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| Titel |
Declining ozone exposure of European vegetation under climate change and reduced precursor emissions |
| VerfasserIn |
J. Klingberg, M. Engardt, P. E. Karlsson, J. Langner, H. Pleijel |
| 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 ; 11, no. 19 ; Nr. 11, no. 19 (2014-10-01), S.5269-5283 |
| Datensatznummer |
250117617
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| Publikation (Nr.) |
 copernicus.org/bg-11-5269-2014.pdf |
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| Zusammenfassung |
| The impacts of changes in ozone precursor emissions as well as climate
change on the future ozone exposure of the vegetation in Europe were
investigated. The ozone exposure is expressed as AOT40 (Accumulated
exposure Over a Threshold of 40 ppb O3) as well as PODY
(Phytotoxic Ozone Dose above a threshold Y). A new method is
suggested to express how the length of the period during the year when
coniferous and evergreen trees are sensitive to ozone might be affected by
climate change. Ozone precursor emission changes from the RCP4.5 scenario
were combined with climate simulations based on the IPCC SRES A1B scenario
and used as input to the Eulerian Chemistry Transport Model MATCH from which
projections of ozone concentrations were derived. The ozone exposure of
vegetation over Europe expressed as AOT40 was projected to be substantially
reduced between the periods 1990–2009 and 2040–2059 to levels which are well
below critical levels used for vegetation in the EU directive 2008/50/EC as
well as for crops and forests used in the LRTAP convention, despite that the
future climate resulted in prolonged yearly ozone sensitive periods. The
reduction in AOT40 was mainly driven by the emission reductions, not changes
in the climate. For the toxicologically more relevant POD1 index the
projected reductions were smaller, but still significant. The values for
POD1 for the time period 2040–2059 were not projected to decrease to
levels which are below critical levels for forest trees, represented by
Norway spruce. This study shows that substantial reductions of ozone
precursor emissions have the potential to strongly reduce the future risk
for ozone effects on the European vegetation, even if concurrent climate
change promotes ozone formation. |
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