Intermittent particle dynamics in marine coastal waters

Renosh, P. R.; Schmitt, F. G.; Loisel, Hubert

Document type :

Compte-rendu et recension critique d'ouvrage

DOI :

10.5194/npg-22-633-2015

Title :

Intermittent particle dynamics in marine coastal waters

Author(s) :

Renosh, P. R. [Auteur]
Université de Lille
Schmitt, F. G. [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Loisel, Hubert [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Université du Littoral Côte d'Opale [ULCO]

Journal title :

Nonlinear Processes in Geophysics

Pages :

633-643

Publisher :

European Geosciences Union (EGU)

Publication date :

2015-10-22

ISSN :

1023-5809

HAL domain(s) :

Planète et Univers [physics]
Planète et Univers [physics]/Sciences de la Terre

English abstract : [en]

Marine coastal processes are highly variable over different space scales and timescales. In this paper we analyse the intermittency properties of particle size distribution (PSD) recorded every second using a LISST instrument ...
Show more >Marine coastal processes are highly variable over different space scales and timescales. 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 multifractal moment functions, for scales from 10 s to 8 min. The intermittent properties of two other indicators of particle concentration are also considered in the same range of scales: the total volume concentration C<sub>vol-total</sub> and the particulate beam attenuation coefficient c<sub>p</sub>(670). Both show quite similar intermittent dynamics and are characterised by the same exponents. Globally we find here negative Hurst exponents (meaning the small scales show larger fluctuation than large scales) for each time series considered, and nonlinear moment functions.Show less >

Language :

Anglais

Popular science :

Non

Collections :

Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

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