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| Titel |
Evaluating the influences of biomass burning during 2006 BASE-ASIA: a regional chemical transport modeling |
| VerfasserIn |
J. S. Fu, N. C. Hsu, Y. Gao, K. Huang, C. Li, N.-H. Lin, S.-C. Tsay |
| 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 ; 12, no. 9 ; Nr. 12, no. 9 (2012-05-02), S.3837-3855 |
| Datensatznummer |
250011107
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| Publikation (Nr.) |
 copernicus.org/acp-12-3837-2012.pdf |
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| Zusammenfassung |
To evaluate the impact of biomass burning from Southeast Asia to East Asia,
this study conducted numerical simulations during NASA's 2006
Biomass-burning Aerosols in South-East Asia: Smoke Impact Assessment
(BASE-ASIA). Two typical episode periods (27–28 March and 13–14 April) were
examined. Two emission inventories, FLAMBE and GFED, were used in the
simulations. The influences during two episodes in the source region
(Southeast Asia) contributed to the surface CO, O3 and PM2.5
concentrations as high as 400 ppbv, 20 ppbv and 80 μg m−3,
respectively. The perturbations with and without biomass burning of the
above three species during the intense episodes were in the range of 10 to
60%, 10 to 20% and 30 to 70%, respectively. The impact due to
long-range transport could spread over the southeastern parts of East Asia
and could reach about 160 to 360 ppbv, 8 to 18 ppbv and 8 to
64 μg m−3 on CO, O3 and PM2.5, respectively; the percentage
impact could reach 20 to 50% on CO, 10 to 30% on O3, and as high
as 70% on PM2.5. In March, the impact of biomass burning
mainly concentrated in Southeast Asia and southern China, while in April the
impact becomes slightly broader and even could go up to the Yangtze River
Delta region.
Two cross-sections at 15° N and 20° N were used to compare the
vertical flux of biomass burning. In the source region (Southeast Asia), CO,
O3 and PM2.5 concentrations had a strong upward transport from
surface to high altitudes. The eastward transport becomes strong from 2 to
8 km in the free troposphere. The subsidence process during the long-range
transport contributed 60 to 70%, 20 to 50%, and 80% on CO, O3
and PM2.5, respectively to surface in the downwind area. The study
reveals the significant impact of Southeastern Asia biomass burning on the
air quality in both local and downwind areas, particularly during biomass
burning episodes. This modeling study might provide constraints of lower
limit. An additional study is underway for an active biomass burning year to
obtain an upper limit and climate effects. |
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