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| Titel |
Technical Note: Dissolved organic matter fluorescence – a finite mixture approach to deconvolve excitation-emission matrices |
| VerfasserIn |
A. Butturini, E. Ejarque |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 9 ; Nr. 10, no. 9 (2013-09-06), S.5875-5887 |
| Datensatznummer |
250085324
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| Publikation (Nr.) |
 copernicus.org/bg-10-5875-2013.pdf |
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| Zusammenfassung |
| 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. |
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