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Tedetti, M., Sempéré, R., Vasilkov, A., Charrière, B., Nérini, D., Miller, W. L., Kawamura, K. & Raimbault, P. (2007) High penetration of ultraviolet radiation in the south east Pacific waters. Geophysical Research Letters, 34. 
Added by: Sarina (26 Jun 2020 10:39:18 UTC)   
Resource type: Journal Article
DOI: 10.1029/2007GL029823
BibTeX citation key: Tedetti2007
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Categories: Englisch = English
Keywords: south east Pacific, South Pacific Gyre, ultraviolet radiation
Creators: Charrière, Kawamura, Miller, Nérini, Raimbault, Sempéré, Tedetti, Vasilkov
Collection: Geophysical Research Letters
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Abstract
We investigated the penetration of solar ultraviolet radiation (UVR) in the surface waters of the south east Pacific (08–35°S, 142–73°W) from October to December 2004 during the BIOSOPE cruise. In the hyper-oligotrophic waters of the South Pacific Gyre (near Easter Island), diffuse attenuation coefficients for downward irradiance, Kd(λ), at 305 nm (UV-B), 325, 340 and 380 nm (UV-A) were 0.083, 0.055, 0.039 and 0.021 m−1, respectively. The corresponding 10% irradiance depths, Z10%(λ), were 28, 42, 59 and 110 m, respectively. These UVR penetrations are the highest ever reported for oceanic waters and are equal to those measured in the clearest fresh waters. UV-extended inherent optical property (IOP) and radiative transfer (RT) models allowed reliable estimations of Kd(λ) with the Case 1 water assumption when two values of chromophoric dissolved organic matter (CDOM) absorption spectral slope coefficient (S) were used, i.e. 0.017 nm−1 at 325, 340 and 380 nm, and 0.023 nm−1 at 305 nm.
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