Tropospheric impacts of volcanic halogen emissions: first simulations of reactive halogen chemistry in the Eyjafjallajökull eruption plume
International audience Volcanic plumes are regions of high chemical reactivity. Instrumented research aircraft that probed the 2010 Icelandic Eyjafjallajökull eruption plume identified in-plume ozone depletion and reactive halogens (Cl, BrO), the latter also detected by satellite. These measurements...
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ftobservparis:oai:HAL:insu-01552643v1 2024-05-19T07:39:57+00:00 Tropospheric impacts of volcanic halogen emissions: first simulations of reactive halogen chemistry in the Eyjafjallajökull eruption plume Roberts, Tjarda J. Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E) Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales Paris (CNES) Vienne, Austria 2013-04-07 https://insu.hal.science/insu-01552643 en eng HAL CCSD insu-01552643 https://insu.hal.science/insu-01552643 European Geosciences Union General Assembly 2013 https://insu.hal.science/insu-01552643 European Geosciences Union General Assembly 2013, Apr 2013, Vienne, Austria. pp.2013 - 10145 [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/conferenceObject Conference papers 2013 ftobservparis 2024-04-25T01:39:18Z International audience Volcanic plumes are regions of high chemical reactivity. Instrumented research aircraft that probed the 2010 Icelandic Eyjafjallajökull eruption plume identified in-plume ozone depletion and reactive halogens (Cl, BrO), the latter also detected by satellite. These measurements add to growing evidence that volcanic plumes support rapid reactive halogen chemistry, with predicted impacts including depletion of atmospheric oxidants and mercury deposition. However, attempts to simulate volcanic plume halogen chemistry and predict impacts are subject to considerable uncertainties. e.g. in rate constants for HOBr reactive uptake (see this session: EGU2013-6076), or in the high-temperature initialisation. Model studies attempting to replicate volcanic plume halogen chemistry are restricted by a paucity of field data that is required both for model tuning and verification, hence reported model 'solutions' are not necessarily unique. To this end, the aircraft, ground-based and satellite studies of the Eyjafjallajökull eruption provide a valuable combination of datasets for improving our understanding of plume chemistry and impacts. Here, PlumeChem simulations of Eyjafjallajökull plume reactive halogen chemistry and impacts are presented and verified by observations for the first time. Observed ozone loss, a function of plume strength and age, is quantitatively reproduced by the model. Magnitudinal agreement to reported downwind BrO and Cl is also shown. The model predicts multi-day impacts, with reactive bromine mainly as BrO, HOBr and BrONO 2 during daytime, and Br2 and BrCl at night. BrO/SO 2 is reduced in more dispersed plumes due to enhanced partitioning to HOBr, of potential interest to satellite studies of BrO downwind of volcanoes. Additional predicted impacts of Eyjafjallajökull volcanic plume halogen chemistry include BrO-mediated depletion of HO x that reduces the rate of SO 2 oxidation to H2SO4, hence the formation of sulphate aerosol. The model predicts NO x is rapidly converted into ... Conference Object Eyjafjallajökull Archive de l'Observatoire de Paris (HAL) |
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Open Polar |
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Archive de l'Observatoire de Paris (HAL) |
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ftobservparis |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
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[SDU]Sciences of the Universe [physics] Roberts, Tjarda J. Tropospheric impacts of volcanic halogen emissions: first simulations of reactive halogen chemistry in the Eyjafjallajökull eruption plume |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience Volcanic plumes are regions of high chemical reactivity. Instrumented research aircraft that probed the 2010 Icelandic Eyjafjallajökull eruption plume identified in-plume ozone depletion and reactive halogens (Cl, BrO), the latter also detected by satellite. These measurements add to growing evidence that volcanic plumes support rapid reactive halogen chemistry, with predicted impacts including depletion of atmospheric oxidants and mercury deposition. However, attempts to simulate volcanic plume halogen chemistry and predict impacts are subject to considerable uncertainties. e.g. in rate constants for HOBr reactive uptake (see this session: EGU2013-6076), or in the high-temperature initialisation. Model studies attempting to replicate volcanic plume halogen chemistry are restricted by a paucity of field data that is required both for model tuning and verification, hence reported model 'solutions' are not necessarily unique. To this end, the aircraft, ground-based and satellite studies of the Eyjafjallajökull eruption provide a valuable combination of datasets for improving our understanding of plume chemistry and impacts. Here, PlumeChem simulations of Eyjafjallajökull plume reactive halogen chemistry and impacts are presented and verified by observations for the first time. Observed ozone loss, a function of plume strength and age, is quantitatively reproduced by the model. Magnitudinal agreement to reported downwind BrO and Cl is also shown. The model predicts multi-day impacts, with reactive bromine mainly as BrO, HOBr and BrONO 2 during daytime, and Br2 and BrCl at night. BrO/SO 2 is reduced in more dispersed plumes due to enhanced partitioning to HOBr, of potential interest to satellite studies of BrO downwind of volcanoes. Additional predicted impacts of Eyjafjallajökull volcanic plume halogen chemistry include BrO-mediated depletion of HO x that reduces the rate of SO 2 oxidation to H2SO4, hence the formation of sulphate aerosol. The model predicts NO x is rapidly converted into ... |
author2 |
Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E) Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales Paris (CNES) |
format |
Conference Object |
author |
Roberts, Tjarda J. |
author_facet |
Roberts, Tjarda J. |
author_sort |
Roberts, Tjarda J. |
title |
Tropospheric impacts of volcanic halogen emissions: first simulations of reactive halogen chemistry in the Eyjafjallajökull eruption plume |
title_short |
Tropospheric impacts of volcanic halogen emissions: first simulations of reactive halogen chemistry in the Eyjafjallajökull eruption plume |
title_full |
Tropospheric impacts of volcanic halogen emissions: first simulations of reactive halogen chemistry in the Eyjafjallajökull eruption plume |
title_fullStr |
Tropospheric impacts of volcanic halogen emissions: first simulations of reactive halogen chemistry in the Eyjafjallajökull eruption plume |
title_full_unstemmed |
Tropospheric impacts of volcanic halogen emissions: first simulations of reactive halogen chemistry in the Eyjafjallajökull eruption plume |
title_sort |
tropospheric impacts of volcanic halogen emissions: first simulations of reactive halogen chemistry in the eyjafjallajökull eruption plume |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://insu.hal.science/insu-01552643 |
op_coverage |
Vienne, Austria |
genre |
Eyjafjallajökull |
genre_facet |
Eyjafjallajökull |
op_source |
European Geosciences Union General Assembly 2013 https://insu.hal.science/insu-01552643 European Geosciences Union General Assembly 2013, Apr 2013, Vienne, Austria. pp.2013 - 10145 |
op_relation |
insu-01552643 https://insu.hal.science/insu-01552643 |
_version_ |
1799479535476932608 |