Utilizing the vibrational-Raman-scattering signal of oceanic waters in hyperspectral satellite measurements.


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Astrid.Bracher [ at ] awi.de

Abstract

The determination of the penetration depth of solar light into oceanic waters from satellite remote sensing data is still a challenging and high defective task. The most widely used value for the availability of light in the water column is the diffuse attenuation coefficient for downwelling solar radiation. In this study a new approach to retrieve the diffuse attenuation coefficient of oceanic waters based on the spectral signatures of Vibrational Raman Scattering (VRS) detected in hyperspectral satellite data is introduced. VRS is an inelastic scattering effect of the water itself where energy is transported from the photon to the molecule during the scattering process to excite the water molecule to vibrations (Stokes lines, anti-Stokes lines are neglected). The emitted photon has another energy, i. e. a different wavelength. As a transpectral process VRS contributes significantly to the filling-in of solar Fraunhofer lines. This signal is clearly identified in hyper-spectral satellite measurements, as shown for data of the satellite sensor SCIAMACHY and was exploited as a proxy for the radiation availability in the ocean column [Vountas et al., 2007]. Therefore we directly connect the strength of the VRS signal in SCIAMACHY measurements to the diffuse attenuation coefficient. No further knowledge on the absorption and scattering coefficients of water constituents (IOPs) are required. To model the relationship between VRS and Kd extensive radiative transfer calculations with the coupled ocean-atmosphere RTM SCIATRAN [Rozanov et al., 2002; Blum et al., 2012] have been performed. d



Item Type
Conference (Poster)
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Primary Division
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Not peer-reviewed
Publication Status
Published
Event Details
Poster: ESA Living Planet Symposium 2013, 09 Sep 2013 - 13 Sep 2013, Edinburgh, UK.
Eprint ID
34840
Cite as
Dinter, T. , Rozanov, V. V. , Burrows, J. P. and Bracher, A. (2013): Utilizing the vibrational-Raman-scattering signal of oceanic waters in hyperspectral satellite measurements. , Poster: ESA Living Planet Symposium 2013, Edinburgh, UK, 9 September 2013 - 13 September 2013 .


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