Eutrophication changes in fifty large lakes on the Yangtze Plain of China derived from MERIS and OLCI observations

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Eutrophication changes in fifty large lakes on the Yangtze Plain of China derived from MERIS and OLCI observations. / Guan, Qi; Feng, Lian; Hou, Xuejiao; Schurgers, Guy; Zheng, Yi; Tang, Jing.

I: Remote Sensing of Environment, Bind 246, 111890, 01.09.2020.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

Harvard

Guan, Q, Feng, L, Hou, X, Schurgers, G, Zheng, Y & Tang, J 2020, 'Eutrophication changes in fifty large lakes on the Yangtze Plain of China derived from MERIS and OLCI observations', Remote Sensing of Environment, bind 246, 111890. https://doi.org/10.1016/j.rse.2020.111890

APA

Guan, Q., Feng, L., Hou, X., Schurgers, G., Zheng, Y., & Tang, J. (2020). Eutrophication changes in fifty large lakes on the Yangtze Plain of China derived from MERIS and OLCI observations. Remote Sensing of Environment, 246, [111890]. https://doi.org/10.1016/j.rse.2020.111890

Vancouver

Guan Q, Feng L, Hou X, Schurgers G, Zheng Y, Tang J. Eutrophication changes in fifty large lakes on the Yangtze Plain of China derived from MERIS and OLCI observations. Remote Sensing of Environment. 2020 sep 1;246. 111890. https://doi.org/10.1016/j.rse.2020.111890

Author

Guan, Qi ; Feng, Lian ; Hou, Xuejiao ; Schurgers, Guy ; Zheng, Yi ; Tang, Jing. / Eutrophication changes in fifty large lakes on the Yangtze Plain of China derived from MERIS and OLCI observations. I: Remote Sensing of Environment. 2020 ; Bind 246.

Bibtex

@article{ec1b17147d7d4e1b9e5bf8105e647d1a,
title = "Eutrophication changes in fifty large lakes on the Yangtze Plain of China derived from MERIS and OLCI observations",
abstract = "The eutrophication problems in lakes on the Yangtze Plain of China have attracted global concern. However, a comprehensive assessment of the eutrophication status and its evolution is still lacking for these regional lakes, mostly because of technical difficulties and/or insufficient data to cover the large region. Our study attempts to fill this knowledge gap by using the entire archive of remote sensing images from two satellite ocean color missions (MEdium Resolution Imaging Spectrometer, or MERIS (2003−2011), and Ocean and Land Color Instrument, or OLCI (2017–2018)), together with in situ data on remote sensing reflectance and chlorophyll-a (Chla) concentrations across various lakes on the Yangtze Plain. A machine learning-based piecewise Chla algorithm was developed in this study, with special considerations to improve algorithm performance under lower Chla conditions. Remotely sensed Chla and algal bloom areas were then used to classify the eutrophication status of 50 large lakes on the Yangtze Plain, and the frequent satellite observations enabled us to estimate the probability of eutrophication occurrence (PEO) for each examined lake. The long-term mean Chla ranged from 17.58 mg m−3 to 43.86 mg m−3 on the Yangtze Plain, and severe floating algal blooms were found in 7 lakes. All 50 lakes had high climatological PEO values (50{\%}) during the study period, indicating a generally high probability of eutrophication in lakes on the Yangtze Plain. However, 21 out of 51 lakes exhibited statistically significant (p < .05) decreasing trends in PEO during the observation period, suggesting an overall improvement in the water quality of lakes on the Yangtze Plain in recent years. The methods developed here are expected to contribute to real-time monitoring of drinking water safety for local regions, and the long-term results provide valuable baseline information for future lake conservation and restoration efforts.",
keywords = "Algal bloom, Chlorophyll-a, Eutrophication, Lakes, MERIS, OLCI, Water quality, Yangtze Plain",
author = "Qi Guan and Lian Feng and Xuejiao Hou and Guy Schurgers and Yi Zheng and Jing Tang",
year = "2020",
month = "9",
day = "1",
doi = "10.1016/j.rse.2020.111890",
language = "English",
volume = "246",
journal = "Remote Sensing of Environment",
issn = "0034-4257",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Eutrophication changes in fifty large lakes on the Yangtze Plain of China derived from MERIS and OLCI observations

AU - Guan, Qi

AU - Feng, Lian

AU - Hou, Xuejiao

AU - Schurgers, Guy

AU - Zheng, Yi

AU - Tang, Jing

PY - 2020/9/1

Y1 - 2020/9/1

N2 - The eutrophication problems in lakes on the Yangtze Plain of China have attracted global concern. However, a comprehensive assessment of the eutrophication status and its evolution is still lacking for these regional lakes, mostly because of technical difficulties and/or insufficient data to cover the large region. Our study attempts to fill this knowledge gap by using the entire archive of remote sensing images from two satellite ocean color missions (MEdium Resolution Imaging Spectrometer, or MERIS (2003−2011), and Ocean and Land Color Instrument, or OLCI (2017–2018)), together with in situ data on remote sensing reflectance and chlorophyll-a (Chla) concentrations across various lakes on the Yangtze Plain. A machine learning-based piecewise Chla algorithm was developed in this study, with special considerations to improve algorithm performance under lower Chla conditions. Remotely sensed Chla and algal bloom areas were then used to classify the eutrophication status of 50 large lakes on the Yangtze Plain, and the frequent satellite observations enabled us to estimate the probability of eutrophication occurrence (PEO) for each examined lake. The long-term mean Chla ranged from 17.58 mg m−3 to 43.86 mg m−3 on the Yangtze Plain, and severe floating algal blooms were found in 7 lakes. All 50 lakes had high climatological PEO values (50%) during the study period, indicating a generally high probability of eutrophication in lakes on the Yangtze Plain. However, 21 out of 51 lakes exhibited statistically significant (p < .05) decreasing trends in PEO during the observation period, suggesting an overall improvement in the water quality of lakes on the Yangtze Plain in recent years. The methods developed here are expected to contribute to real-time monitoring of drinking water safety for local regions, and the long-term results provide valuable baseline information for future lake conservation and restoration efforts.

AB - The eutrophication problems in lakes on the Yangtze Plain of China have attracted global concern. However, a comprehensive assessment of the eutrophication status and its evolution is still lacking for these regional lakes, mostly because of technical difficulties and/or insufficient data to cover the large region. Our study attempts to fill this knowledge gap by using the entire archive of remote sensing images from two satellite ocean color missions (MEdium Resolution Imaging Spectrometer, or MERIS (2003−2011), and Ocean and Land Color Instrument, or OLCI (2017–2018)), together with in situ data on remote sensing reflectance and chlorophyll-a (Chla) concentrations across various lakes on the Yangtze Plain. A machine learning-based piecewise Chla algorithm was developed in this study, with special considerations to improve algorithm performance under lower Chla conditions. Remotely sensed Chla and algal bloom areas were then used to classify the eutrophication status of 50 large lakes on the Yangtze Plain, and the frequent satellite observations enabled us to estimate the probability of eutrophication occurrence (PEO) for each examined lake. The long-term mean Chla ranged from 17.58 mg m−3 to 43.86 mg m−3 on the Yangtze Plain, and severe floating algal blooms were found in 7 lakes. All 50 lakes had high climatological PEO values (50%) during the study period, indicating a generally high probability of eutrophication in lakes on the Yangtze Plain. However, 21 out of 51 lakes exhibited statistically significant (p < .05) decreasing trends in PEO during the observation period, suggesting an overall improvement in the water quality of lakes on the Yangtze Plain in recent years. The methods developed here are expected to contribute to real-time monitoring of drinking water safety for local regions, and the long-term results provide valuable baseline information for future lake conservation and restoration efforts.

KW - Algal bloom

KW - Chlorophyll-a

KW - Eutrophication

KW - Lakes

KW - MERIS

KW - OLCI

KW - Water quality

KW - Yangtze Plain

U2 - 10.1016/j.rse.2020.111890

DO - 10.1016/j.rse.2020.111890

M3 - Journal article

AN - SCOPUS:85084957944

VL - 246

JO - Remote Sensing of Environment

JF - Remote Sensing of Environment

SN - 0034-4257

M1 - 111890

ER -

ID: 242527466