Characteristics of dissolved organic matter in baltic coastal sea ice: Allochthonous or autochthonous origins?

Colin A. Stedmon, David N. Thomas, Mats Granskog, Hermanni Kaartokallio, Stathys Papadimitriou, Harri Kuosa

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The origin of dissolved organic matter (DOM) within sea ice in coastal waters of the Baltic Sea was investigated using parallel factor (PARAFAC) analysis of DOM fluorescence. Sea ice DOM had distinctly different fluorescence characteristics than that of the underlying humic-rich waters and was dominated by protein-like fluorescence signals. PARAFAC analysis identified five fluorescent components, all of which were present in both sea ice and water. Three humic components were negatively correlated to salinity and concluded to be terrestrially derived material. Baltic Sea ice DOM was found to be a mixture of humic material from the underlying water column incorporated during ice formation and autochthonous material produced by organisms within the ice. Dissolved organic carbon (DOC) and nitrogen (DON) concentrations were correlated to the humic fluorescence, indicating that the majority of the organic carbon and nitrogen in Baltic Sea ice is bound in terrestrial humic material trapped within the ice. This has implications for our understanding of sea ice carbon cycling in regions influenced by riverine input (e.g., Baltic and Arctic coastal waters), as the susceptibility of DOM to degradation and remineralization is largely determined by its source. © 2007 American Chemical Society.
Original languageEnglish
JournalEnvironmental Science & Technology (Washington)
Volume41
Issue number21
Pages (from-to)7273-7279
ISSN0013-936X
DOIs
Publication statusPublished - 2007
Externally publishedYes

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