High precision isotopic study of atmospheric helium : volcanic and environmental applications
The helium isotopic composition of air (RA = 3He/4He = 1.39 × 10-6) is related to the natural and anthropogenic fluxes of 3He and 4He from the Earth (and from space for 3He). Industrial activities emit gases enriched in radiogenic 4He (exploitation of fossil fuels) and in 3He (nuclear activities). I...
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ftinsu:oai:HAL:tel-01906014v1 2023-10-09T21:46:26+02:00 High precision isotopic study of atmospheric helium : volcanic and environmental applications Étude isotopique de l'hélium atmosphérique à haute précision : applications environnementales et volcaniques Boucher, Christine Centre de Recherches Pétrographiques et Géochimiques (CRPG) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) Université de Lorraine Bernard Marty 2017-09-15 https://hal.univ-lorraine.fr/tel-01906014 https://hal.univ-lorraine.fr/tel-01906014/document https://hal.univ-lorraine.fr/tel-01906014/file/DDOC_T_2017_0194_BOUCHER.pdf fr fre HAL CCSD NNT: 2017LORR0194 tel-01906014 https://hal.univ-lorraine.fr/tel-01906014 https://hal.univ-lorraine.fr/tel-01906014/document https://hal.univ-lorraine.fr/tel-01906014/file/DDOC_T_2017_0194_BOUCHER.pdf info:eu-repo/semantics/OpenAccess https://hal.univ-lorraine.fr/tel-01906014 Géochimie. Université de Lorraine, 2017. Français. ⟨NNT : 2017LORR0194⟩ Helium Isotopes Noble gases Atmosphere Gaz nobles [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/doctoralThesis Theses 2017 ftinsu 2023-09-13T16:32:04Z The helium isotopic composition of air (RA = 3He/4He = 1.39 × 10-6) is related to the natural and anthropogenic fluxes of 3He and 4He from the Earth (and from space for 3He). Industrial activities emit gases enriched in radiogenic 4He (exploitation of fossil fuels) and in 3He (nuclear activities). It has been proposed that the 3He/4He ratio in air has varied over time and also spatially because of these helium fluxes. Such variations could allow the use of this ratio as a new tracer of anthropogenic and/or natural pollutants. To verify these possibilities, we undertook high-precision measurements of the composition of atmospheric helium (2-6‰, 2σ) at the Centre de Recherches Pétrographiques et Géochimiques (University of Lorraine, Centre National de Recherche Scientique, Vandoeuvre-lès-Nancy, France). We performed sample-standard bracketing analyses with a double collector Helix SFT Mass Spectrometer. During each of these analyses, several individual analyses of an air sample are conducted in alternation with an air standard. We found no evidence of temporal variation of the 3He/4He ratio in French air trapped in petanque balls (1965, 1990, 2010, 2013), metallic tanks (2010, 2016) and in a carburettor (1910). Including the measurements of Mabry et al. (2015) for the Cape Grim air archive (Tasmania, Australia), we obtained a trend of -0.05 ± 2.46‰ over 106 years. At the global level, we only detected two air samples out of sixteen (Dôme C-Antarctica, Tokyo-Japan) whose compositions are statistically distinct, marked by 3He excesses of 2.0 ± 1.4‰, and 1.7 ± 1.5‰, respectively (95% confidence interval). These excesses could be related to local and regional helium fluxes input such as: (i) auroral precipitation in Antarctica; (ii) volcanoes and/or nuclear releases (Fukushima Daï-Ichi) in Japan. In the Afar region (Ethiopia), we detected 3He excesses of ~1% above the lava lake of the Erta Ale volcano, which can be used to trace reactive gases (e.g. CO2) released simultaneously. These excesses are quickly affected by ... Doctoral or Postdoctoral Thesis Antarc* Antarctica Institut national des sciences de l'Univers: HAL-INSU Erta ENVELOPE(27.142,27.142,-71.670,-71.670) Fukushima Grim ENVELOPE(-64.486,-64.486,-65.379,-65.379) Lava Lake ENVELOPE(-128.996,-128.996,55.046,55.046) |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
French |
topic |
Helium Isotopes Noble gases Atmosphere Gaz nobles [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
Helium Isotopes Noble gases Atmosphere Gaz nobles [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Boucher, Christine High precision isotopic study of atmospheric helium : volcanic and environmental applications |
topic_facet |
Helium Isotopes Noble gases Atmosphere Gaz nobles [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
The helium isotopic composition of air (RA = 3He/4He = 1.39 × 10-6) is related to the natural and anthropogenic fluxes of 3He and 4He from the Earth (and from space for 3He). Industrial activities emit gases enriched in radiogenic 4He (exploitation of fossil fuels) and in 3He (nuclear activities). It has been proposed that the 3He/4He ratio in air has varied over time and also spatially because of these helium fluxes. Such variations could allow the use of this ratio as a new tracer of anthropogenic and/or natural pollutants. To verify these possibilities, we undertook high-precision measurements of the composition of atmospheric helium (2-6‰, 2σ) at the Centre de Recherches Pétrographiques et Géochimiques (University of Lorraine, Centre National de Recherche Scientique, Vandoeuvre-lès-Nancy, France). We performed sample-standard bracketing analyses with a double collector Helix SFT Mass Spectrometer. During each of these analyses, several individual analyses of an air sample are conducted in alternation with an air standard. We found no evidence of temporal variation of the 3He/4He ratio in French air trapped in petanque balls (1965, 1990, 2010, 2013), metallic tanks (2010, 2016) and in a carburettor (1910). Including the measurements of Mabry et al. (2015) for the Cape Grim air archive (Tasmania, Australia), we obtained a trend of -0.05 ± 2.46‰ over 106 years. At the global level, we only detected two air samples out of sixteen (Dôme C-Antarctica, Tokyo-Japan) whose compositions are statistically distinct, marked by 3He excesses of 2.0 ± 1.4‰, and 1.7 ± 1.5‰, respectively (95% confidence interval). These excesses could be related to local and regional helium fluxes input such as: (i) auroral precipitation in Antarctica; (ii) volcanoes and/or nuclear releases (Fukushima Daï-Ichi) in Japan. In the Afar region (Ethiopia), we detected 3He excesses of ~1% above the lava lake of the Erta Ale volcano, which can be used to trace reactive gases (e.g. CO2) released simultaneously. These excesses are quickly affected by ... |
author2 |
Centre de Recherches Pétrographiques et Géochimiques (CRPG) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) Université de Lorraine Bernard Marty |
format |
Doctoral or Postdoctoral Thesis |
author |
Boucher, Christine |
author_facet |
Boucher, Christine |
author_sort |
Boucher, Christine |
title |
High precision isotopic study of atmospheric helium : volcanic and environmental applications |
title_short |
High precision isotopic study of atmospheric helium : volcanic and environmental applications |
title_full |
High precision isotopic study of atmospheric helium : volcanic and environmental applications |
title_fullStr |
High precision isotopic study of atmospheric helium : volcanic and environmental applications |
title_full_unstemmed |
High precision isotopic study of atmospheric helium : volcanic and environmental applications |
title_sort |
high precision isotopic study of atmospheric helium : volcanic and environmental applications |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.univ-lorraine.fr/tel-01906014 https://hal.univ-lorraine.fr/tel-01906014/document https://hal.univ-lorraine.fr/tel-01906014/file/DDOC_T_2017_0194_BOUCHER.pdf |
long_lat |
ENVELOPE(27.142,27.142,-71.670,-71.670) ENVELOPE(-64.486,-64.486,-65.379,-65.379) ENVELOPE(-128.996,-128.996,55.046,55.046) |
geographic |
Erta Fukushima Grim Lava Lake |
geographic_facet |
Erta Fukushima Grim Lava Lake |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
https://hal.univ-lorraine.fr/tel-01906014 Géochimie. Université de Lorraine, 2017. Français. ⟨NNT : 2017LORR0194⟩ |
op_relation |
NNT: 2017LORR0194 tel-01906014 https://hal.univ-lorraine.fr/tel-01906014 https://hal.univ-lorraine.fr/tel-01906014/document https://hal.univ-lorraine.fr/tel-01906014/file/DDOC_T_2017_0194_BOUCHER.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1779322125120700416 |