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Heppa III Intercomparison Experiment on Electron Precipitation Impacts: 2. Model‐Measurement Intercomparison of Nitric Oxide (NO) During a Geomagnetic Storm in April 2010

Sinnhuber, M. ORCID iD icon; Nesse Tyssøy, H.; Asikainen, T.; Bender, S.; Funke, B.; Hendrickx, K.; Pettit, J. M.; Reddmann, T.; Rozanov, E.; Schmidt, H.; Smith-Johnsen, C.; Sukhodolov, T.; Szeląg, M. E.; Kamp, M.; Verronen, P. T.; Wissing, J. M.; Yakovchuk, O. S.


Precipitating auroral and radiation belt electrons are considered to play an important part in the natural forcing of the middle atmosphere with a possible impact on the climate system. Recent studies suggest that this forcing is underestimated in current chemistry-climate models. The HEPPA III intercomparison experiment is a collective effort to address this point.

In this study, we apply electron ionization rates from three data-sets in four chemistry-climate models during a geomagnetically active period in April 2010. Results are evaluated by comparison with observations of nitric oxide (NO) in the mesosphere and lower thermosphere. Differences between the ionization rate data-sets have been assessed in a companion study. In the lower thermosphere, NO densities differ by up to one order of magnitude between models using the same ionization rate data-sets due to differences in the treatment of NO formation, model climatology, and model top height. However, a good agreement in the spatial and temporal variability of NO with observations lends confidence that the electron ionization is represented well above 80 km. In the mesosphere, the averages of model results from all chemistry-climate models differ consistently with the differences in the ionization-rate data-sets, but are within the spread of the observations, so no clear assessment on their comparative validity can be provided. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000141757
Veröffentlicht am 10.01.2022
DOI: 10.1029/2021JA029466
Zitationen: 6
Web of Science
Zitationen: 6
Zitationen: 10
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 30.12.2021
Sprache Englisch
Identifikator ISSN: 2169-9380, 2169-9402
KITopen-ID: 1000141757
HGF-Programm 12.11.28 (POF IV, LK 01) The role of the near-Earth space
Erschienen in Journal of geophysical research / Space physics
Verlag John Wiley and Sons
Band 127
Heft 1
Seiten e2021JA029466
Vorab online veröffentlicht am 11.12.2021
Schlagwörter Particle precipitation, radiation-belt electrons, middle atmosphere
Nachgewiesen in Dimensions
Web of Science
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