Impact of January 2005 solar proton events on chlorine species
Sudden changes in stratospheric chlorine species in the polar northern atmosphere, caused by the Solar Proton Events (SPEs) of 17 and 20 January 2005, have been investigated and compared with version 4 of the Whole Atmosphere Community Climate Model (WACCM4). We used Aura Microwave Limb Sounder (MLS...
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ftncar:oai:drupal-site.org:articles_11686 2023-09-05T13:22:43+02:00 Impact of January 2005 solar proton events on chlorine species Damiani, A. (author) Funke, B. (author) Marsh, Daniel (author) Lopez-Puertas, M. (author) Santee, M. (author) Froidevaux, L. (author) Wang, S. (author) Jackman, C. (author) von Clarmann, T. (author) Gardini, A. (author) Cordero, R. (author) Storini, M. (author) 2012-05-10 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-009-048 https://doi.org/10.5194/acp-12-4159-2012 en eng Copernicus Publications Atmospheric Chemistry and Physics http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-009-048 doi:10.5194/acp-12-4159-2012 ark:/85065/d7zg6svn Copyright Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License. Text article 2012 ftncar https://doi.org/10.5194/acp-12-4159-2012 2023-08-14T18:39:35Z Sudden changes in stratospheric chlorine species in the polar northern atmosphere, caused by the Solar Proton Events (SPEs) of 17 and 20 January 2005, have been investigated and compared with version 4 of the Whole Atmosphere Community Climate Model (WACCM4). We used Aura Microwave Limb Sounder (MLS) measurements to monitor the variability of ClO, HCl, HOCl and Michelson Interferometer for Passive Atmospheric Sounder (MIPAS) on ENVISAT to retrieve ClONO₂. SPE-induced chlorine activation has been identified. HCl decrease occurred at nearly all the investigated altitudes (i.e., 10-0.5 hPa) with the strongest decrease (of about 0.25 ppbv) on 21 January. HOCl was found to be the main active chlorine species under nighttime conditions (with increases of more than 0.2 ppbv) whereas both HOCl and ClO enhancements (about 0.1 ppbv) have been observed at the polar night terminator. Further, small ClO decreases (of less than 0.1 ppbv) and ClONO₂ enhancements (about 0.2 ppbv) have been observed at higher latitudes (i.e., at nighttime) roughly above 2 hPa. While WACCM4 reproduces most of the SPE-induced variability in the chlorine species fairly well, in some particular regions discrepancies between the modeled and measured temporal evolution of the abundances of chlorine species were found. HOCl changes are modelled very well with respect to both magnitude and geographic distribution. ClO decreases are reproduced at high latitudes, whereas ClO enhancements in the terminator region are underestimated and attributed to background variations. WACCM4 also reproduces the HCl depletion in the mesosphere but it does not show the observed decrease below about 2 hPa. Finally, WACCM4 simulations indicate that the observed ClONO₂ increase is dominated by background variability, although SPE-induced production might contribute by 0.1 ppbv. Article in Journal/Newspaper polar night OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Atmospheric Chemistry and Physics 12 9 4159 4179 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
Sudden changes in stratospheric chlorine species in the polar northern atmosphere, caused by the Solar Proton Events (SPEs) of 17 and 20 January 2005, have been investigated and compared with version 4 of the Whole Atmosphere Community Climate Model (WACCM4). We used Aura Microwave Limb Sounder (MLS) measurements to monitor the variability of ClO, HCl, HOCl and Michelson Interferometer for Passive Atmospheric Sounder (MIPAS) on ENVISAT to retrieve ClONO₂. SPE-induced chlorine activation has been identified. HCl decrease occurred at nearly all the investigated altitudes (i.e., 10-0.5 hPa) with the strongest decrease (of about 0.25 ppbv) on 21 January. HOCl was found to be the main active chlorine species under nighttime conditions (with increases of more than 0.2 ppbv) whereas both HOCl and ClO enhancements (about 0.1 ppbv) have been observed at the polar night terminator. Further, small ClO decreases (of less than 0.1 ppbv) and ClONO₂ enhancements (about 0.2 ppbv) have been observed at higher latitudes (i.e., at nighttime) roughly above 2 hPa. While WACCM4 reproduces most of the SPE-induced variability in the chlorine species fairly well, in some particular regions discrepancies between the modeled and measured temporal evolution of the abundances of chlorine species were found. HOCl changes are modelled very well with respect to both magnitude and geographic distribution. ClO decreases are reproduced at high latitudes, whereas ClO enhancements in the terminator region are underestimated and attributed to background variations. WACCM4 also reproduces the HCl depletion in the mesosphere but it does not show the observed decrease below about 2 hPa. Finally, WACCM4 simulations indicate that the observed ClONO₂ increase is dominated by background variability, although SPE-induced production might contribute by 0.1 ppbv. |
author2 |
Damiani, A. (author) Funke, B. (author) Marsh, Daniel (author) Lopez-Puertas, M. (author) Santee, M. (author) Froidevaux, L. (author) Wang, S. (author) Jackman, C. (author) von Clarmann, T. (author) Gardini, A. (author) Cordero, R. (author) Storini, M. (author) |
format |
Article in Journal/Newspaper |
title |
Impact of January 2005 solar proton events on chlorine species |
spellingShingle |
Impact of January 2005 solar proton events on chlorine species |
title_short |
Impact of January 2005 solar proton events on chlorine species |
title_full |
Impact of January 2005 solar proton events on chlorine species |
title_fullStr |
Impact of January 2005 solar proton events on chlorine species |
title_full_unstemmed |
Impact of January 2005 solar proton events on chlorine species |
title_sort |
impact of january 2005 solar proton events on chlorine species |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-009-048 https://doi.org/10.5194/acp-12-4159-2012 |
genre |
polar night |
genre_facet |
polar night |
op_relation |
Atmospheric Chemistry and Physics http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-009-048 doi:10.5194/acp-12-4159-2012 ark:/85065/d7zg6svn |
op_rights |
Copyright Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License. |
op_doi |
https://doi.org/10.5194/acp-12-4159-2012 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
12 |
container_issue |
9 |
container_start_page |
4159 |
op_container_end_page |
4179 |
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1776203242889281536 |