> For the complete documentation index, see [llms.txt](https://swatplus.gitbook.io/io-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://swatplus.gitbook.io/io-docs/theoretical-documentation/section-7-main-channel-processes/in-stream-nutrient-processes/algae/chlorophyll-a.md).

# 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).