Patterns in the spectral composition of sunlight and biologically meaningful spectral photon ratios as affected by atmospheric factors

Kotilainen, Titta; Aphalo, Pedro J.; Brelsford, Craig C.; Böok, H.; Devraj, S.; Heikkilä, A.; Hernández, R.; Kylling, Arve; Lindfors, AV; Robson, T. Matthew