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| Titel |
Aerosol plume transport and transformation in high spectral resolution lidar measurements and WRF-Flexpart simulations during the MILAGRO Field Campaign |
| VerfasserIn |
B. Foy, S. P. Burton, R. A. Ferrare, C. A. Hostetler, J. W. Hair, C. Wiedinmyer, L. T. Molina |
| 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. 7 ; Nr. 11, no. 7 (2011-04-15), S.3543-3563 |
| Datensatznummer |
250009610
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| Publikation (Nr.) |
 copernicus.org/acp-11-3543-2011.pdf |
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| Zusammenfassung |
| The Mexico City Metropolitan Area (MCMA) experiences high loadings of
atmospheric aerosols from anthropogenic sources, biomass burning and
wind-blown dust. This paper uses a combination of measurements and numerical
simulations to identify different plumes affecting the basin and to
characterize transformation inside the plumes. The High Spectral
Resolution Lidar on board the NASA LaRC B-200 King Air aircraft
measured extinction coefficients and extinction to
backscatter ratio at 532 nm, and backscatter coefficients and depolarization
ratios at 532 and 1064 nm. These can be used to identify aerosol types. The
measurement curtains are compared with particle trajectory simulations using
WRF-Flexpart for different source groups. The good correspondence between
measurements and simulations suggests that the aerosol transport is
sufficiently well characterized by the models to estimate aerosol types and
ages. Plumes in the basin undergo complex transport, and are frequently mixed
together. Urban aerosols are readily identifiable by their low depolarization
ratios and high lidar ratios, and dust by the opposite properties. Fresh
biomass burning plumes have very low depolarization ratios which increase
rapidly with age. This rapid transformation is consistent with the presence
of atmospheric tar balls in the fresh plumes. |
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