THE PRELIMINARY ANALYSIS ON THE PRECIPITATION CHEMISTRY AT THE CHINA GREAT WALL STATION,ANTARCTIC IN 1998

This paper reports the analysis results(including pH,conductivity and ion concentrations)of the precipitation samples colected at the Great Wall Station of Antarctic(62°13'S,58°58'W,ASL 10.0m)in 1998.The average pH value and conductivity are 5.62 and 85.16 μS/cm,respectively.The pH value and conductivity of precipitation were higher during autumn,but lower during other seasons.The majorions in the precipitation are Cl- and Na+,fol owed by SO42-,Mg2+,Ca2+,K+,NO3-,NH4+ with the lower concentrations in order.The positive correlation significantly existing between the majorions except NO3-and NH4+ indicated that those majorions might come from the same sources.The fact that the proportions of ions in precipitation are extremely close to that of seawater of Antarctic Ocean may show that sea-salt originated aerosol is the dominant source of dissolvedions in precipitation.However,there is yet other sources which may contribute to Ca2+ ion in the precipitation.The precipitation at the area is characterized by marine type chemically.