Spectral classification of water masses under the influence of the Amazon River plume |
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| Authors: | Gustavo Souto Fontes Molleri,Milton Kampel Evlyn M&# rcia Le&# o de Moraes Novo |
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| Affiliation: | 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 theEquatorial Atlantic Ocean cause distinct spectral response of its waters as compared to the nearbyocean waters. This paper shows the application of K-means clustering algorithm for classifying watermasses 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 WideField-of-view Sensor (SeaWiFS) remote sensing reflectances values and the following bio-opticalproducts: (i) chlorophyll-a concentration, (ii) water attenuation coefficient and (iii) absorptioncoefficient for dissolved and detrital material. Four different water masses were identified suchas: (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 thatthe 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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