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| Titel |
Long-term study of VOCs measured with PTR-MS at a rural site in New Hampshire with urban influences |
| VerfasserIn |
C. Jordan, E. Fitz, T. Hagan, B. Sive, E. Frinak, K. Haase, L. Cottrell, S. Buckley, R. Talbot |
| 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 (2009-07-17), S.4677-4697 |
| Datensatznummer |
250007509
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| Publikation (Nr.) |
 copernicus.org/acp-9-4677-2009.pdf |
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| Zusammenfassung |
| A long-term, high time-resolution volatile organic compound (VOC) data set
from a ground site that experiences urban, rural, and marine influences in
the Northeastern United States is presented. A proton-transfer-reaction mass
spectrometer (PTR-MS) was used to quantify 15 VOCs: a marine tracer dimethyl
sulfide (DMS), a biomass burning tracer acetonitrile, biogenic compounds
(monoterpenes, isoprene), oxygenated VOCs (OVOCs: methyl vinyl ketone (MVK)
plus methacrolein (MACR), methanol, acetone, methyl ethyl ketone (MEK),
acetaldehyde, and acetic acid), and aromatic compounds (benzene, toluene,
C8 and C9 aromatics). Time series, overall and seasonal medians,
with 10th and 90th percentiles, seasonal mean diurnal profiles,
and inter-annual comparisons of mean summer and winter diurnal profiles are
shown. Methanol and acetone exhibit the highest overall median mixing ratios
1.44 and 1.02 ppbv, respectively. Comparing the mean diurnal profiles of
less well understood compounds (e.g., MEK) with better known compounds
(e.g., isoprene, monoterpenes, and MVK + MACR) that undergo various controls
on their atmospheric mixing ratios provides insight into possible sources of
the lesser known compounds. The constant diurnal value of ~0.7 for the
toluene:benzene ratio in winter, may possibly indicate the influence of
wood-based heating systems in this region. Methanol exhibits an initial
early morning release in summer unlike any other OVOC (or isoprene) and a
dramatic late afternoon mixing ratio increase in spring. Although several of
the OVOCs appear to have biogenic sources, differences in features observed
between isoprene, methanol, acetone, acetaldehyde, and MEK suggest they are
produced or emitted in unique ways. |
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