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An Improved Inherent Optical Properties Data Processing System for Residual Error Correction in Turbid Natural Waters
oleh: Jun Chen, Wenting Quan, Hongtao Duan, Qianguo Xing, Na Xu
| Format: | Article |
|---|---|
| Diterbitkan: | IEEE 2021-01-01 |
Deskripsi
Being able to accurately estimate inherent optical properties (IOPs) at long time scales is key to comprehending the aquatic biological and biogeochemical responses to long-term global climate change. We employed the near-infrared band and combined it with four “common bands” at visible wavelengths (around 443, 490, 551, and 670 nm) to adjust the IOPs data processing system, IDAS<sub>v2</sub>. We applied the IDAS<sub>v2</sub> algorithm further to correct for the residual error in images of turbid waters. We evaluated the performance of the IDAS<sub>v2</sub> algorithm using datasets covering a wide range of natural water types from clear open ocean to turbid coastal and inland waters. Due to the water-leaving signals’ sensitivity to the optically significant constituents of highly turbid waters, the near-infrared band was very important for retrieving IOPs from those waters. In our analysis, we found that the IDAS<sub>v2</sub> algorithm provided IOPs data with <28.36% uncertainty for oceanic waters and <37.83% uncertainty for inland waters, which was much more effective than what a quasi-analytical algorithm provided. Moreover, the near-infrared band was better at removing the residual error and partial intermission bias in satellite remote sensing reflectance (<italic>R</italic><sub>rs</sub>) data because of the strong absorption of pure water. We tested the IDAS<sub>v2</sub> algorithm with numerically simulated and satellite observed data of turbid water. After applying IDAS<sub>v2</sub>, the IOPs data were accurately determined from <italic>R</italic><sub>rs</sub> data contaminated by the residual error. Furthermore, the mean intermission difference between Medium Resolution Spectral Imager 2 and Visible Infrared Imaging Radiometer <italic>R</italic><sub>rs</sub> data at 443 and 551 nm decreased from 8%–25% to 1%–9%. These results suggest that we can accurately estimate IOPs data for natural waters including naturally clear and turbid waters.