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Title: Technical Note: Dissolved organic matter fluorescence a finite mixture approach to deconvolve excitation-emission matrices
Author: Butturini, Andrea
Ejarque, E.
Keywords: Ecologia aquàtica
Nutrients (Medi ambient)
Aquatic ecology
Nutrients (Ecology)
Issue Date: 6-Sep-2013
Publisher: European Geosciences Union
Abstract: The analysis of the shape of excitation-emission matrices (EEMs) is a relevant tool for exploring the origin, transport and fate of dissolved organic matter (DOM) in aquatic ecosystems. Within this context, the decomposition of EEMs is acquiring a notable relevance. A simple mathematical algorithm that automatically deconvolves individual EEMs is described, creating new possibilities for the comparison of DOM fluorescence properties and EEMs that are very different from each other. A mixture model approach is adopted to decompose complex surfaces into sub-peaks. The laplacian operator and the Nelder-Mead optimisation algorithm are implemented to individuate and automatically locate potential peaks in the EEM landscape. The EEMs of a simple artificial mixture of fluorophores and DOM samples collected in a Mediterranean river are used to describe the model application and to illustrate a strategy that optimises the search for the optimal output.
Note: Reproducció del document publicat a:
It is part of: Biogeosciences, 2013, vol. 10 , p. 5875 -5887
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ISSN: 1726-4170
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

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