The dynamics of fluorescent dissolved organic matter in the Paranaguá estuarine system, Southern Brazil

The dynamics of fluorescent dissolved organic matter in the Paranaguá estuarine system, Southern Brazil

Autor Gusso-Choueri, Paloma Kachel Google Scholar
Choueri, Rodrigo Brasil Autor UNIFESP Google Scholar
Lombardi, Ana Teresa Google Scholar
Machado, Eunice C. Google Scholar
Instituição Univ Fed Parana
Univ Santa Cecilia
Universidade Federal de São Paulo (UNIFESP)
Universidade Federal de São Carlos (UFSCar)
Resumo The aim of this study was to investigate the dynamics of the fluorescent dissolved organic matter (FDOM) in Paranagua Estuarine System (PES) as to infer about the contribution of allochthonous FDOM to the estuarine waters in relation to tidal condition and seasons. Fluorescence spectroscopy was used for such purpose and DOM characterization through fluorescence emission was performed using excitation wavelengths of lambda ex 350 nm and lambda ex 450 nm, the two main fluorescence groups known to be present in natural DOM. Relations between emission wavelength (lambda em) and environmental variables, and the relevance of these variables to the different tides and seasons were identified by principal component analysis. The results showed that the first class of fluorophores (lambda ex 350 nm) changed from the river (freshwater) towards the estuary, whilst the second class (lambda ex 450 nm) has a more conservative nature and does not change as significantly as the first. Allochthonous DOM contribution to the estuarine system is intensified during the rainy season, especially in spring tides, whereas in the dry season the ratio of autochthonous DOM to total DOM in PES waters increased. We concluded that the variation of maximum lambda em of the first class of fluorophores (lambda ex 350 nm) is mainly related to allochthonous contribution, whilst the maximum of emission for the second class of fluorophores (lambda ex 450 nm) is dependent on the contribution of the different sources of organic matter (freshwater and marine water DOM contribution).
Assunto Humic substances
Estuaries
FDOM's source
Tidal cycle
Estuarine turbidity maximum
Fluorescence spectroscopy
Idioma Inglês
Financiador Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Número do financiamento CNPq: 472509/2006-3
CNPq: 314361/2009-0
Data 2011-10-01
Publicado em Brazilian Journal Of Oceanography. Sao Paulo: Inst Oceanografico, Univ Sao Paulo, v. 59, n. 4, p. 311-326, 2011.
ISSN 1679-8759 (Sherpa/Romeo, fator de impacto)
Editor Inst Oceanografico, Univ Sao Paulo
Extensão 311-326
Fonte http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592011000400002
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:000300058600002
SciELO S1679-87592011000400002 (estatísticas na SciELO)
URI http://repositorio.unifesp.br/11600/43138

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