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| Titel |
Transport analysis of ozone enhancement in Southern Ontario during BAQS-Met |
| VerfasserIn |
H. He, D. W. Tarasick, W. K. Hocking, T. K. Carey-Smith, Y. Rochon, J. Zhang, P. A. Makar, M. Osman, J. Brook, M. D. Moran, D. B. A. Jones, C. Mihele, J. C. Wei, G. Osterman, P. S. Argall, J. McConnell, M. S. Bourqui |
| 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. 6 ; Nr. 11, no. 6 (2011-03-18), S.2569-2583 |
| Datensatznummer |
250009508
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| Publikation (Nr.) |
 copernicus.org/acp-11-2569-2011.pdf |
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| Zusammenfassung |
Twice-daily ozonesondes were launched from Harrow, in southwestern Ontario,
Canada, during the BAQS-Met (Border Air Quality and Meteorology Study) field
campaign in June and July of 2007. A co-located radar windprofiler measured
tropopause height continuously. These data, in combination with continuous
surface ozone measurements and geo-statistical interpolation of satellite
ozone observations, present a consistent picture and indicate that a number
of significant ozone enhancements in the troposphere were observed that were
the result of stratospheric intrusion events. The combined observations have
also been compared with results from two Environment Canada numerical
models, the operational weather prediction model GEM (as input to FLEXPART),
and a new version of the regional air quality model AURAMS, in order to
examine the ability of these models to accurately represent sporadic
cross-tropopause ozone transport events. The models appear to reproduce
intrusion events with some skill, implying that GEM dynamics (which also
drive AURAMS) are able to represent such events well. There are important
differences in the quantitative comparison, however; in particular, the poor
vertical resolution of AURAMS around the tropopause causes it to bring down
too much ozone in individual intrusions.
These campaign results imply that stratospheric intrusions are important to
the ozone budget of the mid-latitude troposphere, and appear to be
responsible for much of the variability of ozone in the free troposphere.
GEM-FLEXPART calculations indicate that stratospheric ozone intrusions
contributed significantly to surface ozone on several occasions during the
BAQS-Met campaign, and made a moderate but significant contribution to the
overall tropospheric ozone budget. |
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