Optical Classification of Lower Amazon Waters Based on In Situ Data and Sentinel-3 Ocean and Land Color Instrument Imagery

Valerio, Aline M.; Kampel, Milton; Vantrepotte, Vincent; Ward, Nicholas D.; Richey, Jeffrey E.

doi:10.3390/rs13163057

Title: Optical Classification of Lower Amazon Waters Based on In Situ Data and Sentinel-3 Ocean and Land Color Instrument Imagery

Journal Article · 03 August 2021 · Remote Sensing

DOI: https://doi.org/10.3390/rs13163057 · OSTI ID:1821596

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National Institute for Space Research (INPE) (Brazil). Earth Observation and Geoinformatics Division
Centre National de la Recherche Scientifique (CNRS), Lille (France). Laboratoire d’Océanologie et de Géosciences (LOG)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Univ. of Washington, Seattle, WA (United States)
Univ. of Washington, Seattle, WA (United States)

Optical water types (OWTs) were identified from an in situ dataset of concomitant biogeochemical and optical parameters acquired in the Amazon River and its tributaries, in the Lower Amazon region, at different hydrological conditions from 2014 to 2017. A seasonal bio-optical characterization was performed. The k-means classification was applied to the in situ normalized reflectance spectra (rn(λ)), allowing the identification of four OWTs. An optical index method was also applied to the rn(λ) defining the thresholds of the OWTs. Next, level-3 Sentinel-3 Ocean and Land Color Instrument images representative of the seasonal discharge conditions were classified using the identified in situ OWTs as reference. The differences between Amazon River and clearwater tributary OWTs were dependent on the hydrological dynamics of the Amazon River, also showing a strong seasonal variability. Each OWT was associated with a specific bio-optical and biogeochemical environment assessed from the corresponding absorption coefficient values of colored dissolved organic matter (aCDOM) and particulate matter (ap), chlorophyll-a and suspended particulate matter (SPM) concentrations, and aCDOM/ap ratio. The rising water season presented a unique OWT with high SPM concentration and high relative contribution of ap to total absorption compared to the other OWTs. This bio-optical characterization of Lower Amazon River waters represents a first step for developing remote sensing inversion models adjusted to the optical complexity of this region.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1821596

Report Number(s):: PNNL-SA--162771

Journal Information:: Remote Sensing, Journal Name: Remote Sensing Journal Issue: 16 Vol. 13; ISSN 2072-4292

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
Amazon
Amazon River
CDOM
Photosynthesis
aquatic
bio-optical products
biogeochemistry
carbon
chlorophyll
chromophoric
coastal
coastal ecosystems
continuum
dissolved organic matter
hydrobiogeochemistry
interface
optical
optically significant constituents
organic
organic matter
remote sensing
remote sensing reflectance
river
satellite
terrestrial aquatic interface
tidal
tidal river
water color
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Title: Optical Classification of Lower Amazon Waters Based on In Situ Data and Sentinel-3 Ocean and Land Color Instrument Imagery

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