Long-range transport of polycyclic aromatic hydrocarbons (PAHs) from the eastern Asian continent to Kanazawa, Japan with Asian dust
Long-range transport of polycyclic aromatic hydrocarbons (PAHs) from the eastern Asian continent to Kanazawa, Japan with Asian dust
复制标题
DOI：
10.1016/j.atmosenv.2006.11.021
复制
发表时间：
2007-04
影响因子：
5
通讯作者：
S. Tamamura;Tsutomu Sato;Yukie Ota;Xilong Wang;N. Tang;K. Hayakawa
中科院分区：
文献类型：
--
作者：
S. Tamamura;Tsutomu Sato;Yukie Ota;Xilong Wang;N. Tang;K. Hayakawa
从2003年4月开始，在日本石川金泽的农村地区收集了为期一年的气溶胶颗粒，以了解亚洲沙尘作为多环芳烃(PAHs)长距离运输者的作用。本研究确定了三个采样周期，即：(1)沙尘期1(2003年3月11日-19日)；(2)沙尘期2(2003年3月28日-2003年4月9日)；(3)沙尘期3(2004年4月9日-4月25日)。亚洲沙尘主要分布在粗颗粒(2.1-11μm)范围内。多环芳烃分析分别在粗颗粒和细颗粒(<；1.1μm)范围内进行。粗颗粒物和细颗粒物中多环芳烃浓度的季节趋势表明，沙尘期3的亚洲沙尘颗粒中含有大量挥发性较低的多环芳烃，如苯并[a]芘(BaP)和苯并[g，h，i]并(BghiP)。这项研究中建立的动力学模型表明，由于这些多环芳烃的吸附速度非常慢，几乎不会在大气中的亚洲尘埃颗粒上积累。这些多环芳烃必须来自工业化地区周围受多环芳烃污染的土壤颗粒。回溯轨迹分析表明，沙尘暴3期的亚洲沙尘来自工业化地区附近的黄土地区。这表明地质物质在多环芳烃的大气环流中起着重要作用。
Aerosol particles were collected for 1 year, starting in April 2003, in rural areas of Kanazawa, Ishikawa, Japan to understand the role of Asian dust as a long-range transporter of polycyclic aromatic hydrocarbons (PAHs). Three sampling intervals were designated in this study, namely: (1) Dust period 1 (March 11–19, 2003); (2) Dust period 2 (March 28, 2003–April 9, 2003); and (3) Dust period 3 (April 9, 2004–April 25, 2004). The Asian dust particles are predominantly in the coarse particle size range (2.1–11μm). PAH analyses were performed separately on both the coarse and fine (<1.1μm) particle ranges. Seasonal trends in PAH concentrations for coarse and fine particles showed that the Asian dust particles in Dust period 3 contained significant amounts of less-volatile PAHs such as benzo[a]pyrene (BaP) and benzo[g,h,i]perylene (BghiP). A kinetic model developed in this study shows that almost none of these PAHs would be accumulated on Asian dust particles in the atmosphere, due to their extremely slow adsorption rates. These PAHs would have to originate from PAH-polluted soil particles around industrialized areas. Back trajectory analyses suggest that the Asian dust in Dust period 3 came from loess regions around industrialized areas. This indicates that geologic materials play a significant role in the atmospheric circulation of PAHs.