Seasonal changes in chlorophyll distributions in Amazon floodplain lakes derived from MODIS images

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...

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Bibliographic Details
Published in:Limnology 2006-12, Vol.7 (3), p.153-161
Main Authors: de Moraes Novo, Evlyn Márcia Leão, de Farias Barbosa, Cláudio Clemente, de Freitas, Ramon Moraes, Shimabukuro, Yosio Edimir, Melack, John M., Filho, Waterloo Pereira
Format: Article
Language:English
Subjects:
Chlorophyll
Floodplains
Freshwater
Lakes
Phytoplankton
Suspended inorganic matter
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Summary: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.[PUBLICATION ABSTRACT]
ISSN:1439-8621
1439-863X
DOI:10.1007/s10201-006-0179-8