| Summary: | Reconstructions of paleoatmospheric H 2 using polar firn air and ice cores would lead to a better understanding of the H 2 biogeochemical cycle and how it is influenced by climate change and human activity. H 2 is a small, highly diffusive molecule, and its mobility in the ice matrix must be accounted for when intepreting polar firn air and ice core measurements. Previous work on the mobility of H 2 in ice has focused on warm (272-273 K), high pressure systems that are not directly comparable to conditions in polar ice sheets. In this study, the permeability, diffusivity, and solubility of H 2 are determined experimentally in ice Ih at temperatures relevant to polar ice sheets (199-253 K). The data are reported as the optimized diffusivity (m 2 s -1 ), solubility (mol m -3 Pa -1 ), and permeability (mol m -1 s -1 Pa -1 ) for each of 17 experiments using two different samples of ice. Optimized values are reported with their ±1σ uncertainties. The temperature (K) for each experiment is also reported. Funding provided by: National Science Foundation Crossref Funder Registry ID: http://dx.doi.org/10.13039/100000001 Award Number: OPP-1908974
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