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| Titel |
Observations of atmosphere-biosphere exchange of total and speciated peroxynitrates: nitrogen fluxes and biogenic sources of peroxynitrates |
| VerfasserIn |
K.-E. Min, S. E. Pusede, E. C. Browne, B. W. LaFranchi, P. J. Wooldridge, G. M. Wolfe, S. A. Harrold, J. A. Thornton, R. C. Cohen |
| 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. 20 ; Nr. 12, no. 20 (2012-10-29), S.9763-9773 |
| Datensatznummer |
250011534
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| Publikation (Nr.) |
 copernicus.org/acp-12-9763-2012.pdf |
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| Zusammenfassung |
| Peroxynitrates are responsible for global scale transport of reactive
nitrogen. Recent laboratory observations suggest that they may also play an
important role in delivery of nutrients to plant canopies. We measured eddy
covariance fluxes of total peroxynitrates (ΣPNs) and three individual
peroxynitrates (APNs ≡ PAN + PPN + MPAN) over a ponderosa pine
forest during the Biosphere Effects on AeRosols and Photochemistry EXperiment
2009 (BEARPEX 2009). Concentrations of these species were also measured at
multiple heights above and within the canopy. While the above-canopy daytime
concentrations are nearly identical for ΣPNs and APNs, we observed the
downward flux of ΣPNs to be 30–60% slower than the flux of APNs.
The vertical concentration gradients of ΣPNs and APNs vary with time
of day and exhibit different temperature dependencies. These differences can
be explained by the production of peroxynitrates other than PAN, PPN, and
MPAN within the canopy (presumably as a consequence of biogenic VOC
emissions) and upward fluxes of these PN species. The impact of this implied
peroxynitrate flux on the interpretation of NOx fluxes and
ecosystem N exchange is discussed. |
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