中国第26次南极科学考察航线上空水溶性气溶胶化学成分特征研究

利用我国第26次南极考察航线上所采集到的气溶胶样品,分析了各水溶性离子组分的浓度、组成及存在形式.采用多种数理统计方法对各离子成分特征及其来源进行了分析.结果显示:阴阳离子总和接近于1,表明航线上空主要阴阳离子具有海洋气溶胶的代表性;CI-、Na<'+>、SO<'2-><,4>、NO<'-><,3>、Mg<'2+>是航...

CHEMICAL COMPOSITION CHARACTERISTICS OF MARINE AEROSOLS COLLECTED ON THE ROUTE OF THE 26th CHINESE NATIONAL ANTARCTIC RESEARCH EXPEDITION

The various ions concentration, composition and existing form have been analyzed by the aerosol samplings collected during the 26th Chinese National Antarctic Research Expedition. The sources for all ions have been initially analyzed. The results showed that, the Cl-、Na+、SO42-、NO3-、Mg2+ were the uppermost ion components, and the (Na++Cl-) contributed to more than 70% for all ions, which showed that sea salt particle is the primary component of aerosols, and the secondary one is sulfate aerosol. We got the conclusion that the secondary aerosol of NH4+ existed as the form of NH4NO3、NH4HSO4、(NH4)2SO4 . According to the calculation, the anions and cations got a equilibrium relationship during the cruise, and the slope of linear regression was close to 1. The sea salt concentration got the peak at the south latitude of 40°S，and this may correlate with the wind speed ;And the MSA basically had the trend of increasing from the low latitude to high latitude, which may correlate with temperature and the summer emission of the algae in Southern Ocean; the secondary aerosol of NO3- and NH4+ were generally influenced by the distance from continental and the anthropogenic activity, while the nss-SO42- had low concentration at Open Ocean and Antarctic area, and the high concentration appeared at the adjacent sea. The sources of atmospheric soluble ions were distinguished from correlation analysis and factor analysis，it showed that Cl-、Br-、Na+、K+、Mg2+、Ca2+ came mostly from marine sources, F-、NO3-、NH4+ mostly from authropogenic sources and MSA mostly from marine biogenic activity sources. SO42- was meanwhile influenced by marine sources and anthropogenic sources, so the separation of ss-SO42- and nss-SO42- was of great importance.