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| Titel |
Atmospheric amines and ammonia measured with a chemical ionization mass spectrometer (CIMS) |
| VerfasserIn |
Y. You, V. P. Kanawade, J. A. de Gouw, A. B. Guenther, S. Madronich, M. R. Sierra-Hernández, M. Lawler, J. N. Smith, S. Takahama, G. Ruggeri, A. Koss, K. Olson, K. Baumann, R. J. Weber, A. Nenes, H. Guo, E. S. Edgerton, L. Porcelli, W. H. Brune, A. H. Goldstein, S.-H. Lee |
| 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 ; 14, no. 22 ; Nr. 14, no. 22 (2014-11-19), S.12181-12194 |
| Datensatznummer |
250119173
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| Publikation (Nr.) |
 copernicus.org/acp-14-12181-2014.pdf |
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| Zusammenfassung |
| We report measurements of ambient amines and ammonia with a fast response
chemical ionization mass spectrometer (CIMS) in a southeastern US forest
and a moderately polluted midwestern site during the summer. At the forest
site, mostly C3-amines (from pptv to tens of pptv) and ammonia (up to 2 ppbv) were detected, and they both showed temperature dependencies.
Aerosol-phase amines measured thermal-desorption chemical ionization mass
spectrometer (TDCIMS) showed a higher mass fraction in the evening with
cooler temperatures and lower in the afternoon with warmer temperatures, a
trend opposite to the gas-phase amines. Concentrations of aerosol-phase
primary amines measured with Fourier transform infrared spectroscopy (FTIR)
from micron and submicron particles were 2 orders of magnitude higher
than the gas-phase amines. These results indicate that gas to particle
conversion is one of the major processes that control the ambient amine
concentrations at this forest site. Temperature dependencies of C3-amines and
ammonia also imply reversible processes of evaporation of these
nitrogen-containing compounds from soil surfaces in daytime and deposition
to soil surfaces at nighttime. During the transported biomass burning plume
events, various amines (C1–C6) appeared at the pptv level, indicating that
biomass burning is a substantial source of amines in the
southeastern US. At the moderately polluted Kent site, there were higher concentrations
of C1- to C6-amines (pptv to tens of pptv) and ammonia (up to 6 ppbv). C1-
to C3-amines and ammonia were well correlated with the ambient temperature.
C4- to C6-amines showed frequent spikes during the nighttime, suggesting
that they were emitted from local sources. These abundant amines and ammonia
may in part explain the frequent new particle formation events reported from
Kent. Higher amine concentrations measured at the polluted site than at the
rural forested site highlight the importance of constraining anthropogenic
emission sources of amines. |
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