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Climate of the Past An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/cp-2016-42
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
06 Apr 2016
Review status
This discussion paper has been under review for the journal Climate of the Past (CP). The manuscript was not accepted for further review after discussion.
Chemical composition of soluble and insoluble particles around the last termination preserved in the Dome C ice core, inland Antarctica
Ikumi Oyabu1,2, Yoshinori Iizuka1, Eric Wolff3, and Margareta Hansson4 1Institute of Low Temperature Science, Hokkaido Unive rsity, Sapporo 060-0819, Japan
2National Institute of Polar Research, Tokyo 190-8518, Japan
3Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK
4Department of Physical Geography, Stockholm University, Stockholm 106 91, Sweden
Abstract. Knowing the chemical composition of particles preserved in polar ice sheets is useful for understanding past atmospheric chemistry. Recently, several studies have examined the chemical compositions of soluble salt particles preserved in ice cores from inland and peripheral regions in both Antarctica (Dome Fuji and Talos Dome) and Greenland (NEEM). On the other hand, there is no study that compares salt compositions between different sites in inland Antarctica. This study examines the chemical compositions of soluble salt particles around the last termination in the Dome C ice core, and compares them to those from Dome Fuji. Particles larger than 0.45 μm are obtained from the ice core by an ice sublimation method, and their chemical compositions are analyzed using scanning electron microscopy and energy dispersive X-ray spectroscopy. The major soluble salt particles are CaSO4, Na2SO4, and NaCl, which is the same as that from the Dome Fuji ice core. Time-series changes in the composition of these salts are similar to those for the Dome Fuji ice core. Specifically, from 25 to 18 ka, the ratio of NaCl to Na2SO4 is variable, but generally the CaSO4 and NaCl fractions are high and the Na2SO4 fraction is low. Between 18 and 17 ka, the CaSO4 and NaCl fractions decrease and the Na2SO4 fraction increases. Between 16 and 6.8 ka, the CaSO4 and NaCl fractions are low and Na2SO4 fraction is high. However, the sulfatization rate of NaCl at Dome C is higher than that at Dome Fuji. We argue that this higher rate arises because at Dome C more SO42− is available for NaCl to form Na2SO4 due to a lower concentration of Ca2+.

Citation: Oyabu, I., Iizuka, Y., Wolff, E., and Hansson, M.: Chemical composition of soluble and insoluble particles around the last termination preserved in the Dome C ice core, inland Antarctica, Clim. Past Discuss., https://doi.org/10.5194/cp-2016-42, 2016.
Ikumi Oyabu et al.
Ikumi Oyabu et al.

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This study presented the chemical compositions of non-volatile particles around the last termination in the Dome C ice core by using the sublimation-EDS method. The major soluble salt particles are CaSO4, Na2SO4, and NaCl, and time-series changes in the composition of these salts are similar to those for the Dome Fuji ice core. However, some differences occurred. The sulfatization rate of NaCl at Dome C is higher than that at Dome Fuji.
This study presented the chemical compositions of non-volatile particles around the last...
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