Evolution of mixing state of black carbon particles: Aircraft measurements over the western Pacific in March 2004
Evolution of mixing state of black carbon particles: Aircraft measurements over the western Pacific in March 2004
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DOI：
10.1029/2006gl028943
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发表时间：
2007-06-02
影响因子：
5.2
通讯作者：
Koike, M.
中科院分区：
文献类型：
--
作者：
Moteki, N.;Kondo, Y.;Koike, M.
本文报道了用气载单颗粒烟尘光度计测量城市羽流中黑碳(BC)颗粒混合状态的演变。飞机观测于2004年3月在日本海岸附近的大洋上空进行。从日本名古屋市区排放出来的核心直径为180nmin.涂层的BC颗粒在12小时(H)内，即2.3%h(-1)内，其数量分数从0.35增加到0.63。核径为250 nm的BC颗粒以1.0%h(-1)的较慢速率增大。包衣BC颗粒的增加与非海盐硫酸盐和水溶性有机碳增加了约两倍，表明这些化合物对BC颗粒的包覆起到了作用。这些结果直接证明了城市羽流中BC颗粒在12h的时间尺度上发生了内部混合。
We report the evolution of the mixing state of black carbon ( BC) particles in urban plumes measured by an airborne single particle soot photometer. The aircraft observations were conducted over the ocean near the coast of Japan in March 2004. The number fraction of coated BC particles with a core diameter of 180 nmincreased from 0.35 to 0.63 within 12 hours ( h), namely 2.3% h(-1), after being emitted from the Nagoya urban area in Japan. BC particles with a core diameter of 250 nm increased at the slower rate of 1.0% h(-1). The increase in coated BC particles was associated with increases in non-sea salt sulfate and water-soluble organic carbon by a factor of approximately two, indicating that these compounds contributed to the coating on the BC particles. These results give direct evidence that BC particles become internally mixed on a time scale of 12 h in urban plumes.