharge was exposed 14 to sunlight for up to 14 d in June 2010. As solar exposure increased, carbon and lignin 15 concentrations declined (10% and 42% respectively after 14 d), as did DOM absorptivity (62% 16 after 14 d), aromaticity, anddoi:10.1139/as-2017-0055 fatcat:ui2drxnozbfovasp3wt32ra4ti