Influence of suspended particulate matter on salinity measurements

Held, Philipp, Kegler, Philip and Schrottke, Kerstin (2014) Influence of suspended particulate matter on salinity measurements Continental Shelf Research, 85 . pp. 1-8.

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Salinity is a very important parameter in marine science, which is normally measured via the electrical conductivity of sea water. Suspended Particular Matter (SPM) can influence salinity measurements but so far there had been no experimental studies to test this. In this paper a new laboratory study about the influence of SPM on conductivity based salinity measurements is presented. Different sensor types were deployed to investigate the influence of the conductivity sensor design on the observed salinity deviations. The role of clay minerals was additionally analysed. Two natural mud samples of different origins were used to set up various SPM concentrations. The results have shown that high suspended sediment concentrations (up to 300 g l(-1)) can distort salinity measurements up to 30%. On average only 22% of the observed salinity deviation could be explained by the adsorption of ions by clay minerals. The CTD cell geometry had no verifiable effect, in the resolution limits of the instruments. The observed salinity deviations were caused by a "blinding effect" of the sensor due to the dissolved particles. (C) 2014 Elsevier Ltd. All rights reserved.

Document Type: Article
Additional Information: Times Cited: 0 0
Research affiliation: Kiel University
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
ISSN: 0278-4343
Projects: Future Ocean
Date Deposited: 30 Mar 2015 12:20
Last Modified: 08 Feb 2018 13:18

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