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| Titel |
Study of the biogenic soil NOx emissions from the Australian desert. |
| VerfasserIn |
Penelope Maher, Guergana Guerova, Symeon Koumoutsaris, George Takacs |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250049226
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| Zusammenfassung |
| Nitrogen oxides (NOx) originate from various anthropogenic and natural sources. NOx is a
trace gas with broad climate and environmental implications including: acid rain, urban
smog, decreasing visibility, soil and stream acidification from leaching and eutrophication.
Globally, anthropogenic NOx emissions are well characterised, however, biogenic soil
emissions are poorly accounted for. This is partly due the difficulty in performing ground
based campaign in remote regions. This study is a first attempt to quantify the soil
NOx emissions from the Australian Desert using the synergy between satellite
observations from GOME and simulations with global chemistry and transport model
GEOS-Chem.
Soil NOx emissions from the Australian desert, an area covering 2.5 million km2, are
investigated for the year 2000. Inverse modeled NOx emissions were obtained by combining
the a priori NOx emissions from GEOS-Chem with GOME and GEOS-Chem
tropospheric NO2 columns, to produce a posteriori emission inventory. The total a
posterior soil emissions for Australia in 2000 are 0.70 TgN, which accounts for 8% of
the global soil NOx emissions. The a posteriori soil emissions from Australia
are a factor of 1.7 higher than the a priori. A posteriori soil emissions from the
desert in 2000 are 0.31 TgN, which accounts for about 4% of the global soil NOx
emissions.
Soil emissions from the desert peak during spring (October, November and December)
with a posteriori emission of 0.11 TgN, accounting for 1.3% of global soil emissions. The
soil NOx emissions from the Australian desert are of the same order of magnitude as the
Australian anthropogenic emissions and have the potential to influence air quality in the
spring/summer. |
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