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| Titel |
Correlation of black carbon aerosol and carbon monoxide in the high-altitude environment of Mt. Huang in Eastern China |
| VerfasserIn |
X. L. Pan, Y. Kanaya, Z. F. Wang, Y. Liu, P. Pochanart, H. Akimoto, Y. L. Sun, H. B. Dong, J. Li, H. Irie, M. Takigawa |
| 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. 18 ; Nr. 11, no. 18 (2011-09-20), S.9735-9747 |
| Datensatznummer |
250010092
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| Publikation (Nr.) |
 copernicus.org/acp-11-9735-2011.pdf |
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| Zusammenfassung |
| Understanding the relationship between black carbon (BC) and carbon monoxide
(CO) will help improve BC emission inventories and the evaluation of
global/regional climate forcing effects. In the present work, the BC
(PM1) mass concentration and CO mixing ratio were continuously measured
at a high-altitude background station on the summit of Mt. Huang
(30.16° N, 118.26° E, 1840 m a.s.l.). Annual mean BC mass concentration was
1004.5 ± 895.5 ng m−3 with maxima in spring and autumn, and annual
mean CO mixing ratio was 424.1 ± 159.2 ppbv. A large increase of CO was
observed in the cold season, implying the contribution from the large-scale
domestic coal/biofuel combustion for heating. The BC-CO relationship was
found to show different seasonal features but strong positive correlation
(R>0.8). In Mt. Huang area, the ΔBC/ΔCO ratio showed
unimodal diurnal variations and had a maximum during the day (09:00–17:00
LST) and minimum at night (21:00–04:00 LST) in all seasons, indicating the
impact of planetary boundary layer and the intrusion of clean air masses
from the high troposphere. Back trajectory cluster analysis showed that the
ΔBC/ΔCO ratio of plumes from the Eastern China (Jiangsu,
Zhejiang provinces and Shanghai) was 8.8 ± 0.9 ng m−3 ppbv−1.
Transportation and industry were deemed as controlling factors of the BC-CO
relationship in this region. The ΔBC/ΔCO ratios for air
masses from Northern China (Anhui, Henan, Shanxi and Shandong provinces) and
southern China (Jiangxi, Fujian and Hunan provinces) were quite similar with
mean values of 6.5 ± 0.4 and 6.5 ± 0.2 ng m−3 ppbv−1
respectively. The case studies combined with satellite observations
demonstrated that the ΔBC/ΔCO ratio for biomass burning (BB)
plumes were 10.3 ± 0.3 and 11.6 ± 0.5ng m−3 ppbv−1, significantly
higher than those during non-BB impacted periods. The loss of BC during
transport was also investigated on the basis of the ΔBC/ΔCO-RH (relative humidity) relationship along air mass pathways. The
results showed that BC particles from Eastern China area was much more
easily removed from atmosphere than other inland regions due to the higher
RH along transport pathway, implying the importance of chemical compositions
and mixing states on BC residence time in the atmosphere. |
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