Two decades water quality monitoring using time-series of multispectral satellite images over the Wadden Sea supported by radiative transfer modelling

Behnaz Arabi; Masoud Moradi; Cyrus Samimi; Wouter Verhoef

doi:10.1117/12.2684352

17 October 2023 Two decades water quality monitoring using time-series of multispectral satellite images over the Wadden Sea supported by radiative transfer modelling

Behnaz Arabi, Masoud Moradi, Cyrus Samimi, Wouter Verhoef

Author Affiliations +

Proceedings Volume 12728, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2023; 127280T (2023) https://doi.org/10.1117/12.2684352
Event: SPIE Remote Sensing, 2023, Amsterdam, Netherlands

Conference Poster

Abstract

Long-term monitoring of Water Constituent Concentrations (WCCs) is essential for water quality assessment in coastal waters, a priority for various government agencies and environmental organizations. However, utilizing satellite observations to track the extended spatial and temporal variations of WCCs, including Chlorophyll-a (Chla), Suspended Particulate Matters (SPMs), and Coloured Dissolved Organic Matters (CDOMs), remains challenging in coastal waters due to their optical complexity and the need for accurate atmospheric correction. In this study, we examined two decades of spatial and temporal variations in Chla [mg m^-3], SPM [g m^-3] concentrations, and CDOM absorption at 440nm [m^-1] using time series data from the Medium Resolution Imaging Spectrometer (MERIS) and the Ocean and Land Colour Instrument (OLCI) spanning from 2003 to 2023. Our research focused on the complex, shallow, and highly turbid waters of the Dutch Wadden Sea, the Netherlands. To achieve this, we employed a coupled atmospheric and water optical model known as MOD2SEA, enabling simultaneous atmospheric correction and WCC retrievals from MERIS images (2003-2012) and OLCI images (2018-2023) in the study area. Our findings reveal that SPM and CDOM variations followed a consistent seasonal pattern over the two-decade period, with SPM values ranging from 10 [g m^-3] to 60 [g m^-3] and CDOM absorption varying from 0 [m^-1] to 0.8 [m^-1]. Chla estimates, on the other hand, displayed a different trend, ranging from 5 [mg m^-3] to 25 [mg m^-3] until 2013. Subsequently, Chla concentrations increased, reaching 45 [mg m^-3] by 2023.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Behnaz Arabi, Masoud Moradi, Cyrus Samimi, and Wouter Verhoef "Two decades water quality monitoring using time-series of multispectral satellite images over the Wadden Sea supported by radiative transfer modelling", Proc. SPIE 12728, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2023, 127280T (17 October 2023); https://doi.org/10.1117/12.2684352

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KEYWORDS

Earth observing sensors

Satellite imaging

Satellites

Water quality

Multispectral imaging

Radiative transfer

Modeling

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