CORRELATION OF BLACK CARBON AEROSOL AND CARBON MONOXIDE IN THE HIGH-ALTITUDE ENVIRONMENT OF MT. HUANG IN EASTERN CHINA

Xiaole Pan,Y. Kanaya,Zhaoyi Wang,Y. Liu,P. Pochanart,H. Akimoto,Yele Sun,Hua-bin Dong,J. Li,H. Irie,M. Takigawa

Published 2011 in Atmospheric Chemistry and Physics

ABSTRACT

Understanding the relationship between black car- bon (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 sta- tion 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 sea- son, implying the contribution from the large-scale domes- tic coal/biofuel combustion for heating. The BC-CO rela- tionship was found to show different seasonal features but strong positive correlation (R > 0.8). In Mt. Huang area, the 1BC/1CO ratio showed unimodal diurnal variations and had a maximum during the day (09:00-17:00 LST) and min- imum 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 tra- jectory cluster analysis showed that the 1BC/1CO 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 1BC/1CO 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 demon- strated that the 1BC/1CO ratio for biomass burning (BB) plumes were 10.3± 0.3 and 11.6± 0.5ng m 3 ppbv 1 , sig- nificantly higher than those during non-BB impacted peri- ods. The loss of BC during transport was also investigated on the basis of the 1BC/1CO-RH (relative humidity) rela- tionship along air mass pathways. The results showed that BC particles from Eastern China area was much more eas- ily removed from atmosphere than other inland regions due to the higher RH along transport pathway, implying the im- portance of chemical compositions and mixing states on BC residence time in the atmosphere.

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