“雪龙号”2003北极航次气相多环芳烃纬度分布观测

OBSERVED LATITUDINAL DISTRIBUTION OF GASEOUS POLYCYCLIC AROMATIC HYDROCARBONS ABOARD XUELONG DURING CHINARE 2003

2003年“雪龙号”北极科学考察期间,对沿途海洋大气进行采样,分析其中气相多环芳烃的空间分布。结果显示,气相中主要是2—4环的多环芳烃,其中菲为主要的化合物,平均占到总多环芳烃的55.1%。在整个航程的广泛区域尺度内,气相总多环芳烃浓度在1043.9—92993.1pg/m3。空间分布上,远东亚的海面>北太平洋海面>北极圈以内海面;总多环芳烃的浓度随纬度升高呈现显著降低的趋势。通过Clausius-Clapeyron方程对浓度和温度相互关系的分析表明,温度是控制气相多环芳烃长距离传输的主要因素。

In the 2003 Chinese Arctic Research Expedition （CHINARE 2003） aboard the Xuelong, ocean air samples were collected to analyze gaseous polycyelic aromatic hydrocarbons （PAHs）. Only 2-4 ring PAHs were detected in gas phase, and phenanthrene was the most abundant with an average of 55.1% in total PAHs. The total concentration of 10 PAHs, EIoPAHs, ranged from 1043.9-92993.1 pg/m^3 during the transect. Spatial distribution showed a pattern of Fareast Asian〉 north Pacific Ocean 〉 the Arctic. Gaseous PAHs were decreased with the increasing latitudes. The relationship between concentrations and temperature by Clausius Clapeyron equation indicated that temperature was the main factor governing the transportation of gas-phase PAHs from mid-latitude area to the Arctic.