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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Main Authors: Hiroshi Ohno, Yoshinori Iizuka, Shuji Fujita
Format: Article
Language:English
Published: Cambridge University Press 2021-10-01
Series:Journal of Glaciology
Subjects:
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.
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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
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AT yoshinoriiizuka purerotationalramanspectroscopyappliedton2o2analysisofairbubblesinpolarfirn
AT shujifujita purerotationalramanspectroscopyappliedton2o2analysisofairbubblesinpolarfirn