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| Titel |
The relative importance of various source regions on East Asian surface ozone |
| VerfasserIn |
T. Nagashima, T. Ohara, K. Sudo, 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 ; 10, no. 22 ; Nr. 10, no. 22 (2010-11-30), S.11305-11322 |
| Datensatznummer |
250008923
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| Publikation (Nr.) |
 copernicus.org/acp-10-11305-2010.pdf |
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| Zusammenfassung |
| We estimated the source-receptor relationship for surface O3 in East
Asia during the early 2000s using a method that tags O3 tracers
according to their region of chemical production (tagged tracer method) with
a global chemical transport model. The estimation demonstrated the
importance of intracontinental transport of O3 inside East Asia as well
as of the transport of O3 from distant source regions. The model well
simulated the absolute concentration and seasonal variation of surface
O3 in East Asia and demonstrated significant seasonal differences in
the origin of surface O3. In the cold season (October to March), more
than half of surface O3 in East Asia is attributable to the O3
transported from distant sources outside of East Asia. In the warm season
(April to September), most of the surface O3 is attributable to O3
created within East Asia in most areas of East Asia. In spring the
contribution of domestically created O3 accounted for 20% of the
surface O3 in Japan and the Korean Peninsula, 40% in the North China
Plain, and around 50% in the southern part of China, and the domestic
contribution increased greatly in summer. The contributions of O3
created in China and the Korean Peninsula to O3 in Japan were estimated
at about 10% and 5%, respectively. We also demonstrated a large
contribution (20%) from China to the Korean Peninsula. In the northern
and southern parts of China, large contributions of over 10% from East
Siberia and the Indochina Peninsula, respectively, were identified. The
contribution from intercontinental transport increased with latitude; it was
21% in Northeast China and 13% in Japan and the Korean Peninsula in
spring. As for the hourly mean of surface O3, domestically created
O3 was the main contributor in most areas of East Asia, except for the
low O3 class (<30 ppbv), and accounted for more than 50% in the
very high O3 class (>90 ppbv). The mean relative contribution of
O3 created in China to O3 in central Japan was about 10% in
every class, but that created in the Korean Peninsula was significant in all
except the low O3 class. We identified the substantial impact of
foreign sources on Japan's ambient air quality standard in the high O3
class (60–90 ppbv) in spring. |
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