Spectral classification of water masses under the influence of the Amazon River plume |
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Authors: | Gustavo Souto Fontes Molleri Milton Kampel and Evlyn Mrcia Leo de Moraes Novo |
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Institution: | National Institute for Space Research-INPE, Remote Sensing Division, São José dos Campos, SP, 12227010, Brazil |
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Abstract: | The large amount of dissolved and particulate material discharged by the Amazon River into the
Equatorial Atlantic Ocean cause distinct spectral response of its waters as compared to the nearby
ocean waters. This paper shows the application of K-means clustering algorithm for classifying water
masses in the region under the Amazon River plume influence according to their spectral behavior.
Salinity and temperature data from 67 oceanographic stations were related to Sea-viewing Wide
Field-of-view Sensor (SeaWiFS) remote sensing reflectances values and the following bio-optical
products: (i) chlorophyll-a concentration, (ii) water attenuation coefficient and (iii) absorption
coefficient for dissolved and detrital material. Four different water masses were identified such
as: (1) oceanic water, (2) intermediate oceanic water, (3) intermediate river plume water and (4)
Amazon River plume water. The spectral behavior of these water masses allowed concluding that
the main active optical component of the waters in the region is the colored dissolved organic matter originated mostly from the Amazon River. |
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Keywords: | ocean color remote sensing amazon river plume spectral behavior cluster analysis |
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