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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.)

Variability in the light absorption coefficients of phytoplankton, nonalgal particles, and colored dissolved organic matter in a subtropical bay (Brazil)

Texto completo
Autor(es):
Ferreira, Amabile [1] ; Ciotti, Aurea Maria [1] ; Colo Giannini, Maria Fernanda [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Ctr Biol Marinha CEBIMar, Lab Aquarela, BR-11600000 Sao Sebastiao, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: ESTUARINE COASTAL AND SHELF SCIENCE; v. 139, p. 127-136, FEB 20 2014.
Citações Web of Science: 5
Resumo

This study characterized the variability in magnitudes and spectral shapes of the absorption coefficients of phytoplankton, detritus, and colored dissolved organic matter (CDOM) in a dynamic bay (Santos Bay) in southeastern Brazil in response to the contributions of the main estuarine channel and large tide variations, therefore in different time scales. Two strategies were adopted: (1) monthly year-round sampling in the estuarine channel and Santos Bay and (2) sampling in Santos Bay during spring/neap tides and cold/warm months. Chlorophyll-a concentration and CDOM absorption were higher during warm (wet) months, while the relative contribution of organic and inorganic particles was driven by neap/spring tide cycles. Salinity partially accounted for changes in optical variables, especially for CDOM absorption and total suspended matter (TSM) during cold months and neap tides, respectively. The spectral shapes of detritus and CDOM absorption showed relatively little variability for the entire dataset and were not considered feasible for monitoring purposes. The spectral shape of phytoplankton absorption (index of cell size) varied broadly, with no remarkable dependence on the sampling conditions. Comparison of absorption coefficients measured by the Quantitative Filter Technique (QFT) and Transmittance Reflectance (TR) method showed higher phytoplankton coefficients toward longer visible wavelengths (flatter spectra) and shallower slopes of detritus absorption yielded by the TR method. Our results also suggest that measurements at the near red spectral region result from not only scattering signals but also non-algal particle absorption. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 05/60602-8 - Variabilidade espacial da abundância do fitoplâncton na Baía de Santos e sua relação com os estuários de Santos e São Vicente
Beneficiário:Maria Fernanda Coló Giannini
Linha de fomento: Bolsas no Brasil - Iniciação Científica
Processo FAPESP: 03/09932-1 - A influência do complexo estuarino da Baixada Santista sobre o ecossistema da plataforma adjacente (ECOSAN)
Beneficiário:Ana Maria Setubal Pires-Vanin
Linha de fomento: Auxílio à Pesquisa - Programa PRONEX - Temático
Processo FAPESP: 04/12698-3 - Análise da contribuição do fitoplâncton e do material particulado na absorção de luz na Baía de Santos
Beneficiário:Amabile Ferreira
Linha de fomento: Bolsas no Brasil - Iniciação Científica
Processo FAPESP: 03/13747-5 - Análise da variabilidade sazonal da circulação do Estuário de Santos (SP)
Beneficiário:Joséph Harari
Linha de fomento: Auxílio à Pesquisa - Regular