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| Titel |
Investigating types and sources of organic aerosol in Rocky Mountain National Park using aerosol mass spectrometry |
| VerfasserIn |
M. I. Schurman, T. Lee, Y. Sun, B. A. Schichtel, S. M. Kreidenweis, J. L. Jr. Collett |
| 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 ; 15, no. 2 ; Nr. 15, no. 2 (2015-01-20), S.737-752 |
| Datensatznummer |
250119336
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| Publikation (Nr.) |
 copernicus.org/acp-15-737-2015.pdf |
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| Zusammenfassung |
| The environmental impacts of atmospheric particles are highlighted in remote
areas where visibility and ecosystem health can be degraded by even
relatively low particle concentrations. Submicron particle size,
composition, and source apportionment were explored at Rocky Mountain
National Park using a High-Resolution Time-of-Flight Aerosol Mass
Spectrometer. This summer campaign found low average, but variable,
particulate mass (PM) concentrations (max = 93.1 μg m−3,
avg. = 5.13 ± 2.72 μg m−3) of which 75.2 ± 11.1% is
organic. Low-volatility oxidized organic aerosol (LV-OOA, 39.3%
of PM1 on average) identified using Positive Matrix
Factorization appears to be mixed with ammonium sulfate (3.9% and
16.6% of mass, respectively), while semi-volatile OOA (27.6%) is
correlated with ammonium nitrate (nitrate: 4.3%); concentrations of these
mixtures are enhanced with upslope (SE) surface winds from the densely
populated Front Range area, indicating the importance of transport. A local
biomass burning organic aerosol (BBOA, 8.4%) source is suggested by mass
spectral cellulose combustion markers (m/z 60 and 73) limited to brief,
high-concentration, polydisperse events (suggesting fresh combustion), a
diurnal maximum at 22:00 local standard time when campfires were set
at adjacent summer camps, and association with surface winds consistent with
local campfire locations. The particle characteristics determined here
represent typical summertime conditions at the Rocky Mountain site based on
comparison to ~10 years of meteorological, particle
composition, and fire data. |
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