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| Titel |
Significant impact of the East Asia monsoon on ozone seasonal behavior in the boundary layer of Eastern China and the west Pacific region |
| VerfasserIn |
Y. J. He, I. Uno, Z. F. Wang, P. Pochanart, J. Li, H. Akimoto |
| 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. 24 ; Nr. 8, no. 24 (2008-12-17), S.7543-7555 |
| Datensatznummer |
250006517
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| Publikation (Nr.) |
 copernicus.org/acp-8-7543-2008.pdf |
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| Zusammenfassung |
| The impact of the East Asia monsoon on the seasonal behavior of O3 in
the boundary layer of Eastern China and the west Pacific region was analyzed
for 2004–2006 by means of full-year nested chemical transport model
simulations and continuous observational data obtained from three inland
mountain sites in central and eastern China and three oceanic sites in the
west Pacific region. The basic common features of O3 seasonal behaviors
over all the monitoring sites are the pre- and post-monsoon peaks with a
summer trough. Such bimodal seasonal patterns of O3 are predominant
over the region with strong summer monsoon penetration, and become weaker or
even disappear outside the monsoon region. The seasonal/geographical
distribution of the pre-defined monsoon index indicated that the East Asia
summer monsoon is responsible for the bimodal seasonal O3 pattern, and
also partly account for the differences in the O3 seasonal variations
between the inland mountain and oceanic sites. Over the inland mountain
sites, the O3 concentration increased gradually from the beginning of
the year, reached a maximum in June, decreased rapidly to the summer valley
in July or August, and then peaked in September or October, thereafter
decreased gradually again. Over the oceanic sites, O3 abundance showed
a similar increasing trend beginning in January, but then decreased
gradually from the end of March, followed by a wide trough with the minimum
in July and August and a small peak in October or November. A sensitivity
analysis performed by setting China-emission to zero revealed that the
chemically produced O3 from China-emission contributed substantially to
the O3 abundance, particularly the pre- and post-monsoon O3 peaks,
over China mainland. We found that China-emission contributed more than
40% to total boundary layer O3 during summertime (60–70% in July)
and accounted for about 40 ppb of each peak value over the inland region if
without considering the effect of the nonlinear chemical productions. In
contrast, over the oceanic region in the high monsoon index zone, the
contribution of China-emission to total boundary layer O3 was always
less than 20% (<10 ppb), and less than 10% in summer. |
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