Mean snow accumulation rate, and mean methane sulfonate, chloride and nitrate concentration in snow pits and firn cores of Dronning Maud Land ...

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 a...

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Bibliographic Details
Main Authors: Weller, Rolf, Traufetter, Fidan, Fischer, H, Oerter, Hans, Piel, Claudia, Miller, Heinz
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2004
Subjects:
Atmospheric Chemistry @ AWI AWI_AC
European Project for Ice Coring in Antarctica EPICA
Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158
Antarctic
Arctic
Dronning Maud Land
Weller
Antarc*
Antarctica
DML
EPICA
Sea ice
Online Access:https://dx.doi.org/10.1594/pangaea.855383
https://doi.pangaea.de/10.1594/PANGAEA.855383
Description
Summary: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, ... : Supplement to: Weller, Rolf; Traufetter, Fidan; Fischer, H; Oerter, Hans; Piel, Claudia; Miller, Heinz (2004): 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. Journal of Geophysical Research, 109(D7) ...

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