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Seasonal changes in chlorophyll distributions in Amazon floodplain lakes derived from MODIS images |
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| Authors: | Evlyn Márcia Leão de Moraes Novo Cláudio Clemente de Farias Barbosa Ramon Moraes de Freitas Yosio Edimir Shimabukuro John M. Melack Waterloo Pereira Filho |
| Affiliation: | 1. Coordena??o de Observa??o da Terra, Instituto Nacional de Pesquisas Espaciais, S?o José dos Campos, Avenida dos Astronautas, 1758, CEP 12 201 970, Brazil 2. Bren School of Environmental Science and Management, University of California, Santa Barbara, CA, USA 3. Departamento de Geografia, Universidade Federal de Santa Maria, Faixa de Camobi, km 9, Campus Universitário, Santa Maria, CEP 97105-900, Rio Grande do Sul, Brazil |
| Abstract: | To assess seasonal changes in phytoplanktonic chlorophyll distributions in Amazon floodplain lakes, a linear mixing model was applied to Moderate Resolution Imaging Spectroradiometer (MODIS) reflectance data acquired at four river stages: rising (April), high (June), decreasing (September), and low (November). The study area is located in a floodplain reach from Parintins (Amazonas) to near Almeirim (Pará). A three-end-member mixing model designed to uncouple three fractions [high suspended inorganic matter (ip), low inorganic suspended matter (w), and high chlorophyll a (Chl)] was tested in Lake Curuaí (1.5°S 55.43°W) based on field sampling done almost concurrently with satellite overpasses. During high water, phytoplankton patches are confined to lakes closer to terra firme under the influence of clear water inflow, whereas during the low and decreasing water stages, the patches are more evenly distributed over the floodplain. |
| Keywords: | Amazon floodplain lakes Chlorophyll distribution Remote sensing |
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