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| Titel |
Multi-year (2004–2008) record of nonmethane hydrocarbons and halocarbons in New England: seasonal variations and regional sources |
| VerfasserIn |
R. S. Russo, Y. Zhou, M. L. White, H. Mao, R. Talbot, B. C. Sive |
| 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 ; 10, no. 10 ; Nr. 10, no. 10 (2010-05-27), S.4909-4929 |
| Datensatznummer |
250008485
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| Publikation (Nr.) |
 copernicus.org/acp-10-4909-2010.pdf |
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| Zusammenfassung |
| Multi-year time series records of C2-C6 alkanes, C2-C4
alkenes, ethyne, isoprene, C6-C8 aromatics, trichloroethene
(C2HCl3), and tetrachloroethene (C2Cl4) from canister
samples collected during January 2004–February 2008 at the University of New
Hampshire (UNH) AIRMAP Observatory at Thompson Farm (TF) in Durham, NH are
presented. The objectives of this work are to identify the sources of
nonmethane hydrocarbons (NMHCs) and halocarbons observed at TF, characterize
the seasonal and interannual variability in ambient mixing ratios and
sources, and estimate regional emission rates of NMHCs. Analysis of
correlations and comparisons with emission ratios indicated that a
ubiquitous and persistent mix of emissions from several anthropogenic
sources is observed throughout the entire year. The highest C2-C8
anthropogenic NMHC mixing ratios were observed in mid to late winter.
Following the springtime minimums, the C3-C6 alkanes,
C7-C8 aromatics, and C2HCl3 increased in early to mid
summer, presumably reflecting enhanced evaporative emissions. Mixing ratios
of C2Cl4 and C2HCl3 decreased by 0.7±0.2 and 0.3±0.05 pptv/year,
respectively, which is indicative of reduced usage
and emissions of these halogenated solvents. Emission rates of
C3-C8 NMHCs were estimated to be 109 to 1010 molecules cm−2 s−1
in winter 2006. The emission rates extrapolated to the
state of New Hampshire and New England were ~2–60 Mg/day and ~12–430 Mg/day, respectively. Emission rates of benzene, toluene,
ethylbenzene, xylenes, and ethyne in the 2002 and 2005 EPA National
Emissions Inventories were within ±50% of the TF emission rates. |
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