 |
| Titel |
Chemistry of sprite discharges through ion-neutral reactions |
| VerfasserIn |
Y. Hiraki, Y. Kasai, H. Fukunishi |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 14 ; Nr. 8, no. 14 (2008-07-23), S.3919-3928 |
| Datensatznummer |
250006294
|
| Publikation (Nr.) |
 copernicus.org/acp-8-3919-2008.pdf |
|
|
|
|
|
| Zusammenfassung |
| We estimate the concentration changes, caused by
streamer
discharge in sprites, of ozone and related minor species as odd
nitrogen (NOx) and hydrogen (HOx) families in the upper stratosphere and
mesosphere. The streamer has an intense electric field and high electron
density at its head, where a large number of chemically-radical ions and atoms
are produced through electron impact on neutral molecules. After its
propagation, densities of minor species can be perturbed through ion-neutral
chemical reactions initiated by the relaxation of these radical products. We
evaluate the production rates of ions and atoms using an electron kinetics model
and by assuming that the electric field and electron density are in the head region. We
calculate the density variations mainly for NOx, Ox, and HOx species using
a one-dimensional model of the neutral and ion composition of the middle
atmosphere, including the effect of the sprite streamer. Results at the
nighttime condition show that the densities of NO, O3, H, and OH increase
suddenly through reactions triggered by the first atomic nitrogen and
oxygen product, and electrons just after streamer initiation. It is shown that NO and
NO2 still remain for 1 h by a certain order of increase with their
source-sink balance, predominantly around 60 km; for other species, increases
in O3, OH, HO2, and H2O2 still remain in the range of 40–70 km.
From this affirmative result of long-time behavior previously not presented,
we emphasize that sprites would have the power to impact local chemistry at
night. We also discuss the consistency with previous theoretical and
observational studies, along with future suggestions. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|