Study of formaldehyde in coastal Antarctica.
With the aim to investigate the production and destruction mechanisms of formaldehyde (HCHO) on a seasonal scale in the remote troposphere, HCHO was monitored over a 13-months period at Dumont d'Urville station, located near the East Coast of the Antarctic continent. Monthly means of 50 ppt in...
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Other Authors: | , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
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HAL CCSD
2011
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Online Access: | https://tel.archives-ouvertes.fr/tel-00677015 https://tel.archives-ouvertes.fr/tel-00677015/document https://tel.archives-ouvertes.fr/tel-00677015/file/22876_PEPY_2011_archivage.pdf |
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ftccsdartic:oai:HAL:tel-00677015v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
French |
topic |
Formaldehyde Coastal Antarctica Oxidants Formaldéhyde Zone côtière Antarctique Oxydants [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Formaldehyde Coastal Antarctica Oxidants Formaldéhyde Zone côtière Antarctique Oxydants [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Pépy, Guillaume Study of formaldehyde in coastal Antarctica. |
topic_facet |
Formaldehyde Coastal Antarctica Oxidants Formaldéhyde Zone côtière Antarctique Oxydants [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
With the aim to investigate the production and destruction mechanisms of formaldehyde (HCHO) on a seasonal scale in the remote troposphere, HCHO was monitored over a 13-months period at Dumont d'Urville station, located near the East Coast of the Antarctic continent. Monthly means of 50 ppt in winter and up to 200 ppt in summer were measured. In spring, summer and autumn, a daily variation was detected with amplitude of ≈40 ppt and a maximum during the afternoon. The analytical instrument (Aerolaser, AL4021) deployed for the measurements, was found to be extremely sensitive to ambient temperature variations. The origin of the temperature dependence was investigated, and the deployed analytical method was adapted to eliminate this artefact. The impact of local contamination sources at the measurement site was explored in detail. Anthropogenic combustions were found to have a limited impact (maximum 150 pptv on hourly means) versus a local emission source from ornithogenic soils, induced by the omni-presence of Adelie penguins on the site in summer (maximum 200 pptv on hourly means). From november to march, these sources can introduce an overestimation by a factor 5 of the daily HCHO amplitude, while the influence on the monthly averaged budget can account up to 100 ppt. The raw dataset was thoroughly filtered using local meteorological criteria to eliminate any potential contamination. HCHO measurements were compared to simulations made with a numerical box model developed on the base of the current understanding of the photochemical sources and sinks of HCHO. During summer, methane oxidation was found to be the major source of HCHO production, likely due to enhanced levels of oxidants such as hydroxyl radical (OH) or nitrogen oxide (NO) occurring at DDU since this coastal site is under strong continental influence. Snow emissions and HCHO formation via methyl-hydroperoxyde oxidation complete the summer budget (respectively 10 to 20% of the CH4 oxidation). In contrary to what was observed for the Weddell Sea ... |
author2 |
Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Université de Grenoble Michel Legrand Susanne Preunkert |
format |
Doctoral or Postdoctoral Thesis |
author |
Pépy, Guillaume |
author_facet |
Pépy, Guillaume |
author_sort |
Pépy, Guillaume |
title |
Study of formaldehyde in coastal Antarctica. |
title_short |
Study of formaldehyde in coastal Antarctica. |
title_full |
Study of formaldehyde in coastal Antarctica. |
title_fullStr |
Study of formaldehyde in coastal Antarctica. |
title_full_unstemmed |
Study of formaldehyde in coastal Antarctica. |
title_sort |
study of formaldehyde in coastal antarctica. |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://tel.archives-ouvertes.fr/tel-00677015 https://tel.archives-ouvertes.fr/tel-00677015/document https://tel.archives-ouvertes.fr/tel-00677015/file/22876_PEPY_2011_archivage.pdf |
long_lat |
ENVELOPE(140.017,140.017,-66.667,-66.667) ENVELOPE(140.000,140.000,-66.667,-66.667) ENVELOPE(140.013,140.013,-66.667,-66.667) ENVELOPE(144.232,144.232,59.863,59.863) |
geographic |
Antarctic Dumont d'Urville Dumont d'Urville Station Dumont-d'Urville Omni The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Dumont d'Urville Dumont d'Urville Station Dumont-d'Urville Omni The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctica Antarctique* Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Antarctique* Weddell Sea |
op_source |
https://tel.archives-ouvertes.fr/tel-00677015 Sciences de la Terre. Université de Grenoble, 2011. Français. ⟨NNT : 2011GRENU045⟩ |
op_relation |
NNT: 2011GRENU045 tel-00677015 https://tel.archives-ouvertes.fr/tel-00677015 https://tel.archives-ouvertes.fr/tel-00677015/document https://tel.archives-ouvertes.fr/tel-00677015/file/22876_PEPY_2011_archivage.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766055891908427776 |
spelling |
ftccsdartic:oai:HAL:tel-00677015v1 2023-05-15T13:34:41+02:00 Study of formaldehyde in coastal Antarctica. Etude du formaldéhyde (HCHO) en zone côtière Antarctique Pépy, Guillaume Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Université de Grenoble Michel Legrand Susanne Preunkert 2011-11-23 https://tel.archives-ouvertes.fr/tel-00677015 https://tel.archives-ouvertes.fr/tel-00677015/document https://tel.archives-ouvertes.fr/tel-00677015/file/22876_PEPY_2011_archivage.pdf fr fre HAL CCSD NNT: 2011GRENU045 tel-00677015 https://tel.archives-ouvertes.fr/tel-00677015 https://tel.archives-ouvertes.fr/tel-00677015/document https://tel.archives-ouvertes.fr/tel-00677015/file/22876_PEPY_2011_archivage.pdf info:eu-repo/semantics/OpenAccess https://tel.archives-ouvertes.fr/tel-00677015 Sciences de la Terre. Université de Grenoble, 2011. Français. ⟨NNT : 2011GRENU045⟩ Formaldehyde Coastal Antarctica Oxidants Formaldéhyde Zone côtière Antarctique Oxydants [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/doctoralThesis Theses 2011 ftccsdartic 2021-10-24T16:44:09Z With the aim to investigate the production and destruction mechanisms of formaldehyde (HCHO) on a seasonal scale in the remote troposphere, HCHO was monitored over a 13-months period at Dumont d'Urville station, located near the East Coast of the Antarctic continent. Monthly means of 50 ppt in winter and up to 200 ppt in summer were measured. In spring, summer and autumn, a daily variation was detected with amplitude of ≈40 ppt and a maximum during the afternoon. The analytical instrument (Aerolaser, AL4021) deployed for the measurements, was found to be extremely sensitive to ambient temperature variations. The origin of the temperature dependence was investigated, and the deployed analytical method was adapted to eliminate this artefact. The impact of local contamination sources at the measurement site was explored in detail. Anthropogenic combustions were found to have a limited impact (maximum 150 pptv on hourly means) versus a local emission source from ornithogenic soils, induced by the omni-presence of Adelie penguins on the site in summer (maximum 200 pptv on hourly means). From november to march, these sources can introduce an overestimation by a factor 5 of the daily HCHO amplitude, while the influence on the monthly averaged budget can account up to 100 ppt. The raw dataset was thoroughly filtered using local meteorological criteria to eliminate any potential contamination. HCHO measurements were compared to simulations made with a numerical box model developed on the base of the current understanding of the photochemical sources and sinks of HCHO. During summer, methane oxidation was found to be the major source of HCHO production, likely due to enhanced levels of oxidants such as hydroxyl radical (OH) or nitrogen oxide (NO) occurring at DDU since this coastal site is under strong continental influence. Snow emissions and HCHO formation via methyl-hydroperoxyde oxidation complete the summer budget (respectively 10 to 20% of the CH4 oxidation). In contrary to what was observed for the Weddell Sea ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctica Antarctique* Weddell Sea Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Dumont d'Urville ENVELOPE(140.017,140.017,-66.667,-66.667) Dumont d'Urville Station ENVELOPE(140.000,140.000,-66.667,-66.667) Dumont-d'Urville ENVELOPE(140.013,140.013,-66.667,-66.667) Omni ENVELOPE(144.232,144.232,59.863,59.863) The Antarctic Weddell Weddell Sea |