Retrieval of Chlorophyll-a Concentration in Poyang Lake by Using Multi-annual and Simultaneous Satellite-Ground Remote Sensing
Poyang Lake,situated in north-central Jiangxi Province,is the largest freshwater lake in China and con-nects to the Yangtze River.Given its size and location,the lake's water ecological security profoundly impacts the entire Yangtze River basin.Chlorophyll-a concentration serves as a crucial indicator of water ecological eutrophica-tion,underscoring the importance of routine remote sensing monitoring.This study focuses on Poyang Lake,using chlorophyll-a as a proxy for eutrophication.By analyzing six years of observation data(2015-2020)and LandSat images,a retrieval model for summer chlorophyll-a concentration in Poyang Lake was developed.This model em-ploys standard modeling techniques and ensures"satellite-ground"coordination to accurately match data.Through correlation analysis between various wavelength bands and chlorophyll-a concentration,the study constructs a robust retrieval model.Verification with six independent datasets yielded a mean R2 value of 0.86,RMSE of 1.01 μg/L,and MAPE of 17.6％.These results validate the efficacy of the method for chlorophyll-a retrieval in Poyang Lake and suggest its potential application as a reference for long-term monitoring of chlorophyll-a in similar inland ClassⅡ water bodies.
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