Changes of water clarity in large lakes and reservoirs across China observed from long-term MODIS

Wang, Shenglei; Li, Junsheng; Zhang, Bing; Lee, Zhongping; Spyrakos, Evangelos; Feng, Lian; Liu, Chong; Zhao, Hongli; Wu, Yanhong; Zhu, Liping; Jia, Liming; Wan, Wei; Zhang, Fang-Fang; Shen, Qian; Tyler, Andrew N.; Zhang, Xianfeng

doi:10.1016/j.rse.2020.111949

Cited by 121 publications

(100 citation statements)

References 72 publications

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“…Specifically, when we restrict analysis to larger waterbodies, we find only nominal change in U.S. lake clarity, but the more inclusive analysis presented here suggests that overall lake water clarity within the United States has increased over the past 35 years. While this is the first study of trends in lake water clarity at a national scale, it extends regional studies throughout the northeast that have found water quality in lakes is either largely stable or improving (50,(53)(54)(55), as well as work in China and Sweden indicating that national management policies are decreasing eutrophication rates (4,56,57). While more work is required to understand the multiscale drivers of water clarity, the results presented here bring us closer to realizing research goals dating back more than 20 years emphasizing that representative sampling is required for effective monitoring of freshwater resources (6,7).…”

Section: Discussionmentioning

confidence: 50%

Multi-decadal improvement in U.S. lake water clarity

Topp¹,

Pavelsky²,

Stanley³

et al. 2020

Preprint

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Section: Discussionmentioning

confidence: 50%

Multi-decadal improvement in U.S. lake water clarity

Topp¹,

Pavelsky²,

Stanley³

et al. 2020

Preprint

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“…The FUI has been widely used in indicative analysis to understand variations in the ocean and inland water quality [26][27][28][29][30][31][32][33]. The water colors can be assigned with FUI ranging from 1 (indigo-blue) to 21 (cola-brown).…”

Section: Resultsmentioning

confidence: 99%

“…Chromaticity analysis is widely used for quantitative determination of the color of ocean and inland waters, using the chromaticity parameters, such as Forel-Ule Color Index and Excitation Purity [26][27][28][29][30][31][32][33]. In [34,35], the authors presented the Forel-Ule Color Index (FUI), which can be used as a proxy for natural waters with different optical properties (indicating anomaly in water quality).…”

Section: Introductionmentioning

confidence: 99%

Indicative Lake Water Quality Assessment Using Remote Sensing Images-Effect of COVID-19 Lockdown

Wagh

Sojan

Babu

et al. 2020

Water

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The major lockdown due to the COVID-19 pandemic has affected the socio-economic development of the world. On the other hand, there are also reports of reduced pollution levels. In this study, an indicative analysis is adopted to understand the effect of lockdown on the changes in the water quality parameters for Lake Hussain Sagar using two remote sensing techniques: (i) spectral reflectance (SR) and (ii) chromaticity analysis (Forel-Ule color Index (FUI) and Excitation Purity). The empirical relationships from earlier studies imply that (i) increase in SR values (band B2) indicates a reduction in Chlorophyll-a (Chl-a) and Colored Dissolved Organic Matter (CDOM) concentrations, and (ii) increase in FUI indicates an increase in Total Suspended Solids (TSS). The Landsat 8 OLI satellite images are adopted for comparison between (i) January to May of year 2020: the effect of lockdown on water quality, and (ii) March and April for years 2015 to 2020: historical variations in water quality. The results show notable changes in SR values and FUI due to lockdown compared to before lockdown and after unlock suggesting a significant reduction in lake water pollution. In addition, the historical variations within April suggest that the pollution levels are least in the year 2020.

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“…The relationships between FUI and water quality parameters (e.g. chlorophyll-a (Chl-a) and total suspended matter (TSM), coloured dissolved organic matter (CDOM), turbidity, and water clarity) have been previously explored and documented 6 , 7 , 12 , 13 . While FUI yields more information on Chl-a for open oceans 11 , 12 , it is well-correlated with water clarity for coastal and inland waters according to the recent studies 12 , 14 , 15 .…”

Section: Background and Summarymentioning

confidence: 99%

“…chlorophyll-a (Chl-a) and total suspended matter (TSM), coloured dissolved organic matter (CDOM), turbidity, and water clarity) have been previously explored and documented 6 , 7 , 12 , 13 . While FUI yields more information on Chl-a for open oceans 11 , 12 , it is well-correlated with water clarity for coastal and inland waters according to the recent studies 12 , 14 , 15 . Given its low uncertainties, feasible transferability, and intrinsic relationship with water quality, FUI was recently promoted as a comprehensive water quality index for marine and inland waters, especially in large regions and over long time spans 7 , 12 , 14 .…”

Section: Background and Summarymentioning

confidence: 99%

A dataset of remote-sensed Forel-Ule Index for global inland waters during 2000–2018

Wang

Zhang

et al. 2021

Sci Data

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Water colour is the result of its constituents and their interactions with solar irradiance; this forms the basis for water quality monitoring using optical remote sensing data. The Forel-Ule Index (FUI) is a useful comprehensive indicator to show the water colour variability and water quality change in both inland waters and oceans. In recent decades, lakes around the world have experienced dramatic changes in water quality under pressure from both climate change and anthropogenic activities. However, acquiring consistent water colour products for global lakes has been a challenge. In this paper we present the first time series FUI dataset for large global lakes from 2000–2018 based on MODIS observations. This dataset provides significant information on spatial and temporal changes of water colour for global large lakes during the past 19 years. It will be valuable to studies in search of the drivers of global and regional lake colour change, and the interaction mechanisms between water colour, hydrological factors, climate change, and anthropogenic activities.

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Changes of water clarity in large lakes and reservoirs across China observed from long-term MODIS

Cited by 121 publications

References 72 publications

Multi-decadal improvement in U.S. lake water clarity

Multi-decadal improvement in U.S. lake water clarity

Indicative Lake Water Quality Assessment Using Remote Sensing Images-Effect of COVID-19 Lockdown

A dataset of remote-sensed Forel-Ule Index for global inland waters during 2000–2018

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