Analysis and parameterisation of ionic reactions affecting middle atmospheric HOx and NOy during solar proton events
In the polar regions, precipitation of solar high-energy protons and electrons affects the neutral composition of the middle atmosphere. Here we use the Sodankylä Ion and Neutral Chemistry model to calculate ionic production and loss rates of neutral HOx and NOy species, imposed by particle precipit...
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ftawi:oai:epic.awi.de:33052 2023-05-15T18:20:17+02:00 Analysis and parameterisation of ionic reactions affecting middle atmospheric HOx and NOy during solar proton events Verronen, P. T. Lehmann, Ralph 2013 application/pdf https://epic.awi.de/id/eprint/33052/ https://epic.awi.de/id/eprint/33052/1/Verronen_Lehmann_2013.pdf https://hdl.handle.net/10013/epic.41601 https://hdl.handle.net/10013/epic.41601.d001 unknown https://epic.awi.de/id/eprint/33052/1/Verronen_Lehmann_2013.pdf https://hdl.handle.net/10013/epic.41601.d001 Verronen, P. T. and Lehmann, R. (2013) Analysis and parameterisation of ionic reactions affecting middle atmospheric HOx and NOy during solar proton events , Annales Geophysicae, 31 , pp. 909-956 . doi:10.5194/angeo-31-909-2013 <https://doi.org/10.5194/angeo-31-909-2013> , hdl:10013/epic.41601 EPIC3Annales Geophysicae, 31, pp. 909-956, ISSN: 0992-7689 Article isiRev 2013 ftawi https://doi.org/10.5194/angeo-31-909-2013 2021-12-24T15:38:39Z In the polar regions, precipitation of solar high-energy protons and electrons affects the neutral composition of the middle atmosphere. Here we use the Sodankylä Ion and Neutral Chemistry model to calculate ionic production and loss rates of neutral HOx and NOy species, imposed by particle precipitation, for a range of atmospheric conditions and levels of ionization. We also analyse in detail the ionic reaction sequences leading to the HOx and NOy changes. Our results show that particle impact ionization and positive ion chemistry cause net production of N, NO, HNO2, H, andOH from N2 and H2O. On the other hand, negative ion chemistry redistributes the NOy species, without net production or loss, so that NO, NO2, and N2O5 are converted to HNO3 and NO3. Based on the model results, we provide tables of so-called P/Q numbers (i.e. production and loss rates of neutral species divided by ionization rates) at altitudes between 20 and 90 km. These numbers can be easily used to parameterise the ion chemistry effects when modelling atmospheric response to particle precipitation. Compared to earlier studies, our work is the first to consider in detail the NOy effect of negative ion chemistry, and the diurnal and seasonal variability of the P/Q numbers. Article in Journal/Newspaper Sodankylä Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) Annales Geophysicae 31 5 909 956 |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
In the polar regions, precipitation of solar high-energy protons and electrons affects the neutral composition of the middle atmosphere. Here we use the Sodankylä Ion and Neutral Chemistry model to calculate ionic production and loss rates of neutral HOx and NOy species, imposed by particle precipitation, for a range of atmospheric conditions and levels of ionization. We also analyse in detail the ionic reaction sequences leading to the HOx and NOy changes. Our results show that particle impact ionization and positive ion chemistry cause net production of N, NO, HNO2, H, andOH from N2 and H2O. On the other hand, negative ion chemistry redistributes the NOy species, without net production or loss, so that NO, NO2, and N2O5 are converted to HNO3 and NO3. Based on the model results, we provide tables of so-called P/Q numbers (i.e. production and loss rates of neutral species divided by ionization rates) at altitudes between 20 and 90 km. These numbers can be easily used to parameterise the ion chemistry effects when modelling atmospheric response to particle precipitation. Compared to earlier studies, our work is the first to consider in detail the NOy effect of negative ion chemistry, and the diurnal and seasonal variability of the P/Q numbers. |
format |
Article in Journal/Newspaper |
author |
Verronen, P. T. Lehmann, Ralph |
spellingShingle |
Verronen, P. T. Lehmann, Ralph Analysis and parameterisation of ionic reactions affecting middle atmospheric HOx and NOy during solar proton events |
author_facet |
Verronen, P. T. Lehmann, Ralph |
author_sort |
Verronen, P. T. |
title |
Analysis and parameterisation of ionic reactions affecting middle atmospheric HOx and NOy during solar proton events |
title_short |
Analysis and parameterisation of ionic reactions affecting middle atmospheric HOx and NOy during solar proton events |
title_full |
Analysis and parameterisation of ionic reactions affecting middle atmospheric HOx and NOy during solar proton events |
title_fullStr |
Analysis and parameterisation of ionic reactions affecting middle atmospheric HOx and NOy during solar proton events |
title_full_unstemmed |
Analysis and parameterisation of ionic reactions affecting middle atmospheric HOx and NOy during solar proton events |
title_sort |
analysis and parameterisation of ionic reactions affecting middle atmospheric hox and noy during solar proton events |
publishDate |
2013 |
url |
https://epic.awi.de/id/eprint/33052/ https://epic.awi.de/id/eprint/33052/1/Verronen_Lehmann_2013.pdf https://hdl.handle.net/10013/epic.41601 https://hdl.handle.net/10013/epic.41601.d001 |
long_lat |
ENVELOPE(26.600,26.600,67.417,67.417) |
geographic |
Sodankylä |
geographic_facet |
Sodankylä |
genre |
Sodankylä |
genre_facet |
Sodankylä |
op_source |
EPIC3Annales Geophysicae, 31, pp. 909-956, ISSN: 0992-7689 |
op_relation |
https://epic.awi.de/id/eprint/33052/1/Verronen_Lehmann_2013.pdf https://hdl.handle.net/10013/epic.41601.d001 Verronen, P. T. and Lehmann, R. (2013) Analysis and parameterisation of ionic reactions affecting middle atmospheric HOx and NOy during solar proton events , Annales Geophysicae, 31 , pp. 909-956 . doi:10.5194/angeo-31-909-2013 <https://doi.org/10.5194/angeo-31-909-2013> , hdl:10013/epic.41601 |
op_doi |
https://doi.org/10.5194/angeo-31-909-2013 |
container_title |
Annales Geophysicae |
container_volume |
31 |
container_issue |
5 |
container_start_page |
909 |
op_container_end_page |
956 |
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1766197791446532096 |