 |
| Titel |
Influence of a Carrington-like event on the atmospheric chemistry, temperature and dynamics |
| VerfasserIn |
M. Calisto, P. T. Verronen, E. Rozanov, T. Peter |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 18 ; Nr. 12, no. 18 (2012-09-26), S.8679-8686 |
| Datensatznummer |
250011472
|
| Publikation (Nr.) |
 copernicus.org/acp-12-8679-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| We have modeled the atmospheric impact of a major solar energetic particle
event similar in intensity to what is thought of the Carrington Event of 1–2
September 1859. Ionization rates for the August 1972 solar proton event,
which had an energy spectrum comparable to the Carrington Event, were scaled
up in proportion to the fluence estimated for both events. We have assumed
such an event to take place in the year 2020 in order to investigate the
impact on the modern, near future atmosphere. Effects on atmospheric
chemistry, temperature and dynamics were investigated using the 3-D
Chemistry Climate Model SOCOL v2.0. We find significant responses of
NOx, HOx, ozone, temperature and zonal wind. Ozone and NOx
have in common an unusually strong and long-lived response to this solar
proton event. The model suggests a 3-fold increase of NOx generated in
the upper stratosphere lasting until the end of November, and an up to
10-fold increase in upper mesospheric HOx. Due to the NOx and
HOx enhancements, ozone reduces by up to 60–80% in the mesosphere
during the days after the event, and by up to 20–40% in the middle
stratosphere lasting for several months after the event. Total ozone is
reduced by up to 20 DU in the Northern Hemisphere and up to 10 DU in the
Southern Hemisphere. Free tropospheric and surface air temperatures show a
significant cooling of more than 3 K and zonal winds change significantly by
3–5 m s−1 in the UTLS region. In conclusion, a solar proton event, if it took
place in the near future with an intensity similar to that ascribed to of
the Carrington Event of 1859, must be expected to have a major impact on
atmospheric composition throughout the middle atmosphere, resulting in
significant and persistent decrease in total ozone. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|