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| Titel |
Total Peroxy Nitrates (ΣPNs) in the atmosphere: the Thermal Dissociation-Laser Induced Fluorescence (TD-LIF) technique and comparisons to speciated PAN measurements |
| VerfasserIn |
P. J. Wooldridge, A. E. Perring, T. H. Bertram, F. M. Flocke, J. M. Roberts, H. B. Singh, L. G. Huey, J. A. Thornton, G. M. Wolfe, J. G. Murphy, J. L. Fry, A. W. Rollins, B. W. LaFranchi, R. C. Cohen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 3, no. 3 ; Nr. 3, no. 3 (2010-05-12), S.593-607 |
| Datensatznummer |
250001108
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| Publikation (Nr.) |
 copernicus.org/amt-3-593-2010.pdf |
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| Zusammenfassung |
| Peroxyacetyl nitrate (PAN) and its chemical analogues are increasingly being
quantified in the ambient atmosphere by thermal dissociation (TD) followed
by detection of either the peroxyacyl radical or the NO2 product. Here
we present details of the technique developed at University of California,
Berkeley which detects the sum of all peroxynitrates (ΣPNs) via
laser-induced fluorescence (LIF) of the NO2 product. We review the
various deployments and compare the Berkeley ΣPNs measurements with
the sums of PAN and its homologue species detected individually by other
instruments. The observed TD-LIF ΣPNs usually agree to within 10%
with the summed individual species, thus arguing against the
presence of significant concentrations of unmeasured PAN-type compounds in
the atmosphere, as suggested by some photochemical mechanisms. Examples of
poorer agreement are attributed to a sampling inlet design that is shown to
be inappropriate for high NOx conditions. Interferences to the TD-LIF
measurements are described along with strategies to minimize their effects. |
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