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| Titel |
Constraints on instantaneous ozone production rates and regimes during DOMINO derived using in-situ OH reactivity measurements |
| VerfasserIn |
V. Sinha, J. Williams, J. M. Diesch, F. Drewnick, M. Martinez, H. Harder, E. Regelin, D. Kubistin, H. Bozem, Z. Hosaynali-Beygi, H. Fischer, M. D. Andrés-Hernández, D. Kartal, J. A. Adame, J. Lelieveld  |
| 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. 15 ; Nr. 12, no. 15 (2012-08-09), S.7269-7283 |
| Datensatznummer |
250011382
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| Publikation (Nr.) |
 copernicus.org/acp-12-7269-2012.pdf |
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| Zusammenfassung |
| In this study air masses are characterized in terms of their total OH
reactivity which is a robust measure of the "reactive air pollutant
loading". The measurements were performed during the DOMINO campaign (Diel
Oxidant Mechanisms In relation to Nitrogen Oxides) held from 21/11/2008 to
08/12/2008 at the Atmospheric Sounding Station – El Arenosillo
(37.1° N–6.7° W, 40 m a.s.l.). The site was frequently impacted by marine air masses
(arriving at the site from the southerly sector) and air masses from the
cities of Huelva (located NW of the site), Seville and Madrid (located
NNE of the site). OH reactivity values showed strong wind sector
dependence. North eastern "continental" air masses were characterized by
the highest OH reactivities (average: 31.4 ± 4.5 s−1; range of
average diel values: 21.3–40.5 s−1), followed by north western
"industrial" air masses (average: 13.8 ± 4.4 s−1; range of
average diel values: 7–23.4 s−1) and marine air masses (average:
6.3 ± 6.6 s−1; range of average diel values: below detection
limit −21.7 s−1), respectively. The average OH reactivity for the
entire campaign period was ~18 s−1 and no pronounced variation
was discernible in the diel profiles with the exception of relatively high
values from 09:00 to 11:00 UTC on occasions when air masses arrived from
the north western and southern wind sectors. The measured OH reactivity was
used to constrain both diel instantaneous ozone production potential rates
and regimes. Gross ozone production rates at the site were generally limited
by the availability of NOx with peak values of around 20 ppbV
O3 h−1. Using the OH reactivity based approach, derived ozone production
rates indicate that if NOx would no longer be the limiting factor in
air masses arriving from the continental north eastern sector, peak ozone
production rates could double. We suggest that the new combined approach of
in-situ fast measurements of OH reactivity, nitrogen oxides and peroxy
radicals for constraining instantaneous ozone production rates, could
significantly improve analyses of upwind point sources and their impact on
regional ozone levels. |
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