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	Provedor de dados ArchiMer (2) Anais da ABC (AABC) (1) Autor BARBOSA,FRANCISCO A.R. (1) BEZERRA-NETO,JOSÉ F. (1) BRANDÃO,LUCIANA P.M. (1) BRIGHENTI,LUDMILA S. (1) Barbieux, Marie (1) Bricaud, Annick (1) Claustre, Herve (1) D'Andon, Odile Fanton (1) D'Ortenzio, Fabrizio (1) Dall'Olmo, Giorgio (1) Gohin, Francis (1) Hamdi, Anouar (1) Mangin, Antoine (1) Organelli, Emanuele (1) Populus, Jacques (1) STAEHR,PETER A. (1) Saulquin, Bertrand (1) Uitz, Julia (1) Mais... Palavra-chave Light attenuation (3) Bio-optical anomalies (1) Biogeochemical Argo floats (1) CDOM (1) Chlorophyll-a (1) Colored dissolved organic matter (1) Euphotic depth (1) Global ocean (1) Kd partition (1) Ocean color (1) Photosynthetic available radiation (1) Seabed mapping (1) Tripton (1) Mais... Tipo do documento Text (2) Info:eu-repo/semantics/article (1) Ano 2017 (2) 2013 (1) País France (2) Brazil (1) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Estimation of the diffuse attenuation coefficient K-dPAR using MERIS and application to seabed habitat mapping ArchiMer Saulquin, Bertrand; Hamdi, Anouar; Gohin, Francis; Populus, Jacques; Mangin, Antoine; D'Andon, Odile Fanton. The availability of light in the water column and at the seabed determines the euphotic zone and constrains the type and the vertical distribution of algae species. Light attenuation is traditionally quantified as the diffuse attenuation coefficient of the downwelling spectral irradiance atwavelength 490 nm(Kd490) or the photosynthetically available radiation (KdPAR). Satellite observations provide global coverage of these parameters at high spatial and temporal resolution and several empirical and semi-analytical models are commonly used to derive Kd490 and KdPAR maps from ocean colour satellite sensors. Most of these existing empirical or semi-analytical models have been calibrated in open ocean waters and performwell in these regions, but tend to... Tipo: Text Palavras-chave: Ocean color; Light attenuation; Photosynthetic available radiation; Euphotic depth; Seabed mapping. Ano: 2013 URL: http://archimer.ifremer.fr/doc/00117/22831/21496.pdf Bio-optical anomalies in the world's oceans: An investigation on the diffuse attenuation coefficients for downward irradiance derived from biogeochemical Argo float measurements ArchiMer Organelli, Emanuele; Claustre, Herve; Bricaud, Annick; Barbieux, Marie; Uitz, Julia; D'Ortenzio, Fabrizio; Dall'Olmo, Giorgio. Identification of oceanic regions characterized by particular optical properties is extremely important for ocean color applications. The departure from globally established bio-optical models introduces uncertainties in the retrieval of biogeochemical quantities from satellite observations. Thanks to an array of 105 Biogeochemical Argo floats acquiring almost daily downward irradiance measurements at selected wavelengths in the UV and blue region of the spectrum, we re-examined the natural variability of the spectral diffuse attenuation coefficients, Kd(λ), among the world's oceans and compared them to previously established bio-optical models. The analysis of 2847 measurements of Kd(λ) at 380 and 490 nm, within the first optical depth, provided a... Tipo: Text Palavras-chave: Bio-optical anomalies; Light attenuation; Biogeochemical Argo floats; Global ocean; Colored dissolved organic matter. Ano: 2017 URL: https://archimer.ifremer.fr/doc/00383/49463/49948.pdf Partitioning of the diffuse attenuation coefficient for photosynthetically available irradiance in a deep dendritic tropical lake Anais da ABC (AABC) BRANDÃO,LUCIANA P.M.; BRIGHENTI,LUDMILA S.; STAEHR,PETER A.; BARBOSA,FRANCISCO A.R.; BEZERRA-NETO,JOSÉ F.. ABSTRACT We studied the effects of particulate and dissolved optically active components on the attenuation of photosynthetic active radiation (PAR) in a tropical lake. The temporal and spatial distribution of tripton, Chl-a and aCDOM(440) and their relative contribution to the diffuse PAR attenuation coefficient (Kd) was investigated at 21 sites (dry and wet seasons and two intermediate periods) and at monthly interval at 1 pelagic site. Higher values of ​​ Kd were observed during the mixing period, characterized by a higher concentration of tripton and Chl-a compared to the stratified rainy season. In the spatial sampling PAR attenuation was dominated by tripton absorption/scattering (average relative contribution of 79%), followed by Chl-a (average... Tipo: Info:eu-repo/semantics/article Palavras-chave: CDOM; Chlorophyll-a; Kd partition; Light attenuation; Tripton. Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200469 Registros recuperados: 3 Primeira ... 1 ... Última

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