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| Titel |
Biomass burning related ozone damage on vegetation over the Amazon forest: a model sensitivity study |
| VerfasserIn |
F. Pacifico, G. A. Folberth, S. Sitch, J. M. Haywood, L. V. Rizzo, F. F. Malavelle, P. Artaxo |
| 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. 5 ; Nr. 15, no. 5 (2015-03-10), S.2791-2804 |
| Datensatznummer |
250119515
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| Publikation (Nr.) |
 copernicus.org/acp-15-2791-2015.pdf |
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| Zusammenfassung |
| The HadGEM2 earth system climate model was used to assess the impact of
biomass burning on surface ozone concentrations over the Amazon forest and
its impact on vegetation, under present-day climate conditions. Here we
consider biomass burning emissions from wildfires, deforestation fires,
agricultural forest burning, and residential and commercial combustion. Simulated
surface ozone concentration is evaluated against observations taken at two
sites in the Brazilian Amazon forest for years 2010 to 2012. The model is
able to reproduce the observed diurnal cycle of surface ozone mixing ratio at
the two sites, but overestimates the magnitude of the monthly averaged hourly
measurements by 5–15 ppb for each available month at one of the sites. We
vary biomass burning emissions over South America by ±20, 40, 60, 80 and
100% to quantify the modelled impact of biomass burning on surface ozone
concentrations and ozone damage on vegetation productivity over the Amazon
forest. We used the ozone damage scheme in the "high" sensitivity mode to
give an upper limit for this effect. Decreasing South American biomass
burning emissions by 100% (i.e. to zero) reduces surface ozone
concentrations (by about 15 ppb during the biomass burning season) and
suggests a 15% increase in monthly mean net primary productivity
averaged over the Amazon forest, with local increases up to 60%. The
simulated impact of ozone damage from present-day biomass burning on
vegetation productivity is about 230 TgC yr−1. Taking into account
that uncertainty in these estimates is substantial, this ozone damage impact
over the Amazon forest is of the same order of magnitude as the release of
carbon dioxide due to fire in South America; in effect it potentially doubles
the impact of biomass burning on the carbon cycle. |
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