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| Titel |
Ozone vegetation damage effects on gross primary productivity in the United States |
| VerfasserIn |
X. Yue, N. Unger |
| 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 ; 14, no. 17 ; Nr. 14, no. 17 (2014-09-05), S.9137-9153 |
| Datensatznummer |
250119006
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| Publikation (Nr.) |
 copernicus.org/acp-14-9137-2014.pdf |
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| Zusammenfassung |
| We apply an off-line process-based vegetation model (the Yale Interactive
Terrestrial Biosphere model) to assess the impacts of ozone (O3)
vegetation damage on gross primary productivity (GPP) in the United States
during the past decade (1998–2007). The model's GPP simulation is evaluated
at 40 sites of the North American Carbon Program (NACP) synthesis. The
ecosystem-scale model version reproduces interannual variability and
seasonality of GPP at most sites, especially in croplands. Inclusion of the
O3 damage impact decreases biases of simulated GPP at most of the NACP
sites. The simulation with the O3 damage effect reproduces 64% of
the observed variance in summer GPP and 42% on the annual average. Based
on a regional gridded simulation over the US, summertime average
O3-free GPP is 6.1 g C m−2 day−1 (9.5 g C m−2 day−1
in the east of 95° W and 3.9 g C m−2 day−1 in the west).
O3 damage decreases GPP by 4–8% on average in the eastern US and
leads to significant decreases of 11–17% in east coast hot spots.
Sensitivity simulations show that a 25% decrease in surface O3
concentration halves the average GPP damage to only 2–4%, suggesting the
substantial co-benefits to ecosystem health that may be achieved via O3
air pollution control. |
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