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The impact of sea bottom effects on the retrieval of water constituent concentrations from multispectral satellite images in complex shallow tidal waters supported by radiative transfer modeling

Title data

Arabi, Behnaz ; Salama, Mhd. Suhyb ; van der Wal, Daphne ; Pitarch, Jaime ; Verhoef, Wouter:
The impact of sea bottom effects on the retrieval of water constituent concentrations from multispectral satellite images in complex shallow tidal waters supported by radiative transfer modeling.
In: Remote Sensing of Environment. Vol. 237 (2020) . - 111596.
ISSN 0034-4257
DOI: https://doi.org/10.1016/j.rse.2019.111596

Official URL: Volltext

Abstract in another language

Many coastal waters include large areas of Optically Shallow Waters (OSWs) ‎where the sea-bottom affects above-water observations of remote sensing ‎reflectance (Rrs [sr−1]). If not treated, the effect of bottom reflectance will ‎interfere with the correct retrieval of Water Constituent Concentrations ‎‎(WCCs) from hyperspectral and multispectral remote sensing observations. ‎To study this phenomenon in more detail, the existing semi-infinite ‎‎2SeaColour Radiative Transfer (RT) model was modified into a finite water ‎layer model, bounded by a diffusely reflecting surface at the sea-bottom. ‎From simulations with the new model, called Water - Sea Bottom (WSB) ‎model, it was observed that a ratio of spectral bands in the Near-Infrared, ‎bands 750 nm and 900 nm, is nearly insensitive to the WCCs and increases ‎with the shallowness of the water, and therefore can be used as a robust index ‎to detect OSWs. The newly established Near-Infrared Bottom Effect Index ‎‎(NIBEI) was applied to a series of satellite observations over the Wadden Sea ‎during high and low tidal phases. Images from the MEdium Resolution ‎Imaging Spectrometer (MERIS) and the Ocean and Land Colour Instrument ‎‎(OLCI) were processed to retrieve WCCs of the study area. The results indicate ‎that the sea-bottom effect in OSWs affects the accuracy of atmospheric ‎correction and retrievals. On the other hand, applying the NIBEI to flag OSWs ‎improves the reliability and consistency of WCCs maps. The application of ‎proposed NIBEI on satellite images requires only Top Of Atmosphere (TOA) ‎radiances at 750 nm and 900 nm and does not depend on atmospheric ‎correction and ancillary local input data (e.g., bathymetry map, bottom type, ‎empirical coefficients, in-situ measurements). As a result, the proposed NIBEI ‎can readily be applied to detect OSWs on various ocean colour remote sensors ‎in various shallow coastal regions.‎‎

Further data

Item Type: Article in a journal
Refereed: No
Keywords: Remote sensing; Water quality monitoring; OLCI; Sentinel-3;MERIS; Optically shallow waters; Tidal waters; The Wadden Sea; Sea-bottom effect; Radiative transfer modeling; MODTRAN; 2SeaColour
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Climatology > Professor Climatology - Univ.-Prof. Dr. Cyrus Samimi
Research Institutions > Collaborative Research Centers, Research Unit > EXC 2052 - Africa Multiple: Afrikastudien neu gestalten
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Climatology
Research Institutions
Research Institutions > Collaborative Research Centers, Research Unit
Result of work at the UBT: No
DDC Subjects: 300 Social sciences > 310 Statistics
500 Science > 500 Natural sciences
500 Science > 550 Earth sciences, geology
Date Deposited: 11 Jul 2022 06:55
Last Modified: 01 Aug 2023 13:26
URI: https://eref.uni-bayreuth.de/id/eprint/70500