Atmospheric polycyclic aromatic hydrocarbons observed over the North Pacific Ocean and the Arctic area:: Spatial distribution and source identification
Atmospheric polycyclic aromatic hydrocarbons observed over the North Pacific Ocean and the Arctic area:: Spatial distribution and source identification
复制标题
北太平洋和北极地区大气多环芳烃的空间分布和来源识别
DOI：
10.1016/j.atmosenv.2006.11.002
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发表时间：
2007-03-01
影响因子：
5
通讯作者：
Poeschl, Ulrich
中科院分区：
文献类型：
--
作者：
Ding, Xiang;Wang, Xin-Ming;Poeschl, Ulrich
2003年中国北极科考登上雪龙号破冰船从渤海到北极高原(北纬37-80度)，使用改装的大容量采样器采集空气样品，采样器通过石英过滤器和聚亚安酯泡沫塑料塞(PUF)吸入空气。这些过滤器和PUF分别在北太平洋和邻近的北极地区进行了颗粒相和气相多环芳烃(PAHs)的分析。西格玛多环芳烃(Sigma PAHs)(Sigma=15种化合物)的范围从无法检测到的颗粒相的4380pgm(-3)到气相的928-92600pgm(-3)。气相多环芳烃的纬度呈下降趋势，这可能是由于温度影响、稀释和分解过程所致；而颗粒相多环芳烃的纬度趋势较差，因为温度、稀释和光化学的影响在从中纬度源区到高纬度地区的不同区域起着不同的作用。海洋空气中多环芳烃的来源和化学老化可以用多环芳烃同分异构体对的比率来解释，这些异构体对在长途运输过程中是保守的或敏感的。在这项研究中，荧蒽/芘和吲哚[123-Cd]芘/苯并[gi]芘异构体对的比例保守到光降解，这表明生物质或燃煤可能是北太平洋和北极地区夏季观测到的多环芳烃的主要来源。对气团老化敏感的1，7/(1，7+2，6)-DMP(二甲基菲)和菲/菲的异构体比不仅暗示了北太平洋多环芳烃的化学演化与北极不同，而且揭示了北极多环芳烃主要与燃煤有关，生物质燃烧对北太平洋多环芳烃的贡献可能更大。(C)2006爱思唯尔有限公司。保留所有权利。
During the 2003 Chinese Arctic Research Expedition from the Bohai Sea to the high Arctic (37-80 degrees N) aboard the icebreaker Xuelong (Snow Dragon), air samples were collected using a modified high-volume sampler that pulls air through a quartz filter and a polyurethane foam plug (PUF). These filters and PUFs were analyzed for particulate phase and gas phase polycyclic aromatic hydrocarbons (PAHs), respectively, in the North Pacific Ocean and adjacent Arctic region. The Sigma PAHs (where Sigma = 15 compounds) ranged from undetectable level to 4380 pg m(-3) in the particulate phase and 928-92 600 pg m(-3) in the gas phase, respectively. A decreasing latitudinal trend was observed for gas-phase PAHs, probably resulting from temperature effects, dilution and decomposition processes; particulate-phase PAHs, however, showed poor latitudinal trends, because the effects of temperature, dilution and photochemistry played different roles in different regions from middle-latitude source areas to the high latitudes. The ratios of PAH isomer pairs, either conservative or sensitive to degradation during long-range transport, were employed to interpret sources and chemical aging of PAHs in ocean air. In this present study the fluoranthene/pyrene and indeno[123-cd]pyrene/benzo[ghi]pyrene isomer pairs, whose ratios are conservative to photo-degradation, implies that biomass or coal burning might be the major sources of PAHs observed over the North Pacific Ocean and the Arctic region in the summer. The isomer ratios of 1,7/(1,7+2,6)-DMP (dimethylphenanthrene) and anthracene/phenanthrene, which are sensitive to aging of air masses, not only imply chemical evolving of PAHs over the North Pacific Ocean were different from those over the Arctic, but reveal that PAHs over the Arctic were mainly related to coal burning, and biomass burning might have a larger contribution to the PAHs over the North pacific ocean. (c) 2006 Elsevier Ltd. All rights reserved.