Measurements at the mid-lake station, south of Stateline, show much more variance throughout the year. Similar ratios were found there in December. Yet in June, it appears that the ratio reverses with mineral particles becoming dominant. Also, particle concentrations were greater at the mid-lake location. Here's how Ted Swift and his associates describe the optical effects of particles and algae in the lake.
Pure water absorbs light in the red portion of the spectrum, and scatters very little light.
The result is a bright blue color. Mineral particles scatter more blue light than red. So sediment laden water appears reddish-brown. Algal particles scatter some light, but mostly they strongly absorb red and blue light. This is because algae grow by absorbing light and carbon dioxide and producing green chlorophyll.