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| Titel |
Intermittent particle dynamics in marine coastal waters |
| VerfasserIn |
P. R. Renosh, F. G. Schmitt, H. Loisel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2198-5634
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics Discussions ; 2, no. 4 ; Nr. 2, no. 4 (2015-07-18), S.1033-1060 |
| Datensatznummer |
250115182
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| Publikation (Nr.) |
 copernicus.org/npgd-2-1033-2015.pdf |
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| Zusammenfassung |
| Marine coastal processes are highly variable over different space and time scales.
In this paper we analyse the intermittency properties of particle size distribution (PSD) recorded every second using a LISST instrument (Laser In-Situ Scattering and Transmissometry).
The particle concentrations have been recorded over 32 size classes from 2.5 to 500 μm, at 1 Hz resolution.
Such information is used to estimate at each time step the hyperbolic slope of the particle size distribution, and to consider its dynamics.
Shannon entropy, as an indicator of the randomness, is estimated at each time step and its dynamics is analysed.
Furthermore, particles are separated into four classes according to their size, and the intermittent properties of these classes are considered.
The empirical mode decomposition (EMD) is used, associated with arbitrary order Hilbert spectral analysis (AHSA), in order to retrieve scaling multi-fractal moment functions, for scales from 10 s to 8 min.
The intermittent properties of two other indicators of particle concentration are also considered on the same range of scales: the total volume concentration Cvol-total and the particulate beam attenuation coefficient cp(670).
Both show quite similar intermittent dynamics and are characterized by the same exponents.
Globally we find here negative Hurst exponents for each time series considered, and nonlinear moment functions. |
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