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| Titel |
Influence of modelled soil biogenic NO emissions on related trace gases and the atmospheric oxidizing efficiency |
| VerfasserIn |
J. Steinkamp, L. N. Ganzeveld, W. Wilcke, M. G. Lawrence |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 8 ; Nr. 9, no. 8 (2009-04-23), S.2663-2677 |
| Datensatznummer |
250007205
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| Publikation (Nr.) |
 copernicus.org/acp-9-2663-2009.pdf |
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| Zusammenfassung |
| The emission of nitric oxide (NO) by soils (SNOx) is an important
source of oxides of nitrogen (NOx=NO+NO2) in the
troposphere, with estimates ranging from 4 to 21 Tg of nitrogen per
year. Previous studies have examined the influence of SNOx on ozone
(O3) chemistry. We employ the ECHAM5/MESSy atmospheric chemistry
model (EMAC) to go further in the reaction chain and investigate the
influence of SNOx on lower tropospheric NOx, O3,
peroxyacetyl nitrate (PAN), nitric acid (HNO3), the hydroxyl
radical (OH) and the lifetime of methane (τCH4). We
show that SNOx is responsible for a significant contribution to the
NOx mixing ratio in many regions, especially in the
tropics. Furthermore, the concentration of OH is substantially
increased due to SNOx, resulting in an enhanced oxidizing efficiency
of the global troposphere, reflected in a ~10% decrease in
τCH4 due to soil NO emissions. On the other hand, in
some regions SNOx has a negative feedback on the lifetime of
NOx through O3 and OH, which results in regional increases
in the mixing ratio of NOx despite lower total emissions in a
simulation without SNOx. In a sensitivity simulation in which we
reduce the other surface NOx emissions by the same amount as
SNOx, we find that they have a much weaker impact on OH and
τCH4 and do not result in an increase in the
NOx mixing ratio anywhere. |
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