Depth Profile Of Temperature (°C), salinity (psu), fluorescence (equivalent to chlorophyll a), and dissolved oxygen (mg/L) concentrations at Station 9 (May 27). Two lines of similar colors for each parameter are due to downcast and upcast, respectively. Note there is a background value of fluorescence ~ 0.5 is likely reflecting other materials such as colored dissolved organic matter (CDOM), not chlorophyll.