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• W2057454943 abstract "We quantified postdepositional losses of methane sulfonate (MSA − ), nitrate, and chloride at the European Project for Ice Coring in Antarctica (EPICA) drilling site in Dronning Maud Land (DML) (75°S, 0°E). Analyses of four intermediate deep firn cores and 13 snow pits were considered. We found that about 26 ± 13% of the once deposited nitrate and typically 51 ± 20% of MSA − were lost, while for chloride, no significant depletion could be observed in firn older than one year. Assuming a first order exponential decay rate, the characteristic e ‐folding time for MSA − is 6.4 ± 3 years and 19 ± 6 years for nitrate. It turns out that for nitrate and MSA − the typical mean concentrations representative for the last 100 years were reached after 5.4 and 6.5 years, respectively, indicating that beneath a depth of around 1.2–1.4 m postdepositional losses can be neglected. In the area of investigation, only MSA − concentrations and postdepositional losses showed a distinct dependence on snow accumulation rate. Consequently, MSA − concentrations archived at this site should be significantly dependent on the variability of annual snow accumulation, and we recommend a corresponding correction. With a simple approach, we estimated the partial pressure of the free acids MSA, HNO 3 , and HCl on the basis of Henry's law assuming that ionic impurities of the bulk ice matrix are localized in a quasi‐brine layer (QBL). In contrast to measurements, this approach predicts a nearly complete loss of MSA − , NO 3 − , and Cl − ." @default.
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• W2057454943 date "2004-04-01" @default.
• W2057454943 modified "2023-10-14" @default.
• W2057454943 title "Postdepositional losses of methane sulfonate, nitrate, and chloride at the European Project for Ice Coring in Antarctica deep-drilling site in Dronning Maud Land, Antarctica" @default.
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• W2057454943 doi "https://doi.org/10.1029/2003jd004189" @default.
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