Abstract:

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.

Key words: South Ocean