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• W4313593222 endingPage "119540" @default.
• W4313593222 startingPage "119540" @default.
• W4313593222 abstract "The pollution or eutrophication affected by dissolved organic matter (DOM) composition and sources of inland waters had attracted concerns from the public and government in China. Combined with remote sensing techniques, the fluorescent DOM (FDOM) parameters accounted for the important part of optical constituent as chromophoric dissolved organic matter (CDOM) was a useful tool to trace relative DOM sources and assess the trophic states for large-scale regions comprehensively and timely. Here, the objective of this research is to calibrate and validate a general model based on Landsat 8 OLI product embedded in Google Earth Engine (GEE) for deriving humification index (HIX) based on EEMs in lakes across China. The Landsat surface reflectance was matched with 1150 pairs fieldtrip samples and the nine sensitive spectral variables with good correlation with HIX were selected as the inputs in machine learning methods. The calibration of XGBoost model (R2 = 0.86, RMSE = 0.29) outperformed other models. Our results indicated that the entire dataset of HIX has a strong association with Landsat reflectance, yielding low root mean square error between measured and predicted HIX (R2 = 0.81, RMSE = 0.42) for lakes in China. Finally, the optimal XGBoost model was used to calculate the spatial distribution of HIX of 2015 and 2020 in typical lakes selected from the Report on the State of the Ecology and Environment in China. The significant decreasing of HIX from 2015 to 2020 with trophic states showed positive control of humification level of lakes based on the published document of Action plan for prevention and control of water pollution in 2015 of China. The calibrated model would greatly facilitate FDOM monitoring in lakes, and provide indicators for relative DOM sources to evaluate the impact of water protection measures or human disturbance effect from Covid-19 lockdown, and offer the government supervision to improve the water quality management for lake ecosystems." @default.
• W4313593222 created "2023-01-06" @default.
• W4313593222 creator A5005673657 @default.
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• W4313593222 date "2023-02-01" @default.
• W4313593222 modified "2023-10-09" @default.
• W4313593222 title "Remote sensing of fluorescent humification levels and its potential environmental linkages in lakes across China" @default.
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• W4313593222 doi "https://doi.org/10.1016/j.watres.2022.119540" @default.
• W4313593222 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36608522" @default.
• W4313593222 hasPublicationYear "2023" @default.
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