Arctic Station Dirigibile Italia

Arctic Sea Ice and HAlogen Deposition: investigation for a new paleoclimatic tool, (ASIHAD)

Call year: 2015 Status: active IADC_id: 15

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The chemical analyses conducted on the Holtedhalfonna shallow core drilled in April 2012 show that the bromine and iodine concentrations in Svalbard depositions are related to the sea ice dynamics. Despite these preliminary but encouraging results, several issues should be pointed out and deeply analyzed. With this project we propose to investigate the halogens into aerosol, seasonal snow and firn layers in order to better understand how the sea-ice area around Svalbard influences the bromine enrichment.rnMoreover, the effect of post-depositional processes that can affect the halogens distribution into the seasonal snowpack and aged firn layers should be deeply investigated. The final goal of these investigation is to verify the sensitivity of Bromine and Iodine (species) as proxies of sea-ice extension and its applicability in the ice core science. This would lead to a very significant improvement of ourrnknowledge about sea-ice variations during the last climate cycles. In this project we plan to collect aerosol samples using a multi-stage high-volume sampler as well as to drill shallow firn cores. Seasonal surface snow sampling is also conducted with the aim to characterize the Svalbard snow cover both from the morphological and chemical point of view. The goals of this activities is to study the evolution of snowpack in the glacial and periglacial area around Ny-Alesund (such as Kongsvegen, Holtedahlfonna and Austre Brøggerbreen glacier) from the late winter to the melting period (mid February and mid May)rnin the contest of metamorphic and chemical processes acting on the Svalbard snowpack as function of climatic and meteorological parameters. Surface and snow pit samples together with stratigraphic evaluation as well as bulk snow samples will be collected. These samples will be associated with data already produce from previous activity conducted in Ny-Alesund glaciers implementing the time series of measurements available and used also for the project PeCC (PI Clara Turetta)

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Arctic Sea Ice and HAlogen Deposition: investigation for a new paleoclimatic tool, (ASIHAD)