Spatio-temporal variability in suspended particulate matter concentration and the role of aggregation on size distribution in a coral reef lagoon

Type : ACL
Nature : Production scientifique
Au bénéfice du Laboratoire : Non
Statut de publication : Publié
Année de publication : 2008
Auteurs (7) : JOUON A OUILLON S DOUILLET Pascal LEFEBVRE Jean-pierre FERNANDEZ Jean-michel MARI Xavier FROIDEFOND J,m
Revue scientifique : Marine Geology
Volume : 256
Fascicule : 1
Pages : 36-48
DOI : 10.1016/j.margeo.2008.09.008
URL : http://ac.els-cdn.com/s0025322708002673/1-s2.0-s0025322708002673-main.pdf?_tid=ef039bc6-5083-11e4-a44f-00000aab0f26&acdnat=1412949010_11521b28890af39c66f41160a2a9697f
Abstract : This paper presents the concentration and size distribution of suspended particles in the South-West Coral reef lagoon of the island of New Caledonia. Data are provided by filtration techniques, Optical BackScattering (OBS) measurements and in situ laser diffraction particle sizing. The concentration of suspended particles increased from reef to land. A bottom nepheloid layer occurred over the entire lagoon. and was more distinct on the nearshore area. Small particles were more abundant in the bottom nepheloid layer than in the overlying water column. The concentration of suspended particles showed more variability over space than over time. Conversely. the particle size distribution of suspended particles showed more variability at a given location over a month (time variability) than at a given moment over the lagoon (space variability). Analysis showed that aggregates represented a large fraction of suspended particles. Microscope visualization and chemical analysis of a sample suggest the inclusion of a transparent exopolymeric matrix. The relative abundance of aggregates over suspended particle volume concentration was found to increase as tire quantity of suspended particle decreased. The spatial distribution of the relative abundance of aggregates suggests more aggregates proximal to coral reefs. The high concentration of aggregates at low turbidity and the spatial distribution of the relative abundance, infer that aggregation is induced by the presence of organic ligands. Unlike optical backscattering and light attenuation measurements that are size sensitive measurements of suspended particle concentration, in situ laser diffraction particle sizing provides a relevant optical measurement of suspended particulate matter in such an aggregate-dominated system. (C) 2008 Elsevier B.V. All rights reserved.
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Commentaire : Times Cited: 10 Ouillon, Sylvain/A-6292-2012; DOUILLET, Pascal/G-1176-2014 0 10
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Citation :
Jouon A, Ouillon S, Douillet P, Lefebvre J-P, Fernandez J-M, Mari X, Froidefond JM (2008) Spatio-temporal variability in suspended particulate matter concentration and the role of aggregation on size distribution in a coral reef lagoon. Mar Geol 256: 36-48 | doi: 10.1016/j.margeo.2008.09.008