Data/hora: 16/06/2024 08:54:46

Provedor de dados: 	5	
País: 	France	
Título: 	Bio-optical anomalies in the world's oceans: An investigation on the diffuse attenuation coefficients for downward irradiance derived from biogeochemical Argo float measurements	
Autores: 	Organelli, Emanuele; Claustre, Herve; Bricaud, Annick; Barbieux, Marie; Uitz, Julia; D'Ortenzio, Fabrizio; Dall'Olmo, Giorgio.	
Data: 	2017-05	
Ano: 	2017	
Palavras-chave: 	Bio-optical anomalies; Light attenuation; Biogeochemical Argo floats; Global ocean; Colored dissolved organic matter.	
Resumo: 	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 classification of the examined regions into three groups. The first one included the Black Sea, a water body characterized by very high colored dissolved organic matter (CDOM) content. The second group was essentially composed by the subtropical gyres (Atlantic and Pacific Oceans), with optical properties consistent with previous models (i.e., no anomalies). High latitude (North Atlantic and Southern oceans) and temperate (Mediterranean Sea) seas formed the third group, in which optical properties departed from existing bio-optical models. Annual climatologies of the Kd(380)/Kd(490) ratio evidenced a persistent anomaly in the Mediterranean Sea, that we attributed to a higher-than-average CDOM contribution to total light absorption. In the North Atlantic subpolar gyre, anomalies were observed only in wintertime and were also attributed to high CDOM concentrations. In the Southern Ocean, the anomaly was likely related to high phytoplankton pigment packaging rather than to CDOM.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	https://archimer.ifremer.fr/doc/00383/49463/49948.pdf

DOI:10.1002/2016JC012629

https://archimer.ifremer.fr/doc/00383/49463/	
Editor: 	Amer Geophysical Union	
Relação: 	info:eu-repo/grantAgreement/EC/FP7/246777/EU//REMOCEAN	
Formato: 	application/pdf	
Fonte: 	Journal Of Geophysical Research-oceans (2169-9275) (Amer Geophysical Union), 2017-05 , Vol. 122 , N. 5 , P. 3543-3564	
Fonte: 	2017. American Geophysical Union. All Rights Reserved.

info:eu-repo/semantics/openAccess

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