Fig. 4: Irradiance spectra below sea ice and in open water, predicted for three marine ecosystems.
From: Loss of sea ice alters light spectra for aquatic photosynthesis
The graphs show model predictions of scalar irradiance spectra (a–c) directly under the ice (gray lines) and (d–f) in open water (colored lines). The results are shown for three concentrations of colored dissolved organic matter (CDOM), representative for the oligotrophic ocean (left column), mesotrophic ocean (middle column), and eutrophic coastal waters (right column) (aCDOM(440) is light absorption by CDOM at 440 nm). In each panel, irradiance spectra are shown at the same four optical depths (25%, 15%, 5%, and 1% of the incident irradiance). The associated physical depths (in meters) are also indicated, where the physical depth represents the thickness of the ice in (a–c) and the depth in the water column in (d–f). The incident solar irradiance spectrum is the same in all panels (see Supplementary Fig. S2), and parameter settings are summarized in Supplementary Table S2.
