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| Titel |
Impacts of transported background ozone on California air quality during the ARCTAS-CARB period – a multi-scale modeling study |
| VerfasserIn |
M. Huang, G. R. Carmichael, B. Adhikary, S. N. Spak, S. Kulkarni, Y. F. Cheng, C. Wei, Y. Tang, D. D. Parrish, S. J. Oltmans, A. D'Allura, A. Kaduwela, C. Cai, A. J. Weinheimer, M. Wong, R. B. Pierce, J. A. Al-Saadi, D. G. Streets, Q. Zhang |
| 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 ; 10, no. 14 ; Nr. 10, no. 14 (2010-07-30), S.6947-6968 |
| Datensatznummer |
250008664
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| Publikation (Nr.) |
 copernicus.org/acp-10-6947-2010.pdf |
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| Zusammenfassung |
| Multi-scale tracer and full-chemistry simulations with the STEM atmospheric
chemistry model are used to analyze the effects of transported background
ozone (O3) from the eastern Pacific on California air quality during
the ARCTAS-CARB experiment conducted in June, 2008. Previous work has
focused on the importance of long-range transport of O3 to North
America air quality in springtime. However during this summer experiment the
long-range transport of O3 is also shown to be important. Simulated and
observed O3 transport patterns from the coast to inland northern
California are shown to vary based on meteorological conditions and the
O3 profiles over the oceans, which are strongly episodically affected
by Asian inflows. Analysis of the correlations of O3 at various
altitudes above the coastal site at Trinidad Head and at a downwind surface
site in northern California, show that under long-range transport events,
high O3 air-masses (O3>60 ppb) at altitudes between about 2
and 4 km can be transported inland and can significantly influence surface
O3 20–30 h later. These results show the importance of
characterizing the vertical structure of the lateral boundary conditions
(LBC) needed in air quality simulations. The importance of the LBC on O3
prediction during this period is further studied through a series of
sensitivity studies using different forms of LBC. It is shown that the use
of the LBC downscaled from RAQMS global model that assimilated MLS and OMI
data improves the model performance. We also show that the predictions can
be further improved through the use of LBC based on NASA DC-8 airborne
observations during the ARCTAS-CARB experiment. These results indicate the
need to develop observational strategies to provide information on the
three-dimensional nature of pollutant distributions, in order to improve our
capability to predict pollution levels and to better quantify the influence
of these Asian inflows on the US west coast air quality. |
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