An optical water classification and quality control model (OC_QC model) for spectral diffuse attenuation coefficient

Spectral diffuse attenuation coefficient of down-welling irradiance (Kd(λ)) is a fundamental optical parameter for water color and significance heat budget calculation, photosynthesis modeling carbon sequestration. Uncertainties exist in both situ measured satellite derived Kd(λ), therefore, evaluation its data quality essential. In addition, classification Kd(λ) still limited. To address these issues, we proposed an control model (OC_QC model) based on globally collected high-quality data. The consists the reference spectra 7 types (OWT, ranging from clear open ocean to highly turbid water) scoring system. An individual spectrum can be assigned OWT score (QC score) with this model. performance OC_QC tested independent coastal (Bohai Sea) oceanic (Indian Ocean). Questionable or erroneous identified, suggesting model’s robustness. was also evaluated Medium Resolution Imaging Spectrometer (MERIS) Level-2 Moderate Spectroradiometer (MODIS) Level-3 Bohai Sea, Yellow East China Sea South Sea. Satellite maps clearly showed spatial temporal variations OWTs QC scores, regions low-quality were reasonably extracted. Global Kd(λ)-based corresponding scores obtained With controlled data, retrieval accuracy Secchi disk depth improved. accuracies Chlorophyll-a concentration total seawater absorption improved algorithms. would valuable evaluating (especially operational global products), investigation properties, development merging bio-optical