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On the Chemical Dynamics of Extracellular Polysaccharides in the High Arctic Surface Microlayer : Volume 8, Issue 4 (05/07/2012)

By Gao, Q.

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Book Id: WPLBN0004020584
Format Type: PDF Article :
File Size: Pages 18
Reproduction Date: 2015

Title: On the Chemical Dynamics of Extracellular Polysaccharides in the High Arctic Surface Microlayer : Volume 8, Issue 4 (05/07/2012)  
Author: Gao, Q.
Volume: Vol. 8, Issue 4
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Leck, C., Matrai, P. A., Rauschenberg, C., & Gao, Q. (2012). On the Chemical Dynamics of Extracellular Polysaccharides in the High Arctic Surface Microlayer : Volume 8, Issue 4 (05/07/2012). Retrieved from http://worldebookfair.org/


Description
Description: Department of Meteorology, Stockholm University, 10691 Stockholm, Sweden. The surface microlayer (SML) represents a unique system of which the physicochemical characteristics may differ from those of the underlying subsurface seawater (SSW). Within the Arctic pack ice area, the SML has been characterized as enriched in small colloids of biological origin, resulting from extracellular polymeric secretions (EPS). During the Arctic Summer Cloud Ocean Study (ASCOS) in August 2008, particulate organic matter (POM, with size range > 0.22 μm) and dissolved organic matter (DOM, < 0.22 μm, obtained after filtration) samples were collected and chemically characterized from the SML and the corresponding SSW at an open lead centered at 87.5° N and 5° E. Total organic carbon was persistently enriched in the SML with a mean enrichment factor (EF) of 1.45 ± 0.41, whereas sporadic depletions of dissolved carbohydrates and amino acids were observed. Monosaccharide compositional analysis reveals that EPS in the Arctic lead was formed mainly of distinctive heteropolysaccharides, enriched in xylose, fucose and glucose. The mean concentrations of total hydrolysable neutral sugars in SSW were 94.9 ± 37.5 nM in high molecular weight (HMW) DOM (> 5 kDa) and 64.4 ± 14.5 nM in POM. The enrichment of polysaccharides in the SML appeared to be a common feature, with EFs ranging from 1.7 to 7.0 for particulate polysaccharides and 3.5 to 12.1 for polysaccharides in the HMW DOM fraction. A calculated monosaccharide yield suggests that polymers in the HMW DOM fraction were scavenged, without substantial degradation, into the SML. Bubble scavenging experiments showed that newly aggregated particles could be formed abiotically by coagulation of low molecular weight nanometer-sized gels. Aerosol particles, artificially generated by bubbling experiments, were enriched in polysaccharides by factors of 22–70, relative to the source seawater. We propose that bubble scavenging of surface-active polysaccharides could be one of the possible mechanisms for the enrichment of polysaccharides in the high Arctic open lead SML.

Summary
On the chemical dynamics of extracellular polysaccharides in the high Arctic surface microlayer

Excerpt
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