Fig. 6

Scatterplots of terrestrial-derived FDOM (C2) (R.U) versus (a,b) spectral slope of chromophoric DOM between 275 and 295 nm (S275–295) (nm–1), (c,d) river water fraction (friver), and (e, f) sea ice meltwater fraction (fsim), in the surface waters (< 50 m) of the Chukchi Borderland (CBL) (left panels) and the East Siberian Sea (ESS) during the summers of 2019 (red) and 2022 (blue).