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| Titel |
Simulations of a cold-air pool associated with elevated wintertime ozone in the Uintah Basin, Utah |
| VerfasserIn |
E. M. Neemann, E. T. Crosman, J. D. Horel, L. Avey |
| 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. 1 ; Nr. 15, no. 1 (2015-01-09), S.135-151 |
| Datensatznummer |
250119290
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| Publikation (Nr.) |
 copernicus.org/acp-15-135-2015.pdf |
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| Zusammenfassung |
| Numerical simulations are used to investigate the meteorological
characteristics of the 31 January–6 February 2013 cold-air pool in the
Uintah Basin, Utah, and the resulting high ozone concentrations. Flow
features affecting cold-air pools and air quality in the Uintah Basin are
studied, including the following: penetration of clean air into the basin from across the
surrounding mountains, elevated easterlies within the inversion layer, and
thermally driven slope and valley flows. The sensitivity of the boundary
layer structure to snow cover variations and cloud microphysics are also
examined. Snow cover increases boundary layer stability by enhancing the
surface albedo, reducing the absorbed solar insolation at the surface, and
lowering near-surface air temperatures. Snow cover also increases ozone
levels by enhancing solar radiation available for photochemical reactions.
Ice-dominant clouds enhance cold-air pool strength compared to
liquid-dominant clouds by increasing nocturnal cooling and decreasing
longwave cloud forcing. |
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