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| Titel |
Sensitivity of tropospheric loads and lifetimes of short lived pollutants to fire emissions |
| VerfasserIn |
N. Daskalakis, S. Myriokefalitakis, M. Kanakidou |
| 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 ; 15, no. 6 ; Nr. 15, no. 6 (2015-03-31), S.3543-3563 |
| Datensatznummer |
250119588
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| Publikation (Nr.) |
 copernicus.org/acp-15-3543-2015.pdf |
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| Zusammenfassung |
| The capability of global chemistry and transport models (CTMs) to simulate
atmospheric composition and its spatial and temporal changes highly relies
on the input data used by the models, in particular the emission
inventories. Biomass burning emissions show large spatial, diurnal, seasonal
and year-to-year variability. In the present study, we applied a global 3-D
CTM to evaluate uncertainties in the computed atmospheric composition
associated with the use of different biomass burning emissions and identify
areas where observational data can help to reduce these uncertainties. We
find the emission inventory choice to lead to regional differences in the
calculated load of aerosols up to a factor of 4. Assumptions on the
injection height of the biomass burning emissions are found to produce
regionally up to 30% differences in the calculated tropospheric lifetimes
of pollutants. Computed changes in lifetimes point to a strong chemical
feedback mechanism between emissions from biomass burning and isoprene
emissions from vegetation that are linked via NOx-driven oxidant
chemistry, NOx-dependent changes in isoprene oxidation products,
aerosol emissions and atmospheric transport. These interactions reduce
isoprene load in the presence of biomass burning emissions by 15%,
calculated for the same amount of isoprene emitted into the troposphere.
Thus, isoprene load and lifetime are inversely related to the quantities of
pollutants emitted by biomass burning. These interactions are shown to be able to
increase the global annual secondary aerosol yield from isoprene emissions,
defined as the ratio of tropospheric loads of secondary aerosol from
isoprene oxidation to isoprene emissions, by up to 18%. |
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