Productivity of outdoor algal cultures in unstable weather conditions

In the outdoor cyclic fed batch cultures of Chlorella pyrenoidosa , some typical growth kinetics patterns in unstable weather conditions were observed. On cloudy days, the biomass output rate ( R ) was low, but the bioenergetic growth yield ( Y ) was generally high. In the cloudy morning‐sunny afternoon condition, the values of Y were low, especially in the afternoon. In the sunny morning‐cloudy afternoon condition, both R and Y were high. A few very high short‐term Y values were measured during the cloudy the cloudy afternoon. © 1993 Wiley & Sons, Inc.