SPECTRAL SLOPE VARIABILITY OF THE CROMOPHORIC DISSOLVED ORGANIC MATTER (CDOM) IN THE MULTI-ANNUAL MONITORING ANTARES STATION, CARTAGENA
DOI:
https://doi.org/10.26640/22159045.2020.506Keywords:
CDOM; temporal variability; Optical properties; coastal waters; oceanic watersAbstract
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 () and the SCDOM estimated in four monitoring periods developed between March and August 2019. 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 found in the surface samples of 8 June 2019. For the deep water bodies (> 40 m) the variability of aCDOM () 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.Downloads
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References
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Blough, N.V., Del Vecchio, R., (2002). Chromophoric DOM in the Coastal Environment, In “Biogeochemistry of Marine Dissolved Organic Matter” (D. A Hansell and CA Carlson, Eds.). Academic Press, San Diego.
Brezonik, P. L., Olmanson, L. G., Finlay, J. C., and Bauer, M. E. (2015). Factors affecting the measurement of CDOM by remote sensing of optically complex inland waters. Remote Sensing of Environment, 157, 199-215. https://doi.org/10.1016/j.rse.2014.04.033
Carder, K. L., R. G. Steward, G. R. Harvey, and P. B. Ortner, 91989). Marine humic and fulvic acids: Their effects on remote sensing of ocean chlorophyll, Limnol. Oceanogr., 34(1), 68– 81.
Del Vecchio, R., & Blough, N. V. (2002). Photobleaching of chromophoric dissolved organic matter in natural waters: kinetics and modeling. Marine Chemistry, 78(4), 231-253.
Effler, S. W., Perkins, M., Peng, F., Strait, C., Weidemann, A. D., & Auer, M. T. (2010). Light-absorbing components in Lake Superior. Journal of Great Lakes Research, 36(4), 656-665.
Hu, C., Montgomery, E. T., Schmitt, R. W., & Muller-Karger, F. E. (2004). The dispersal of the Amazon and Orinoco River water in the tropical Atlantic and Caribbean Sea: Observation from space and S-PALACE floats. Deep Sea Research Part II: Topical Studies in Oceanography, 51(10-11), 1151-1171.
Maza, M., Voulgaris, G., & Subrahmanyam, B. (2006). Subtidal inner shelf currents off Cartagena de Indias, Caribbean coast of Colombia. Geophysical research letters, 33(21).
Mitchell, B. G., Kahru, M., Wieland, J., Stramska, M., and Mueller, J. L. (2002). Determination of spectral absorption coefficients of particles, dissolved material and phytoplankton for discrete water samples. Ocean optics protocols for satellite ocean color sensor validation, Revision, 3, 231–257.
Moreno Calderon, Martiza; Pico Hernandez, Sergio Andres; Dagua Paz, Claudia Janeth y Herrera Moyano, Diana Patricia (2019). Boletín Meteomarino Mensual del Caribe Colombiano (No.75/Marzo de 2019, No.76/Abril de 2019, No.77/Mayo de 2019, No.78/Junio de 2019, No.80/Agosto de 2019) Cartagena de Indias D.T. y C., Colombia: Dirección General Marítima.
Muller-Karger, F. E., McClain, C. R., & Richardson, P. L. (1988). The dispersal of the Amazon's water. Nature, 333(6168), 56.
Nelson, N. B., and Siegel, D. A. (2002). Chromophoric DOM in the open ocean. Biogeo-chemistry of marine dissolved organic matter, 547-578.
Riddick, C. A., Hunter, P. D., Tyler, A. N., Martinez‐Vicente, V., Horváth, H., Kovács, A. W., ... & Présing, M. (2015). Spatial variability of absorption coefficients over a biogeochemical gradient in a large and optically complex shallow lake. Journal of Geophysical Research: Oceans, 120(10), 7040-7066.
Schlitzer, R., (2016) Ocean Data View, https//odv.awi.de, 2016.
Siegel, D. A., Maritorena, S., Nelson, N. B., Hansell, D. A., and Lorenzi‐Kayser, M. (2002). Global distribution and dynamics of colored dissolved and detrital organic materials. Journal of Geophysical Research: Oceans, 107. https://doi.org/10.1029/2001JC000965
Twardowski, M. S., Boss, E., Sullivan, J. M., & Donaghay, P. L. (2004). Modeling the spectral shape of absorption by chromophoric dissolved organic matter. Marine Chemistry, 89(1-4), 69-88.
Vodacek, A., N. V. Blough, M. D. DeGrandpre, E. T. Peltzer, and R. K. Nelson (1997). Seasonal variation of CDOM and DOC in the middle Atlantic Bight: Terrestrial inputs and photooxidation, Limnol. Oceanogr., 42(4), 674– 686.
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2020-12-30
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How to Cite
SPECTRAL SLOPE VARIABILITY OF THE CROMOPHORIC DISSOLVED ORGANIC MATTER (CDOM) IN THE MULTI-ANNUAL MONITORING ANTARES STATION, CARTAGENA. (2020). CIOH Scientific Bulletin, 39(2), 3-15. https://doi.org/10.26640/22159045.2020.506
