Chlorophyll-a concentration inversion based on the modified Quasi-Analytical Algorithm and Sentinel-3 OLCI in Daihai Lake, China
The Quasi-Analytical Algorithm (QAA) is effective in retrieving water inherent optical properties (IOPs) from remote sensing spectral reflectance and has wider applications in studies of the open ocean and coastal waters than of inland waters. This research aimed to modify the QAA model based on mea...
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| Format: | Article |
| Language: | English |
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IWA Publishing
2022-03-01
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| Series: | Water Supply |
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| Online Access: | http://ws.iwaponline.com/content/22/3/2959 |
| _version_ | 1818261885296836608 |
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| author | Zhao Lu Huajie Duan Daqing Wang Jianwu Cao Guoli Du Zhengdong Deng Guangyuan Wang Haoli Xu Xiaoning Zhao Yue Shi |
| author_facet | Zhao Lu Huajie Duan Daqing Wang Jianwu Cao Guoli Du Zhengdong Deng Guangyuan Wang Haoli Xu Xiaoning Zhao Yue Shi |
| author_sort | Zhao Lu |
| collection | DOAJ |
| description | The Quasi-Analytical Algorithm (QAA) is effective in retrieving water inherent optical properties (IOPs) from remote sensing spectral reflectance and has wider applications in studies of the open ocean and coastal waters than of inland waters. This research aimed to modify the QAA model based on measured field spectral reflectance and absorption coefficients to render it applicable to studies of Daihai Lake, China. The improvements mainly included the reference wavelength selection, the power index of the particle backscattering coefficient and the exponential slope of the absorption coefficient of the colored detrital matter estimation. The average relative error between the inverse and measured absorption coefficients was less than 20%. A linear model was established between the phytoplankton absorption coefficient at a wavelength of 674 nm (aph(674)) and the chlorophyll-a (Chl-a) concentration, with a determination coefficient of 0.88. Additionally, the modified Quasi-Analytical Algorithm (MQAA) model was applied to the Ocean and Land Color Instrument (OLCI) data aboard the Sentinel-3 satellite. Finally, a spatial distribution map for the Chl-a concentrations in Daihai Lake on August 10, 2017, was drawn and the mid-eutrophication area was found to occur in the north and border. HIGHLIGHTS
The quasi-analytical algorithm (QAA) is modified to MQAA.;
The MQAA is useful in application to OLCI data for chlorophyll-a concentration retrieval.;
The application of MQAA in Daihai is targeted.; |
| first_indexed | 2024-12-12T18:54:20Z |
| format | Article |
| id | doaj.art-9845eabfc1fb4443826275e1205927ad |
| institution | Directory Open Access Journal |
| issn | 1606-9749 1607-0798 |
| language | English |
| last_indexed | 2024-12-12T18:54:20Z |
| publishDate | 2022-03-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Supply |
| spelling | doaj.art-9845eabfc1fb4443826275e1205927ad2022-12-22T00:15:16ZengIWA PublishingWater Supply1606-97491607-07982022-03-012232959297610.2166/ws.2021.420420Chlorophyll-a concentration inversion based on the modified Quasi-Analytical Algorithm and Sentinel-3 OLCI in Daihai Lake, ChinaZhao Lu0Huajie Duan1Daqing Wang2Jianwu Cao3Guoli Du4Zhengdong Deng5Guangyuan Wang6Haoli Xu7Xiaoning Zhao8Yue Shi9 Army Engineering University of PLA, Nanjing 210007, China Research Institute for National Defence Engineering of PLA Academy of Military Science, Beijing 100850, China Army Engineering University of PLA, Nanjing 210007, China Research Institute for National Defence Engineering of PLA Academy of Military Science, Beijing 100850, China Research Institute for National Defence Engineering of PLA Academy of Military Science, Beijing 100850, China Army Engineering University of PLA, Nanjing 210007, China Army Engineering University of PLA, Nanjing 210007, China Army Engineering University of PLA, Nanjing 210007, China Army Engineering University of PLA, Nanjing 210007, China Army Engineering University of PLA, Nanjing 210007, China The Quasi-Analytical Algorithm (QAA) is effective in retrieving water inherent optical properties (IOPs) from remote sensing spectral reflectance and has wider applications in studies of the open ocean and coastal waters than of inland waters. This research aimed to modify the QAA model based on measured field spectral reflectance and absorption coefficients to render it applicable to studies of Daihai Lake, China. The improvements mainly included the reference wavelength selection, the power index of the particle backscattering coefficient and the exponential slope of the absorption coefficient of the colored detrital matter estimation. The average relative error between the inverse and measured absorption coefficients was less than 20%. A linear model was established between the phytoplankton absorption coefficient at a wavelength of 674 nm (aph(674)) and the chlorophyll-a (Chl-a) concentration, with a determination coefficient of 0.88. Additionally, the modified Quasi-Analytical Algorithm (MQAA) model was applied to the Ocean and Land Color Instrument (OLCI) data aboard the Sentinel-3 satellite. Finally, a spatial distribution map for the Chl-a concentrations in Daihai Lake on August 10, 2017, was drawn and the mid-eutrophication area was found to occur in the north and border. HIGHLIGHTS The quasi-analytical algorithm (QAA) is modified to MQAA.; The MQAA is useful in application to OLCI data for chlorophyll-a concentration retrieval.; The application of MQAA in Daihai is targeted.;http://ws.iwaponline.com/content/22/3/2959chlorophyll-ainherent optical propertiesmodified quasi-analytical algorithmremote sensingsentinel-3 olci |
| spellingShingle | Zhao Lu Huajie Duan Daqing Wang Jianwu Cao Guoli Du Zhengdong Deng Guangyuan Wang Haoli Xu Xiaoning Zhao Yue Shi Chlorophyll-a concentration inversion based on the modified Quasi-Analytical Algorithm and Sentinel-3 OLCI in Daihai Lake, China Water Supply chlorophyll-a inherent optical properties modified quasi-analytical algorithm remote sensing sentinel-3 olci |
| title | Chlorophyll-a concentration inversion based on the modified Quasi-Analytical Algorithm and Sentinel-3 OLCI in Daihai Lake, China |
| title_full | Chlorophyll-a concentration inversion based on the modified Quasi-Analytical Algorithm and Sentinel-3 OLCI in Daihai Lake, China |
| title_fullStr | Chlorophyll-a concentration inversion based on the modified Quasi-Analytical Algorithm and Sentinel-3 OLCI in Daihai Lake, China |
| title_full_unstemmed | Chlorophyll-a concentration inversion based on the modified Quasi-Analytical Algorithm and Sentinel-3 OLCI in Daihai Lake, China |
| title_short | Chlorophyll-a concentration inversion based on the modified Quasi-Analytical Algorithm and Sentinel-3 OLCI in Daihai Lake, China |
| title_sort | chlorophyll a concentration inversion based on the modified quasi analytical algorithm and sentinel 3 olci in daihai lake china |
| topic | chlorophyll-a inherent optical properties modified quasi-analytical algorithm remote sensing sentinel-3 olci |
| url | http://ws.iwaponline.com/content/22/3/2959 |
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