FN Archimer Export Format
PT J
TI Method for the determination of preferential orientation of marine particles from laser diffraction measurements
BT 
AF FONT MUNOZ, Joan Salvador
   Jeanneret, Raphaël
   Tuval, Idan
   Basterretxea, Gotzon
AS 1:1,2;2:3;3:4,5;4:4;
FF 1:;2:;3:;4:;
C1 IFREMER, French Institute for Sea Research, DYNECO PELAGOS, 29280, Plouzané, France
   Université de Brest - UBO/CNRS/IFREMER/IRD, 29238, Brest, France
   Laboratoire de Physique de l’Ecole normale supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université de Paris, F-75005 Paris, France
   Dept. of Marine Ecology. IMEDEA (UIB-CSIC). Miquel Marques 21, 07190. Esporles, Balearic Islands, Spain
   Dept. of Physics. University of the Balearic Islands, Ctra. Valldemossa Km. 7.5, 07122, Palma, Balearic Islands, Spain
C2 IFREMER, FRANCE
   UBO, FRANCE
   ENS, FRANCE
   IMEDEA, SPAIN
   UNIV ILLES BALEARS, SPAIN
SI BREST
SE PDG-ODE-DYNECO
IN WOS Ifremer UPR
   DOAJ
   copubli-france
   copubli-europe
   copubli-univ-france
IF 3.894
TC 7
UR https://archimer.ifremer.fr/doc/00625/73683/73147.pdf
LA English
DT Article
AB In situ laser diffractometry (LD) is increasingly used in oceanographic studies to estimate sediment transport, particle fluxes and to assess the concentration of marine phytoplankton. It enables an accurate characterization of the size distribution of suspended particles from the scattering signal produced by their interaction with a collimated laser beam. LD reliably reflects the sizes of suspensions dominated by nearly spherical particles; however, when complex particle morphologies dominate the suspension (e.g. phytoplankton) the resulting particle size distribution (PSD) may present significant variations attributed to different factors. In particular, the orientation of non-spherical particles - which abound in the sea – modifies LD measurements of PSDs. While this may be interpreted as a drawback for some studies (i.e. when precise measurement of the volume concentration is required), we propose that detailed analysis of this signal provides information on particle orientation. We use PDMS micropillars with prescribed elliptical cross-sections to experimentally determine the dependence between the spatial orientation of elongated particles and changes in the PSD measured with a LISST laser diffractometer. We show that LD can be used to adequately characterize the different dimensions of the non-spherical particles at specific orientations. Using this property, we describe and validate a method to infer the preferential orientation of particles in the sea. Our study opens new perspectives in the use of in-situ LD in ocean research. 
PY 2020
PD APR
SO Optics Express
SN 1094-4087
PU The Optical Society
VL 28
IS 9
UT 000530854700125
BP 14085
EP 14099
DI 10.1364/OE.390388
ID 73683
ER

EF