Identification and analysis of low molecular weight dissolved organic carbon in subglacial basal ice ecosystems by ion chromatography” by E. C. O’Donnell et al. Biogeosciences Discussion comments
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چکیده
20 Determining the concentration and composition of dissolved organic carbon (DOC) in glacial 21 ecosystems is important for assessments of in situ microbial activity and contributions to 22 wider biogeochemical cycles. Nonetheless, there is limited knowledge of the abundance and 23 character of DOC in basal ice and the subglacial environment and a lack of quantitative data 24 on low molecular weight (LMW) DOC components which are believed to be highly 25 bioavailable to microorganisms. We investigated the abundance and composition of DOC in 26 subglacial environmentsbasal ice via a molecular level DOC analysis of basal ice. 27 Spectrofluorometry and a novel ion chromatographic method, which has been little utilised in 28 glacial science for LMW-DOC determinations, were employed to identify and quantify the 29
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Interactive comment on “Identification and analysis of low molecular weight dissolved organic carbon in subglacial basal ice ecosystems by ion chromatography” by E. C. Lawson et al
This paper by Lawson and co-workers reports very interesting results with regard to low molecular weight DOC (LMW-DOC) speciation and abundance in basal ice from glaciers that have different organic and lithological substrates and thermal regimes. The case is made that these LMW-DOC compounds may support and/or be a product of biogeochemical activity beneath glaciers with consequence to regiona...
متن کاملInteractive comment on “Identification and analysis of low molecular weight dissolved organic carbon in subglacial basal ice ecosystems by ion chromatography” by E. C. Lawson et al
This paper by Lawson and coworkers reports very interesting results with regard to low molecular weight DOC (LMW-DOC) speciation and abundance in basal ice from glaciers that have different organic and lithological substrates and thermal regimes. The case is made that these LMW-DOC compounds may support and/or be a product of biogeochemical activity beneath glaciers with consequence to regional...
متن کاملInteractive comment on “Identification and analysis of low molecular weight dissolved organic carbon in subglacial basal ice ecosystems by ion chromatography” by E. C. Lawson et al
line 13): FAA is used but never defined Abstract (line 25): Why “current” subglacial environments? Could you delete “current”?line 25): Why “current” subglacial environments? Could you delete “current”? I think that the term “allochthonous” is misused throughout. The overrun OC hasn’t been derived from somewhere other than its present location, as the term suggests. Allochthonous has been used ...
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Runoff from glaciers and ice sheets has been acknowledged as a potential source of bioavailable dissolved organic matter (DOM) to downstream ecosystems. This source may become increasingly significant as glacial melt rates increase in response to future climate change. Recent work has identified significant concentrations of bioavailable carbon and iron in Greenland Ice Sheet (GrIS) runoff. The...
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