Fig. 3: Irradiance spectra in ice-covered versus open ocean water.
From: Loss of sea ice alters light spectra for aquatic photosynthesis
The graphs show scalar irradiance spectra predicted by the model for (a, c) ice-covered water with an ice thickness of 1 m, and (b, d) open water without ice cover. In (a, b), irradiance spectra are compared at the same physical depths. In (c, d), irradiance spectra are compared at the same optical depths (20%, 10%, 5%, 2%, and 1% of the incident solar irradiance). Gray lines indicate spectra in sea ice, while blue lines indicate spectra in water below the sea ice and in open water. All four panels assume the same incident solar irradiance spectrum (Supplementary Fig. S2) and the same parameter values (Supplementary Table S2), with very low concentrations of colored dissolved organic matter (CDOM) and non-algal particles (NAP) representative of the oligotrophic ocean (light absorption by CDOM and NAP at 440 nm is aCDOM(440) = 0.01 m−1; aNAP(440) = 0.001 m−1). The only difference between the panels is the ice cover.
