Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
Volume 10, issue 9
Biogeosciences, 10, 5875–5887, 2013
https://doi.org/10.5194/bg-10-5875-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Biogeosciences, 10, 5875–5887, 2013
https://doi.org/10.5194/bg-10-5875-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Technical note 06 Sep 2013

Technical note | 06 Sep 2013

Technical Note: Dissolved organic matter fluorescence – a finite mixture approach to deconvolve excitation-emission matrices

A. Butturini and E. Ejarque A. Butturini and E. Ejarque
  • Departament d'Ecologia, Facultat de Biologia, Universitat de Barcelona (UB), Avinguda Diagonal 643, 08028 Barcelona, Spain

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.

Publications Copernicus
Download
Citation