Effect of instrument tilts on in-water radiometric profile measurements and data analysis

Using the coupled ocean and atmosphere radiative transfer code (COART), the downward radiance distributions above the sea surface and at 1 m depth in the water are calculated. Combined with the discrete angle numerical model, the investigation of effect of instrument tilts on Ed, Es and Lu is provided. It is found that the average of the time series Esdata will be to eliminate the effect of the tilt of surface incident irradiance instrument caused by the rocked boat. And different high tilt thresholds should be set respectively for Ed and Lu to flag invalid data records.