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| Titel |
European emissions of isoprene and monoterpenes from the Last Glacial Maximum to present |
| VerfasserIn |
G. Schurgers, T. Hickler, P. A. Miller, A. Arneth |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 12 ; Nr. 6, no. 12 (2009-12-03), S.2779-2797 |
| Datensatznummer |
250004213
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| Publikation (Nr.) |
 copernicus.org/bg-6-2779-2009.pdf |
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| Zusammenfassung |
Biogenic volatile organic compounds (BVOC), such as isoprene and
monoterpenes, play an important role in atmospheric processes. BVOC species
are oxidized in the atmosphere and influence levels of ozone. The less
volatile amongst the BVOC and their oxidation products are important for the
formation and growth of secondary biogenic aerosol. In this way, the Earth's
radiation balance is affected.
Geographic distribution and temporal changes in BVOC emissions are highly
uncertain. Here we assessed changes in emission patterns across Europe since
the Last Glacial Maximum (LGM) with a dynamic vegetation model. This model
reproduces European tree species distribution and includes a process-based
algorithm for terpenoid production. In a set of simulations the model was
driven with paleoclimate anomalies and reconstructed CO2 concentrations.
We quantified three main driving factors for the changes in emissions of
isoprene and monoterpenes since the LGM: (1) the changes in climate, with
temperature changes as the most important factor affecting plant physiology
and terpenoid production in all plant species, (2) a change in species
distribution related to the changes in climate, causing local shifts in
emission characteristics of the vegetation, and (3) a change in CO2
concentration, causing opposing effects on the availability of different
substrates for terpenoid production. The effect of atmospheric CO2
concentration is particularly uncertain, but sensitivity simulations showed
an increase in European BVOC emissions in all sensitivity experiments
irrespective of the use of a direct inhibition of terpenoid production by
CO2. The effects of climate change on physiology and terpenoid production
resulted in an overall relatively uniform increase of emissions in Europe
over the simulation period, but regionally the effect of changes in species
distribution and the related changes in emission capacities resulted in
changes of emissions that can dominate over the physiology effects. This may
have consequences for regional atmospheric chemistry simulations for the
past, that have to rely on suitable geographic patterns of forest emissions. |
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