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| Titel |
Observations of NOx, ΣPNs, ΣANs, and HNO3 at a Rural Site in the California Sierra Nevada Mountains: summertime diurnal cycles |
| VerfasserIn |
D. A. Day, D. K. Farmer, A. H. Goldstein, P. J. Wooldridge, C. Minejima, 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 ; 9, no. 14 ; Nr. 9, no. 14 (2009-07-22), S.4879-4896 |
| Datensatznummer |
250007521
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| Publikation (Nr.) |
 copernicus.org/acp-9-4879-2009.pdf |
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| Zusammenfassung |
| Observations of NO, NO2, total peroxy nitrates (ΣPNs), total
alkyl nitrates (ΣANs), HNO3, CO, O3, and meteorological
parameters were obtained from October 2000 through February 2002 at
1315 m a.s.l., 38.9° N, 120.6° W on Sierra Pacific Industries land,
adjacent to the University of California Blodgett Forest Research Station
(UC-BFRS). We describe the data set with emphasis on the diurnal cycles
during summertime 2001. We show that transport of the Sacramento urban plume
is a primary factor responsible for diurnal variation in total reactive
nitrogen mixing ratios as well as in NOx, ΣPNs and ΣANs,
all of which exhibit a late afternoon/early evening peak. In contrast,
HNO3 has a peak just after local noon indicating that HNO3 is in
near steady state during the day with production due to photochemistry and
removal by deposition and mixing with the background free troposphere.
Boundary layer dynamics influence mixing ratios of all species in the early
morning. Analysis of the morning feature suggests that higher mixing ratios
of NOx and HNO3 persist in the residual layer than in the
nocturnal boundary layer indicating the presence of nocturnal sinks of both
species. Nighttime observations also indicate large HNO3 and ΣANs
production through oxidation of alkenes by NO3. |
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