Geoscience Reference
In-Depth Information
Detecting CDOM Fluorescence Using High
Spectrally Resolved Satellite Data:
A Model Study
Aleksandra Wolanin, Vladimir Rozanov, Tilman Dinter
and Astrid Bracher
Abstract Absorption and
fluorescence of CDOM are widely used to characterize
its concentration and composition, both in situ and with remote sensing techniques.
As
fl
fl
fluorescence is an inelastic scattering process, it can potentially be observed in
filling-in of Fraunhofer lines with the DOAS method in high spectrally resolved
satellite data. Here, we perform a theoretical model study and preliminary DOAS
retrieval on SCIAMACHY data in order to test the feasibility of such an approach.
Our results show that retrieving CDOM
cult, due to its relatively
weak signal in global oceans (in comparison to Raman scattering of clear water)
and varying broad spectral features. Detailed studies of the synergistic use of
narrow and broad
fl
fluorescence is dif
fluorescence features, and an appropriate scheme to account for
disturbance effects of Raman scattering, are needed for further investigating the
retrieval of CDOM
fl
fl
uorescence.
1 Introduction
Colored or chromophoric dissolved organic matter (CDOM) is part of the dissolved
organic matter (DOM) pool, which signi
cantly absorbs light in the UV and blue
region of the light spectrum. CDOM plays a role in many physical, chemical and
biological processes in aquatic systems. Primarily, it reduces potentially harmful
UV radiation within the water column, but on the other hand
—
when abundant
—
limits the amount of light available for photosynthesis.
Optical parameters of CDOM are widely used to characterize it both qualitatively
and quantitatively. Absorbance and
fl
fluorescence of bulks of CDOM are measured
Search WWH ::
Custom Search