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dc.contributor.author
Pérez, Gonzalo
dc.contributor.author
Galí, Martí
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Royer, Sarah Jeanne
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Sarmento, Hugo
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Gasol, Josep M.
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Marrasé, Cèlia
dc.contributor.author
Simó, Rafel
dc.date.available
2019-02-25T16:58:52Z
dc.date.issued
2016-08
dc.identifier.citation
Pérez, Gonzalo; Galí, Martí; Royer, Sarah Jeanne; Sarmento, Hugo; Gasol, Josep M.; et al.; Bio-optical characterization of offshore NW Mediterranean waters: CDOM contribution to the absorption budget and diffuse attenuation of downwelling irradiance; Pergamon-Elsevier Science Ltd; Deep Sea Research Part I: Oceanographic Research Papers; 114; 8-2016; 111-127
dc.identifier.issn
0967-0637
dc.identifier.uri
http://hdl.handle.net/11336/70773
dc.description.abstract
We investigated the peculiar bio-optical characteristics of the Mediterranean Sea focusing on the spectral diffuse attenuation coefficient [Kd (λ)] and its relationship with chlorophyll a concentration (Chl a), complemented with measurements of light absorption by chromophoric dissolved organic matter (CDOM) and the optical properties of particulate material. The non-water absorption budget showed that CDOM was the largest contributor in the 300-600 nm range (>60% of the absorption at 443 nm in the euphotic layer), increasing to 80% within the first optical depth (FOD). This translated into CDOM accounting for >50% of KdBio (λ) (the irradiance attenuation coefficient caused by all non-water absorptions) between 320 and 555 nm and throughout both layers (FOD and euphotic). Indeed, we tested three Chl a-based bio-optical models and all three underestimated Kd (λ), evidencing the importance of CDOM beside Chl a to fully account for light attenuation. The Morel & Maritorena (2001) model (M&M 01) underestimated Kd (λ) in the UV and blue spectral regions within the FOD layer, showing lower differences with increasing wavelengths. The Morel et al. (2007a) model (BGS 07) also underestimated Kd (λ) in the FOD layer, yet it performed much better in the 380-555 nm range. In the euphotic layer, the Morel (1988) model (JGR 88) underestimated Kd ( λ) showing higher differences at 412 and 443 nm and also performed better at higher wavelengths. Observed euphotic layer depths (Z1%) were 28 m shallower than those predicted with the M&M 01 empirical relationship, further highlighting the role of CDOM in the bio-optical peculiarity of Mediterranean Sea. In situ measurements of the CDOM index (Φ), an indicator of the deviation of the CDOM-Chl a average relationship for Case 1 waters, gave a mean of 5.9 in the FOD, consistent with simultaneous estimates from MODIS (4.8±0.4). The implications of the bio-optical anomaly for ecological and biogeochemical inferences in the Mediterranean Sea are discussed.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Bio-Optics Anomaly
dc.subject
Cdom
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Nw Mediterranean
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Light Attenuation
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Otras Ciencias Biológicas
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Ciencias Biológicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Bio-optical characterization of offshore NW Mediterranean waters: CDOM contribution to the absorption budget and diffuse attenuation of downwelling irradiance
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-02-12T16:55:39Z
dc.journal.volume
114
dc.journal.pagination
111-127
dc.journal.pais
Reino Unido
dc.journal.ciudad
Oxford
dc.description.fil
Fil: Pérez, Gonzalo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina
dc.description.fil
Fil: Galí, Martí. Consejo Superior de Investigaciones Científicas; España. Laval University; Canadá
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Fil: Royer, Sarah Jeanne. Consejo Superior de Investigaciones Científicas; España
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Fil: Sarmento, Hugo. Universidade Federal do São Carlos; Brasil
dc.description.fil
Fil: Gasol, Josep M.. Consejo Superior de Investigaciones Científicas; España
dc.description.fil
Fil: Marrasé, Cèlia. Consejo Superior de Investigaciones Científicas; España
dc.description.fil
Fil: Simó, Rafel. Consejo Superior de Investigaciones Científicas; España
dc.journal.title
Deep Sea Research Part I: Oceanographic Research Papers
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1016/j.dsr.2016.05.011
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0967063715301102
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