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| Titel |
On the export of reactive nitrogen from Asia: NOx partitioning and effects on ozone |
| VerfasserIn |
T. H. Bertram, A. E. Perring, P. J. Wooldridge, J. Dibb, M. A. Avery, 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 ; 13, no. 9 ; Nr. 13, no. 9 (2013-05-06), S.4617-4630 |
| Datensatznummer |
250018630
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| Publikation (Nr.) |
 copernicus.org/acp-13-4617-2013.pdf |
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| Zusammenfassung |
| The partitioning of reactive nitrogen (NOy was measured over the
remote North Pacific during spring 2006. Aircraft observations of NO,
NO2, total peroxy nitrates (ΣPNs), total alkyl and
multi-functional nitrates (ΣANs) and nitric acid (HNO3, made
between 25° and 55° N, confirm a controlling
role for peroxyacyl nitrates in NOx production in aged Asian outflow.
ΣPNs account for more than 60% of NOy above 5 km, while
thermal dissociation limits their contribution to less than 10% in the
lower troposphere. Using simultaneous observations of NOx, ΣPNs,
ΣANs, HNO3 and average wind speed, we calculate the
flux of reactive nitrogen through the meridional plane of
150° W (between 20° and 55° N) to be 0.007 ± 0.002 Tg N day−1, which provides an upper limit
of 23 ± 6.5% on the transport efficiency of NOy from East
Asia. Observations of NOx, and HOx are used to constrain a 0-D
photochemical box model for the calculation of net photochemical ozone
production or tendency (Δ O3) as a function of aircraft altitude
and NOx concentrations. The model analysis indicates that the
photochemical environment of the lower troposphere (altitude < 6 km)
over the north Pacific is one of net O3 destruction, with an
experimentally determined crossover point between net O3 destruction
and net O3 production of 60 pptv NOx. Qualitative indicators of
integrated net O3 production derived from simultaneous measurements of
O3 and light alkanes (Parrish et al., 1992), also indicate that the north Pacific
is, on average, a region of net O3 destruction. |
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