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dc.contributor.authorAntony, R.
dc.contributor.authorWilloughby, A.S.
dc.contributor.authorGrannas, A.M.
dc.contributor.authorCatanzano, V.
dc.contributor.authorSleighter, R.L.
dc.contributor.authorThamban, M.
dc.contributor.authorHatcher, P.G.
dc.contributor.authorNair, S.
dc.date.accessioned18/2/2019
dc.date.accessioned2019-02-18T20:16:33Z
dc.date.available18/4/2017
dc.date.available2019-02-18T20:16:33Z
dc.date.issued2017
dc.identifier.citationEnvironmental Science & Technology, vol.51(8); 2017; 4328-4337
dc.identifier.issn1520-5851
dc.identifier.urihttps://doi.org/10.1021/acs.est.6b05780
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/7904
dc.description.abstractSnow overlays the majority of Antarctica and is an important repository of dissolved organic matter (DOM). DOM transformations by supraglacial microbes are not well understood. We use ultrahigh resolution mass spectrometry to elucidate molecular changes in snowpack DOM by in situ microbial processes (up to 55 days) in a coastal Antarctic site. Both autochthonous and allochthonous DOM is highly bioavailable and is transformed by resident microbial communities through parallel processes of degradation and synthesis. DOM thought to be of a more refractory nature, such as dissolved black carbon and carboxylic-rich alicyclic molecules, was also rapidly and extensively reworked. Microbially reworked DOM exhibits an increase in the number and magnitude of N-, S-, and P-containing formulas, is less oxygenated, and more aromatic when compared to the initial DOM. Shifts in the heteroatom composition suggest that microbial processes may be important in the cycling of not only C, but other elements such as N, S, and P. Microbial reworking also produces photoreactive compounds, with potential implications for DOM photochemistry. Refined measurements of supraglacial DOM and their cycling by microbes is critical for improving our understanding of supraglacial DOM cycling and the biogeochemical and ecological impacts of DOM export to downstream environments
dc.languageen
dc.publisherAmerican Chemical Society
dc.relation.isreferencedbySCI
dc.titleMolecular Insights on Dissolved Organic Matter Transformation by Supraglacial Microbial Communities
dc.typeJournal Article
dc.affiliation.authorNational Centre for Antarctic and Ocean Research, Headland Sada, Vasco-Da-Gama, Goa 403 804,�India


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