【摘要】 对2003年7月15~9月28日间中国第二次北极科学考察沿线所采集的气溶胶样品进行分析,获得了Na+、NH+4、K+、Mg2+、Ca2+、Cl-、MSA、SO24-、NO-3、C2O24-和CH3COO-11种离子的浓度.离子组成表明,气溶胶主要以海盐颗粒为主,其中(Na++Cl-)的贡献平均为60.2%;其次为硫酸盐.根据因子分析,11种离子归为4个因子,解释方差为83.7%.因子1包括Na+、nss-Mg2+、nss-Ca2+、Cl-和nss-SO24-,代表陆地和海洋混合源,解释方差为41.2%;因子2包括NH+4、nss-K+和NO-3,来源于化石燃料燃烧和生物质燃烧所释放的二次污染物,解释方差为18.9%;因子3只有MSA,来源于海洋表层浮游植物排放的二甲基硫(DMS)的氧化,解释方差为11.9%;因子4包括CH3COO-和C2O24-,主要来源于高纬度的北温带北部森林大火,解释方差为11.6%.更多还原

【Abstract】 Aerosol samples were collected on the route of the Second Chinese National Arctic Research Expedition from July 15 to September 28,2003.The concentrations of water soluble ions(Na+、NH+4、K+、Mg2+、Ca2+、Cl-、MSA、SO2-4、NO-3、C2O24 and CH3COO-) were determined and analyzed to determine their sources.Marine aerosols were the dominant ions.Cl-and Na+ accounted for 60.2% of the total aerosol loading,followed by sulfate.The ions could be divided into four groups by factor analysis,accounting for 83.7% of the variance.Factor 1 included Na+、nss-Mg2+、nss-Ca2+、Cl-and nss-SO2-4,mainly from a mixture of sea salt and continental sources,and accounted for 41.2% of the variance;Factor 2(18.9%) included NH+4、nssK+ and NO-3,mostly from fossil fuel combustion,traffic emissions,and possibly biomass burning;Factor 3(11.9%) included MSA,only from oxidation of dimethylsulfide(DMS);Factor 4(11.6%) included CH3COO-and C2O2-4,mainly from biomass burning in boreal regions.更多还原