Remote sensing of dissolved organic carbon (DOC) stocks, fluxes and transformations along the land-ocean aquatic continuum: advances, challenges, and opportunities

Fichot, Cédric G.; Tzortziou, Maria; Mannino, Antonio

doi:10.1016/j.earscirev.2023.104446

Cited by 16 publications

(12 citation statements)

References 245 publications

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“…DOC refers to various dissolved organic molecules ubiquitous in aquatic systems. It is a dynamic reduced carbon pool with important ecological and geochemical functions in inland and coastal waters [194,195]. A regional, red-blue ratio algorithm was proposed to estimate Lake Taihu's surface DOC and analyze its spatiotemporal variation characteristics [196].…”

Section: Other Parametersmentioning

confidence: 99%

A Systematic Review of the Application of GOCI to Water Quality Monitoring of Inland and Coastal Waters

Shao,

Wang,

Liu

et al. 2024

Preprint

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In recent decades, as eutrophication in inland and coastal waters (ICWs) has increased due to anthropogenic activities and global warming, so has the need for timely monitoring. Compared with traditional sampling and laboratory analysis methods, satellite remote sensing technology can provide macro-scale, low-cost, and near real-time water quality monitoring services. The Geostationary Ocean Color Imager (GOCI), integrated onboard the Communication Ocean and Meteorological Satellite (COMS) from the Republic of Korea, was the first geostationary ocean color observation satellite and was operational from April 1, 2011 to March 31, 2021. Over ten years, GOCI has observed oceans, coastal waters, and inland waters within its 2,500 km×2,500 km target area centered on the Korean Peninsula. The most attractive feature of GOCI, compared with other commonly used watercolor sensors, was its high temporal resolution (1h, eight times daily from 0 UTC to 7 UTC), providing the opportunity to monitor the quality of ICWs, where optical properties can change rapidly throughout the day. This systematic review aims to comprehensively review GOCI features and applications in ICWs, analyzing progress in atmospheric correction algorithms and water quality monitoring. Analyzing 123 articles from the Web of Science and China National Knowledge Infrastructure (CNKI) through a bibliometric quantitative approach, we examined GOCI’s strength and performance with different processing methods. These articles reveal that GOCI played an essential role in monitoring the ecological health of ICWs in its observation area in East Asia. GOCI has led the way to a new era of geostationary ocean satellites, providing new technical means for monitoring water quality in oceans, coastal zones, and inland lakes. We also discuss the challenges encountered by geostationary satellites in monitoring water quality and provide suggestions for improvements.

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Section: Other Parametersmentioning

confidence: 99%

A Systematic Review of the Application of GOCI to Water Quality Monitoring of Inland and Coastal Waters

Shao,

Wang,

Liu

et al. 2024

Preprint

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“…Remarkable progress has been made over the past decades in quantifying CDOM optical properties and DOC fluxes from space (Brewin et al., 2023; Cao & Tzortziou, 2021; Joshi et al., 2017; Mannino et al., 2016). Yet, significant challenges remain in remote sensing retrieval of DOC dynamics and CDOM quality across the land–ocean aquatic continuum, particularly in hydrologically and optically complex urbanized estuaries impacted by anthropogenic—both air and water—pollution and transient forcings (Fichot et al., 2023).…”

Section: Introductionmentioning

confidence: 99%

Impacts of Hydrology and Extreme Events on Dissolved Organic Carbon Dynamics in a Heavily Urbanized Estuary and Its Major Tributaries: A View From Space

Cao,

Tzortziou

2024

JGR Biogeosciences

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Dissolved organic matter and its colored component, Colored Dissolved Organic Matter (CDOM), play a major role in global carbon budgets, and their fluxes provide an essential link between terrestrial and aquatic biogeochemical cycles. Satellite observations can uniquely capture the hydro‐biogeochemical connectivity of terrestrial and aquatic landscapes, across scales. Yet, accurate satellite retrievals of CDOM and dissolved organic carbon (DOC) dynamics remain challenging in urbanized estuaries and coasts. Here, we present an advanced unified algorithm for space‐based retrieval of coastal CDOM and DOC dynamics and its application in Long Island Sound—one of the world's most heavily urbanized estuaries that is becoming increasingly vulnerable to climate change stressors. A rich bio‐optical data set, encompassing a wide range of environmental conditions, was integrated into the algorithm training to retrieve DOC concentrations and CDOM spectral shape (i.e., spectral slope S275–295)—a proxy for DOC quality. The new algorithms were applied to full‐resolution satellite imagery from the Sentinel‐3 Ocean and Land Color Instrument (OLCI) after thoroughly evaluating the performance of six ocean color atmospheric correction approaches (ACOLITE, BAC, C2RCC, MUMM, l2gen, and Polymer). Evaluation of the algorithms yielded mean absolute percent differences of 28%, 12%, and 10% for aCDOM(300), S275–295, and DOC, respectively. Application of the algorithms to multi‐year satellite OLCI imagery captured, for the first time, the coupled impact of seasonal transitions, wind regimes, freshwater inputs, anthropogenic disturbances, and hydrological extremes (both intense precipitation and droughts) on DOC fluxes and CDOM quality at the ecosystem scale. Results have important implications for improved predictions of coastal biogeochemical fluxes in complex urban−estuary systems.

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“…Furthermore, attaining high accuracy for estimates of values of [DOC] from remote sensing in these systems remains challenging. 12 The measurement of DOM Fluorescence (FDOM) by in situ sensors can provide high-frequency and continuous estimates of [DOC] at key locations where DOC dynamics occur on time scales of minutes to hours. 16−18 However, FDOM remains an optical proxy and, therefore, inherently carries significant uncertainties.…”

Section: Introductionmentioning

confidence: 99%

“…Optical proxies can support demanding sampling strategies better than approaches relying on discrete water sampling by enabling instantaneous estimates of [DOC]. High-spatial-resolution remote sensing (e.g., Sentinel-2, Landsat-8/9), which uses the connection between water reflectance and the optical properties of dissolved organic matter (DOM), is being increasingly used to study DOC dynamics in estuaries and coastal wetlands and to provide new quantitative insights. − Although remote sensing remains unparalleled for spatial analysis, the current revisit time of high-spatial-resolution sensors is typically a few days at best, ,, thereby limiting understanding of short-term processes (e.g., tidal, episodic). Furthermore, attaining high accuracy for estimates of values of [DOC] from remote sensing in these systems remains challenging .…”

Section: Introductionmentioning

confidence: 99%

“…High-spatial-resolution remote sensing (e.g., Sentinel-2, Landsat-8/9), which uses the connection between water reflectance and the optical properties of dissolved organic matter (DOM), is being increasingly used to study DOC dynamics in estuaries and coastal wetlands and to provide new quantitative insights. − Although remote sensing remains unparalleled for spatial analysis, the current revisit time of high-spatial-resolution sensors is typically a few days at best, ,, thereby limiting understanding of short-term processes (e.g., tidal, episodic). Furthermore, attaining high accuracy for estimates of values of [DOC] from remote sensing in these systems remains challenging . The measurement of DOM Fluorescence (FDOM) by in situ sensors can provide high-frequency and continuous estimates of [DOC] at key locations where DOC dynamics occur on time scales of minutes to hours. − However, FDOM remains an optical proxy and, therefore, inherently carries significant uncertainties.…”

Section: Introductionmentioning

confidence: 99%

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Improving Estimates of Dissolved Organic Carbon (DOC) Concentration from In Situ Fluorescence Measurements across Estuaries and Coastal Wetlands

Weiser,

Swanson,

Ghosh

et al. 2024

Environ. Sci. Technol.

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The use of optical proxies is essential to the sustained monitoring of dissolved organic carbon (DOC) in estuaries and coastal wetlands, where dynamics occur on subhour time scales. In situ dissolved organic matter (DOM) fluorescence, or FDOM, is now routinely measured along with ancillary water-quality indicators by commercial sondes. However, its reliability as an optical proxy of DOC concentration is often limited by uncertainties caused by in situ interferences and by variability in DOM composition and water matrix (ionic strength, pH) that are typical at the land-ocean interface. Although corrections for in situ interferences already exist, validated strategies to account for changes in the DOM composition and water matrix in these systems are still lacking. The transferability of methods across systems is also poorly known. Here, we used a comprehensive data set of laboratory-based excitation–emission matrix fluorescence and DOC concentration matched to in situ sonde measurements to develop and compare approaches that leverage ancillary water-quality indicators to improve estimates of DOC concentration from FDOM. Our analyses demonstrated the validity of in situ interference correction schemes, the importance of ancillary water-quality indicators to account for DOM composition and water matrix change, and the good transferability of the proposed methods.

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Remote sensing of dissolved organic carbon (DOC) stocks, fluxes and transformations along the land-ocean aquatic continuum: advances, challenges, and opportunities

Cited by 16 publications

References 245 publications

A Systematic Review of the Application of GOCI to Water Quality Monitoring of Inland and Coastal Waters

A Systematic Review of the Application of GOCI to Water Quality Monitoring of Inland and Coastal Waters

Impacts of Hydrology and Extreme Events on Dissolved Organic Carbon Dynamics in a Heavily Urbanized Estuary and Its Major Tributaries: A View From Space

Improving Estimates of Dissolved Organic Carbon (DOC) Concentration from In Situ Fluorescence Measurements across Estuaries and Coastal Wetlands

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