Pure rotational Raman spectroscopy applied to N2/O2 analysis of air bubbles in polar firn
Earlier gas measurements of firn air (atmosphere in open pore channels) at polar sites have revealed the occurrence of gas fractionation phenomena during bubble close-off, in addition to well-known thermal and gravitational gas separation. Nevertheless, because of difficulties posed by measurement,...
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Format: | Article |
Language: | English |
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Cambridge University Press
2021-10-01
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Series: | Journal of Glaciology |
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Online Access: | https://www.cambridge.org/core/product/identifier/S002214302100040X/type/journal_article |
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author | Hiroshi Ohno Yoshinori Iizuka Shuji Fujita |
author_facet | Hiroshi Ohno Yoshinori Iizuka Shuji Fujita |
author_sort | Hiroshi Ohno |
collection | DOAJ |
description | Earlier gas measurements of firn air (atmosphere in open pore channels) at polar sites have revealed the occurrence of gas fractionation phenomena during bubble close-off, in addition to well-known thermal and gravitational gas separation. Nevertheless, because of difficulties posed by measurement, little is known about the distribution of air constituents in already closed pores (bubbles) in firn. Herein, we describe the application of high-sensitivity pure rotational Raman spectroscopy, combined with sample immersion in the fluorocarbon-based inert fluid for removing the optical disturbance by diffused reflection. That application efficiently elicits information about nitrogen and oxygen composition ratios (N2/O2 or O2/N2) for each air bubble in firn. The developed methodology presents important implications for elucidating how gas records are formed and modified in the course of pore close-off in polar firn. |
first_indexed | 2024-04-10T04:39:45Z |
format | Article |
id | doaj.art-93db4de55a49455f8cc77bc0ad52ff4a |
institution | Directory Open Access Journal |
issn | 0022-1430 1727-5652 |
language | English |
last_indexed | 2024-04-10T04:39:45Z |
publishDate | 2021-10-01 |
publisher | Cambridge University Press |
record_format | Article |
series | Journal of Glaciology |
spelling | doaj.art-93db4de55a49455f8cc77bc0ad52ff4a2023-03-09T12:41:10ZengCambridge University PressJournal of Glaciology0022-14301727-56522021-10-016790390810.1017/jog.2021.40Pure rotational Raman spectroscopy applied to N2/O2 analysis of air bubbles in polar firnHiroshi Ohno0Yoshinori Iizuka1Shuji Fujita2https://orcid.org/0000-0003-0127-0777Kitami Institute of Technology, Kitami, JapanInstitute of Low Temperature Science, Hokkaido University, Sapporo, JapanNational Institute of Polar Research, Research Organization of Information and Systems (ROIS), Tokyo, Japan Department of Polar Science, School of Multidisciplinary Sciences, The Graduate University for Advanced Studies, SOKENDAI, Miura, JapanEarlier gas measurements of firn air (atmosphere in open pore channels) at polar sites have revealed the occurrence of gas fractionation phenomena during bubble close-off, in addition to well-known thermal and gravitational gas separation. Nevertheless, because of difficulties posed by measurement, little is known about the distribution of air constituents in already closed pores (bubbles) in firn. Herein, we describe the application of high-sensitivity pure rotational Raman spectroscopy, combined with sample immersion in the fluorocarbon-based inert fluid for removing the optical disturbance by diffused reflection. That application efficiently elicits information about nitrogen and oxygen composition ratios (N2/O2 or O2/N2) for each air bubble in firn. The developed methodology presents important implications for elucidating how gas records are formed and modified in the course of pore close-off in polar firn.https://www.cambridge.org/core/product/identifier/S002214302100040X/type/journal_articleAntarctic glaciologyice corepolar firn |
spellingShingle | Hiroshi Ohno Yoshinori Iizuka Shuji Fujita Pure rotational Raman spectroscopy applied to N2/O2 analysis of air bubbles in polar firn Journal of Glaciology Antarctic glaciology ice core polar firn |
title | Pure rotational Raman spectroscopy applied to N2/O2 analysis of air bubbles in polar firn |
title_full | Pure rotational Raman spectroscopy applied to N2/O2 analysis of air bubbles in polar firn |
title_fullStr | Pure rotational Raman spectroscopy applied to N2/O2 analysis of air bubbles in polar firn |
title_full_unstemmed | Pure rotational Raman spectroscopy applied to N2/O2 analysis of air bubbles in polar firn |
title_short | Pure rotational Raman spectroscopy applied to N2/O2 analysis of air bubbles in polar firn |
title_sort | pure rotational raman spectroscopy applied to n2 o2 analysis of air bubbles in polar firn |
topic | Antarctic glaciology ice core polar firn |
url | https://www.cambridge.org/core/product/identifier/S002214302100040X/type/journal_article |
work_keys_str_mv | AT hiroshiohno purerotationalramanspectroscopyappliedton2o2analysisofairbubblesinpolarfirn AT yoshinoriiizuka purerotationalramanspectroscopyappliedton2o2analysisofairbubblesinpolarfirn AT shujifujita purerotationalramanspectroscopyappliedton2o2analysisofairbubblesinpolarfirn |