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| Titel |
Californian forest fire plumes over Southwestern British Columbia: lidar, sunphotometry, and mountaintop chemistry observations |
| VerfasserIn |
I. McKendry, K. Strawbridge, M. L. Karumudi, N. O'Neill, A. M. Macdonald, R. Leaitch, D. Jaffe, P. Cottle, S. Sharma, P. Sheridan, J. 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 ; 11, no. 2 ; Nr. 11, no. 2 (2011-01-17), S.465-477 |
| Datensatznummer |
250009177
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| Publikation (Nr.) |
 copernicus.org/acp-11-465-2011.pdf |
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| Zusammenfassung |
| Forest fires in Northern California and Oregon were responsible for two
significant regional scale aerosol transport events observed in southern
British Columbia during summer 2008. A combination of ground based
(CORALNet) and satellite (CALIPSO) lidar, sunphotometry and high altitude
chemistry observations permitted unprecedented characterization of forest
fire plume height and mixing as well as description of optical properties
and physicochemistry of the aerosol. In southwestern BC, lidar observations show
the smoke to be mixed through a layer extending to 5–6 km a.g.l. where the
aerosol was confined by an elevated inversion in both cases. Depolarization
ratios for a trans-Pacific dust event (providing a basis for comparison) and
the two smoke events were consistent with observations of dust and smoke
events elsewhere and permit discrimination of aerosol events in the region.
Based on sunphotometry, the Aerosol Optical Thicknesses (AOT) reached maxima
of ~0.7 and ~0.4 for the two events respectively.
Dubovik-retrieval values of reff, f during both the June/July and August
events varied between about 0.13 and 0.15 μm and confirm the dominance
of accumulation mode size particles in the forest fire plumes. Both Whistler
Peak and Mount Bachelor Observatory data show that smoke events are
accompanied by elevated CO and O3 concentrations as well as elevated
K+/SO4 ratios. In addition to documenting the meteorology and
physic-chemical characteristics of two regional scale biomass burning
plumes, this study demonstrates the positive analytical synergies arising
from the suite of measurements now in place in the Pacific Northwest, and
complemented by satellite borne instruments. |
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