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Title

Fluorescent organic matter dynamics induced by inputs of different types of dust. An experimental approach

AuthorsSanchez-Perez, Elvia D. ; Marín, Isabel ; Nunes, Sdena ; Estrada, Marta ; Peters, Francesc ; Pujo-Pay, Mireille; Conan, Pascal; Marrasé, Cèlia
Issue Date17-Nov-2014
Citation2nd International Ocean Research Conference (2014)
AbstractA small fraction of coloured dissolved organic matter (CDOM) can emit blue light when excited by ultraviolet radiation. This fraction is called fluorescent dissolved organic matter (FDOM). Optical spectrometry can be used to characterize this fraction and to study the distribution, and dynamics of dissolved organic matter. Using a combination of different pairs of excitation-emission (EX/EM) wavelengths we can determine different group of compounds: (340/440) peak-C terrestrial-humic, (220/410) peak-M marine-humic, (280/350) peak-T protein-like and (250/435) peak-A humic-like. We conducted three experiments to determine the impact of different type of atmospheric dust (urban and Sahara dust) in dynamics of FDOM in coastal seawaters. Water was collected 0.5 km offshore of Barcelona beach (NW Mediterranean Sea) and distributed in 6 microcosms, subject to experimental conditions in a light-dark and temperature during 8 days. Two microcosms contained Sahara dust (S), two other contained urban dust (A) and two were kept as controls (K). The S microcosms presented marked fluorescence at humic-like and protein-like peaks during the course of the incubation with maximum values of 2.8 and 2.3 QSU respectively. In contrast, the microcosm with urban dust showed lower values (1.9 and 1.3 QSU respectively). We will discuss the contrasting FDOM and CDOM dynamics in the different experimental conditions in relation to the plankton responses
Description2nd International Ocean Research Conference, One planet one ocean, 17-21 November 2014, Barcelona, Spain
Publisher version (URL)http://www.iocunesco-oneplanetoneocean.fnob.org/
URIhttp://hdl.handle.net/10261/125158
Appears in Collections:(ICM) Comunicaciones congresos
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