Precipitation of salts in freezing seawater and ozone depletion events: a status report
International audience In springtime, the polar marine boundary layer exhibits drastic ozone depletion events (ODEs), associated with elevated bromine oxide (BrO) mixing ratios. The current interpretation of this peculiar chemistry requires the existence of acid and bromide-enriched surfaces to hete...
Published in: | Atmospheric Chemistry and Physics |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2008
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Online Access: | https://insu.hal.science/insu-00424474 https://insu.hal.science/insu-00424474/document https://insu.hal.science/insu-00424474/file/08-2008-morin-acp-brine-FREZCHEM.pdf https://doi.org/10.5194/acp-8-7317-2008 |
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HAL Sorbonne Université |
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ftsorbonneuniv |
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English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [CHIM.OTHE]Chemical Sciences/Other |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [CHIM.OTHE]Chemical Sciences/Other Morin, Samuel Marion, G. M. von Glasow, R. Voisin, D. Bouchez, J. Savarino, Joel Precipitation of salts in freezing seawater and ozone depletion events: a status report |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [CHIM.OTHE]Chemical Sciences/Other |
description |
International audience In springtime, the polar marine boundary layer exhibits drastic ozone depletion events (ODEs), associated with elevated bromine oxide (BrO) mixing ratios. The current interpretation of this peculiar chemistry requires the existence of acid and bromide-enriched surfaces to heterogeneously promote and sustain ODEs. Sander et al. (2006) have proposed that calcium carbonate (CaCO3) precipitation in any seawater-derived medium could potentially decrease its alkalinity, making it easier for atmospheric acids such as HNO3 and H2SO4 to acidify it. We performed simulations using the state-of-the-art FREZCHEM model, capable of handling the thermodynamics of concentrated electrolyte solutions, to try to reproduce their results, and found that when ikaite (CaCO3·6H2O) rather than calcite (CaCO3) precipitates, there is no such effect on alkalinity. Given that ikaite has recently been identified in Antarctic brines (Dieckmann et al., 2008), our results show that great caution should be exercised when using the results of Sander et al. (2006), and reveal the urgent need of laboratory investigations on the actual link(s) between bromine activation and the pH of the surfaces on which it is supposed to take place at subzero temperature. In addition, the evolution of the Cl/Br ratio in the brine during freezing was computed using FREZCHEM, taking into account Br substitutions in Cl–containing salts. |
author2 |
Laboratoire de glaciologie et géophysique de l'environnement (LGGE) 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 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)-Centre National de la Recherche Scientifique (CNRS) Desert Research Institute Department of Computer Science University of East Anglia Norwich (UEA) Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Morin, Samuel Marion, G. M. von Glasow, R. Voisin, D. Bouchez, J. Savarino, Joel |
author_facet |
Morin, Samuel Marion, G. M. von Glasow, R. Voisin, D. Bouchez, J. Savarino, Joel |
author_sort |
Morin, Samuel |
title |
Precipitation of salts in freezing seawater and ozone depletion events: a status report |
title_short |
Precipitation of salts in freezing seawater and ozone depletion events: a status report |
title_full |
Precipitation of salts in freezing seawater and ozone depletion events: a status report |
title_fullStr |
Precipitation of salts in freezing seawater and ozone depletion events: a status report |
title_full_unstemmed |
Precipitation of salts in freezing seawater and ozone depletion events: a status report |
title_sort |
precipitation of salts in freezing seawater and ozone depletion events: a status report |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://insu.hal.science/insu-00424474 https://insu.hal.science/insu-00424474/document https://insu.hal.science/insu-00424474/file/08-2008-morin-acp-brine-FREZCHEM.pdf https://doi.org/10.5194/acp-8-7317-2008 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://insu.hal.science/insu-00424474 Atmospheric Chemistry and Physics, 2008, 8, pp.7317 - 7324. ⟨10.5194/acp-8-7317-2008⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-8-7317-2008 insu-00424474 https://insu.hal.science/insu-00424474 https://insu.hal.science/insu-00424474/document https://insu.hal.science/insu-00424474/file/08-2008-morin-acp-brine-FREZCHEM.pdf doi:10.5194/acp-8-7317-2008 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/acp-8-7317-2008 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
8 |
container_issue |
23 |
container_start_page |
7317 |
op_container_end_page |
7324 |
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1810490437539987456 |
spelling |
ftsorbonneuniv:oai:HAL:insu-00424474v1 2024-09-15T17:43:27+00:00 Precipitation of salts in freezing seawater and ozone depletion events: a status report Morin, Samuel Marion, G. M. von Glasow, R. Voisin, D. Bouchez, J. Savarino, Joel Laboratoire de glaciologie et géophysique de l'environnement (LGGE) 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 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)-Centre National de la Recherche Scientifique (CNRS) Desert Research Institute Department of Computer Science University of East Anglia Norwich (UEA) Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) 2008-12-11 https://insu.hal.science/insu-00424474 https://insu.hal.science/insu-00424474/document https://insu.hal.science/insu-00424474/file/08-2008-morin-acp-brine-FREZCHEM.pdf https://doi.org/10.5194/acp-8-7317-2008 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-8-7317-2008 insu-00424474 https://insu.hal.science/insu-00424474 https://insu.hal.science/insu-00424474/document https://insu.hal.science/insu-00424474/file/08-2008-morin-acp-brine-FREZCHEM.pdf doi:10.5194/acp-8-7317-2008 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://insu.hal.science/insu-00424474 Atmospheric Chemistry and Physics, 2008, 8, pp.7317 - 7324. ⟨10.5194/acp-8-7317-2008⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [CHIM.OTHE]Chemical Sciences/Other info:eu-repo/semantics/article Journal articles 2008 ftsorbonneuniv https://doi.org/10.5194/acp-8-7317-2008 2024-07-25T23:47:39Z International audience In springtime, the polar marine boundary layer exhibits drastic ozone depletion events (ODEs), associated with elevated bromine oxide (BrO) mixing ratios. The current interpretation of this peculiar chemistry requires the existence of acid and bromide-enriched surfaces to heterogeneously promote and sustain ODEs. Sander et al. (2006) have proposed that calcium carbonate (CaCO3) precipitation in any seawater-derived medium could potentially decrease its alkalinity, making it easier for atmospheric acids such as HNO3 and H2SO4 to acidify it. We performed simulations using the state-of-the-art FREZCHEM model, capable of handling the thermodynamics of concentrated electrolyte solutions, to try to reproduce their results, and found that when ikaite (CaCO3·6H2O) rather than calcite (CaCO3) precipitates, there is no such effect on alkalinity. Given that ikaite has recently been identified in Antarctic brines (Dieckmann et al., 2008), our results show that great caution should be exercised when using the results of Sander et al. (2006), and reveal the urgent need of laboratory investigations on the actual link(s) between bromine activation and the pH of the surfaces on which it is supposed to take place at subzero temperature. In addition, the evolution of the Cl/Br ratio in the brine during freezing was computed using FREZCHEM, taking into account Br substitutions in Cl–containing salts. Article in Journal/Newspaper Antarc* Antarctic HAL Sorbonne Université Atmospheric Chemistry and Physics 8 23 7317 7324 |