Parameterisation of the chemical effects of sprites in the middle atmosphere

Publication: Research - peer-reviewJournal article – Annual report year: 2008

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Transient luminous events, such as red sprites, occur in the middle atmosphere in the electric field above thunderstorms. We here address the question whether these processes may be a significant source of odd nitrogen and affect ozone or other important trace species. A well-established coupled ion-neutral chemical model has been extended for this purpose and applied together with estimated rates of ionisation, excitation and dissociation based on spectroscopic ratios from ISUAL on FORMOSAT-2. This approach is used to estimate the NOx and ozone changes for two type cases. The NOx enhancements are at most one order of magnitude in the streamers, which means a production of at most 10 mol per event, or ( given a global rate of occurrence of three events per minute) some 150-1500 kg per day. The present study therefore indicates that sprites are insignificant as a global source of NOx. Local effects on ozone are also negligible, but the local enhancement of NOx may be significant, up to 5 times the minimum background at 70 km in extraordinary cases.
Original languageEnglish
JournalAnnales Geophysicae
Publication date2008
Volume26
Issue1
Pages13-27
ISSN0992-7689
DOIs
StatePublished

Bibliographical note

The article and any associated published material is distributed under the Creative Commons Attribution 3.0.

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Keywords

  • meteorology and atmospheric dynamics, lightning, atmospheric composition and structure, composition and chemistry, atmospheric electricity, middle atmosphere
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