In Fig. 2, the unit of reflectance should be written as “”, the presented reflectance should be divided by in order to obtain . The surface Fresnel reflection should also be subtracted. The inner diameter of the black bucket is and the inner height is . The height of the water column is . The ASD fore optic was held vertically 30 cm above the water surface with a field of view of 25°, corresponding to a viewable diameter of . Although it is smaller than the inner diameter of the bucket, the wall effect and bottom effect may not be neglected when the SPM concentration is low. The above issues were brought to the authors’ attention by Prof. Zhongping Lee of University of Massachusetts Boston and Applied Optics Topical Editor Prof. Chuanmin Hu. The authors now realized that the data reduction and presentation are not rigorous, for example the neglect of the potential effect of the bucket side and bottom, and the simple assumption of absorption. Therefore, readers are cautioned that the results and conclusions in this article are very preliminary , and a more in-depth analysis is currently underway to improve the results and its interpretation.
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