A semianalytical algorithm for estimating particulate composition in inland waters based on Sentinel-3 OLCI images

被引:8
|
作者
Xu, Jiafeng [1 ]
Zhao, Ying [1 ]
Lyu, Heng [1 ,2 ]
Liu, Huaiqing [1 ]
Dong, Xianzhang [1 ]
Li, Yunmei [1 ,2 ]
Cao, Kai [3 ]
Xu, Jie [4 ]
Li, Yangyang [5 ]
Wang, Huaijing [1 ]
Guo, Honglei [1 ]
机构
[1] Nanjing Normal Univ, Key Lab Virtual Geog Environm, Educ Minist, Nanjing 210023, Peoples R China
[2] Jiangsu Ctr Collaborat Invocat Geog Informat Reso, Nanjing 210023, Peoples R China
[3] East China Normal Univ, Sch Geog Sci, Shanghai 200241, Peoples R China
[4] Minist Ecol Environm, Yangtze River Basin Ecol Environm Monitoring & Sc, Yangtze River Basin Ecol Environm Supervis & Adm, Wuhan 430010, Peoples R China
[5] 3Clear Sci & Technol Co Ltd, Nanjing 210018, Peoples R China
基金
中国国家自然科学基金;
关键词
Optical indicator; Chla/TSM; Remote sensing reflectance; Tempo-spatial variation; Band setting; INHERENT OPTICAL-PROPERTIES; CHLOROPHYLL-A CONCENTRATION; REMOTE ESTIMATION; ATMOSPHERIC CORRECTION; PARTICLE-SIZE; ABSORPTION-COEFFICIENTS; SUSPENDED PARTICLES; AQUATIC PARTICLES; MARINE PARTICLES; LIGHT-ABSORPTION;
D O I
10.1016/j.jhydrol.2022.127617
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The composition of suspended particles is a key factor in determining the underwater light field, which is of great significance for understanding the variability in the optical properties of water bodies. In this study, the ratio of the phytoplankton absorption coefficient to the backscattering coefficient at wavelength of 681 nm (a(ph)(681)/ b(b)(681)) was found to be an optimal optical indicator of the ratio of chlorophyll-a to the total suspended matter concentration (Chla/TSM), a parameter indicating the particulate composition. Therefore, a semianalytical algorithm was proposed to estimate Chla/TSM from remote sensing reflectance (Rrs(lambda)) at 681 nm and 754 nm on Sentinel-3 Ocean and Land Color Instrument (OLCI) images. The validation dataset collected from 11 inland lakes and 3 reservoirs in China and 2 inland lakes in America was used to evaluate the algorithm's performance. The evaluation results demonstrated that the proposed algorithm could have favorable performance in inland waters. Furthermore, comparison with two other state-of-the-art algorithms (Sun_13 and NTD675) showed that this proposed algorithm had higher estimation accuracy, with an overall winning rate (OWR) of 60%, an unbiased mean absolute percentage error (UMAPE) reduction from 72.95% to 46.44%, a root mean square error (RMSE) decline from 1.42 mu g/mg to 0.83 mu g/mg and a normalized root mean square error (NRMSE) decline from 11.36% to 6.62%. This algorithm was successfully applied to acquire the Chla/TSM tempo-spatial variation using the OLCI images of Lake Taihu from 2016 to 2019. It was found that the algorithm developed based on OLCI images can be applied to satellite sensors with similar bands, such as Medium-Resolution Imaging Spectrometer (MERIS), and Sentinel-2 multispectral instrument (MSI), etc. As a simple and effective algorithm, the proposed algorithm has the potential to monitor changes in Chla/TSM in inland waters on a global scale.
引用
收藏
页数:14
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