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Spectral Modelling of Estuarine Coloured Dissolved Organic Matter


Affiliations
1 Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, India
2 Marine Biological Laboratory, Andhra University, Visakhapatnam 530 003, India
 

Measuring coloured dissolved organic matter (CDOM) holds advantage over dissolved organic carbon (DOC) determination, as it can be remotely estimated unlike the latter, for which it can potentially act as a proxy. The CDOM absorbance, by definition, falls exponentially with wavelength of light (λ) in the ultravioletvisible region. Investigating over 800 absorption spectra of water samples from the tropical monsoonal Godavari estuary and the Chilika brackish water lagoon, we found that the spectral slope (S) of the 330–440 nm region (S330–440) is best suited to retrieve CDOM and its exponential character.

Keywords

CDOM, Chilika Lagoon, Godavari Estuary, Spectral Slope, S330–440, UV-Visible Absorbance.
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  • Spectral Modelling of Estuarine Coloured Dissolved Organic Matter

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Authors

Nittala S. Sarma
Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, India
Sudarsana Rao Pandi
Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, India
N. V. H. K. Chari
Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, India
Gundala Chiranjeevulu
Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, India
Rayaprolu Kiran
Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, India
K. Shiva Krishna
Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, India
D. Bhaskara Rao
Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, India
P. Venkatesh
Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, India
B. Charan Kumar
Marine Biological Laboratory, Andhra University, Visakhapatnam 530 003, India
A. V. Raman
Marine Biological Laboratory, Andhra University, Visakhapatnam 530 003, India

Abstract


Measuring coloured dissolved organic matter (CDOM) holds advantage over dissolved organic carbon (DOC) determination, as it can be remotely estimated unlike the latter, for which it can potentially act as a proxy. The CDOM absorbance, by definition, falls exponentially with wavelength of light (λ) in the ultravioletvisible region. Investigating over 800 absorption spectra of water samples from the tropical monsoonal Godavari estuary and the Chilika brackish water lagoon, we found that the spectral slope (S) of the 330–440 nm region (S330–440) is best suited to retrieve CDOM and its exponential character.

Keywords


CDOM, Chilika Lagoon, Godavari Estuary, Spectral Slope, S330–440, UV-Visible Absorbance.

References





DOI: https://doi.org/10.18520/cs%2Fv114%2Fi08%2F1762-1767