Short communicationFormate, acetate and methanesulfonate measurements in antarctic ice: Some geochemical implications

Add time:09/06/2019    Source:sciencedirect.com

Serious contamination problems are encountered when measuring organic acids in polar ice. Using an involved experimental protocol, methanesulfonate, formate and acetate have been investigated in ice core sections from Antarctica. With CH3SO3− concentrations of a few ppb, HCOO−at a few tenths of ppb and CH3COO− around our detection limit, the organic acids represent only a small percentage of the total acidity in Antarctic ice.Analysis of the various possible sources indicates that methane is probably the major atmospheric precursor (via formaldehyde) of formate present in the ice.The significant presence of CH3SO3− in Antarctic ice confirms the preponderant role played by marine biogenic emissions in the Antarctic sulfate budget. The CH3SO3− ratio with respect to non-sea-salt sulfate is higher in Antarctic precipitation than in marine aerosol. Finally, CH3SO3− in polar ice is suggested to be a more suitable parameter than excess sulfate for the study of marine biogenic emissions in the past.

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