Chlorophyll a

Chlorophyll $a$ is assumed to be directly proportional to the concentration of phytoplanktonic algal biomass.

$chla=\alpha_0*algae$ 7:3.1.1

where $chla$ is the chlorophyll a concentration (μg chla/L), $\alpha_0$ is the ratio of chlorophyll $a$ to algal biomass (μg chla/mg alg), and $algae$ is the algal biomass concentration (mg alg/L).