Autor(es)

Ferreira, Amabile ^[1] ; Ciotti, Aurea Maria ^[1] ; Colo Giannini, Maria Fernanda ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ctr Biol Marinha CEBIMar, Lab Aquarela, BR-11600000 Sao Sebastiao, SP - Brazil

• 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: 03/13747-5 - Análise da variabilidade sazonal da circulação do Estuário de Santos (SP)
• Beneficiário: Joséph Harari
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• 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
• Modalidade de apoio: Auxílio à Pesquisa - Programa PRONEX - Temático
• Processo FAPESP: 04/12698-3 - Analise da contribuicao do fitoplancton e do material particulado na absorcao de luz na baia de santos.
• Beneficiário: Amabile Ferreira
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 05/60602-8 - Variabilidade espacial da abundancia do fitoplancton na baia de santos e sua relacao com os estuarios de santos e sao vicente.
• Beneficiário: Maria Fernanda Coló Giannini
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica