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| Titel |
Evaluation of two isoprene emission models for use in a long-range air pollution model |
| VerfasserIn |
A. Zare, J. H. Christensen, P. Irannejad, J. Brandt |
| 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 ; 12, no. 16 ; Nr. 12, no. 16 (2012-08-16), S.7399-7412 |
| Datensatznummer |
250011392
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| Publikation (Nr.) |
 copernicus.org/acp-12-7399-2012.pdf |
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| Zusammenfassung |
| Knowledge about isoprene emissions and concentration distribution is
important for chemistry transport models (CTMs), because isoprene acts as a
precursor for tropospheric ozone and subsequently affects the atmospheric
concentrations of many other atmospheric compounds. Isoprene has a short
lifetime, and hence it is very difficult to evaluate its emission estimates
against measurements. For this reason, we coupled two isoprene emission
models with the Danish Eulerian Hemispheric Model (DEHM), and evaluated the
simulated background ozone concentrations based on different models for
isoprene emissions. In this research, results of using the two global
biogenic emission models; GEIA (Global Emissions Inventory Activity) and
MEGAN (the global Model of Emissions of Gases and Aerosols from Nature) are
compared and evaluated. The total annual emissions of isoprene for the year
2006 estimated by using MEGAN is 592 Tg yr−1 for an extended area of the
Northern Hemisphere, which is 21% higher than that estimated by using
GEIA. The overall feature of the emissions from the two models is quite
similar, but differences are found mainly in Africa's savannah and in the
southern part of North America. Differences in spatial distribution of
emission factors are found to be a key source of these discrepancies. In
spite of the short life-time of isoprene, a direct evaluation of isoprene
concentrations using the two biogenic emission models in DEHM has been made
against available measurements in Europe. Results show an agreement between
two models simulations and the measurements in general and that the CTM is
able to simulate isoprene concentrations. Additionally, investigation of
ozone concentrations resulting from the two biogenic emission models show
that isoprene simulated by MEGAN strongly affects the ozone production in
the African savannah; the effect is up to 10% more than that obtained
using GEIA. In contrast, the impact of using GEIA is higher in the Amazon
region with more than 8% higher ozone concentrations compared to that of
using MEGAN. Comparing the ozone concentrations obtained by DEHM using the
two different isoprene models with measurements from Europe and North
America, show an agreement on the hourly, mean daily and daily maximum
values. However, the average of ozone daily maximum value simulated by using
MEGAN is slightly closer to the measured value for the average of all
measuring sites in Europe. |
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