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| Titel |
Trans-Pacific dust events observed at Whistler, British Columbia during INTEX-B |
| VerfasserIn |
I. G. McKendry, A. M. Macdonald, W. R. Leaitch, A. Donkelaar, Q. Zhang, T. Duck, R. V. Martin |
| 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 ; 8, no. 20 ; Nr. 8, no. 20 (2008-10-30), S.6297-6307 |
| Datensatznummer |
250006429
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| Publikation (Nr.) |
 copernicus.org/acp-8-6297-2008.pdf |
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| Zusammenfassung |
| The meteorology and physico-chemical characteristics of aerosol associated
with two new cases of long range dust transport affecting western Canada
during spring 2006 are described. Each event showed enhancements of both
sulfate aerosol and crustal material of Asian origin. However, the events
were of quite different character and demonstrate the highly variable nature
of such events. The April event was a significant dust event with
considerable enhancement of fine particle sulfate while the May event was a
weaker dust event, also with significant fine particle sulfate enhancement.
The latter event was notable in the sense that it was of short duration and
was quickly followed by a large increase of organic material likely of
regional origin. Comparison of these two events with other documented cases
extending back to 1993, suggests that all dust events show coincident
enhancements of sulfate and crustal aerosol. However, events vary across a
wide continuum based on the magnitude of aerosol enhancements and their
sulfate to calcium ratios. At one extreme, events are dominated by highly
significant crustal enhancements (e.g. the well-documented 1998 and 2001
"dust" events) while at the other are events with some dust transport, but
where sulfate enhancements are of very high magnitude (e.g. the 1993 event
at Crater Lake and the 15 May 2006 event at Whistler). Other events
represent a "mix". It is likely that this variability is a function of the
comparative strengths of the dust and anthropogenic SO2 sources, the
transport pathway and in particular the extent to which dust is transported
across industrial SO2 sources, and finally, meteorological and chemical
processes. |
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