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| Titel |
Cold and transition season cloud condensation nuclei measurements in western Colorado |
| VerfasserIn |
D. S. Ward, W. R. Cotton |
| 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 ; 11, no. 9 ; Nr. 11, no. 9 (2011-05-10), S.4303-4317 |
| Datensatznummer |
250009705
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| Publikation (Nr.) |
 copernicus.org/acp-11-4303-2011.pdf |
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| Zusammenfassung |
| Recent studies have shown that orographic precipitation and the water
resources that depend on it in the Colorado Rocky Mountains are sensitive to
the variability of the region's aerosols, whether emitted locally or from
distant sources. However, observations of cloud droplet nucleating aerosols
in western Colorado, climatologically upwind of the Colorado Rocky
Mountains, have been limited to a few studies at a single, northern site. To
address this knowledge gap, atmospheric aerosols were sampled at a ground
site in southwestern Colorado and in low-level north to south transects of
the Colorado Western Slope as part of the Inhibition of Snowfall by
Pollution Aerosols (ISPA-III) field campaign. Total particle and cloud
condensation nuclei (CCN) number concentrations were measured for a 24-day
period in Mesa Verde National Park, in September and October 2009. Regression
analysis showed a positive relationship between mid-troposphere atmospheric
pressure to the west of the site and the total particle count at the ground
site, but no similar statistically significant relationship was found for the observed CCN.
These data were supplemented with particle and CCN number
concentration, as well as particle size distribution measurements collected aboard the King Air
platform during December 2009. A CCN closure attempt was performed and suggested that the sampled
aerosol may have had a low hygroscopicity that changed little with the
large-scale wind direction. Together, the sampled aerosols from these field
programs were characteristic of a rural continental environment with CCN
number concentrations that varied slowly in time, and little in space along
the Western Slope. |
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