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Surficial Photosynthetically Available [Active] Radiation; surface irradiance; units vary microEinsteins/meter^2/second or microEinsteins/centimeter^2/second
Surface irradiance (or surface PAR) measured by QSR-2240A sensor. Surface irradiance values were calculated by dividing the net voltage reading by the calibration scale factor of 6.0452 V/(uE/cm^2/sec).