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Betancur Turizo, Stella Patricia and Rivero, Joaquín. (2020). Variability of spectral slope of the cromophoric dissolved organic matter (CDOM) in the multi-annual monitoring Antares Station, Cartagena. Bol. Cient. CIOH, 39 (2). 03-15. doi https://doi.org/10.26640/22159045.2020.506

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Abstract

The study of the spectral slope of Chromophoric Dissolved Organic Matter (SCDOM) in optically complex waters is important to understand its role in biogeochemical cycles and the attenuation of light in the water column, given the spectral dependence it has with the coefficient of absorption of Chromophoric Dissolved Organic Matter (aCDOM (λ)) since it provides information on the nature of the chromophores thereof. In this study we document the temporal variability of SCDOM in a fixed bi-monthly monitoring station located at 10° 24' 32'' N and 75° 45' 34'' W, 10 km from the west coast of Tierra Bomba Island in Cartagena, Colombia. This analysis was based on the evaluation of the differences between absorption coefficients of the aCDOM (λ) and the SCDOM estimated in six monitoring periods developed between March 2019 and February 2020. The values obtained are the first to be reported for the region and seek to identify if the Antares station sensitive to the presence of water bodies representative of zonal and seasonal processes that could affect the nature and origin of the measured CDOM. As preliminary results, a surface layer (<20 m) was found with a dynamism associated with the seasonality of the study area, with low SCDOM values associated with the dry season, and high slopes associated with the rainy season, with maximums registered for 8 June, 2019. For the deep water bodies (> 40 m) the variability of aCDOM (λ) and SCDOM were associated with biological activity in the area. In particular, this work contributes to the knowledge of the optical properties and its contribution towards the definition of spectral slopes of CDOM for the region.

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Item Type:	Article
Uncontrolled Keywords:	CDOM. Variabilidad temporal. Propiedades ópticas. Aguas oceánicas. Aguas costeras
Geographical coverage :	Colombia. Cartagena. Isla Tierrabomba
Depositing User:	Dirección General Marítima
ISSN:	2215-9045
Official URL:	https://ojs.dimar.mil.co/index.php/CIOH/article/vi...
Identification Number:	https://doi.org/10.26640/22159045.2020.506

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