Estimation of the <Emphasis Type="Italic">in situ</Emphasis> Ultraviolet-A absorption of seawater by a simple irradiance inversion model |
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| Authors: | Takafumi Hirata |
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| Institution: | (1) Centre for observation of Air-Sea Interactions and fluXes (CASIX), Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth, Devon, PL1 3DH, UK |
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| Abstract: | 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. |
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| Keywords: | UV absorption irradiance inversion |
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