气候变化领域集成服务门户(CCPortal): Diffusivity and Solubility of H2 in Ice Ih: Implications for the Behavior of H2 in Polar Ice

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DOI	10.1029/2020JD033840
	Diffusivity and Solubility of H2 in Ice Ih: Implications for the Behavior of H2 in Polar Ice
	Patterson J.D.; Saltzman E.S.
发表日期	2021
ISSN	2169897X
卷号	126 期号:10
英文摘要	Reconstructions of paleoatmospheric H2 using polar firn air and ice cores would lead to a better understanding of the H2 biogeochemical cycle and how it is influenced by climate change and human activity. In this study, the permeability, diffusivity, and solubility of H2 are determined experimentally in ice Ih at temperatures relevant to polar ice sheets (199–253 K). The experimental data are used in conjunction with simplified diffusion models to assess the implications for: (a) Diffusion of H2 from pressurized closed bubbles to open pores in polar firn, (b) diffusive smoothing of H2 gradients in the ice sheet, and (c) post-coring diffusive losses of H2 from ice core samples. The results indicate that diffusive equilibrium between open and closed pores is likely achieved in the firn lock-in zone. Diffusive smoothing of atmospheric variations is significant and should be accounted for in atmospheric reconstructions on millennial time scales. Diffusive losses from a bubbly ice sample are sufficiently slow that samples may be meaningfully analyzed for H2 after storage on the order of a year. These results suggest that the mobility of H2 in ice should not preclude the reconstruction of paleoatmospheric H2 from firn air and ice cores. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	atmospheric chemistry; gas physical properties; ice cores; paleoatmosphere
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185209
作者单位	Departments of Earth System Science and Chemistry, University of California, Irvine, Irvine, CA, United States
推荐引用方式 GB/T 7714	Patterson J.D.,Saltzman E.S.. Diffusivity and Solubility of H2 in Ice Ih: Implications for the Behavior of H2 in Polar Ice[J],2021,126(10).
APA	Patterson J.D.,&Saltzman E.S..(2021).Diffusivity and Solubility of H2 in Ice Ih: Implications for the Behavior of H2 in Polar Ice.Journal of Geophysical Research: Atmospheres,126(10).
MLA	Patterson J.D.,et al."Diffusivity and Solubility of H2 in Ice Ih: Implications for the Behavior of H2 in Polar Ice".Journal of Geophysical Research: Atmospheres 126.10(2021).