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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2017-100
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
02 Mar 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Sea ice as a source of sea salt aerosol to Greenland ice cores: a model-based study
Rachael H. Rhodes1, Xin Yang2, Eric W. Wolff1, Joseph R. McConnell3, and Markus M. Frey2 1Department of Earth Sciences, University of Cambridge, Cambridge, CB2 3EQ, UK
2British Antarctic Survey, Natural Environment Research Council, Cambridge, CB3 0ET, UK
3Division of Hydrologic Sciences, Desert Research Institute, Reno NV, 89512, USA
Abstract. Growing evidence suggests that the sea ice surface is an important source of sea salt aerosol and this has significant implications for polar climate and atmospheric chemistry. It also offers the opportunity to use ice core sea salt records as proxies for past sea ice extent. To explore this possibility in the Arctic region, we use a chemical transport model to track the emission, transport and deposition of sea salt from both the open ocean and the sea ice, allowing us to assess the relative importance of each. Our results confirm the importance of sea ice sea salt (SISS) to the winter Arctic aerosol burden. For the first time, we explicitly simulate the sea salt concentrations of Greenland snow and find they match high resolution Greenland ice core records to within a factor of two. Our simulations suggest that SISS contributes to the winter maxima in sea salt characteristic of ice cores across Greenland. A north-south gradient in the contribution of SISS relative to open ocean sea salt (OOSS) exists across Greenland, with 50 % of sea salt being SISS at northern sites such as NEEM, while only 10 % of sea salt is SISS at southern locations such as ACT10C. Our model shows some skill at reproducing the inter-annual variability in sea salt concentrations for 1991–1999 AD, particularly at Summit where up to 62 % of the variability is explained. Future work will involve constraining what is driving this inter-annual variability and operating the model under different paleoclimatic conditions.

Citation: Rhodes, R. H., Yang, X., Wolff, E. W., McConnell, J. R., and Frey, M. M.: Sea ice as a source of sea salt aerosol to Greenland ice cores: a model-based study, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2017-100, in review, 2017.
Rachael H. Rhodes et al.
Rachael H. Rhodes et al.
Rachael H. Rhodes et al.

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Short summary
We examine sea salt aerosol in the Arctic region to see how important the proposed blowing snow source from the sea ice surface is. We compare results from a chemical transport model to sea salt measurements from aerosol and Greenland ice cores. We find that blowing snow is a significant source in winter months, particularly to northern Greenland. Our results help us to understand how sea salt concentrations in Greenland ice cores may be developed as an indicator of past sea ice extent.
We examine sea salt aerosol in the Arctic region to see how important the proposed blowing snow...
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