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Journal article

Correlation of black carbon aerosol and carbon monoxide in the high-altitude environment of Mt. Huang in Eastern China

Pan X, Kanaya Y, Wang Z, Liu Y, Pochanart P, Akimoto H, Sun Y, Dong H, Li J, Irie H, Takigawa M ...see all

Atmospheric Chemistry and Physics, vol. 11, issue 18 (2011) pp. 9735-9747

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Abstract

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 degrees N, 118.26 degrees E, 1840ma.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 Delta BC/Delta CO 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
Delta BC/Delta CO 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 Delta BC/Delta CO 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 Delta BC/Delta CO 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 Delta
BC/Delta 1CO-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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Authors

  • Qi ZhangUniversity of California - Davis

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  • X. L. Pan

  • Y. Kanaya

  • Z. F. Wang

  • Y. Liu

  • P. Pochanart

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