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Selective incorporation of dissolved organic matter (DOM) during sea ice formation

Müller, S and Vähätalo, AV and Stedmon, CA and Granskog, MA and Norman, L and Aslam, SN and Underwood, GJC and Dieckmann, GS and Thomas, DN (2013) 'Selective incorporation of dissolved organic matter (DOM) during sea ice formation.' Marine Chemistry, 155. 148 - 157. ISSN 0304-4203

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Abstract

This study investigated the incorporation of DOM from seawater into <. 2. day-old sea ice in tanks filled with seawater alone or amended with DOM extracted from the microalga, Chlorella vulgaris. Optical properties, including chromophoric DOM (CDOM) absorption and fluorescence, as well as concentrations of dissolved organic carbon (DOC), dissolved organic nitrogen (DON), dissolved carbohydrates (dCHOs) and dissolved uronic acids (dUAs) were measured. Enrichment factors (EFs), calculated from salinity-normalized concentrations of DOM in bulk ice, brine and frost flowers relative to under-ice water, were generally >. 1. The enrichment factors varied for different DOM fractions: EFs were the lowest for humic-like DOM (1.0-1.39) and highest for amino acid-like DOM (1.10-3.94). Enrichment was generally highest in frost flowers with there being less enrichment in bulk ice and brine. Size exclusion chromatography indicated that there was a shift towards smaller molecules in the molecular size distribution of DOM in the samples collected from newly formed ice compared to seawater. Spectral slope coefficients did not reveal any consistent differences between seawater and ice samples. We conclude that DOM is incorporated to sea ice relatively more than inorganic solutes during initial formation of sea ice and the degree of the enrichment depends on the chemical composition of DOM. © 2013 Elsevier B.V.

Item Type: Article
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science and Health > Biological Sciences, School of
Depositing User: Users 161 not found.
Date Deposited: 09 Jan 2015 11:49
Last Modified: 30 Jan 2019 16:18
URI: http://repository.essex.ac.uk/id/eprint/10481

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