Keywords: Absorption coefficient, colored dissolved organic matter at 254 nm; Absorption coefficient, colored dissolved organic matter at 260 nm; Absorption coefficient, colored dissolved organic matter at 350 nm; Absorption coefficient, colored dissolved organic matter at 375 nm; Absorption coefficient, colored dissolved organic matter at 400 nm; Absorption coefficient, colored dissolved organic matter at 412 nm; Absorption coefficient, colored dissolved organic matter at 440 nm; Absorption coefficient, colored dissolved organic matter at 443 nm; AWI_Envi; AWI_Perma; AWI Arctic Land Expedition; Date/Time of event; DEPTH, water; Event label; Latitude of event; LD14_01; LD14_02; LD14_03; LD14_04; LD14_05; LD14_06; LD14_07; LD14_08; LD14_09; LD14_10; LD14_11; LD14_12; LD14_13; LD14_14; LD14_15; LD14_16; LD14_19; LD14_24; LD14_36; LD14_37; LD14_41; LD14_42; LD14_44; LD14_52; LD14_53; LD14_54; LD14_A_15; LD14_A_24; LD14_A_55; LD14_A_56; LD14_A_57; LD14_B_20; LD14_B_27; LD14_T_10; LD14_T_11; LD14_T_12; Location of event; Longitude of event; Main Channel, Lena Delta, Siberia, Russia; MULT; Multiple investigations; Olenekskaya Channel, Lena Delta, Siberia, Russia; Permafrost Research; Polar Terrestrial Environmental Systems @ AWI; RU-Land_2014_Lena; Sardakhskaya Channel, Lena Delta, Siberia, Russia; Small Channel, Lena Delta, Siberia, Russia; SOB14_A_10; SOB14_A_11; SOB14_A_53; Spectral slope of colored dissolved organic matter absorption, 275-295 nm; Spectral slope of colored dissolved organic matter absorption, 300-500 nm; Spectral slope of colored dissolved organic matter absorption, 350-400 nm; Spectral slope of colored dissolved organic matter absorption ratio