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The Cryosphere An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/tc-2017-148
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
01 Aug 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal The Cryosphere (TC).
Spatial and temporal variability of sea-salts in ice cores and snow pits from Fimbul Ice Shelf, Antarctica
Carmen Paulina Vega1,2,a,b, Elisabeth Isaksson1, Elisabeth Schlosser3,4, Dmitry Divine1, Tõnu Martma5, Robert Mulvaney6, Anja Eichler7, and Margit Schwikowski7 1Norwegian Polar Institute, N-9296 Tromsø, Norway
2Department of Earth Sciences, Uppsala University, Villavägen 16, SE-752 36, Uppsala, Sweden
3Institute of Atmospheric and Cryospheric Sciences, University of Innsbruck, Innsbruck, Austria
4Austrian Polar Research Institute, Vienna, Austria
5Department of Geology, Tallinn University of Technology, Tallinn, Estonia
6British Antarctic Survey, Madingley Road, High Cross, Cambridge, Cambridgeshire CB3 0ET, United Kingdom
7Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
anow at: School of Physics, University of Costa Rica, San Pedro de Montes de Oca, 11501-2060 San Jose, Costa Rica
bnow at: Centre for Geophysical Research, University of Costa Rica, San Pedro de Montes de Oca, 11501-2060 San Jose, Costa Rica
Abstract. Major ions were analysed in three firn cores from different ice rises located at Fimbul Ice Shelf (FIS): Kupol Ciolkovskogo (KC), Kupol Moskovskij (KM), and Blåskimen Island (BI), a 100 m long core drilled near the FIS edge (S100), and five snow pits (M1, M2, G3, G4, and G5) sampled on the ice shelf. These sites are distributed over the entire FIS area so that they provide a variety of elevation and distance to the sea. Sea-salt species (mainly Na+ and Cl) generally dominate the precipitation chemistry in the study region. Concentrations of these ions were found to decrease with latitude and distance from the sea. We associate a significant six-fold increase in sea-salts observed in the S100 core after the 1950s with a change in deposition regime. This increase in sea-salt concentrations is synchronous with a shift in non-sea-salt sulfate (nssSO42−) toward negative values, suggesting a possible contribution of fractionated aerosol to the sea-salt load in the S100 core most likely by dry deposition. In contrast, wet deposition of atmospheric sea-salts is dominant in the three ice rises cores, and no evidence of a significant contribution of fractionated sea-salt to these sites was found. In summary, these results suggest that the S100 core contains a more local sea-salt signal, dominated by processes during sea-ice formation in the neighbouring waters. In contrast, the ice rises cores register the larger-scale signal of atmospheric flow conditions and transport of sea-salt aerosols produced over open water rather than local changes in sea-ice, wind-blown snow accumulated over sea-ice, and frost flower formation. These findings are a contribution to the understanding of the mechanisms behind sea-salt aerosol production, transport and deposition at coastal Antarctic sites, and for the improvement of the current Antarctic sea-ice reconstructions based on sea-salt chemical proxies obtained from ice cores.
Citation: Vega, C. P., Isaksson, E., Schlosser, E., Divine, D., Martma, T., Mulvaney, R., Eichler, A., and Schwikowski, M.: Spatial and temporal variability of sea-salts in ice cores and snow pits from Fimbul Ice Shelf, Antarctica, The Cryosphere Discuss., https://doi.org/10.5194/tc-2017-148, in review, 2017.
Carmen Paulina Vega et al.
Carmen Paulina Vega et al.
Carmen Paulina Vega et al.

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Short summary
Ions were measured in firn and ice cores from Fimbul Ice Shelf, Antarctica, to evaluate sea-salt loads. A significant six-fold increase in sea-salts was found in the S100 core after 1950s which suggests that it contains a more local sea-salt signal, dominated by processes during sea-ice formation in the neighbouring waters. In contrast, firn cores from three ice rises register the larger-scale signal of atmospheric flow conditions and transport of sea-salt aerosols produced over open water.
Ions were measured in firn and ice cores from Fimbul Ice Shelf, Antarctica, to evaluate sea-salt...
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