Data/hora: 01/06/2024 02:07:03

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France
Título: | Mass-specific light absorption coefficients of natural aquatic particles in the near-infrared spectral region
Autores: | Roettgers, Ruediger; Dupouy, Cecile; Taylor, Bettina B.; Bracher, Astrid; Wozniak, Slawomir B.
Data: | 2014-09
Ano: | 2014
Resumo: | The extent of light absorption in the near-infrared spectral region (NIR; 700-900 nm) of natural suspended particles was investigated by determining the absorption and mass-specific absorption coefficients of samples from different environments: river, coastal waters, tropical lagoon, and oceanic waters. Large amounts of sample were collected onto glass-fiber filters and measured inside the integrating sphere of a spectrophotometer. The absorption coefficient of particle suspension was also determined for visible wavelengths with a point-source integrating cavity absorption meter. Measurable nonzero particulate absorption in the NIR was determined in all samples, even in algal cultures. It was highest in the river samples (e.g., 1.7 m(-1) at 850 nm), reaching values similar to the NIR absorption of pure water-a strong NIR absorber. Lowest values were in oligotrophic waters and in algal cultures. Ratios of absorption at 750 nm to absorption at 442 and 672 nm varied between 2% to 30% and 3% to 80%, respectively. Mass-specific absorption in the NIR at 850 nm was also highest in the river (0.012 m(2) g(-1)) and lowest in oligotrophic waters (0.002-0.003 m(2) g(-1)). The observed NIR absorption can partly be explained by absorption of minerogenic particles, whereas the contribution of organic detritus to the NIR absorption is still mostly unknown.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00297/40815/39842.pdf

DOI:10.4319/lo.2014.59.5.1449

https://archimer.ifremer.fr/doc/00297/40815/

Editor: | Amer Soc Limnology Oceanography
Formato: | application/pdf
Fonte: | Limnology And Oceanography (0024-3590) (Amer Soc Limnology Oceanography), 2014-09 , Vol. 59 , N. 5 , P. 1449-1460

Fonte:

2014, by the Association for the Sciences of Limnology and Oceanography, Inc.

info:eu-repo/semantics/openAccess

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