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| Titel |
Contributions of dust and biomass burning to aerosols at a Colorado mountain-top site |
| VerfasserIn |
A. G. Hallar, R. Petersen, E. Andrews, J. Michalsky, I. B. McCubbin, J. A. Ogren |
| 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. 23 ; Nr. 15, no. 23 (2015-12-10), S.13665-13679 |
| Datensatznummer |
250120218
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| Publikation (Nr.) |
 copernicus.org/acp-15-13665-2015.pdf |
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| Zusammenfassung |
Visible Multifilter Rotating Shadowband Radiometer (vis-MFRSR) data were
collected at Storm Peak Laboratory (SPL), a mountain-top facility in
northwest Colorado, from 1999 to 2011 and in 2013. From 2011 to 2014, in situ
measurements of aerosol light scattering were also obtained. Using these
data sets together, the seasonal impact of dust and biomass burning is
considered for the western USA. Analysis indicates that the median
contributions to spring and summer aerosol optical depth (AOD) from dust and
biomass-burning aerosols across the data set are comparable. The mean AOD is
slightly greater in the summer, with significantly more frequent and short-duration high AOD measurements due to biomass-burning episodes than in the
spring. The Ångström exponent showed a significant increase in the
summer for both the in situ and vis-MFRSR data, suggesting an increase in
combustion aerosols. Spring dust events are less distinguishable in the
in situ data than the column measurement, suggesting that a significant
amount of dust may be found above the elevation of SPL, 3220 m a.s.l.
Twenty-two known case studies of intercontinental dust, regional dust, and
biomass-burning events were investigated. These events were found to follow
a similar pattern, in both aerosol loading and Ångström exponent, as
the seasonal mean signal in both the vis-MFRSR and ground-based nephelometer.
This data set highlights the wide-scale implications of a warmer, drier
climate on visibility in the western USA. |
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