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It has been presented in this study, the evaluation of remote sensing reflectance (R rs ) derived from the atmospheric correction of Moderate Resolution Imaging Spectroradiometer (MODIS) aboard Aqua satellite. A switching algorithm was developed for the atmospheric correction. The evaluation shows that MODIS measured R rs at visible bands compare reasonably well with in situ R rs , with the mean ratios ranging from 0.955 to 1.374. The spatiotemporal variation of R rs in Bohai sea is characterized using MODIS data from July 2002 to June 2014. It is noted from the time series of monthly mean R rs and wind speed a time lag for the response of Rrs to wind. Significant linear relationship is found between the monthly mean R rs and wind speed, with the correlation coefficients much higher than those between the annual mean R rs and total river discharge, indicating that wind plays a more important role than river discharge in determining the variation of R rs in Bohai sea. Strong seasonal variation is observed in the monthly mean R rs , which is the lowest during July and August and increases to the maximum in January-February and then decreases. Using the entire archive of MODIS/Aqua data over Bohai sea, this study documents the apparent optical properties which serve as an indicator of sediment transport, providing a low-cost and efficient way for monitoring the marine environmental change and for demonstrating the effect from sediment transport on coastal morphology and ecosystem.
Zhang et al. (Tue,) studied this question.