Retrieval Of UV Diffuse Attenuation Coefficient With The Remote Sensing Data In The Eastern China Seas

Ultraviolet radiation can directly influence the biology and biological process ofocean surface layer, and plays an important role in the photochemical degradation ofthe ocean, so it is great significance to study of underwater ultraviolet radiationdistribution. Compared to the traditional ship-based campaign, remote sensing datafrom satellites has advantages of high sampling frequency, wide coverage, low cost.At present, the underwater ultraviolet radiation distribution can be calculated bysatellite remote sensing data with known solar ultraviolet radiation reaching on the seasurface and ultraviolet diffuse attenuation coefficient. Hence, it is vital for obtainingunderwater ultraviolet radiation distribution using remote sensing to study ultravioletdiffuse attenuation coefficient.Based on the field data measured in Eastern China Seas, the Multiple LinearRegression(MLR) and Band Ratio retrieval algorithm of the Eastern China Seas wereset up, and the models were tested using the experimental data set. The results showthat both of the two models have reasonable precision, besides, MLR model hashigher correlation and accuracy compared with Band Ratio model. So it can be usedto derive ultraviolet diffuse attenuation coefficient of Eastern China Seas.The remote sensing reflectance from satellite data at sea surface derived by theNIR-SWIR atmospheric correction algorithm was applied to MLR algorithm. Thederived ultraviolet diffuse attenuation coefficient values were compared with in situmeasurements in the Eastern China Seas. The results show that the algorithm has agood applicability in the Eastern China Seas. Based on this result, NIR-SWIRatmospheric correction satellite data from2010to2012was applied to MLR algorithm,and combining with the average algorithm to get3years season average fusionultraviolet diffuse attenuation coefficient data. According to the data, the seasonal andspatial distributions characteristic of diffuse attenuation coefficient in the EasternChina Seas was studied. The results show that ultraviolet diffuse attenuation coefficient of Eastern China Seas present seasonal variation and spatial change feature,and the MLR algorithm are reasonable.