PAR measures irradiance -- the amount of sunlight or ambient light that diffuses through water compared to surface light, PAR focuses on the dynamics of the photic zone, typically 1 - 5 meters below the surface and leads to an understanding of photosynthesis, toxic algae blooms and eutrophication (nutrient loading)
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Scientists studying phytoplankton and photosynthesis and measuring chlorophyll need to measure PAR in order to resolve the absorption rate. High levels of PAR can indicate photoinhibition (limiting photosynthesis in shallow water) which affects the submerged aquatic vegetation and certain aquatic species.
YSI measures PAR using single or dual Li-Cor sensors attached to a YSI 6600V2 sonde for continous field monitoring.
Optional wiped PAR is available for long term monitoring in high fouling conditions.
Asymmetrical Mounting System (unattended)
Symmetrical Mounting System (profiling)