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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Spatial and temporal variability of light attenuation in large rivers of the Amazon

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Autor(es):
Costa, M. P. F. [1] ; Novo, E. M. L. M. [2] ; Telmer, K. H. [3]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Victoria, Dept Geog, Victoria, BC - Canada
[2] Inst Nacl Pesquisas Espaciais, Sao Paulo - Brazil
[3] Univ Victoria, Sch Earth & Ocean Sci, Victoria, BC - Canada
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Hydrobiologia; v. 702, n. 1, p. 171-190, FEB 2013.
Citações Web of Science: 20
Resumo

The light field and its relationship with biogeochemical variables were investigated in the Solimes, Negro, Amazon, Madeira, Uatum, Trombetas, and Tapajs Rivers. In high suspended sediment rivers, total suspended matter is the primary control on light attenuation (r = 0.8), with colored dissolved organic matter (CDOM) being secondary (r = -0.6) due to scattering and absorption, respectively. Photosynthetically active radiation was the lowest (< 100.0 mu mol m(-2) s(-1) at the depth of half Z (1%)) and was limited to depths of less than 1.0 m and confined to red light. In low suspended sediment rivers, CDOM is the primary control on light attenuation (r = 0.9). The concentrations of chlorophyll a (Chla) and CDOM cause variations among these rivers. High CDOM rivers, Negro and Uatum, are depleted (< 0.5% of incoming irradiance) of blue and green light at the depth of half Z (1%). The light spectra of low CDOM and higher Chla waters, such as the Tapajs, Uatum, and Trombetas Rivers at rising water stage, are restricted to green and red wavelengths, and marked by high absorption at 620 and 670 nm, due to the presence of Cyanophyceae. (AU)

Processo FAPESP: 04/12495-5 - Kevin Telmer | University of Victoria - Canadá
Beneficiário:Bernardino Ribeiro de Figueiredo
Linha de fomento: Auxílio à Pesquisa - Pesquisador Visitante - Internacional
Processo FAPESP: 04/14086-5 - Maycira Pereira de Farias Costa | University of Victoria - Canadá
Beneficiário:Evlyn Márcia Leão de Moraes Novo
Linha de fomento: Auxílio à Pesquisa - Pesquisador Visitante - Internacional