Journal of Oceanography

, Volume 64, Issue 4, pp 561–566 | Cite as

Estimation of the in situ Ultraviolet-A absorption of seawater by a simple irradiance inversion model

  • Takafumi HirataEmail author
Short Contribution


An irradiance inversion model to estimate the in situ absorption coefficient of seawater has been developed for the Ultraviolet-A (UVA) wavelength domain. Input parameters are sun angle and the up-and downward planar irradiances measured for at least two depths. The present method does not require seawater to be sampled, and is a discrete wavelength method which returns the absorption coefficient at a given wavelength from the irradiances measured at that wavelength without assuming a spectral shape of any optical properties a priori. Comparison between the model results and spectrophotometric measurements shows that the model is practically useful when cloud cover in the atmosphere is ≤ 50%. According to the present method, measurements of the irradiances enable simultaneous observation of the in situ underwater UVA radiation level and the absorption capacity of bulk seawater using a radiometer.


UV absorption irradiance inversion 


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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Centre for observation of Air-Sea Interactions and fluXes (CASIX)Plymouth Marine LaboratoryPlymouth, DevonUK

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